CN119004919A - Finite element simulation analysis method of flexible interconnection system - Google Patents
Finite element simulation analysis method of flexible interconnection system Download PDFInfo
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Abstract
The invention belongs to the technical field of finite element simulation, in particular to a finite element simulation analysis method of a flexible interconnection system, which comprises the steps of obtaining a finite element grid division scheme of the flexible interconnection system based on dimensional condition data of the flexible interconnection system, determining the area of each flexible interconnection system, analyzing material parameters of the area of each flexible interconnection system, determining the simulation analysis applied environmental conditions of the flexible interconnection system areas, analyzing the strength and the structural vibration state of the mechanical connectors of the flexible interconnection system areas, and determining the qualification grade of the flexible interconnection system by combining the strength characteristic values of the flexible interconnection system areas and the vibration state characteristic values of the flexible interconnection system areas. The invention solves the problems of insufficient dynamic analysis processing capacity and insufficient environmental factor consideration of the traditional flexible interconnection system, is beneficial to more accurately evaluating the overall behavior and performance of the flexible interconnection system, determines the qualification grade and more accurately reflects the real working state of the system.
Description
Technical Field
The invention belongs to the technical field of finite element simulation, and particularly relates to a finite element simulation analysis method of a flexible interconnection system.
Background
With the development of industrial technologies, flexible interconnection systems are widely used in various fields, such as robotics, flexible manufacturing systems, aerospace, automotive industry, biomedical devices, intelligent devices, and the like, which often need to handle complex motions, flexible components, and multiple interactions, and compared with traditional rigid systems, flexible interconnection systems have the advantages of flexibility, light weight, strong adaptability, and the like, and can better cope with dynamic loads, nonlinear behaviors, and complex environmental conditions, for example, flexible robotic arms, flexible sensors, wearable devices, and the like, have higher and higher demands on flexible systems. Along with the progress of computer technology and numerical simulation tools, a finite element method becomes one of main methods for analyzing a complex system, and the finite element method can simulate deformation, stress distribution and dynamic behavior of a flexible interconnection system by discretizing a complex geometry and multi-degree-of-freedom system.
However, the existing simulation research on the flexible interconnection system has some defects, which are particularly reflected in the defect of the dynamic analysis processing capacity of the traditional flexible interconnection system, the mechanical property of the flexible material is usually highly sensitive to environmental conditions, and the traditional finite element analysis is often insufficient in processing when considering the factors, so that the simulation result and the actual situation have larger difference; the flexible interconnection system may suffer unexpected dynamic impact or resonance in actual operation, and the simulation fails to accurately predict the conditions, which may cause structural failure, local damage or instability of the system; the environment has significant influence on the mechanical properties of the flexible material, particularly the high polymer material and the composite material, in the environment with larger temperature change, the elastic modulus, the yield strength, the fatigue property and the like of the material can be significantly changed, and if the environmental effects are ignored or simplified by the traditional finite element simulation, the performance of the system is possibly reduced in the high-temperature or low-temperature environment, and the normal operation or the failure can not be realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a finite element simulation analysis method of a flexible interconnection system, which can effectively solve the problems related to the background art, is beneficial to more accurately evaluating the overall behavior and performance of the flexible interconnection system, determining the qualification grade and more accurately reflecting the real working state of the system.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the finite element simulation analysis method of the flexible interconnection system comprises the following steps:
Acquiring a flexible interconnection system size condition data set, acquiring a flexible interconnection system finite element grid division scheme based on the acquired flexible interconnection system size condition data set, and determining each flexible interconnection system area;
Analyzing material parameters of the flexible interconnection system areas based on the flexible interconnection system areas, and determining environmental conditions applied by the simulation analysis of the flexible interconnection system areas;
Applying environmental conditions based on the simulation analysis of the flexible interconnection system areas, and analyzing the strength of the mechanical connectors of the flexible interconnection system areas to obtain the strength characteristic values of the flexible interconnection system areas;
applying environmental conditions based on the simulation analysis of the flexible interconnection system areas, and analyzing the vibration states of the flexible interconnection system area structures to obtain the characteristic values of the vibration states of the flexible interconnection system areas;
and determining the qualification grade of the flexible interconnection system by combining the intensity characteristic value of each flexible interconnection system area and the vibration state characteristic value of each flexible interconnection system area.
Preferably, the flexible interconnection system dimension condition data set includes a total length of the flexible interconnection system, an average unit pitch length of the flexible interconnection system, a maximum radius of curvature of the flexible interconnection system, a total width of the flexible interconnection system, and an outer diameter of the flexible interconnection system.
