Computer-aided design method for experiment table

Abstract

The invention belongs to the field of computer-aided design, and provides a computer-aided design method and system for an experiment table, and the method comprises the following steps: constructing a three-dimensional model of the experiment table; loading the three-dimensional model of the experiment table into finite element analysis software, and performing mesh generation on the three-dimensional model of the experiment table through a mesh generation algorithm to obtain an experiment table finite element model; identifying a support column area of the experiment table finite element model to obtain a support column area finite element model; a vibration danger area is screened out through the support instability area; and marking the position, corresponding to the three-dimensional model of the experiment table, of the vibration danger area. According to the auxiliary design method provided by the embodiment of the invention, the problem of support instability caused by vibration in the experiment process of the experiment table can be solved, the stability of the experiment table in the experiment process is improved, and the influence on the experiment operation or the experiment result due to the support instability problem in the experiment process is avoided.

Description

Technical Field

[0001] The present invention belongs to the field of computer-aided design, and particularly relates to a computer-aided design method for a test bench. Background Art

[0002] In the design and application of test benches, especially in complex experimental environments such as industry and scientific research, test benches often need to withstand external or internal vibration loads. The sources of vibration may come from various factors, such as the operation of machinery and equipment, external mechanical vibration, seismic waves, etc. These vibrations usually have different frequencies and intensities. Due to the periodicity and uncertainty of vibrations, the dynamic response of test benches in such environments is particularly important.

[0003] The support columns of the test bench, as an important part of the load-bearing and stabilizing structure, bear the load of the entire structure. Under the action of vibration, the support column area will experience periodic displacement and deformation. These dynamic loads will have a great impact on the support column area. Especially in the case of some high-frequency vibrations or long-term vibrations, stress concentration may occur in the support column area. This stress concentration effect may cause structural instability in local areas. If the support column is unstable, it will directly affect the stability and accuracy of the test bench, and may even lead to structural failure of the entire test bench and equipment damage in severe cases. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, the object of the present invention is to provide a computer-aided design method for a test bench, which can solve the problem of support instability of the test bench due to vibration during the experiment, improve the stability of the test bench during the experiment, and avoid the influence of experimental operations or experimental results due to support instability problems during the experiment;

[0005] To achieve the above object, an embodiment of the present invention provides a computer-aided design method for a test bench, and the method includes the following steps:

[0006] S100, constructing a three-dimensional model of the test bench;

[0007] S200, loading the three-dimensional model of the test bench into finite element analysis software, and performing mesh division on the three-dimensional model of the test bench through a mesh division algorithm to obtain a finite element model of the test bench;

[0008] S300, identifying the support column area of the finite element model of the test bench to obtain a finite element model of the support column area;

[0009] S400, performing vibration frequency strain morphology analysis according to the obtained finite element model of the support column area, obtaining the support instability area, and screening out the vibration risk area through the support instability area;

[0010] S500, mark the position of the 3D model of the test bench corresponding to the vibration-risk area.

[0011] According to the auxiliary design method of the embodiment of the present invention, the problem of unstable support caused by vibration during the experiment of the test bench can be solved, the stability of the test bench during the experiment can be improved, and the experimental operation or experimental results can be prevented from being affected due to the problem of unstable support during the experiment.

[0012] Further, in step S100, the 3D model of the test bench is a 3D model obtained by scanning the test bench with a 3D scanner, wherein the test bench includes the multi-functional test bench proposed in Patent No. CN221514572U.

[0013] Further, in step S200, the method of loading the 3D model of the test bench into a finite element analysis software and performing mesh division on the 3D model of the test bench through a mesh division algorithm to obtain a finite element model of the test bench includes: loading the 3D model of the test bench into a finite element analysis software and performing mesh division on the 3D model of the test bench through a mesh division algorithm to obtain a finite element model of the test bench, wherein the type of the mesh is a tetrahedral mesh.

[0014] Further, in step S300, the method of identifying the support column area of the finite element model of the test bench and obtaining the finite element model of the support column area includes:

[0015] Identifying the support column area of the finite element model of the test bench through geometric analysis and material property analysis, determining its boundary by marking the area of interest, and marking the finite element model of the support column area.

