CN117634265B - Cylinder head unloading groove parameter determination method and related device - Google Patents

Abstract

The present application provides a method for determining the parameters of a cylinder head unloading groove and a related device, the method comprising: obtaining the size parameters of a target area in the cylinder head, the target area being an area where an unloading groove can be set; determining the target unloading groove parameters according to the size parameters of the target area and a target response surface calculation model, the fatigue times corresponding to the target unloading groove parameters meeting the preset requirements. The present application sets a target response surface calculation model, and performs calculations based on the size of the target area in the cylinder head where an unloading groove can be set, so as to quickly determine the target unloading groove parameters and improve the research and development speed.

Description

Cylinder head unloading groove parameter determination method and related device

Technical Field

The present application relates to the field of engines, and more specifically, to a method for determining parameters of a cylinder head unloading groove and a related device.

Background technique

The cylinder head of the engine is in a high temperature and high pressure working environment, and is prone to cracks due to fatigue damage, which in turn causes failures such as water leakage and cylinder scuffing, resulting in serious losses. In order to improve the structural strength of the cylinder head, a relief groove is machined between the two cylinders of the engine so that the thermal stress of the cylinder head bottom plate can be released to both sides, thereby extending the service life of the cylinder head.

In the prior art, although technicians have proposed a solution to set up a relief groove, they have not proposed a specific design method for the relief groove. The technicians set the size of the relief groove based on experience, including the length, width and depth of the relief groove. If the size design is unreasonable, the fatigue strength of the cylinder head may not meet the product requirements. Or the size design cannot reach the optimal level, resulting in a low fatigue life of the cylinder head and a high risk of cracks.

Summary of the invention

In view of this, the present application provides a method, device and electronic device for determining parameters of a cylinder head unloading groove, as follows:

A method for determining parameters of a cylinder head unloading groove comprises:

Obtaining size parameters of a target area in the cylinder head, where the target area is an area where a relief groove can be set;

According to the size parameters of the target area and the target response surface calculation model, the target unloading groove parameters are determined, and the fatigue times corresponding to the target unloading groove parameters meet the preset requirements.

Optionally, the above method, before determining the target unloading slot parameters according to the size parameters of the target area and the target response surface calculation model, further comprises:

Obtaining an initial response surface calculation model;

Determining the number of test parameter groups according to the initial response surface calculation model;

Determine a test parameter set according to the size parameter of the target area and the number of test parameter groups, wherein the test parameter set includes at least four groups of test parameters, and any two groups of test parameters include different sizes of the unloading groove;

Controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue times set, wherein the number of simulation fatigue times in the simulation fatigue times set corresponds to the number of test parameter groups in the test parameter set;

A target response surface calculation model is determined according to the set of simulation fatigue times and the set of test parameters.

Optionally, in the above method, the controlling the preset simulation model to simulate the test parameters of the test parameter set includes:

Setting cylinder head simulation environment information, wherein the cylinder head simulation environment information indicates that the cylinder head environment reaches a boundary condition;

Based on the cylinder head simulation environment information, the preset simulation model is controlled to simulate the test parameters of the test parameter set to obtain a set of simulated fatigue times.

Optionally, in the above method, the number of groups of test parameters in the test parameter set is greater than or equal to the number of coefficients to be determined, and determining the target response surface calculation model based on the simulation fatigue number set and the test parameter set includes:

According to a preset convergence rule, the test parameters in the test parameter set and the corresponding simulation fatigue number set are calculated with the initial response surface calculation model to obtain the target coefficient;

A target response surface calculation model is obtained according to the target coefficient and the initial response surface calculation model.

Optionally, the above method further includes:

Controlling a preset simulation model to simulate the target unloading slot parameters to obtain a target simulation fatigue number;

If the target simulation fatigue number is less than a preset threshold and/or the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, increase the number of test parameter groups, and return to execute the step of determining the test parameter set based on the size parameters of the target area and the number of test parameter groups.

Optionally, the above method further includes:

Controlling a preset simulation model to simulate the target unloading slot parameters to obtain a target simulation fatigue number;

If the target simulation fatigue number is less than a preset threshold and/or the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, the initial response surface calculation model is updated, the order of the updated initial response surface calculation model is greater than the order of the initial response surface calculation model before the update, and the process returns to execute the step of determining the number of test parameter groups based on the initial response surface calculation model.

Optionally, in the above method, obtaining the size parameters of the target area in the cylinder head includes:

Based on the first target bolt position and the second target bolt position, obtaining a first distance, wherein the first distance corresponds to a length of the unloading groove;

A second distance is obtained based on the positions of the two cylinder sealing bands on the cylinder head gasket, wherein the second distance corresponds to the width of the unloading groove;

Based on the cylinder head thickness, a third distance is obtained, which corresponds to the depth of the relief groove.

A cylinder head unloading groove parameter determination device, comprising:

An acquisition module, used for acquiring the size parameters of a target area in the cylinder head, wherein the target area is an area where a relief groove can be set;

The determination module is used to determine the target unloading groove parameters according to the size parameters of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameters meet the preset requirements.

An electronic device, comprising:

Memory, processor;

Wherein, the memory stores a processing program;

The processor is used to load and execute the processing program stored in the memory to implement each step of the cylinder head unloading groove parameter determination method as described in any one of the above items.