Preferably, the obtaining the flexible interconnection system finite element grid division scheme based on the obtained flexible interconnection system size condition data set determines each flexible interconnection system area, and the process is as follows:
Storing the total length of the flexible interconnection system, the average unit pitch length of the flexible interconnection system, the maximum curvature radius of the flexible interconnection system, the total width of the flexible interconnection system and the outer diameter of the flexible interconnection system as specified labels, and comparing the specified labels with the finite element meshing schemes of the flexible interconnection system corresponding to the specified labels stored in a database to obtain the finite element meshing schemes of the flexible interconnection system corresponding to the specified labels;
based on the finite element meshing scheme of the flexible interconnection system corresponding to the specified label, finite element meshing is carried out on the flexible interconnection system, and each grid area after the finite element meshing of the flexible interconnection system is marked as each flexible interconnection system area.
Preferably, the analyzing the material parameters of each flexible interconnection system area determines that the simulation analysis of each flexible interconnection system area applies environmental conditions, and the process is as follows:
Acquiring regional material parameter data sets of all flexible interconnection systems, and comprehensively analyzing to obtain material characteristic values of all flexible interconnection systems based on the acquired regional material parameter data sets of all flexible interconnection systems, wherein the material characteristic values of all flexible interconnection systems are used as analysis basis for determining environmental conditions imposed by regional simulation analysis of all flexible interconnection systems;
storing the characteristic value of the flexible interconnection system material as a designated label, comparing the designated label with simulation analysis application environment conditions corresponding to the designated labels stored in a database to obtain simulation analysis application environment conditions corresponding to the label, and taking the simulation analysis application environment conditions corresponding to the label as the simulation analysis application environment conditions of the flexible interconnection system region corresponding to the characteristic value of the flexible interconnection system material.
Preferably, the flexible interconnection system region material parameter data set includes an elastic modulus of a material of each flexible interconnection system region, a poisson ratio of a material of each flexible interconnection system region, and a material density of each flexible interconnection system region.
Preferably, the analyzing the strength of the mechanical connector in each flexible interconnection system area to obtain the strength characteristic value of each flexible interconnection system area includes the following steps:
Acquiring a strength data set of mechanical connectors of each flexible interconnection system region, wherein the strength data set of the mechanical connectors of each flexible interconnection system region comprises absolute values of differences between tensile strength and reference tensile strength of each flexible interconnection system region, absolute values of differences between yield strength and reference yield strength of each flexible interconnection system region and absolute values of differences between compressive strength and reference compressive strength of each flexible interconnection system region;
And comprehensively analyzing to obtain the regional intensity characteristic values of the flexible interconnection systems based on the acquired regional mechanical connector intensity data sets of the flexible interconnection systems, wherein the regional intensity characteristic values of the flexible interconnection systems are used as analysis basis for determining the qualification grade of the flexible interconnection systems.
Preferably, the obtaining formula of the regional intensity characteristic value of each flexible interconnection system is as follows:
；
In the formula, For the i-th flexible interconnect system area strength characteristic,The absolute value of the difference between the tensile strength of the ith flexible interconnect system area and the reference tensile strength,The absolute value of the difference between the yield strength of the ith flexible interconnect system area and the reference yield strength,Is the absolute value of the difference between the compressive strength of the ith flexible interconnect system area and the reference compressive strength,To be set upIs used for the compensation factor of (a),To be set upIs used for the compensation factor of (a),To be set upI is the number of the flexible interconnect system area.
Preferably, the analyzing the vibration state of the area structure of each flexible interconnection system to obtain the characteristic value of the vibration state of the area of each flexible interconnection system comprises the following steps:
Acquiring a vibration state data set of each flexible interconnection system region structure, wherein the vibration state data set of each flexible interconnection system region structure comprises an absolute value of a difference value between natural frequency and reference natural frequency of each flexible interconnection system region, amplitude of each flexible interconnection system region and damping ratio of each flexible interconnection system region;
based on the obtained vibration state data set of the area structure of each flexible interconnection system, comprehensively analyzing to obtain the vibration state characteristic value of the area of each flexible interconnection system, wherein the vibration state characteristic value of the area of each flexible interconnection system is used as an analysis basis for determining the qualification grade of the flexible interconnection system.
