CN118607264B - Control method for bench test block spectrum load, electronic equipment and storage medium - Google Patents
Control method for bench test block spectrum load, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a control method, electronic equipment and a storage medium for a bench test block spectrum load. The method comprises the following steps: acquiring a road test load spectrum of a chassis structural member; calculating virtual damage and first actual damage according to the road test load spectrum; carrying out rain flow counting decomposition on the road test load spectrum to obtain a rain flow counting pair; determining the spectrum load of the undetermined block with consistent virtual damage; calculating a second actual damage of the chassis structural member under the to-be-determined block spectrum load according to the to-be-determined block spectrum load and the constraint condition of the bench test; comparing the first actual damage with the second actual damage to obtain a comparison result; and iterating the spectrum load of the block to be determined according to the comparison result to obtain the spectrum load of the bench test block equivalent to the road test load spectrum. According to the invention, the bench test block spectrum load with the virtual damage and the actual damage being the same as the road test load spectrum is iterated, the consistency of the road test load spectrum and the bench test block spectrum load is ensured, the accuracy of test results is improved, and the test verification time of the chassis structural member is shortened.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a control method, electronic equipment and a storage medium for a bench test block spectrum load.
Background
The design and research of the structural components of the automobile chassis need to be carried out in the links of early CAE (Computer aided engineering) analysis, bench test verification, whole automobile road test verification and the like, and the key performance needs to reach the design target to be put into mass production.
As the whole vehicle road test verification time has long history, the bench test time is shorter. In order to more efficiently and accurately verify whether the structural member meets the performance index, it is important to quickly obtain an accurate block spectrum load for bench test.
The current method for acquiring the more accurate bench test block spectrum load mainly comprises the steps of decomposing a road test load spectrum by a rain flow counting method, and then decomposing the decomposed load count by utilizing a Miner accumulated damage criterion, wherein the block spectrum is similar to the total virtual damage of the road spectrum. However, the test piece cannot relatively operate like a whole vehicle due to the limitation of the bench platform, and the response of the constraint end to the load needs to be considered, so that the actual damage of the bench test by the block spectrum load obtained by the method cannot be equal to the road test damage, and the situation that the road test piece breaks and the bench test piece is good or the road test piece is good and the bench test piece breaks can occur in extreme cases. The design period of the chassis structural member is seriously influenced, and the realization of the aim of reducing the cost and the weight of the structural member is also hindered.
Disclosure of Invention
The invention aims to provide a control method, electronic equipment and a storage medium for a bench test block spectrum load, which can solve the technical problem that the bench test block spectrum load is inconsistent with the road test load spectrum actual damage in the prior art.
According to a first aspect of the present invention, there is provided a method of controlling a bench test block spectrum load, the method comprising:
Acquiring a road test load spectrum of a chassis structural member;
Calculating virtual damage and first actual damage of the chassis structural member according to a road test load spectrum of the chassis structural member, wherein the virtual damage is theoretical damage of the chassis structural member in a road test process, and the first actual damage is actual damage of the chassis structural member under the road test load spectrum;
performing rain flow counting decomposition on the road test load spectrum to obtain a rain flow counting pair corresponding to the road test load spectrum;
Determining a pending block spectrum load consistent with the virtual damage of the chassis structural member according to the rain flow count pair corresponding to the road test load spectrum, the virtual damage of the chassis structural member and the S-N curve corresponding to the chassis structural member;
Calculating a second actual damage of the chassis structural member under the spectrum load of the undetermined block according to the spectrum load of the undetermined block and the constraint condition of the bench test;
Comparing the first actual damage with the second actual damage to obtain a comparison result;
and iterating the spectrum load of the block to be determined according to the comparison result to obtain the spectrum load of the bench test block equivalent to the road test load spectrum.
Optionally, the comparing the first actual damage and the second actual damage to obtain a comparison result includes:
determining a distance between a location of the lesion in the first actual lesion and a location of the lesion in the second actual lesion;
determining a damage difference between a damage value in the first actual damage and a damage value in the second actual damage;
under the condition that the distance and the damage difference value meet comparison conditions, determining that a comparison result is met;
Under the condition that the distance and the damage difference value do not accord with comparison conditions, determining that the comparison result is not accord with the comparison conditions;
The comparison condition is that the distance is smaller than a preset distance threshold value and the damage difference value is smaller than a preset damage threshold value.