A readable storage medium stores a computer program, wherein the computer program is called and executed by a processor to implement the steps of the cylinder head unloading groove parameter determination method as described in any one of the above items.

In summary, the present application provides a method for determining the parameters of a cylinder head unloading groove and a related device, the method comprising: obtaining the size parameters of a target area in the cylinder head, the target area being an area where the unloading groove can be set; determining the target unloading groove parameters according to the size parameters of the target area and a target response surface calculation model, the fatigue times corresponding to the target unloading groove parameters meeting the preset requirements. In this embodiment, a target response surface calculation model is set, and calculation is performed based on the size of the target area in the cylinder head where the unloading groove can be set, so that the target unloading groove parameters can be quickly determined, thereby improving the research and development speed.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work.

FIG1 is a flow chart of a cylinder head unloading groove parameter determination method embodiment 1 provided by the present application;

FIG2 is a flow chart of a cylinder head unloading groove parameter determination method embodiment 2 provided by the present application;

FIG3 is a flow chart of a cylinder head unloading groove parameter determination method embodiment 3 provided by the present application;

FIG4 is a flow chart of a cylinder head unloading groove parameter determination method embodiment 4 provided by the present application;

FIG5 is a flow chart of a cylinder head unloading groove parameter determination method embodiment 5 provided by the present application;

FIG6 is a flow chart of a cylinder head unloading groove parameter determination method embodiment 6 provided by the present application;

FIG7 is a schematic diagram of a cylinder head in Embodiment 6 of a method for determining parameters of a cylinder head unloading groove provided by the present application;

FIG8 is a cross-sectional schematic diagram of a cylinder head in Embodiment 6 of a method for determining parameters of a cylinder head unloading groove provided by the present application;

FIG9 is a schematic structural diagram of an embodiment of a cylinder head unloading groove parameter determination device provided in the present application.

Detailed ways

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

As shown in FIG. 1 , it is a flow chart of Embodiment 1 of a method for determining parameters of a cylinder head unloading groove provided by the present application. The method is applied to an electronic device, and the method comprises the following steps:

Step S101: obtaining size parameters of a target area in a cylinder head, where the target area is an area where a relief groove can be set;

Wherein, a relief groove can be provided in a target area in the cylinder head.

Wherein, the size parameters of the target area in the cylinder head are obtained.

Specifically, the target area is an area where a relief groove is provided in the cylinder head and a reasonable wall thickness is left between the cylinder head and other structures.

For example, the depth of the target area needs to ensure that the unloading groove and the water jacket and oil channel inside the cylinder head have a reasonable wall thickness.

The size parameters of the target area will be described in detail in the subsequent embodiments, which will not be described in detail in this embodiment.

Step S102: determining target unloading groove parameters according to the size parameters of the target area and the target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameters meet preset requirements.

Among them, a target response surface calculation model is preset in the electronic device.

The size of the target area is the upper limit of the length, width and height of the unloading groove.

Correspondingly, based on the size parameters of the target area and the target response surface calculation model, the target unloading slot parameters are obtained by analysis and calculation based on the calculation model.

The fatigue times corresponding to the target unloading slot parameters meet preset requirements, and the preset requirements are specifically the maximum fatigue times determined by the target response surface calculation model.

The target response surface calculation model is a calculation formula model. By using the calculation formula model for analysis and calculation, a large number of tests can be quickly carried out based on the size parameters of the target area.

Specifically, the response surface calculation model is determined by selecting a suitable optimization algorithm, and specifically, an optimization calculation is performed based on the optimization algorithm, with the size parameters of the target area as the boundary and the maximum number of fatigue times obtained by the response surface model as the target for iterative calculation, and the fatigue times are required to meet preset requirements.

Optionally, the optimization algorithm may use a genetic algorithm.

Among them, the target unloading slot parameters corresponding to the maximum fatigue times are the current optimal setting parameters.

Since the calculation process of the calculation formula model is very fast compared to the speed of the simulation, the target unloading tank parameters can be quickly determined.

In summary, the present embodiment provides a method for determining the parameters of a cylinder head unloading groove, comprising: obtaining the size parameters of a target area in the cylinder head, the target area being an area where the unloading groove can be set; determining the target unloading groove parameters according to the size parameters of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameters meet preset requirements. In the present embodiment, a target response surface calculation model is set, and calculation is performed based on the size of the target area in the cylinder head where the unloading groove can be set, so that the target unloading groove parameters can be determined quickly, thereby improving the research and development speed.

As shown in FIG. 2 , it is a flow chart of Embodiment 2 of a method for determining parameters of a cylinder head unloading groove provided by the present application. The method comprises the following steps:

Step S201: obtaining size parameters of a target area in a cylinder head, where the target area is an area where a relief groove can be set;

Among them, step S201 is consistent with the corresponding step in Example 1 and is not described in detail in this embodiment.

Step S202: obtaining an initial response surface calculation model;

Among them, technicians select the initial response surface calculation model according to actual conditions.

The initial response surface calculation model can be selected as first order or second order.

The parameters in the initial response surface calculation model are not determined, and this embodiment describes the process of determining the parameters to obtain the target response surface calculation model.