Preferably, the obtaining formula of the vibration state characteristic value of each flexible interconnection system area is as follows:
；
In the formula, For the i-th flexible interconnect system region vibration state characteristic value,The absolute value of the difference between the natural frequency of the ith flexible interconnect system region and the reference natural frequency,For the i-th flexible interconnect system area amplitude,For the i-th flexible interconnect system area damping ratio,To be set upIs used for the compensation factor of (a),To be set upIs used for the compensation factor of (a),To be set upI is the number of the flexible interconnect system area and e is a natural constant.
Preferably, the determining the qualification grade of the flexible interconnection system includes the following steps:
Importing the intensity characteristic values of the flexible interconnection system areas and the vibration state characteristic values of the flexible interconnection system areas into a flexible interconnection system grade analysis model to obtain flexible interconnection system grade analysis characteristic values, wherein the flexible interconnection system grade analysis characteristic values are used as analysis basis for determining the qualified grade of the flexible interconnection system;
and storing the grade analysis characteristic value of the flexible interconnection system as a designated label, and comparing the designated label with the qualified grade of the flexible interconnection system corresponding to each designated label stored in a database to obtain the qualified grade of the flexible interconnection system corresponding to the designated label.
The invention has the following beneficial effects:
According to the invention, by acquiring the size condition data set of the flexible interconnection system, a more accurate geometric model can be created in finite element analysis, so that the accuracy of a simulation result is improved, the model can accurately reflect the actual size, shape and connection mode of the system, the analysis of material parameters of each region is realized, the material properties of different regions can reflect the performance under the actual working condition, the overall behavior and performance of the flexible interconnection system can be more accurately evaluated, the overall performance of the flexible interconnection system can be comprehensively evaluated by combining the intensity characteristic value and the vibration state characteristic value of each region, the qualification grade is determined, and the actual working state of the system is more accurately reflected.
According to the invention, the flexible interconnection system finite element grid division scheme is obtained by acquiring the flexible interconnection system dimension condition data set, each flexible interconnection system region is determined, the dimension condition data set provides a reliable basis for finite element grid division, the situation that grids are too coarse or dense can be avoided, reasonable grid division can ensure that stress distribution of key regions is captured finely, the dimension condition of the system is known, local encryption grids can be carried out in stress concentration regions or complex geometric regions, thicker grids are used in regions with smaller changes or smaller stress, the consumption of calculation resources can be reduced on the premise of ensuring accuracy, the calculation efficiency is improved, the dimension condition data set is helpful for identifying possible stress concentration regions, finer grid division can be carried out, the stress concentration phenomenon can be captured, and the potential structural failure risk can be found in advance.
According to the invention, the material parameters of the flexible interconnection system areas are analyzed to determine the application environment conditions of the flexible interconnection system area simulation analysis, the material parameters of the flexible interconnection system areas are analyzed, the application environment conditions in the simulation are ensured to be consistent with the actual working environment, the mechanical behavior of the material under the actual working condition can be reflected more truly, the design deviation caused by insufficient consideration of the material characteristics is avoided, different materials can show significantly different mechanical characteristics under different environment conditions (such as high temperature, low temperature, high humidity, corrosion environment and the like), the performance of the flexible interconnection system under the extreme environment can be better evaluated through the comprehensive material parameters and the environment conditions, different environment conditions can be applied to each area through simulation, and thus the differential optimization design is realized, and the performance optimization of each area is ensured.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention;
FIG. 2 is a flowchart illustrating steps for determining environmental conditions imposed by a regional simulation analysis of each flexible interconnect system;
FIG. 3 is a three-dimensional image of the variation of the material characteristic values of each flexible interconnect system with the material density of each flexible interconnect system region and the compensation factors of the material density of each flexible interconnect system region;
FIG. 4 is an image of the variation of material characteristics of each flexible interconnect system as a function of material density of each flexible interconnect system region.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
As shown in fig. 1, the finite element simulation analysis method of the flexible interconnection system includes the steps: acquiring a flexible interconnection system size condition data set, acquiring a flexible interconnection system finite element grid division scheme based on the acquired flexible interconnection system size condition data set, and determining each flexible interconnection system area.
The flexible interconnection system dimension condition data set specifically comprises the total length of the flexible interconnection system, the average unit pitch length of the flexible interconnection system, the maximum curvature radius of the flexible interconnection system, the total width of the flexible interconnection system and the outer diameter of the flexible interconnection system.