Optionally, the damage position in the first actual damage is the position of the damage value maximum area of the first actual damage, and the damage value in the first actual damage is the damage value of the damage value maximum area of the first actual damage;
the damage position in the second actual damage is the position of the damage value maximum area of the second actual damage, and the damage value in the second actual damage is the damage value of the damage value maximum area of the second actual damage.
Optionally, iterating the spectrum load of the block to be determined according to the comparison result to obtain a spectrum load of a bench test block equivalent to the road test load spectrum, including:
when the comparison result is coincidence, determining the spectrum load of the undetermined block as the spectrum load of the bench test block equivalent to the road test load spectrum;
When the comparison result is not coincident, changing the spectrum load of the undetermined block;
And re-executing the step of calculating a second actual damage of the chassis structural member under the undetermined block spectrum load.
Optionally, said modifying the pending block spectrum load comprises:
and re-determining the load amplitude, the load average value and the cycle times of the load of the block spectrum to be determined from the rain flow count pair corresponding to the road test load spectrum.
Optionally, the determining the pending block spectrum load consistent with the virtual damage of the chassis structural member according to the rain flow count pair corresponding to the road test load spectrum, the virtual damage of the chassis structural member and the S-N curve corresponding to the chassis structural member includes:
Determining the load amplitude and the load average value of the load of the undetermined block spectrum from the rain flow count pair corresponding to the road test load spectrum;
and substituting a Miner accumulated damage criterion into an S-N curve corresponding to the chassis structural member according to the virtual damage of the chassis structural member, and determining the cycle times of the to-be-determined block spectrum load.
Optionally, the calculating the virtual damage and the first actual damage of the chassis structural member according to the road test load spectrum of the chassis structural member includes:
Substituting the road test load spectrum into an S-N curve corresponding to the chassis structural member according to a Miner accumulated damage criterion to calculate virtual damage of the chassis structural member;
and calculating the first actual damage of the chassis structural member under the road test load spectrum through CAE software.
According to a second aspect of the present invention there is provided an electronic device comprising a processor and a memory, the memory having stored thereon a program or instructions executable by the processor, the program or instructions when executed by the processor performing the steps of the method according to the first aspect of the present invention.
According to a third aspect of the present invention there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor performs the steps of the method according to the first aspect of the present invention.
The invention has the beneficial effects that: according to the invention, the virtual damage of the road test load spectrum and the bench test block spectrum is equal by utilizing the damage equivalent principle, the second actual damage of the bench test block spectrum is calculated by substituting the constraint condition of the bench test, the second actual damage is compared with the first actual damage under the road test load spectrum, the bench test block spectrum load of which the virtual damage and the actual damage are the same as the road test load spectrum is iterated, the consistency of the road test load spectrum and the bench test block spectrum load is ensured, the accuracy of a test result is improved, and the test verification time of a chassis structural member is shortened.
Drawings
FIG. 1 is a flowchart of a method for controlling a spectrum load of a bench test block in an embodiment of the invention.
Fig. 2 is a schematic diagram of a road test load spectrum in an embodiment of the present invention.
FIG. 3 is a schematic S-N curve of a chassis structural member in accordance with an embodiment of the present invention.
FIG. 4 is a schematic diagram of a rain flow count decomposition in an embodiment of the invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description and claims of the present invention, the terms "first," "second," and the like, if any, may include one or more of those features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
As shown in fig. 1, the present embodiment describes a method for controlling a spectrum load of a bench test block, which includes steps 1100-1700.
Step 1100: and obtaining a road test load spectrum of the chassis structural member.
And obtaining a road test load spectrum of the chassis structural member by carrying out road test on the chassis structural member. For example, the chassis structure may be a spring-loaded arm. The spring disc bearing arm mainly bears the force in the vertical direction of the spring disc, which is generated by deformation of a coil spring in a suspension system due to road condition feedback, in the running process of a vehicle, and a road test load spectrum acquired by a road test field at the position is shown in figure 2. Where the abscissa indicates time and the ordinate indicates the magnitude of force.
Step 1200: calculating virtual damage and first actual damage of the chassis structural member according to a road test load spectrum of the chassis structural member, wherein the virtual damage is theoretical damage of the chassis structural member in a road test process, and the first actual damage is actual damage of the chassis structural member under the road test load spectrum.