The initial response surface calculation model is designed with the length, width and depth of the unloading groove as factors and the fatigue strength of the cylinder head as the target.

For example, the first-order initial response surface calculation model is as follows:

Among them, λ represents the fatigue strength of the cylinder head, β is the unknown coefficient, and _Ki represents the three factors of length L, width W and height H respectively.

There are four undetermined coefficients in this model, β ₀ , β ₁ , β ₂ and β ₃ .

Step S203: determining the number of test parameter groups according to the initial response surface calculation model;

The number of test parameter groups is determined according to the number of undetermined coefficients in the initial response surface calculation model.

In order to solve the undetermined coefficients in the initial response surface calculation model, multiple test parameters need to be set.

For example, if the number of undetermined coefficients is 4, at least 4 groups of test parameters need to be set.

Step S204: determining a test parameter set according to the size parameter of the target area and the number of test parameter groups;

The test parameter set includes at least four groups of test parameters, and any two groups of test parameters include different sizes of the unloading groove.

Among them, a set of test parameters includes three values: the length, width and height of the unloading groove.

The size parameter of the target area is the upper limit value of the length, width and height of the unloading groove in the test parameters. Within the range of the upper limit value, multiple groups of test parameters are selected.

According to the number of test parameter groups determined in the aforementioned steps, a corresponding number of test parameters are determined within the size parameter range of the target area, and the size of the unloading slot in each group of test parameters is different.

Step S205: controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a set of simulated fatigue times;

The number of simulation fatigue times in the simulation fatigue times set corresponds to the number of test parameter groups in the test parameter set.

The preset simulation model is a pre-built cylinder head finite element model, through which the test parameters are simulated.

Specifically, the preset simulation model is controlled to simulate each group of test parameters to obtain a simulated fatigue number, and each simulated fatigue number is combined to obtain a simulated fatigue number set.

Among them, one simulation fatigue number corresponds to a set of test parameters.

Specifically, step S205 includes:

Step S2051: setting cylinder head simulation environment information, wherein the cylinder head simulation environment information indicates that the cylinder head environment reaches a boundary condition;

The simulation environment information simulates the environment of the cylinder head when the engine is running.

Specifically, referring to the actual operating spectrum of the engine, the boundary condition when the cylinder head temperature is the highest is introduced. This boundary condition is a harsh operating condition of the engine. Under this operating condition, the thermal stress of the cylinder head is the largest and the number of low-cycle fatigue is the smallest.

Step S2052: Based on the cylinder head simulation environment information, control the preset simulation model to simulate the test parameters of the test parameter set to obtain a set of simulated fatigue times.

Among them, based on the cylinder head simulation environment, the simulation model is controlled to simulate each group of test parameters in the test parameter set, thereby realizing simulation under harsh working conditions.

Step S206: determining a target response surface calculation model according to the simulation fatigue times set and the test parameter set;

Among them, based on the simulated fatigue number set and the test parameter set obtained by simulation, the two sets of data are brought into the initial response surface calculation model to obtain the model coefficients and determine the target response surface calculation model.

Among them, if the number of test parameter groups in the test parameter set is the same as the number of model coefficients, the value of the coefficient can be directly calculated, and the coefficient can be brought into the initial response surface calculation model to obtain the target response surface calculation model.

Among them, if the number of test parameter groups in the test parameter set is greater than the number of model coefficients, further processing is required to obtain the target response surface calculation model. This situation is described in detail in the subsequent embodiments and will not be described in detail in this embodiment.

Step S207: Determine target unloading groove parameters according to the size parameters of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameters meet the preset requirements.

Among them, step S207 is consistent with the corresponding step in Example 1 and is not described in detail in this embodiment.

In summary, the cylinder head unloading groove parameter determination method provided in the present embodiment also includes: obtaining an initial response surface calculation model; determining the number of test parameter groups based on the initial response surface calculation model; determining a test parameter set based on the size parameters of the target area and the number of test parameter groups, wherein the test parameter set includes at least four groups of test parameters, and any two groups of test parameters include different sizes of the unloading groove; controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue times set, wherein the number of simulation fatigue times in the simulation fatigue times set corresponds to the number of test parameter groups in the test parameter set; determining a target response surface calculation model based on the simulation fatigue times set and the test parameter set. In the present embodiment, based on a limited number of simulations of the test parameters, a simulation fatigue times set is obtained, and then the target response surface calculation model can be determined based on the simulation fatigue times set and the test parameter set, and the process of determining the target response surface calculation model is clarified.

As shown in FIG. 3 , it is a flow chart of Embodiment 3 of a method for determining parameters of a cylinder head unloading groove provided by the present application. The method comprises the following steps:

Step S301: obtaining size parameters of a target area in a cylinder head, where the target area is an area where a relief groove can be set;

Step S302: obtaining an initial response surface calculation model;

Step S303: determining the number of test parameter groups according to the initial response surface calculation model;

Step S304: determining a test parameter set according to the size parameter of the target area and the number of test parameter groups;

Step S305: controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a set of simulated fatigue times;

Among them, steps S301-305 are consistent with the corresponding steps in Example 2 and are not described in detail in this embodiment.