[0016] In a complex experimental environment, the experimental table is often subjected to vibrations of different frequencies and intensities. These vibrations may cause stress concentration in the support column area, which may in turn lead to support instability. If these stress concentration areas are not discovered and addressed in a timely manner, it is very likely that support instability will be triggered under the action of vibrations, thereby affecting the overall stability and use safety of the experimental table during the experiment. Especially for an experimental table used for precision optical experiments, when high-precision instrument equipment such as a laser interferometer is installed on the experimental table, the experimental table needs to maintain extremely high stability to ensure the accuracy and reliability of experimental data. In this case, if the experimental table is affected by strong vibrations, especially when the vibration frequency is close to the natural frequency of the support column, it will exacerbate the stress concentration in the support column. When the vibration frequency is also exactly within the natural frequency range of the support column, the vibration will cause excessive local deformation or micro-cracks in the support column, resulting in instability in the support column area, and it will gradually worsen over time, ultimately leading to the fracture instability of the support column and the displacement or deviation of the experimental equipment, and finally resulting in deviations in the experimental results or the inability to conduct the experiment. Therefore, in this experimental environment, to solve the above problems, it is necessary to analyze the vibration frequency strain morphology and comprehensively consider the influence of vibration effects on the support column area, more accurately identify the stress anomalies caused by vibrations, and perform structural corrections based on the stress anomaly conditions to avoid structural failures caused by vibrations. For this reason, the present invention proposes step S400.

[0017] Further, in step S400, vibration frequency strain morphology analysis is performed based on the obtained finite element model of the support column area to obtain the support instability area, and the vibration-risk area is screened out through the support instability area, including:

[0018] S401, perform a simulation analysis of the structural vibration of the experimental table finite element model through finite element analysis software to obtain the maximum stress when the experimental table and the support column area of the experimental table are subjected to bending deformation; record the average value of the maximum stress received by all meshes of the experimental table finite element model as LM1;

[0019] S402, use LEss(i) to represent the maximum stress of the mesh in the i-th support column area finite element model, where i ∈ [1, n], where n is the number of meshes in the support column area finite element model, and the maximum stress of the mesh is the average value of the maximum stress received within the entire mesh; record the maximum value of the average value of the maximum stress received by all meshes in the support column area of the experimental table as LM2;

[0020] S403, define an integer variable k, set the initial value to 1, create two variables LEK1 and LEK2 that are initially zero, and create two blank sequences FP for subsequent calculations and comparisons;

[0021] S404. Conduct a vibration frequency strain morphology analysis on the mesh in the finite element model of the support column area. The vibration frequency strain morphology analysis is as follows: Calculate the values of LEK1 and LEK2, where: Let the value of LEK1 be the absolute value of the difference between LEss(k) and LM1, and let the value of LEK2 be the absolute value of the difference between LEss(k) and LM2; Compare the values of LEK1 and LEK2: If LEK1 is greater than LEK2, then add LEss(k) to the sequence FP.

[0022] S405. Determine whether the vibration frequency strain morphology analysis is completed. The specific determination method is as follows: If the current variable k is less than n, then increment k by 1 and return to step S403 to continue the vibration frequency strain morphology analysis; If the current variable k is equal to n, it means that the vibration frequency strain morphology analysis has been processed and completed and transfer to step S406.

[0023] Where n is the number of meshes in the finite element model of the support column area.

[0024] Specifically, the principle of the vibration frequency strain morphology analysis is to study the response behavior of the test bench under external vibration or self-excited vibration. In the application of a specific test bench, the vibration frequency strain morphology analysis conducts an in-depth analysis of the support column area. Since the support column is a key load-bearing structure of the test bench, its instability may lead to the collapse of the entire test bench structure. By conducting a vibration frequency strain morphology analysis on the support column area, the stress response of each part of the support column for each mesh can be calculated, and whether there are abnormal stress meshes can be judged based on the maximum stress, thereby locating the support instability area.