In the road test process, the chassis structural member can be subjected to fatigue damage under the influence of external load. The damage in the road test process can be calculated through the road test load spectrum. The damage to the chassis structural member includes a virtual damage and a first actual damage. Wherein the virtual damage represents theoretical damage to the chassis structural member during a road test. The road test load spectrum comprises the stress condition of the chassis structural member in the road test process, and the theoretical damage and the first actual damage of the chassis structural member under the road test load spectrum can be calculated according to the stress condition. There is a gap between the theoretical injury and the first actual injury.
Step 1300: and carrying out rain flow counting decomposition on the road test load spectrum to obtain a rain flow counting pair corresponding to the road test load spectrum.
Step 1400: and determining the undetermined block spectrum load consistent with the virtual damage of the chassis structural member according to the rain flow count pair corresponding to the road test load spectrum, the virtual damage of the chassis structural member and the S-N curve corresponding to the chassis structural member.
As shown in fig. 3, the S-N curve is a stress-life curve, representing the relationship between stress and life experienced by the structural member.
Step 1500: and calculating a second actual damage of the chassis structural member under the spectrum load of the undetermined block according to the spectrum load of the undetermined block and the constraint condition of the bench test.
Step 1600: and comparing the first actual damage with the second actual damage to obtain a comparison result.
The actual lesions include lesion locations and lesion values. The damage location indicates the location on the chassis structure where damage occurs. And the damage value represents a specific value of damage generated at the damage location. Multiple damage locations may occur on the chassis structure, with each damage location corresponding to a damage value.
When comparing the first actual lesion with the second actual lesion, the comparison may be made from both the lesion location and the lesion value dimensions. When the damage position and the damage value are the same, the first actual damage is considered to be consistent with the second actual damage, and the comparison result is consistent. If the damage positions are different or the damage values are different, the first actual damage is not consistent with the second actual damage, and the comparison result is not consistent.
Step 1700: and iterating the spectrum load of the block to be determined according to the comparison result to obtain the spectrum load of the bench test block equivalent to the road test load spectrum.
If the comparison results are consistent, i.e., the first actual damage is consistent with the second actual damage, the pending block spectrum load may be determined as a bench test block spectrum load.
If the comparison result is not consistent, namely the first actual damage is inconsistent with the second actual damage, the undetermined block spectrum load is redetermined, and the actual damage of the undetermined block spectrum load is calculated, until the second actual damage of the undetermined block spectrum load is consistent with the first actual damage of the road test load spectrum, and then iteration is stopped. And determining the spectrum load of the undetermined block with consistent actual damage as the spectrum load of the test block of the bench.
According to the invention, the virtual damage of the road test load spectrum and the bench test block spectrum is equal by utilizing the damage equivalent principle, the second actual damage of the bench test block spectrum is calculated by substituting the constraint condition of the bench test, the second actual damage is compared with the first actual damage under the road test load spectrum, the bench test block spectrum load of which the virtual damage and the actual damage are the same as the road test load spectrum is iterated, the consistency of the road test load spectrum and the bench test block spectrum load is ensured, the accuracy of a test result is improved, and the test verification time of a chassis structural member is shortened.
In this embodiment, the step 1600 includes 1610-1640.
Step 1610: a distance between a location of the lesion in the first actual lesion and a location of the lesion in the second actual lesion is determined.
Step 1620: a lesion difference between a lesion value in the first actual lesion and a lesion value in the second actual lesion is determined.
Step 1630: and under the condition that the distance and the damage difference value meet comparison conditions, determining that the comparison result is met.
Step 1640: and under the condition that the distance and the damage difference value do not meet the comparison condition, determining that the comparison result is not met. The comparison condition is that the distance is smaller than a preset distance threshold value and the damage difference value is smaller than a preset damage threshold value.
And establishing a coordinate system to obtain the coordinates of each damage position in the first actual damage and the coordinates of each damage position in the second actual damage. And calculating the distance according to the coordinates of the damage position in the first actual damage and the coordinates of the damage position in the second actual damage.
The preset distance threshold and the preset damage threshold may be determined based on the type of chassis structural member. Different distance thresholds and damage thresholds may be set for different chassis structural members.
When the distance between the damage position in the first actual damage and the damage position in the second actual damage is smaller than the preset distance threshold value, and the damage difference between the damage value in the first actual damage and the damage value in the second actual damage is smaller than the preset damage threshold value, the first actual damage and the second actual damage are considered to be consistent, and the comparison result is consistent. Otherwise, the first actual damage and the second actual damage are not consistent, and the comparison result is not consistent.