The overall length of a flexible interconnect system refers to the overall length of the system from one end to the other, generally including the length of all flexible units, connectors, and related components; the unit pitch length refers to the center distance between two adjacent flexible units in the flexible interconnection system; the average cell pitch length is the average of all the cell pitch lengths in the system; maximum radius of curvature refers to the maximum radius of curvature of a portion of a flexible interconnect system, typically used to describe the minimum radius of curvature that the system can withstand, beyond which structural failure or damage can result if a certain bending region of the system has the maximum allowable radius of curvature; the total width of a flexible interconnect system refers to the width of the system in the direction of the largest cross-section, which is generally used to describe the lateral dimensions of the system, particularly for flexible structures that are two-dimensional or have a wider portion; the outer diameter of a flexible interconnect system refers to the largest diameter of the system in cross-section, and is generally applicable to cylindrical or similar flexible structures (e.g., flexible tubing, cables, etc.), representing the largest outer dimension of its cross-sectional profile. The total length of the flexible interconnection system, the average unit pitch length of the flexible interconnection system, the maximum radius of curvature of the flexible interconnection system, the total width of the flexible interconnection system and the outer diameter of the flexible interconnection system are obtained based on a three-dimensional scanner.
The total length of the flexible interconnect system is typically made up of a plurality of connected cell segments, with the length of each cell segment being determined by its pitch, and the total length of the system being directly related to the cell pitch length, if the system is made up of a plurality of cell segments of the same length, the total length can be obtained by multiplying the cell pitch length by the number of cells; the overall length and the maximum radius of curvature together affect the morphology of the flexible system, with the maximum radius of curvature describing the minimum degree of curvature that the system can withstand, with a larger radius of curvature meaning that the system bends more gently, while the overall length is not directly mathematically related to the radius of curvature, larger systems typically have a larger radius of curvature because they need to maintain sufficient structural stability to avoid damage when bending; the outer diameter refers to the largest diameter of the cross section of the flexible system, which is generally applicable to tubular or similar structures, and the relationship of the overall length to the outer diameter is generally reflected in the use scenario of the system, with larger outer diameters potentially increasing the rigidity of the system, reducing its flexibility of bending, and thus affecting the overall length and bending characteristics of the system.
Based on the obtained flexible interconnection system size condition data set, a flexible interconnection system finite element grid division scheme is obtained, and each flexible interconnection system area is determined, wherein the specific analysis process is as follows: storing the total length of the flexible interconnection system, the average unit pitch length of the flexible interconnection system, the maximum curvature radius of the flexible interconnection system, the total width of the flexible interconnection system and the outer diameter of the flexible interconnection system as specified labels, and comparing the specified labels with the finite element meshing schemes of the flexible interconnection system corresponding to the specified labels stored in a database to obtain the finite element meshing schemes of the flexible interconnection system corresponding to the specified labels; based on the finite element meshing scheme of the flexible interconnection system corresponding to the specified label, finite element meshing is carried out on the flexible interconnection system, and each grid area after the finite element meshing of the flexible interconnection system is marked as each flexible interconnection system area.
The key size data of the system is stored as a designated label and can be compared with the optimized grid division scheme in the database, so that the adopted grid division scheme is ensured to be highly matched with the geometric size and the characteristics of the system, the human intervention and trial-and-error process are reduced, and the accuracy of grid division is improved; comparing the size condition of the flexible interconnection system with the existing grid division scheme, and ensuring that the grid division scheme is suitable for the geometric characteristics of the system; for example, in a stress concentration area or an area with larger curvature, finer grid division may be required, while in other flatter areas, thicker grids may be used, so that the rationality of grid division can be ensured, and the accuracy of simulation analysis is improved; the existing grid division schemes in the database are automatically compared, an optimal grid division strategy for resource utilization can be selected, the calculation burden caused by excessively fine grid division is avoided, and meanwhile, the fact that enough resolution is available in a key area for fine analysis is ensured, so that the simulation precision can be improved, and the calculation cost can be reduced.
And analyzing material parameters of the flexible interconnection system areas based on the flexible interconnection system areas, and determining environmental conditions imposed by the simulation analysis of the flexible interconnection system areas. As shown in fig. 2, the specific analysis process is: acquiring regional material parameter data sets of all flexible interconnection systems, and comprehensively analyzing to obtain material characteristic values of all flexible interconnection systems based on the acquired regional material parameter data sets of all flexible interconnection systems, wherein the material characteristic values of all flexible interconnection systems are used as analysis basis for determining environmental conditions imposed by regional simulation analysis of all flexible interconnection systems; storing the characteristic value of the flexible interconnection system material as a designated label, comparing the designated label with simulation analysis application environment conditions corresponding to the designated labels stored in a database to obtain simulation analysis application environment conditions corresponding to the label, and taking the simulation analysis application environment conditions corresponding to the label as the simulation analysis application environment conditions of the flexible interconnection system region corresponding to the characteristic value of the flexible interconnection system material.