[0025] The beneficial effect of this step is as follows: Simulate the vibration characteristics, stress distribution, and instability mode of the structure through finite element analysis software, and then analyze the stability and safety of the structure in a vibrating environment. Under the simulation analysis of the structural vibration of the finite element analysis software, the structure will resonate at specific frequencies when subjected to external vibration, that is, the vibration amplitude of the test bench structure will increase significantly at these frequencies, leading to instability or damage, and the generated stress will reflect the sensitivity of the test bench structure to external vibration. Since stress is the main response of the structure during vibration, excessive stress will cause material damage or local instability. Therefore, by obtaining the stress distribution of the support structure of the test bench, it can be analyzed which positions are more severely unstable, and by comparing the differences between the maximum stress of different meshes in the support area and the average value LM1 of the maximum stress received by all meshes of the test bench finite element model and the maximum value LM2 of the maximum stress received by all meshes in the support column area of the test bench, it is determined whether there is a potential support instability risk in the support area. If the maximum stress of the mesh deviates significantly from LM1 but is close to LM2, it indicates that there may be an instability risk in this area.

[0026] S406. Denote the grids corresponding to all elements in the sequence FP as abnormal stress grids, denote the area composed of all abnormal stress grids as the support instability area, and obtain the first collapse instability line, the second collapse instability line, and the third collapse instability line.

[0027] Specifically, take the center points PLEK1 and PLEK2 of the two grids with the farthest distance in the support instability area, denote the line segment between the points PLEK1 and PLEK2 as the first collapse instability line L1, and take the midpoint PLEK3 of L1; calculate the distances between the center points of all grids in the support instability area and the center point of the grid with the maximum stress LM2 in the support instability area, connect the center points of the corresponding grids with the longest distance and the center point of the grid with the maximum stress LM2, and mark the midpoint of this line segment as PLEK4; obtain the center point of the grid in the support instability area with the maximum stress closest to (LM1 + LM2) / 2 and mark it as PLEK5; denote the line segment between the points PLEK3 and PLEK4 as the second collapse instability line L2, and denote the line segment between the points PLEK3 and PLEK5 as the third collapse instability line L3.

[0028] Furthermore, the first collapse instability line, the second collapse instability line, and the third collapse instability line are based on the grid analysis of the support instability area. By further refining the support instability area through geometric features and stress analysis, potential instability risk areas can be calibrated. By analyzing the relative positions and maximum stresses between the grids in the support instability area, collapse instability lines are constructed to evaluate the stability of the support columns and further reveal the abnormal dynamic behavior of the support instability area.

[0029] Furthermore, the principle of constructing the collapse instability line L1 is to calculate the distances between the center points of all grids within the support instability area, find the two center points PLEK1 and PLEK2 of the grids with the farthest distance within the support instability area. The connecting line segment of the two farthest center points represents the maximum stress expansion direction of the support instability area and is also the most severe direction of the instability of the support columns of the test bench. And the midpoint PLEK3 of L1 represents a key concentration position in the support instability area, which is the position where the structural center of gravity instability occurs.

[0030] Furthermore, since LM2 represents the maximum stress of all grids within the support column area, the grid with the maximum stress LM2 is the area with the most concentrated stress, indicating that this part is more likely to become unstable under external vibration.

[0031] Furthermore, the second collapse instability line L2 represents the secondary instability path or area within the support instability area. Its function is to supplement the main instability direction (L1) and point out other possible instability paths in the support column area under the action of vibration and stress.

[0032] Furthermore, selecting the grid center point PLEK5 with stress close to the average of LM1 and LM2 can further refine the instability region, identify the region between different vibration modes, especially the grids within the stress range between LM1 and LM2, indicating that the grids are in a critical instability state under vibration conditions. Construct the third collapse instability line L3 based on points PLEK3 and PLEK5, indicating another important potential instability path in the support instability region.

[0033] S407, calculate the average vibration amplitude of the first collapse instability line, the second collapse instability line, and the third collapse instability line and obtain the vibration-dangerous region;

[0034] Perform a simulation analysis of the structural vibration of the finite element model of the support column region through finite element analysis software, and obtain the vibration amplitude of the grids in the finite element model of the support column region, where the vibration amplitude of the grid is the average value of the vibration amplitudes received within the entire grid; the vibration amplitude is the maximum displacement of an object from the equilibrium position during the vibration cycle;

[0035] Record the average value of the vibration amplitudes of all the grids passed by the first collapse instability line as Tp1, record the average value of the vibration amplitudes of all the grids passed by the second collapse instability line as Tp2, and record the average value of the vibration amplitudes of all the grids passed by the third collapse instability line as Tp3;

[0036] Calculate the vibration amplitude offset difference Tpk = (|Tp1 - Tp2| + |Tp2 - Tp3| + |Tp3 - Tp1|) × 3 ÷ (Tp1 + Tp2 + Tp3), and the balanced vibration amplitude JHYR = (Tp1 + Tp2 + Tp3) / 3. Mark the grids with vibration amplitudes greater than (JHYR - Tpk) among all the grids passed by the first collapse instability line, all the grids passed by the second collapse instability line, and all the grids passed by the third collapse instability line as vibration-dangerous grids, and record the region composed of all the vibration-dangerous grids as the vibration-dangerous region.