According to the invention, the first actual damage and the second actual damage are compared from two dimensions of the damage value and the damage position, so that the accuracy of a comparison result is ensured.
In this embodiment, the damaged position in the first actual damage is a position of a region with a maximum damaged value of the first actual damage, and the damaged value in the first actual damage is a damaged value of the region with the maximum damaged value of the first actual damage.
The damage position in the second actual damage is the position of the damage value maximum area of the second actual damage, and the damage value in the second actual damage is the damage value of the damage value maximum area of the second actual damage.
The first actual damage comprises a plurality of damage positions and damage values corresponding to the damage positions. In this embodiment, a first maximum damage value and a damage position corresponding to the first maximum damage value are determined from the first actual damage. The first maximum damage value is the largest damage value among a plurality of damage values of the first actual damage. For example, the damage value in the first damage includes 0.073, 0.051, 0.086, 0.085, then the maximum damage value is 0.086.
Similarly, a second maximum damage value and a damage position corresponding to the second maximum damage value are determined from the second actual damage. The second maximum damage value is the largest damage value among a plurality of damage values of the second actual damage.
And comparing the first maximum damage value with the second maximum damage value, and comparing the damage position corresponding to the first maximum damage value with the damage position corresponding to the second maximum damage value.
And if the damage difference value between the first maximum damage value and the second maximum damage value is larger than the preset damage threshold value, the first actual damage is not consistent with the second actual damage. And if the distance between the damage position corresponding to the first maximum damage value and the damage position corresponding to the second maximum damage value is greater than a distance threshold value, the first actual damage is not consistent with the second actual damage.
According to the method, the maximum damage value is determined from the plurality of damage values of the actual damage, only the maximum damage value in the first actual damage and the corresponding damage position are compared with the maximum damage value in the second actual damage and the corresponding damage position, and all the damage values in the first actual damage and all the damage values in the second actual damage are not required to be compared, so that data needing to be compared are reduced, and efficiency is improved.
In this embodiment, the step 1700 includes steps 1710-1730.
Step 1710: and when the comparison result is coincidence, determining the undetermined block spectrum load as the block spectrum load equivalent to the road test load spectrum.
Step 1720: and when the comparison result is inconsistent, changing the spectrum load of the undetermined block.
Specifically, the modifying the pending block spectrum load includes: and re-determining the load amplitude, the load average value and the cycle times of the load of the block spectrum to be determined from the rain flow count pair corresponding to the road test load spectrum.
Step 1730: and re-executing the step of calculating a second actual damage of the chassis structural member under the undetermined block spectrum load.
If the comparison results are consistent, i.e., the first actual damage is consistent with the second actual damage, the pending block spectrum load may be determined as a bench test block spectrum load.
If the comparison result is not consistent, namely the first actual damage is inconsistent with the second actual damage, the circulation times of the undetermined block spectrum load are redetermined, the actual damage of the new undetermined block spectrum load is calculated, and iteration is stopped until the second actual damage of the undetermined block spectrum load is consistent with the first actual damage of the road test load spectrum. And determining the spectrum load of the undetermined block with consistent actual damage as the spectrum load of the test block of the bench.
In this embodiment, the step 1400 includes steps 1410-1420.
Step 1410: and determining the load amplitude and the load average value of the load of the undetermined block spectrum from the rain flow count pair corresponding to the road test load spectrum.
Step 1420: and substituting a Miner accumulated damage criterion into an S-N curve corresponding to the chassis structural member according to the virtual damage of the chassis structural member, and determining the cycle times of the to-be-determined block spectrum load.
The undetermined block spectrum load comprises a load amplitude, a load average value and cycle times. Wherein the load amplitude and load mean may be determined from a rain flow count pair of the road test load spectrum.
In this embodiment, the step 1200 includes: substituting the road test load spectrum into an S-N curve corresponding to the chassis structural member according to a Miner accumulated damage criterion to calculate virtual damage of the chassis structural member; and calculating the first actual damage of the chassis structural member under the road test load spectrum through CAE software.