Step S306: according to a preset fitting rule, the test parameters in the test parameter set and the corresponding simulation fatigue times set are respectively calculated with the initial response surface calculation model to obtain the target coefficient;

The number of groups of test parameters in the test parameter set is greater than or equal to the number of undetermined coefficients in the initial response surface calculation model.

Among them, if the number of groups of the test parameters is equal to the number of undetermined coefficients in the initial response surface calculation model, the test parameters are used as input values and the corresponding simulation fatigue times are used as output values, and are substituted into the initial response surface calculation model to obtain multiple formulas containing undetermined coefficients. Based on the calculation of these multiple formulas, the values of each undetermined coefficient can be obtained.

Among them, the number of test parameters in the test parameter set will be greater than the number of undetermined coefficients in the initial response surface calculation model. It is necessary to adopt a fitting rule to determine a set of values of undetermined coefficients by combining the test parameters, the corresponding fatigue simulation times and the initial response surface calculation model. The values of the undetermined coefficients can minimize the sum of squares of the errors between the predicted fatigue times corresponding to each set of test parameters and the corresponding simulated fatigue times. The values of the undetermined coefficients are taken as the target coefficients.

For example, the initial response surface calculation model adopts a first-order formula, the test parameters are the length L, width W and height H of the unloading groove, and the corresponding simulation fatigue number is λ. This set of data is brought into the initial response surface calculation model to obtain multiple sets of equations. The multiple sets of equations are solved to obtain the values of the unknown coefficients β ₀ , β ₁ , β ₂ and β ₃ .

Step S307: obtaining a target response surface calculation model according to the target coefficient and the initial response surface calculation model;

The target coefficients with determined values are used to replace the undetermined coefficients in the initial response surface calculation model to obtain the target response surface calculation model.

Among them, since the prediction results of the target response surface calculation model can be as close as possible to the simulation results of the preset simulation model, it can ensure that the results predicted by the target response surface calculation model are almost consistent with the simulation results. However, the time required for calculation using the target response surface calculation model is much less than the simulation time, which reduces the time spent on determining the target unloading tank parameters.

Step S308: Determine target unloading groove parameters according to the size parameters of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameters meet the preset requirements.

Among them, step S308 is consistent with the corresponding step in Example 2 and is not described in detail in this embodiment.

In summary, the present embodiment provides a method for determining the parameters of the cylinder head unloading groove, wherein the number of groups of test parameters in the test parameter set is greater than or equal to the number of coefficients to be determined, and the method comprises: according to a preset convergence rule, the test parameters in the test parameter set and the corresponding set of simulated fatigue times are respectively calculated with the initial response surface calculation model to obtain the target coefficient; according to the target coefficient and the initial response surface calculation model, the target response surface calculation model is obtained. In the present embodiment, the target response surface calculation model can be obtained based on mathematical calculation, and the process is simple and easy.

As shown in FIG. 4 , it is a flow chart of Embodiment 4 of a method for determining parameters of a cylinder head unloading groove provided by the present application. The method comprises the following steps:

Step S401: obtaining size parameters of a target area in a cylinder head, where the target area is an area where a relief groove can be set;

Step S402: obtaining an initial response surface calculation model;

Step S403: determining the number of test parameter groups according to the initial response surface calculation model;

Step S404: determining a test parameter set according to the size parameter of the target area and the number of test parameter groups;

Step S405: controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a set of simulated fatigue times;

Step S406: determining a target response surface calculation model according to the set of simulation fatigue times and the set of test parameters;

Step S407: determining target unloading tank parameters according to the size parameters of the target area and the target response surface calculation model;

Among them, steps S401-407 are consistent with the corresponding steps in Example 2 and are not described in detail in this embodiment.

Step S408: controlling a preset simulation model to simulate the target unloading slot parameters to obtain a target simulation fatigue number;

Among them, after determining the target unloading tank parameters, since the prediction results of the target response surface calculation model may be different from the simulation results of the preset simulation model, in this embodiment, it is further determined whether the target unloading tank parameters are optimal parameters based on the preset simulation model.

Specifically, the preset simulation model is controlled to simulate the target unloading slot parameters to obtain the target simulation fatigue times.

The preset threshold may be an empirical value, specifically a set empirical fatigue count, or may be a lower limit of the fatigue count of the cylinder head.

Among them, the target simulation fatigue number is compared with a preset threshold. If the target simulation fatigue number is greater than the preset threshold, it indicates that the fatigue number that can be achieved by setting the target unloading groove parameters of the cylinder head is greater than the lower limit of the fatigue number.

Among them, the target simulation fatigue number is compared with each simulation fatigue number in the simulation fatigue number set in the previous step. If the target simulation fatigue number is greater than each simulation fatigue number in the simulation fatigue number set, it can be determined that the target unloading slot parameter is the current optimal parameter.

Step S409: if the target simulation fatigue number is less than a preset threshold and/or the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, increase the number of test parameter groups;

And return to execute step S404.

Among them, if the target simulation fatigue number is less than the preset threshold, indicating that the fatigue number reached by setting the unloading groove parameters of the cylinder head is less than the lower limit of the fatigue number, then the target unloading groove parameters calculated by the target response surface calculation model are not optimal parameters.