The material characteristic values of each flexible interconnection system region are different, more accurate environmental conditions can be applied to different regions by taking the characteristic values as input basis, different regions of the flexible interconnection system can be composed of different materials or have different physical properties (such as elastic modulus, yield strength and the like), and corresponding environmental conditions can be applied by acquiring the material characteristic values of each region, so that personalized simulation analysis is performed for each region; the material characteristic values are stored as the appointed labels and compared with the existing labels in the database, so that the proper simulation environment conditions can be rapidly determined, the complicated processes of manual setting and repeated debugging are avoided, the automatic comparison method not only improves the working efficiency, but also ensures the rationality of the applied environment conditions, and the adaptability of the flexible interconnection system in complex working conditions is better predicted, thereby improving the robustness of the design.
The flexible interconnection system regional material parameter data set specifically comprises the elastic modulus of the flexible interconnection system regional material, the poisson ratio of the flexible interconnection system regional material and the material density of the flexible interconnection system regional material.
The elastic modulus of the material is the rigidity of the material under tensile or compressive load, namely the ratio of stress to strain, is obtained based on a dynamic mechanical analyzer, the Poisson ratio of the material is the ratio of transverse deformation to longitudinal deformation when the material is stressed, is obtained based on a universal material testing machine, and the density of the material is the ratio of the mass to the volume of the material, represents the tightness degree of the material and is obtained based on an X-ray or ultrasonic method.
High modulus materials generally exhibit greater tensile stiffness, which may result in less lateral deformation of the material when stretched, resulting in lower poisson's ratio (e.g., lower poisson's ratio for rigid materials such as steel), whereas low modulus flexible materials (e.g., rubber) generally have higher poisson's ratio because of significant lateral deformation when stretched in the machine direction; higher density materials (e.g., metals) tend to have higher elastic moduli because of their tighter molecular structure and more effective resistance to deformation, and low density materials (e.g., polymers or foams) generally have lower elastic moduli, meaning that they are more prone to deformation when subjected to forces; high density materials typically have a relatively regular, compact internal structure, which results in their poisson's ratio being relatively low, i.e., less deformation in the transverse direction (e.g., materials such as steel, metal, etc.) when subjected to a force, while low density materials (e.g., foam or porous materials) have a relatively high poisson's ratio due to relatively loose internal structure, typically greater transverse deformation when stretched.
The material characteristic values of the flexible interconnection systems are obtained by the following formulas:
；
In the formula, For the ith flexible interconnect system material characteristic value,For the i-th flexible interconnect system region material elastic modulus,Poisson's ratio for the ith flexible interconnect system area material,For the ith flexible interconnect system area material density,To be set upIs used for the compensation factor of (a),To be set upIs used for the compensation factor of (a),To be set upI is the number of flexible interconnect system areas, i=1, 2, 3.
In this embodiment, when calculating each formula, normalization processing may be performed on each parameter as required. The elastic modulus of the material reflects the rigidity, the Poisson ratio reflects the deformation characteristics of the material in different directions, the density determines the weight and dynamic response of the material, the overall mechanical property of the material can be accurately reflected by combining the parameters, a more accurate characteristic value of the material is obtained, the elastic modulus and Poisson ratio of the material directly influence the stress distribution and deformation condition of the system when the system is stressed, the density influences the inertia force and dynamic load response of the system, and the characteristic value of the material is used as the core input of simulation analysis, so that the accuracy of finite element analysis and dynamic simulation can be improved.