[0037] Specifically, Tpk is the offset difference of the vibration amplitude, which is used to measure the degree of difference between the vibration amplitudes of the three instability lines (L1, L2, L3), reflecting the difference characteristics of the unevenness of the vibration amplitudes of the three collapse instability lines. If the vibration amplitude differences of the three collapse instability lines are large, it indicates that the vibration characteristics of the support structure of the test bench are unbalanced and there is a greater risk of instability; JHYR is the balanced average value of the vibration amplitudes of the three collapse instability lines, representing the overall vibration level of the support region.

[0038] The beneficial effect of this step is that by calculating the vibration amplitude offset difference and the balanced vibration amplitude, the vibration imbalance situation can be dynamically quantified, and based on this, the grids with abnormal vibration amplitudes can be calibrated, ensuring that potential vibration-dangerous regions can be discovered in advance, providing a basis for further optimization design and structural reinforcement.

[0039] Further, in step S500, the method for marking the position of the three-dimensional model of the experimental bench corresponding to the vibration-risk area includes:

[0040] Through the grid of the vibration-risk area, calibrate the position corresponding to the vibration-risk area in the three-dimensional model of the experimental bench, map the vibration-risk area to the corresponding part of the three-dimensional model of the experimental bench. Through this marking, it can be clearly known which positions of the three-dimensional model of the experimental bench will be affected by the vibration-risk area of the experimental bench.

[0041] To enhance the anti-seismic ability of the experimental bench and the stability of the support column area, the preferred method is to fill the inner cavity of the identified vibration-risk area with a non-Newtonian fluid damping material (shear thickening liquid) to increase the structural damping ratio. The unique properties of the non-Newtonian fluid damping material enable it to provide a dynamic damping effect when subjected to vibration, thereby enhancing the stability of the support column. When the experimental bench is in an environment with strong vibrations, the vibration-risk area may be subjected to periodic or non-periodic vibration interference, resulting in structural resonance or local stress concentration. At this time, if the inner cavity of the support column is filled with a non-Newtonian fluid, the viscosity of the fluid will increase under the action of vibration, thereby providing additional resistance, absorbing part of the vibration energy, and reducing the vibration transmission and amplification effects.

[0042] Specifically, when an external shear force (such as vibration) acts on the shear thickening liquid, the viscosity of the shear thickening liquid will increase significantly, which means that the stronger the vibration, the more obvious the damping effect. In this way, the support column of the experimental bench can better resist vibration and reduce the risk caused by support instability. In addition, the flow characteristics of the non-Newtonian fluid enable it to effectively disperse the vibration energy, avoid excessive stress concentration in the vibration-risk area, and thus improve the overall structural stability.

[0043] The beneficial effects of the present invention are as follows: It solves the problem of support instability of the experimental bench during the experiment due to vibration, improves the stability of the experimental bench during the experiment, and avoids the influence of experimental operations or experimental results due to the support instability problem during the experiment.

[0044] To achieve the above object, the second aspect embodiment of the present invention also proposes an experimental bench computer-aided design system. The experimental bench computer-aided design system includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in an experimental bench computer-aided design method. The experimental bench computer-aided design system runs on computing devices such as satellites, desktop computers, notebooks, palm computers, and cloud data centers.

[0045] By implementing a computer-aided design method for a test bench using a computer-aided design system for the test bench, the problem of support instability caused by vibration during the experiment of the test bench can be solved, the stability of the test bench during the experiment can be improved, and the experimental operation or experimental results can be prevented from being affected due to the support instability problem during the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The figure shows a flowchart of a computer-aided design method for a test bench. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0048] Figure 1 The figure shows a flowchart of a computer-aided design method for a test bench.