Among them, if the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, it means that the fatigue number achieved by setting the unloading groove parameters of the cylinder head is not the largest, and the target unloading groove parameters calculated by the target response surface calculation model are not optimal parameters.

Specifically, if the target unloading tank parameters calculated by the target response surface calculation model are not optimal parameters, it indicates that the target response surface calculation model has a large error and needs to be further optimized.

Specifically, the number of test parameter groups is increased so as to reduce the error between the target response surface calculation model and the preset simulation model.

Specifically, the error between the target response surface calculation model and the preset simulation model can be reduced by referring to the process in the aforementioned embodiment 4, which will not be described in detail in this embodiment.

In summary, the cylinder head unloading groove parameter determination method provided in the present embodiment also includes: controlling the preset simulation model to simulate the target unloading groove parameter to obtain the target simulation fatigue number; if the target simulation fatigue number is less than the preset threshold and/or the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, increasing the number of test parameter groups, and returning to execute the step of determining the test parameter set based on the size parameters of the target area and the number of test parameter groups. In the present embodiment, the preset simulation model is also controlled to simulate the target unloading groove parameter to determine the prediction accuracy of the target response surface calculation model. If the target simulation fatigue number of the target unloading groove parameter is less than the preset threshold and/or less than any fatigue number in the simulation fatigue number set, it is determined that the prediction accuracy of the target response surface calculation model is low, and the target unloading groove parameter is not the optimal position. The target response surface calculation model is parameter optimized to determine the target unloading groove parameter based on the optimized target response surface calculation model to improve the accuracy of the prediction result.

As shown in FIG. 5 , it is a flow chart of Embodiment 5 of a method for determining parameters of a cylinder head unloading groove provided by the present application. The method comprises the following steps:

Step S501: obtaining size parameters of a target area in a cylinder head, where the target area is an area where a relief groove can be set;

Step S502: obtaining an initial response surface calculation model;

Step S503: determining the number of test parameter groups according to the initial response surface calculation model;

Step S504: determining a test parameter set according to the size parameter of the target area and the number of test parameter groups;

Step S505: controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a set of simulated fatigue times;

Step S506: determining a target response surface calculation model according to the simulation fatigue times set and the test parameter set;

Step S507: determining target unloading slot parameters according to the size parameters of the target area and the target response surface calculation model;

Among them, steps S501-507 are consistent with the corresponding steps in Example 2 and are not described in detail in this embodiment.

Step S508: controlling a preset simulation model to simulate the target unloading slot parameters to obtain a target simulation fatigue number;

For the explanation of step S508, please refer to the corresponding steps in Example 4, which will not be described in detail in this embodiment.

Step S509: if the target simulation fatigue number is less than a preset threshold and/or the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, updating the initial response surface calculation model, and the order of the updated initial response surface calculation model is greater than the order of the initial response surface calculation model before the update;

And return to execute step S503.

Among them, if the target simulation fatigue number is less than the preset threshold, indicating that the fatigue number reached by setting the unloading groove parameters of the cylinder head is less than the lower limit of the fatigue number, then the target unloading groove parameters calculated by the target response surface calculation model are not optimal parameters.

Among them, if the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, it means that the fatigue number achieved by setting the unloading groove parameters of the cylinder head is not the largest, and the target unloading groove parameters calculated by the target response surface calculation model are not optimal parameters.

Specifically, if the target unloading tank parameters calculated by the target response surface calculation model are not optimal parameters, it indicates that the target response surface calculation model has a large error and needs to be further optimized.

Specifically, the initial response surface calculation model is updated and the order of the calculation model is increased so as to reduce the error between the target response surface calculation model and the preset simulation model.

Among them, the higher the order of the calculation model, the more undetermined coefficients it involves, and therefore the more test parameter groups are required. Correspondingly, the more simulation times and calculation times are, the more accurate the response surface calculation model is.

For example, the first-order initial response surface calculation model is updated to the second-order initial response surface calculation model.

The second-order initial response surface calculation model is as follows:

Among them, λ represents the fatigue strength of the cylinder head, β is the unknown coefficient, and _Ki and _Kj represent the three factors of length L, width W and height H respectively.

Among them, there are 10 unknown coefficients in this model, namely β ₀ , β ₁ , β ₂ , β ₃ , β ₁₁ , β ₁₂ , β ₁₃ , β ₂₂ , β ₂₃ , and β ₃₃ .

After the high-order initial response surface calculation model is determined, the process returns to step S602 to determine the coefficients of the high-order initial response surface calculation model, and then determines a new target response surface calculation model to reduce the error between the target response surface calculation model and the preset simulation model.

In summary, the present embodiment provides a method for determining the parameters of the cylinder head unloading groove, further comprising: controlling the preset simulation model to simulate the target unloading groove parameters to obtain the target simulation fatigue times; if the target simulation fatigue times are less than the preset threshold and/or the target simulation fatigue times are less than any simulation fatigue times in the simulation fatigue times set, updating the initial response surface calculation model, the order of the updated initial response surface calculation model is greater than the order of the initial response surface calculation model before the update, and returning to execute the step of determining the number of test parameter groups according to the initial response surface calculation model. In the present embodiment, the preset simulation model is also controlled to simulate the target unloading groove parameters to determine the prediction accuracy of the target response surface calculation model. If the target simulation fatigue times of the target unloading groove parameters are less than the preset threshold and/or less than any fatigue times in the simulation fatigue times set, it is determined that the prediction accuracy of the target response surface calculation model is low, and the target unloading groove parameters are not in the optimal position, a higher-order initial response surface model is selected, and the parameters of the initial response surface model are re-determined to optimize the response surface model, so as to determine the target unloading groove parameters based on the optimized response surface model, so as to improve the accuracy of the prediction results.