The Miner cumulative damage rule is a fundamental principle in the engineering field with respect to fatigue failure. It indicates that after a material or structure has been subjected to multiple cyclic loads, failure may occur even if the stress on each load is below the yield point of the material. This is because the material gradually builds up small damage under cyclic loading, which may ultimately lead to fatigue failure of the material. This rule emphasizes the cumulative nature of fatigue failure, i.e., the accumulation of damage is a gradual process, rather than occurring instantaneously. Therefore, in designing engineering structures, it is necessary to consider fatigue properties of materials to ensure safety and reliability of the structures. The calculation formula of the virtual lesion is as follows.
。
Wherein the method comprises the steps ofRepresenting the virtual total damage under the road test load spectrum.Representing virtual damage at each stress amplitude level in the road test load spectrum.
The invention relates to a method for controlling the spectrum load of a bench test block, which is exemplified by a spring disc bearing arm. The road test load spectrum of the spring plate bearing arm is shown in fig. 2, and the virtual total damage of the road test load spectrum is calculated according to the S-N curve of the used material. The S-N curve calculation formula is as follows.
。
As shown in FIG. 3, in whichIndicating the lifetime of the material at the inflection point of the S-N curve. In the embodiment, 10 2 parts of body steel are taken, and 10 2 parts of welding line materials are taken.Representing the stress level of the material at the inflection point of the S-N curve. In the embodiment, 1000 parts of body steel are taken, and 2000 parts of welding line materials are taken. k represents the slope of the S-N logarithmic curve. In the embodiment, the body steel is taken 5, and the welding line material is taken 3.N represents the lifetime of the material at S stress level. In the embodiment, if the damaged main body is a welding seam, selecting a welding seam material S-N curve, and calculating the virtual total damage of the spring arm under the road test load spectrum by using a Miner accumulated damage criterion, wherein the formula is as follows.
。
Wherein the method comprises the steps ofRepresenting the virtual total damage under the road test load spectrum.Representing virtual damage at each stress amplitude level in the road test load spectrum.
Then, the road test load spectrum is disassembled by a rain flow counting method, and a rain flow counting pair with the circulation times, the load average value and the load amplitude is obtained as shown in fig. 4. After decomposition, obtaining n groups of typical load average values and load amplitude values in a load spectrum, wherein n is the number of load steps required by a bench test. The load amplitude of each group is S 1、S2、…、Sn, the load cycle times of each group is n 1、n2、…、nn, and the load cycle times are calculatedSubstituting the S-N curve of the welding line material for virtual damage under the load of the ith group, and enablingCalculating the cycle times n 1、n2、…、nn of each group of loads, combining the load amplitude values of each group with the cycle times and calculating the combined load amplitude values and the cycle times as the load of the undetermined block spectrum。
Calculating actual damage results of road test load spectrum to spring disc bearing arm in CAE software, wherein the calculated damage maximum area isMaximum damage of. Substituting the constraint condition of the bench test, calculating the spectrum load of the undetermined block in CAE softwareUnder the constraint condition, the actual damage result of the spring disc bearing arm is calculated as the maximum damage areaMaximum damage of. Order theA distance between the areas with the greatest damage to the two,The tolerance threshold is set as the distance threshold for the difference of the damage maximum valuesThreshold of injury. If the following formula is satisfied, the spectrum load of the block to be determined is considered to satisfy the requirement, namely the load of the bench is formed。
。
。
If the formula is not satisfied, searching a typical load average value and a load amplitude value in a load spectrum after the rain flow decomposition, and recalculating to obtain a load of a spectrum to be determinedIterative verification until the final meeting condition is obtained to be the rack load。
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Those of ordinary skill in the art will appreciate that the modules and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and device described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment of the invention.
In addition, each functional module in the embodiment of the present invention may be integrated in one processing module, or each module may exist alone physically, or two or more modules may be integrated in one module.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method for energy saving signal transmission/reception of the various embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
It should be understood that, the sequence numbers of the steps in the summary and the embodiments of the present invention do not necessarily mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention. The foregoing description of implementations of the present disclosure has been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the disclosure to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the disclosure. The embodiments were chosen and described in order to explain the principles of the present disclosure and its practical application to enable one skilled in the art to utilize the present disclosure in various embodiments and with various modifications as are suited to the particular use contemplated.