Fig. 3 and fig. 4 are images of the change of the material characteristic value of each flexible interconnection system along with the material density of each flexible interconnection system region, where the x-axis represents the material density of each flexible interconnection system region, the y-axis represents the material characteristic value of each flexible interconnection system, so as to help intuitively understand how the material density of each flexible interconnection system region affects the material characteristic value of each flexible interconnection system, the larger the material density of each flexible interconnection system region is, the smaller the material characteristic value of each flexible interconnection system is, along with the increase of the material density of each flexible interconnection system region, the influence of the material density of each flexible interconnection system region on the material characteristic value of each flexible interconnection system is gradually weakened, i=1, the material elastic modulus of each flexible interconnection system region is 0.1, the material poisson ratio of each i flexible interconnection system region is 0.5, the compensation factor of the material elastic modulus of each i flexible interconnection system region is set to be 10, the compensation factor of the material poisson ratio of each i flexible interconnection system region is set to be 2, the compensation factor of the material density of each flexible interconnection system region is set to be 0.01, the material density of each flexible interconnection system region is only changed, and the material density of each flexible interconnection system region is shown as an example:
table 1: example values of material density of each flexible interconnection system region in material characteristic values of each flexible interconnection system
The setting is that、、The compensation factors of the (a) are obtained from a database, and the elastic modulus of the material in the region of the ith flexible interconnection system, the Poisson ratio of the material in the region of the ith flexible interconnection system, the density and the density of the material in the region of the ith flexible interconnection system are measured according to historical data、、To obtain the current mapping set of the compensation factors、、A corresponding compensation factor. Hereinafter, it is described that、、、、、The corresponding compensation factors are obtained through the mapping set of the historical data and the compensation factors established in the database, namely, the corresponding compensation factors are obtained according to the current data.
And applying environmental conditions based on the simulation analysis of the flexible interconnection system areas, and analyzing the strength of the mechanical connectors of the flexible interconnection system areas to obtain the strength characteristic values of the flexible interconnection system areas. The specific analysis process is as follows: acquiring a strength data set of mechanical connectors of each flexible interconnection system region, wherein the strength data set of the mechanical connectors of each flexible interconnection system region specifically comprises absolute values of differences between tensile strength and reference tensile strength of each flexible interconnection system region, absolute values of differences between yield strength and reference yield strength of each flexible interconnection system region and absolute values of differences between compressive strength and reference compressive strength of each flexible interconnection system region; and comprehensively analyzing to obtain the regional intensity characteristic values of the flexible interconnection systems based on the acquired regional mechanical connector intensity data sets of the flexible interconnection systems, wherein the regional intensity characteristic values of the flexible interconnection systems are used as analysis basis for determining the qualification grade of the flexible interconnection systems.
The tensile strength refers to the maximum stress born by the material in the stretching process, namely the maximum tensile force born by the material before fracture, the reference tensile strength is a preset standard value or reference value, usually the design requirement or industry standard, and the tensile strength is obtained based on a universal material testing machine; the yield strength is the maximum stress that the material can bear before plastic deformation occurs, namely the stress when the material starts to generate permanent deformation, the yield strength is a yield strength value specified by design or standard by reference to the yield strength, and the yield strength is obtained based on a tensile testing machine; compressive strength refers to the maximum stress that a material can withstand under compression, and is generally used to describe the load carrying capacity of a material under compressive load, and is obtained based on a compression tester with reference to a compressive strength value specified in the design or standard.
Yield strength is the stress at which a material begins to plastically deform, while tensile strength is the maximum stress that a material can withstand before breaking, and is generally higher than yield strength, and under tensile and compressive loads, the material behaves differently, and for some materials (such as metals or composites), the tensile and compressive strengths may be similar; however, for some brittle materials (such as concrete or ceramics) the compressive strength is generally much higher than the tensile strength, and the material generally exhibits a higher strength under compression, but the occurrence of a yield point means that the material will deform irreversibly when the load increases to some extent, and if the difference in yield strength is large, it may be indicative that the material will enter the plastic deformation stage earlier under compression or tensile load, affecting its compressive properties.
The difference between the tensile strength, the yield strength and the compressive strength of each flexible interconnection system area and the reference strength is calculated, the difference between the actual material and the design standard or the reference value can be accurately reflected, the strength difference of each area can reveal the area with insufficient strength or excessive strength in the flexible interconnection system, the area with lower strength can be subjected to reinforced design, or the material use is optimized in the area with excessive strength, so that unnecessary excessive design is avoided, and the overall performance and cost efficiency of the system are improved; the differences of the tensile strength, the yield strength and the compressive strength with the reference value are analyzed, the possible areas with insufficient strength can be found in advance, corresponding improvement measures are taken, and the system failure or damage caused by insufficient strength in actual use is avoided; different flexible interconnection system areas can bear different loads or working conditions, and through analyzing the intensity data of each area, a designer can be helped to know the performance of each area under different working conditions, and the evaluation accuracy of the qualification grade can be improved.