As shown in FIG. 6 , it is a flow chart of Embodiment 6 of a method for determining parameters of a cylinder head unloading groove provided by the present application. The method comprises the following steps:

Step S601: obtaining a first distance based on the first target bolt and the second target bolt positions, wherein the first distance corresponds to the length of the unloading groove;

Among them, based on the size of each structure on the cylinder head, the size parameters of its target area are determined.

Among them, two bolts, a first target bolt and a second target bolt, are respectively arranged inside the water inlet hole and the water outlet hole of the cylinder cover.

Specifically, based on the positions of the first target bolt and the second target bolt, a first distance is obtained. The first distance is specifically the distance between the two target bolts minus the necessary reasonable wall thickness.

The first distance corresponds to the length of the unloading groove, and when determining the test parameters later, the test unloading groove length is selected within the range of the first distance.

Specifically, a plurality of unloading groove length values may be selected in sequence according to the set first gradient.

Step S602: obtaining a second distance based on the positions of the two cylinder sealing bands on the cylinder head gasket, wherein the second distance corresponds to the width of the unloading groove;

A second distance is obtained between the two cylinder sealing bands on the cylinder head gasket, and the second distance is specifically the distance between the two cylinder sealing bands on the cylinder head gasket minus the necessary reasonable wall thickness.

The second distance corresponds to the unloading groove width, and when determining the test parameters later, the test unloading groove width is selected within the second distance range.

Specifically, a plurality of unloading groove width values may be selected in sequence according to the set second gradient.

Step S603: based on the cylinder head thickness, obtaining a third distance, wherein the third distance corresponds to the depth of the unloading groove;

Among them, the cylinder head thickness is the upper limit of the unloading groove depth, and the unloading groove depth cannot exceed the cylinder head thickness.

Specifically, the depth of the unloading groove is related to the processing technology. Generally, the greater the width, the greater the processing depth. When it is the deepest, it should ensure that a reasonable wall thickness is left between the unloading groove and the water jacket and oil channel inside the cylinder head.

FIG7 is a bottom view of the cylinder head, and FIG8 is a cross-sectional view of the A-A section in FIG7. Please combine FIG7 and FIG8, the cylinder head includes: cylinder head 1, cylinder head bottom surface 2, exhaust valve hole 3, intake valve hole 4, spark plug hole 5, cylinder head bolt hole 6, nose bridge area 7, cylinder head water inlet hole 8, cylinder head water outlet hole 9, cylinder head oil return hole 10, and inter-cylinder unloading groove 11. Among them, L represents the unloading groove length, W represents the unloading groove width, and H represents the unloading groove depth.

Among them, the cylinder head 1, the engine body and the piston form the combustion chamber of the engine. The combustion of the gas in the combustion chamber generates high-temperature and high-pressure gas, which acts on the bottom surface 2 of the cylinder head, causing large thermal stress on the bottom surface of the cylinder head. There are exhaust valve holes 3 and intake valve holes 4 on the bottom surface 2 of the cylinder head, which are connected to the exhaust duct and intake duct of the cylinder head respectively. In the middle of the exhaust valve hole 3 and the intake valve hole 4, a spark plug hole 5 is provided for installing the spark plug. The existence of the exhaust valve hole 3, the intake valve hole 4 and the spark plug hole 5 makes the rigidity of each part of the bottom surface of the cylinder head different. When the bottom surface 2 of the cylinder head is deformed due to heat, stress concentration is likely to occur at the middle connection position of each valve hole, that is, the nose bridge area 7. If the stress cannot be effectively released, fatigue cracks are likely to occur. There are multiple cylinder head bolt holes 6 on the outside of each valve hole, and the cylinder head bolts pass through the cylinder head bolt holes 6 to connect the cylinder head 1 to the engine body. In order to reduce the temperature of the bottom surface 2 of the cylinder head, the cylinder head 1 is also provided with a cylinder head water inlet hole 8 and a cylinder head water outlet hole 9. Cooling water flows inside the cylinder head 1 through the water holes to cool the cylinder head. A cylinder head oil return hole 10 is also provided on the outside of the cylinder head. The oil in the cylinder head cover flows back to the engine oil pan through the cylinder head oil return hole 10. An inter-cylinder unloading groove 11 is provided in the middle connection area of each cylinder of the cylinder head. Through the deformation of the inter-cylinder unloading groove 11, the thermal stress of the nose bridge area 7 is released, reducing the risk of cylinder head cracks.

Step S604: Determine target unloading groove parameters according to the size parameters of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameters meet the preset requirements.

Among them, step S704 is consistent with the corresponding step in Example 1 and is not described in detail in this embodiment.