[0049] Referring to Figure 1 , the present invention provides a computer-aided design method for a test bench, the method comprising the following steps:

[0050] S100, constructing a three-dimensional model of the test bench;

[0051] S200, loading the three-dimensional model of the test bench into finite element analysis software, and performing mesh division on the three-dimensional model of the test bench through a mesh division algorithm to obtain a finite element model of the test bench;

[0052] S300, identifying the support column area of the finite element model of the test bench to obtain a finite element model of the support column area;

[0053] S400, performing vibration frequency strain morphology analysis according to the obtained finite element model of the support column area, obtaining the support instability area, and screening out the vibration critical area through the support instability area;

[0054] S500, marking the position of the three-dimensional model of the test bench corresponding to the vibration critical area.

[0055] According to the auxiliary design method of the embodiment of the present invention, the problem of support instability caused by vibration during the experiment of the test bench can be solved, the stability of the test bench during the experiment can be improved, and the experimental operation or experimental results can be prevented from being affected due to the support instability problem during the experiment.

[0056] Further, in step S100, the three-dimensional model of the experimental bench is a three-dimensional model obtained by scanning the experimental bench with a three-dimensional scanner, where the experimental bench includes the multi-functional experimental bench proposed in Chinese Patent No. CN221514572U.

[0057] Further, in step S200, the method of loading the three-dimensional model of the experimental bench into a finite element analysis software and performing mesh division on the three-dimensional model of the experimental bench through a mesh division algorithm to obtain a finite element model of the experimental bench includes: loading the three-dimensional model of the experimental bench into the finite element analysis software and performing mesh division on the three-dimensional model of the experimental bench through a mesh division algorithm to obtain a finite element model of the experimental bench, where the type of the mesh is a tetrahedral mesh.

[0058] Further, in step S300, identifying the support column area of the finite element model of the experimental bench and obtaining a finite element model of the support column area includes:

[0059] Identifying the support column area of the finite element model of the experimental bench through geometric analysis and material property analysis, determining its boundary by marking the area of interest, and marking the finite element model of the support column area.

[0060] In a complex experimental environment, the experimental bench is often subjected to vibrations of different frequencies and intensities. These vibrations may cause stress concentration in the support column area, which may further lead to support instability. If these stress concentration areas are not discovered and processed in time, it is very likely that support instability will be caused under the action of vibrations, which will further affect the overall stability and use safety of the experimental bench during the experiment, especially for an experimental bench used for precision optical experiments, and high-precision instrument equipment such as a laser interferometer is installed on the experimental bench; at this time, the experimental bench needs to maintain extremely high stability to ensure the accuracy and reliability of experimental data. To solve the above problems, it is necessary to analyze the vibration frequency strain morphology and comprehensively consider the influence of the vibration effect on the support column area to more accurately identify the stress anomalies caused by vibrations, and perform structural correction through the stress anomaly situation to avoid structural failures caused by vibrations. Therefore, step S400 is proposed in the present invention.

[0061] Further, in step S400, performing vibration frequency strain morphology analysis according to the obtained finite element model of the support column area, obtaining the support instability area, and screening out the vibration-dangerous area through the support instability area includes:

[0062] S401, performing a simulation analysis of the structural vibration of the finite element model of the experimental bench through the finite element analysis software to obtain the maximum stress when the experimental bench and the support column area of the experimental bench are subjected to bending deformation; recording the average value of the maximum stress received by all meshes of the finite element model of the experimental bench as LM1;

[0063] S402. Denote the maximum stress of the mesh in the finite element model of the \(i\)-th support column region as \(LEss(i)\), where \(i\in[1, n]\), \(n\) is the number of meshes in the finite element model of the support column region, and the maximum stress of the mesh is the average value of the maximum stresses received within the entire mesh. Denote the maximum value of the average value of the maximum stresses received by all meshes in the support column region of the test bench as \(LM2\).

[0064] S403. Define an integer variable \(k\) with an initial value set to 1. Create two variables \(LEK1\) and \(LEK2\) initialized to zero, and create two empty sequences \(FP\) for subsequent calculations and comparisons.