The regional intensity characteristic values of each flexible interconnection system are obtained by the following formulas:
；
In the formula, For the i-th flexible interconnect system area strength characteristic,The absolute value of the difference between the tensile strength of the ith flexible interconnect system area and the reference tensile strength,The absolute value of the difference between the yield strength of the ith flexible interconnect system area and the reference yield strength,Is the absolute value of the difference between the compressive strength of the ith flexible interconnect system area and the reference compressive strength,To be set upIs used for the compensation factor of (a),To be set upIs used for the compensation factor of (a),To be set upIs used for the compensation factor of (a).
The absolute value of the difference between the intensity and the reference value is calculated, the deviation between the actual intensity of each region and the design standard can be accurately quantified, compared with the direct use of the intensity value, whether the system performance meets the expected standard can be more intuitively reflected by the absolute value of the difference, whether the performance of the material meets the design requirement can be directly displayed by the intensity characteristic value, and the rapid discovery of the region with potential risks in the system can be facilitated; by analyzing the differences of tensile strength, yield strength and compressive strength, the system can be ensured to bear corresponding loads under various working conditions, structural failure is avoided, each region in the system can be accurately evaluated, and therefore the strength of the whole system is ensured to be reliable enough.
And analyzing the vibration state of the flexible interconnection system area structure based on the environmental conditions applied by the simulation analysis of the flexible interconnection system areas to obtain the characteristic value of the vibration state of the flexible interconnection system areas. The specific analysis process is as follows: acquiring a vibration state data set of a regional structure of each flexible interconnection system, wherein the vibration state data set of the regional structure of each flexible interconnection system specifically comprises an absolute value of a difference value between natural frequency and reference natural frequency of each flexible interconnection system region, amplitude of each flexible interconnection system region and damping ratio of each flexible interconnection system region; based on the obtained vibration state data set of the area structure of each flexible interconnection system, comprehensively analyzing to obtain the vibration state characteristic value of the area of each flexible interconnection system, wherein the vibration state characteristic value of the area of each flexible interconnection system is used as an analysis basis for determining the qualification grade of the flexible interconnection system.
The absolute value of the difference between the natural frequency of each flexible interconnection system region and the reference natural frequency is the difference between the actual natural frequency and the reference natural frequency, and reflects whether the vibration characteristics of the system meet the design requirements; the natural frequency refers to the frequency of the system when the system freely vibrates without external drive, reflects the natural vibration characteristic of the system, and obtains the actual natural frequency based on the laser Doppler vibration instrument; the amplitude of each flexible interconnection system area is the maximum displacement in the vibration process, represents the intensity of vibration, and is obtained based on a laser Doppler vibration instrument; the damping ratio of each flexible interconnection system area is a parameter for measuring the damping rate of vibration energy of the system, the larger the damping ratio is, the faster the vibration energy is damped, the vibration is stopped, the smaller the damping ratio is, the vibration can last for a longer time, the damping rate of the vibration energy is represented, the vibration dissipation capacity of the system is measured, and the vibration dissipation capacity is obtained based on a vibration exciter and an accelerometer.
The damping ratio influences the amplitude and the vibration damping speed, and a higher damping ratio can inhibit the amplitude and accelerate the vibration damping, and particularly when the system is close to resonance, the amplitude is directly related to the damping ratio, and the larger the damping ratio is, the smaller the amplitude is.
The absolute value, the amplitude and the damping ratio of the natural frequency difference are analyzed, so that the vibration behaviors of the flexible interconnection system under different conditions can be accurately evaluated, and particularly, the difference of the natural frequency difference can reflect the difference between the system and the design standard, so that the system is ensured not to have resonance problems, and the stability of the dynamic performance of the system is ensured; the deformation range of the system under dynamic load can be determined by analyzing the amplitude, so that the influence of excessive vibration amplitude on the structural integrity is avoided, and fatigue failure or early damage of the system can be caused by excessive amplitude; the stability of the system can be ensured, the service life of the system is prolonged, the damping ratio reflects the energy dissipation capacity of the system, namely the vibration attenuation speed, and the vibration resistance of the system can be optimized, the duration time of vibration is reduced, the vibration resistance of the system is improved, and fatigue damage caused by long-term vibration is prevented through the comprehensive analysis of the damping ratio; the introduction of the vibration state characteristic value can quantify the dynamic performance of the flexible interconnection system, help a designer to grade the system according to specific vibration characteristic data, ensure that the system meets the established design standard or industry specification, and clearly judge whether the system meets the qualification requirement by comparing the natural frequency difference value, the amplitude and the damping ratio.