In summary, the present embodiment provides a method for determining the parameters of the cylinder head unloading groove, including: obtaining a first distance based on the first target bolt and the second target bolt positions, the first distance corresponding to the length of the unloading groove; obtaining a second distance based on the positions of the two cylinder sealing bands on the cylinder head gasket, the second distance corresponding to the width of the unloading groove; obtaining a third distance based on the cylinder head thickness, the third distance corresponding to the depth of the unloading groove. In the present embodiment, the target area parameters in the cylinder head are determined according to the specific structure of the cylinder head, providing a basis for the subsequent target response surface calculation model to calculate the target unloading groove parameters.

Corresponding to the above-mentioned embodiment of a method for determining parameters of a cylinder head unloading groove provided by the present application, the present application also provides an embodiment of a device applying the method for determining parameters of a cylinder head unloading groove.

FIG9 is a schematic diagram of a cylinder head unloading groove parameter determination device embodiment provided by the present application, the device includes the following structures: an acquisition module 901 and a determination module 902;

Wherein, the obtaining module 901 is used to obtain the size parameters of the target area in the cylinder head, where the target area is an area where the unloading groove can be set;

The determination module 902 is used to determine the target unloading groove parameters according to the size parameters of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameters meet the preset requirements.

Optionally, before obtaining the target unloading slot parameters according to the size parameters of the target area and the preset response surface calculation model, the method further includes:

A model acquisition module is used to obtain an initial response surface calculation model;

A group number determination module is used to determine the number of test parameter groups according to the initial response surface calculation model;

A test parameter determination module, used to determine a test parameter set according to the size parameter of the target area and the number of test parameter groups, wherein the test parameter set includes at least four groups of test parameters, and any two groups of test parameters include different sizes of unloading slots;

A control module, used for controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue times set, wherein the number of simulation fatigue times in the simulation fatigue times set corresponds to the number of test parameter groups in the test parameter set;

The model determination module is used to determine the target response surface calculation model according to the simulation fatigue number set and the test parameter set.

Optionally, the control module is specifically used to:

Setting cylinder head simulation environment information, wherein the cylinder head simulation environment information indicates that the cylinder head environment reaches a boundary condition;

Based on the cylinder head simulation environment information, the preset simulation model is controlled to simulate the test parameters of the test parameter set to obtain a set of simulated fatigue times.

Optionally, a model determination module is used to:

Obtaining a first coefficient according to the set of simulated fatigue times, the set of test parameters, and the initial response surface calculation model;

A target response surface calculation model is obtained according to the first coefficient and the initial response surface calculation model.

Optionally, the model determination module is also used to:

Based on the number of groups of test parameters in the test parameter set being greater than the number of the first coefficient, a set of predicted fatigue times is obtained according to the test parameters in the test parameter set and the target response surface calculation model;

Obtaining a second coefficient according to the predicted fatigue times set and the simulated fatigue times set;

The first coefficients of the target response surface calculation model are updated based on the second coefficients.

Optionally, the control module is also used to:

Controlling a preset simulation model to simulate the target unloading slot parameters to obtain a target simulation fatigue number;

If the target simulation fatigue times is less than a preset threshold and/or the target simulation fatigue times is less than any simulation fatigue times in the simulation fatigue times set, the number of test parameter groups is increased, and the trigger test parameter determination module is returned.

Optionally, the control module is also used to:

Controlling a preset simulation model to simulate the target unloading slot parameters to obtain a target simulation fatigue number;

If the target simulation fatigue number is less than a preset threshold and/or the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, the initial response surface calculation model is updated, the order of the updated initial response surface calculation model is greater than the order of the initial response surface calculation model before the update, and the trigger group number determination module is returned.

Optionally, obtain the module, specifically for:

Based on the first target bolt position and the second target bolt position, obtaining a first distance, wherein the first distance corresponds to a length of the unloading groove;

A second distance is obtained based on the positions of the two cylinder sealing bands on the cylinder head gasket, wherein the second distance corresponds to the width of the unloading groove;

Based on the cylinder head thickness, a third distance is obtained, which corresponds to the depth of the relief groove.

It should be noted that, for the functional explanation of each component structure in the cylinder head unloading groove parameter determination device embodiment provided in this embodiment, please refer to the explanation in the aforementioned method embodiment, and it will not be repeated in this embodiment.

In summary, the cylinder head unloading groove parameter determination device provided in this embodiment includes: an acquisition module for obtaining the size parameters of a target area in the cylinder head, the target area being an area where the unloading groove can be set; a determination module for determining the target unloading groove parameters based on the size parameters of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameters meet the preset requirements. In this embodiment, the target response surface calculation model is set, and the calculation is performed based on the size of the target area in the cylinder head where the unloading groove can be set, so that the target unloading groove parameters can be quickly determined, thereby improving the research and development speed.

Corresponding to the above-mentioned embodiment of a method for determining parameters of a cylinder head unloading groove provided by the present application, the present application also provides electronic equipment and a readable storage medium corresponding to the method for determining parameters of a cylinder head unloading groove.

The electronic device includes: a memory and a processor;

Wherein, the memory stores a processing program;

The processor is used to load and execute the processing program stored in the memory to implement each step of the cylinder head unloading groove parameter determination method as described in any one of the above items.