[0065] S404. Conduct a vibration frequency strain morphology analysis on the meshes in the finite element model of the support column region. The vibration frequency strain morphology analysis is as follows: Calculate the values of \(LEK1\) and \(LEK2\), where: Let the value of \(LEK1\) be the absolute value of the difference between \(LEss(k)\) and \(LM1\), and let the value of \(LEK2\) be the absolute value of the difference between \(LEss(k)\) and \(LM2\). Compare the values of \(LEK1\) and \(LEK2\): If \(LEK1\) is greater than \(LEK2\), then add \(LEss(k)\) to the sequence \(FP\).

[0066] S405. Determine whether the vibration frequency strain morphology analysis is completed. The specific determination method is as follows: If the current variable \(k\) is less than \(n\), then increment \(k\) by 1 and return to step S403 to continue the vibration frequency strain morphology analysis; If the current variable \(k\) is equal to \(n\), it means that the vibration frequency strain morphology analysis has been processed and completed and proceed to step S406.

[0067] The principle of the vibration frequency strain morphology analysis is to study the response behavior of the test bench under external vibration or self-excited vibration. In the application of a specific test bench, the vibration frequency strain morphology analysis conducts in-depth analysis on the support column region. Since the support column is a key load-bearing structure of the test bench, its instability may lead to the collapse of the entire test bench structure. By conducting the vibration frequency strain morphology analysis on the support column region, the stress response of each part of each grid support column can be calculated, and whether there are abnormal stress meshes can be judged based on the maximum stress to locate the support instability region.

[0068] S406. Denote the meshes corresponding to all elements in the sequence \(FP\) as abnormal stress meshes. Denote the region composed of all abnormal stress meshes as the support instability region, and obtain the first collapse instability line, the second collapse instability line, and the third collapse instability line.

[0069] Specifically, take the center points PLEK1 and PLEK2 of the two grids with the farthest distance in the support instability region. Denote the line segment between points PLEK1 and PLEK2 as the first collapse instability line L1, and take the midpoint PLEK3 of L1; calculate the distances between all the center points of the grids in the support instability region and the center point of the grid with the maximum stress LM2 in the support instability region, connect the corresponding grid center point with the longest distance and the center point of the grid with the maximum stress LM2, and mark the midpoint of this line segment as PLEK4; obtain the grid center point in the support instability region with the maximum stress closest to (LM1 + LM2) / 2 and mark it as PLEK5; denote the line segment between points PLEK3 and PLEK4 as the second collapse instability line L2, and denote the line segment between points PLEK3 and PLEK5 as the third collapse instability line L3;

[0070] Furthermore, the first collapse instability line, the second collapse instability line, and the third collapse instability line are based on the grid analysis of the support instability region. By further refining the support instability region through geometric features and stress analysis, potential instability risk regions can be calibrated. By analyzing the relative positions and maximum stresses among the grids in the support instability region, collapse instability lines are constructed to evaluate the stability of the support columns and further reveal the abnormal dynamic behavior of the support instability region.

[0071] Furthermore, the principle of constructing the collapse instability line L1 is to calculate the distances between the center points of all the grids in the support instability region, find the two grid center points PLEK1 and PLEK2 with the farthest distance in the support instability region. The connecting line segment of the two farthest grid center points represents the maximum stress expansion direction of the support instability region and is also the most severe direction of the instability of the test bench support column. And the midpoint PLEK3 of L1 represents a key concentrated position in the support instability region, which is the position where the structural center of gravity instability occurs.

[0072] Furthermore, since LM2 represents the maximum stress of all the grids in the support column region, the grid with the maximum stress LM2 is the region with the most concentrated stress, indicating that this part is more likely to become unstable under external vibration.

[0073] Furthermore, the second collapse instability line L2 represents the secondary instability path or region in the support instability region. Its function is to supplement the main instability direction (L1) and point out other possible instability paths in the support column region under vibration and stress.

[0074] Furthermore, selecting the grid center point PLEK5 with stress close to the average of LM1 and LM2 can further refine the instability region and identify the region between different vibration modes. In particular, the grids within the stress range between LM1 and LM2 indicate that the grids are in a critical instability state under vibration conditions. Constructing the third collapse instability line L3 based on points PLEK3 and PLEK5 represents another important potential instability path in the support instability region.