The vibration state characteristic value of each flexible interconnection system area is obtained by the following formula:
；
In the formula, For the i-th flexible interconnect system region vibration state characteristic value,The absolute value of the difference between the natural frequency of the ith flexible interconnect system region and the reference natural frequency,For the i-th flexible interconnect system area amplitude,For the i-th flexible interconnect system area damping ratio,To be set upIs used for the compensation factor of (a),To be set upIs used for the compensation factor of (a),To be set upE is a natural constant.
The absolute value of the difference between the natural frequency and the reference frequency can help predict whether the system is close to a resonance state, if the difference is too small, the system can be in a dangerous resonance interval, so that the amplitude is increased, and structural damage can be caused; the calculation of the characteristic value of the vibration state is combined with the natural frequency, the amplitude and the damping ratio, so that a designer can be helped to more accurately adjust the dynamic performance of the system, so that the dynamic response is stable under the actual working condition, and if the amplitude of the system is overlarge or the vibration frequency is close to the resonance frequency, fatigue damage or material failure can be caused by long-term vibration; through calculating the vibration state characteristic value, can help the designer to discern the high risk area, carry out design optimization in advance, prevent that the system from appearing fatigue failure in vibration, combine the analysis of amplitude, damping ratio and natural frequency, can ensure that the system can both keep stable vibration performance and improve emulation efficiency under different operating conditions.
And determining the qualification grade of the flexible interconnection system by combining the intensity characteristic value of each flexible interconnection system area and the vibration state characteristic value of each flexible interconnection system area. The specific analysis process is as follows: importing the intensity characteristic values of the flexible interconnection system areas and the vibration state characteristic values of the flexible interconnection system areas into a flexible interconnection system grade analysis model to obtain flexible interconnection system grade analysis characteristic values, wherein the flexible interconnection system grade analysis characteristic values are used as analysis basis for determining the qualified grade of the flexible interconnection system; and storing the grade analysis characteristic value of the flexible interconnection system as a designated label, and comparing the designated label with the qualified grade of the flexible interconnection system corresponding to each designated label stored in a database to obtain the qualified grade of the flexible interconnection system corresponding to the designated label.
The mechanical performance and the dynamic behavior of the flexible interconnection system can be comprehensively evaluated by combining the intensity characteristic value and the vibration state characteristic value, the intensity characteristic value reflects the bearing capacity of the system under different loads, the vibration state characteristic value reveals the dynamic response and the stability of the system, and the combination of the intensity characteristic value and the vibration state characteristic value can more comprehensively reflect the overall performance of the system, so that the grade evaluation is more accurate; under certain conditions, the dynamic performance of the system can be reduced by improving the strength, the optimal balance point between the strength and the vibration performance can be found through comprehensive analysis, the system is ensured to have enough bearing capacity and good dynamic stability, the grade analysis characteristic value obtained by the analysis model is based on a specific data result, and compared with the method which only depends on experience or single performance index, the method is more objective, and the human judgment error is avoided; by comprehensively considering the intensity and vibration characteristics, the reliability and the safety of the system can be more comprehensively evaluated, even if the intensity of a certain area is higher, if the vibration performance is poor, the potential failure risk can be caused, and the characteristic value is analyzed through the grade, so that the overall safety of the system is improved.
The flexible interconnection system grade analysis model comprises the following specific formulas:
；
In the formula, And analyzing the characteristic value for the flexible interconnection system level.
The intensity characteristic value and the vibration state characteristic value are combined for calculation, so that the overall mechanical property and the dynamic behavior of the system can be comprehensively reflected, the intensity characteristic value provides the bearing capacity of the system under different loads, the vibration state characteristic value reflects the stability and the vibration resistance of the system under dynamic conditions, the performance of the system can be comprehensively measured, and the limitation caused by single-dimension analysis is avoided.
The comprehensive analysis of the intensity and the vibration state characteristic value can identify the areas needing to be optimized in the system, certain areas possibly have excellent intensity, but have poor vibration performance, the comprehensive analysis can help the designer to purposefully adjust the design, optimize the materials or the structure to improve the overall performance, and the combination intensity and the vibration characteristic are analyzed, so that the fatigue performance of the system under long-term vibration or repeated load can be better evaluated; the grade analysis characteristic value can automatically evaluate the qualification grade of the system by integrating the intensity and vibration state characteristics, and the qualification grade of the system can be rapidly determined by taking the characteristic value as an evaluation basis, so that the error and subjectivity of human evaluation are reduced.
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