For the specific implementation of the cylinder head unloading groove parameter determination method of the electronic device, reference may be made to the aforementioned cylinder head unloading groove parameter determination method embodiment.

The readable storage medium stores a computer program thereon, and the computer program is called and executed by a processor to implement the steps of the cylinder head unloading groove parameter determination method as described in any one of the above items.

Specifically, the computer program stored in the readable storage medium is executed to implement the cylinder head unloading groove parameter determination method, and reference may be made to the aforementioned cylinder head unloading groove parameter determination method embodiment.

In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device provided in the embodiment, since it corresponds to the method provided in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

The above description of the provided embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features provided herein.

Claims (9)

1. A method for determining parameters of a cylinder head unloading groove, characterized by comprising: Obtaining size parameters of a target area in the cylinder head, where the target area is an area where a relief groove can be set; Obtaining an initial response surface calculation model; Determining the number of test parameter groups according to the initial response surface calculation model; Determine a test parameter set according to the size parameter of the target area and the number of test parameter groups, wherein the test parameter set includes at least four groups of test parameters, and any two groups of test parameters include different sizes of the unloading groove; Controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue times set, wherein the number of simulation fatigue times in the simulation fatigue times set corresponds to the number of test parameter groups in the test parameter set; Determining a target response surface calculation model according to the set of simulated fatigue times and the set of test parameters; According to the size parameters of the target area and the target response surface calculation model, the target unloading groove parameters are determined, and the fatigue times corresponding to the target unloading groove parameters meet the preset requirements. 2. The cylinder head unloading groove parameter determination method according to claim 1, characterized in that the control preset simulation model simulates the test parameters of the test parameter set, comprising: Setting cylinder head simulation environment information, wherein the cylinder head simulation environment information indicates that the cylinder head environment reaches a boundary condition; Based on the cylinder head simulation environment information, the preset simulation model is controlled to simulate the test parameters of the test parameter set to obtain a set of simulated fatigue times. 3. The method for determining the parameters of the cylinder head unloading groove according to claim 1, characterized in that the number of groups of test parameters in the test parameter set is greater than or equal to the number of coefficients to be determined, and the target response surface calculation model is determined based on the simulation fatigue number set and the test parameter set, comprising: According to a preset fitting rule, the test parameters in the test parameter set and the corresponding simulation fatigue number set are calculated with the initial response surface calculation model to obtain the target coefficient; A target response surface calculation model is obtained according to the target coefficient and the initial response surface calculation model. 4. The method for determining cylinder head unloading groove parameters according to claim 1, further comprising: Controlling a preset simulation model to simulate the target unloading slot parameters to obtain a target simulation fatigue number; If the target simulation fatigue number is less than a preset threshold and/or the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, increase the number of test parameter groups, and return to execute the step of determining the test parameter set based on the size parameters of the target area and the number of test parameter groups. 5. The method for determining cylinder head unloading groove parameters according to claim 1, further comprising: Controlling a preset simulation model to simulate the target unloading slot parameters to obtain a target simulation fatigue number; If the target simulation fatigue number is less than a preset threshold and/or the target simulation fatigue number is less than any simulation fatigue number in the simulation fatigue number set, the initial response surface calculation model is updated, the order of the updated initial response surface calculation model is greater than the order of the initial response surface calculation model before the update, and the process returns to execute the step of determining the number of test parameter groups based on the initial response surface calculation model. 6. The method for determining the parameters of the cylinder head unloading groove according to claim 1, characterized in that the step of obtaining the size parameters of the target area in the cylinder head comprises: Based on the first target bolt position and the second target bolt position, obtaining a first distance, wherein the first distance corresponds to a length of the unloading groove; A second distance is obtained based on the positions of the two cylinder sealing bands on the cylinder head gasket, wherein the second distance corresponds to the width of the unloading groove; Based on the cylinder head thickness, a third distance is obtained, which corresponds to the depth of the relief groove. 7. A cylinder head unloading groove parameter determination device, characterized by comprising: An acquisition module, used for acquiring the size parameters of a target area in the cylinder head, wherein the target area is an area where a relief groove can be set; A model acquisition module is used to obtain an initial response surface calculation model; A group number determination module is used to determine the number of test parameter groups according to the initial response surface calculation model; A test parameter determination module, used to determine a test parameter set according to the size parameter of the target area and the number of test parameter groups, wherein the test parameter set includes at least four groups of test parameters, and any two groups of test parameters include different sizes of unloading grooves; A control module, used for controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue times set, wherein the number of simulation fatigue times in the simulation fatigue times set corresponds to the number of test parameter groups in the test parameter set; A model determination module, used to determine a target response surface calculation model according to the set of simulated fatigue times and the set of test parameters; The determination module is used to determine the target unloading groove parameters according to the size parameters of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameters meet the preset requirements. 8. An electronic device, comprising: Memory, processor; Wherein, the memory stores a processing program; The processor is used to load and execute the processing program stored in the memory to implement each step of the cylinder head unloading groove parameter determination method as described in any one of claims 1-6. 9. A readable storage medium, characterized in that a computer program is stored thereon, and the computer program is called and executed by a processor to implement the steps of the cylinder head unloading groove parameter determination method according to any one of claims 1 to 6.