[0075] S407, calculate the average vibration amplitude of the first collapse instability line, the second collapse instability line, and the third collapse instability line and obtain the vibration-critical region;

[0076] Perform a simulation analysis of the structural vibration of the finite element model of the support column region through finite element analysis software and obtain the vibration amplitude of the grids in the finite element model of the support column region, where the vibration amplitude of the grid is the average value of the vibration amplitudes received within the entire grid; the vibration amplitude is the maximum displacement of an object from the equilibrium position during the vibration cycle;

[0077] Record the average value of the vibration amplitudes of all the grids passed by the first collapse instability line as Tp1, record the average value of the vibration amplitudes of all the grids passed by the second collapse instability line as Tp2, and record the average value of the vibration amplitudes of all the grids passed by the third collapse instability line as Tp3;

[0078] Calculate the vibration amplitude offset difference Tpk = (|Tp1 - Tp2| + |Tp2 - Tp3| + |Tp3 - Tp1|) × 3 ÷ (Tp1 + Tp2 + Tp3), and the equilibrium vibration amplitude JHYR = (Tp1 + Tp2 + Tp3) / 3. Mark the grids with vibration amplitudes greater than (JHYR - Tpk) among all the grids passed by the first collapse instability line, the second collapse instability line, and the third collapse instability line as vibration-critical grids, and record the region composed of all the vibration-critical grids as the vibration-critical region.

[0079] Specifically, Tpk is the offset difference of the vibration amplitude, which is used to measure the degree of difference between the vibration amplitudes of the three instability lines (L1, L2, L3), reflecting the difference characteristics of the unevenness of the vibration amplitudes of the three collapse instability lines. If the difference in the vibration amplitudes of the three collapse instability lines is large, it indicates that the vibration characteristics of the support structure of the test bench are unbalanced and there is a greater risk of instability; JHYR is the equilibrium average value of the vibration amplitudes of the three collapse instability lines, representing the overall vibration level of the support region.

[0080] Furthermore, in step S500, the method for marking the position of the three-dimensional model of the test bench corresponding to the vibration-critical region includes:

[0081] Calibrate the corresponding positions of the vibration-dangerous area in the three-dimensional model of the test bench through the grid of the vibration-dangerous area, and map the vibration-dangerous area to the corresponding parts of the three-dimensional model of the test bench. Through this marking, it can be clearly known which positions of the three-dimensional model of the test bench will be affected by the vibration-dangerous area of the test bench.

[0082] To enhance the earthquake-proof ability of the test bench and the stability of the support column area, the preferred method is to fill the inner cavity of the identified vibration-dangerous area with non-Newtonian fluid damping material (shear thickening liquid) to increase the structural damping ratio. The unique properties of the non-Newtonian fluid damping material enable it to provide a dynamic damping effect when subjected to vibration, thereby enhancing the stability of the support column. When the test bench is in an environment with strong vibrations, the vibration-dangerous area may be subjected to periodic or non-periodic vibration interference, resulting in structural resonance or local stress concentration. At this time, if the inner cavity of the support column is filled with non-Newtonian fluid, the viscosity of the fluid will increase under the action of vibration, thereby providing additional resistance, absorbing part of the vibration energy, and reducing the vibration transmission and amplification effects.

[0083] Specifically, when an external shear force (such as vibration) acts on the shear thickening liquid, the viscosity of the shear thickening liquid will increase significantly, which means that the stronger the vibration, the more obvious the damping effect. In this way, the support column of the test bench can better resist vibration and reduce the risk caused by support instability. In addition, the flow characteristics of the non-Newtonian fluid enable it to effectively disperse the vibration energy and avoid excessive stress concentration in the vibration-dangerous area, thereby improving the overall structural stability.

[0084] Note that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in combination with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of the computer-readable medium include the following: an electrical connection portion having one or more wirings (electronic device), a portable computer diskette case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0085] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having suitable combinational logic gate circuits, programmable logic arrays (PLAs), field-programmable logic arrays (FPGAs), etc.

[0086] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0087] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0088] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in this embodiment. Thus, the features defined with the terms "first", "second", etc. in the embodiments of the present invention may clearly or implicitly indicate that at least one such feature is included in this embodiment. In the description of the present invention, the meaning of the word "plurality" is at least two or more than two, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiment.