Claims (7)
1. A method for controlling a bench test block spectrum load, the method comprising:
Acquiring a road test load spectrum of a chassis structural member;
Calculating virtual damage and first actual damage of the chassis structural member according to a road test load spectrum of the chassis structural member, wherein the virtual damage is theoretical damage of the chassis structural member in a road test process, and the first actual damage is actual damage of the chassis structural member under the road test load spectrum;
performing rain flow counting decomposition on the road test load spectrum to obtain a rain flow counting pair corresponding to the road test load spectrum;
Determining a pending block spectrum load consistent with the virtual damage of the chassis structural member according to the rain flow count pair corresponding to the road test load spectrum, the virtual damage of the chassis structural member and the S-N curve corresponding to the chassis structural member;
Calculating a second actual damage of the chassis structural member under the spectrum load of the undetermined block according to the spectrum load of the undetermined block and the constraint condition of the bench test;
Comparing the first actual damage with the second actual damage to obtain a comparison result;
iterating the spectrum load of the block to be determined according to the comparison result to obtain a spectrum load of the bench test block equivalent to the road test load spectrum;
Iterating the spectrum load of the undetermined block according to the comparison result to obtain a spectrum load of a bench test block equivalent to the road test load spectrum, wherein the iterating comprises the following steps:
when the comparison result is coincidence, determining the spectrum load of the undetermined block as the spectrum load of the bench test block equivalent to the road test load spectrum;
When the comparison result is not coincident, changing the spectrum load of the undetermined block;
re-executing the step of calculating a second actual damage of the chassis structural member under the undetermined block spectrum load;
the altering the pending block spectrum load comprises:
and re-determining the load amplitude, the load average value and the cycle times of the load of the block spectrum to be determined from the rain flow count pair corresponding to the road test load spectrum.
2. The method of claim 1, wherein comparing the first actual lesion with the second actual lesion results in a comparison result, comprising:
determining a distance between a location of the lesion in the first actual lesion and a location of the lesion in the second actual lesion;
determining a damage difference between a damage value in the first actual damage and a damage value in the second actual damage;
under the condition that the distance and the damage difference value meet comparison conditions, determining that a comparison result is met;
Under the condition that the distance and the damage difference value do not accord with comparison conditions, determining that the comparison result is not accord with the comparison conditions;
The comparison condition is that the distance is smaller than a preset distance threshold value and the damage difference value is smaller than a preset damage threshold value.
3. The method of claim 2, wherein the location of the injury in the first actual injury is the location of the region of greatest injury value from the first actual injury, and the value of the injury in the first actual injury is the value of the injury in the region of greatest injury value from the first actual injury;
the damage position in the second actual damage is the position of the damage value maximum area of the second actual damage, and the damage value in the second actual damage is the damage value of the damage value maximum area of the second actual damage.
4. The method of claim 1, wherein determining the pending block spectrum load consistent with the virtual damage to the chassis structure from the rain flow count pair corresponding to the road test load spectrum, the virtual damage to the chassis structure, and the S-N curve corresponding to the chassis structure comprises:
Determining the load amplitude and the load average value of the load of the undetermined block spectrum from the rain flow count pair corresponding to the road test load spectrum;
and substituting a Miner accumulated damage criterion into an S-N curve corresponding to the chassis structural member according to the virtual damage of the chassis structural member, and determining the cycle times of the to-be-determined block spectrum load.
5. The method of claim 1, wherein calculating the virtual damage and the first actual damage to the chassis structure from the road test load spectrum of the chassis structure comprises:
Substituting the road test load spectrum into an S-N curve corresponding to the chassis structural member according to a Miner accumulated damage criterion to calculate virtual damage of the chassis structural member;
and calculating the first actual damage of the chassis structural member under the road test load spectrum through CAE software.
6. An electronic device comprising a processor and a memory, the memory having stored thereon a program or instructions executable by the processor, the program or instructions, when executed by the processor, implementing the steps of the method of any of claims 1-5.
7. A readable storage medium, characterized in that it stores thereon a program or instructions, which when executed by a processor, implement the steps of the method according to any of claims 1-5.
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| CN115774918A (en) * | 2021-09-07 | 2023-03-10 | 广汽埃安新能源汽车有限公司 | Method and device for determining test load spectrum and storage medium |
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| CN105718633A (en) * | 2016-01-15 | 2016-06-29 | 重庆长安汽车股份有限公司 | Method for analyzing load of chassis part |
| CN110442973A (en) * | 2019-08-06 | 2019-11-12 | 安徽江淮汽车集团股份有限公司 | A kind of durability degree test method, system and the storage medium of vehicle key components and parts |
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