[0089] In the present invention, unless otherwise clearly specified or limited in the embodiments, the terms "mounted", "connected", "connected" and "fixed" etc. appearing in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or integrated. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements, or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific implementation circumstances.

[0090] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0091] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A computer-aided design method for a test bench, characterized in that: The method comprises the following steps: S100, constructing a three-dimensional model of the experimental platform; S200, loading the three-dimensional model of the test bench into finite element analysis software, meshing the three-dimensional model of the test bench using a meshing algorithm, and obtaining a finite element model of the test bench; S300, identifying a support column region of a finite element model of a test bench, and obtaining a finite element model of the support column region; S400, performing vibration frequency strain morphology analysis based on the obtained finite element model of the support column area, obtaining the support instability area, and screening out the vibration-critical area through the support instability area; S500: Mark the position of the three-dimensional model of the test bench corresponding to the vibration-prone area.

2. A computer-aided design method for a test bench according to claim 1, characterized in that: In step S200, the three-dimensional model of the experimental bench is loaded into the finite element analysis software, and the three-dimensional model of the experimental bench is meshed by a meshing algorithm to obtain the finite element model of the experimental bench. The method includes: loading the three-dimensional model of the experimental bench into the finite element analysis software, and meshing the three-dimensional model of the experimental bench by a meshing algorithm to obtain the finite element model of the experimental bench, wherein the type of the mesh is a tetrahedral mesh.

3. A computer-aided design method for a test bench according to claim 1, characterized in that: In step S300, the support column region of the finite element model of the test bench is identified, and obtaining the finite element model of the support column region includes: The support column area of ​​the finite element model of the test bench is identified through geometric analysis and material property analysis, its boundary is determined by marking the area of ​​interest, and the finite element model of the support column area is marked.

4. A computer-aided design method for a test bench according to claim 1, characterized in that: In step S400, a vibration frequency strain morphology analysis is performed based on the obtained finite element model of the support column area to obtain the support instability area, and the vibration-critical areas are screened out through the support instability area, including: S401, perform structural vibration simulation analysis on the finite element model of the test bench through finite element analysis software to obtain the stress on the test bench and the test bench support column area; the average value of the maximum stress on all grids of the finite element model of the test bench is recorded as LM1; S402, LEss(i) represents the maximum stress of the grid in the finite element model of the i-th support column area, where i∈[1,n], n is the number of grids in the finite element model of the support column area, and the maximum stress of the grid is the average value of the maximum stress in the entire grid; the maximum value of the average value of the maximum stress of all grids in the support column area of ​​the test bench is LM2; S403, define an integer variable k, set its initial value to 1, create two variables LEK1 and LEK2 with initial value of zero, and create two blank sequences FP for subsequent calculation and comparison; S404, performing vibration frequency strain morphology analysis on the mesh in the finite element model of the support column area, wherein the vibration frequency strain morphology analysis is as follows: calculating the values ​​of LEK1 and LEK2, wherein: setting the value of LEK1 to be the absolute value of the difference between LEss(k) and LM1, setting the value of LEK2 to be the absolute value of the difference between LEss(k) and LM2; comparing the values ​​of LEK1 and LEK2: if LEK1 is greater than LEK2, adding LEss(k) to the sequence FP; S405, judging whether the vibration frequency strain morphology analysis is completed, the specific judging method is: if the current variable k is less than n, then k is increased by 1, and the process returns to step S403 to continue the vibration frequency strain morphology analysis; if the current variable k is equal to n, then the vibration frequency strain morphology analysis has been completed and the process goes to step S406; S406, recording the grids corresponding to all elements in the sequence FP as abnormal stress grids, recording the area composed of all abnormal stress grids as the support instability area, and obtaining the first collapse instability line, the second collapse instability line and the third collapse instability line; S407, calculating the average vibration amplitudes of the first collapse instability line, the second collapse instability line, and the third collapse instability line and obtaining a vibration-critical area.

5. A computer-aided design method for a test bench according to claim 1, characterized in that: In step S500, the method for marking the position of the vibration-prone area corresponding to the three-dimensional model of the experimental platform includes: calibrating the corresponding position of the vibration-prone area in the three-dimensional model of the experimental platform through the grid of the vibration-prone area, and mapping the vibration-prone area to the corresponding part of the three-dimensional model of the experimental platform.

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