Connector finite element equivalent modeling method and device, storage medium and computer program product

Abstract

The invention discloses a connector finite element equivalent modeling method and device, a storage medium and a computer program product, which are applied to the field of servers, and the method comprises the following steps: creating a simplified model of a connector, the connector comprising a male end part and a female end part; establishing bushing connection in the simplified model based on the contact behavior of the male end part and the female end part; acquiring test results of moving rigidity and rotating rigidity of the male end part and the female end part in the plugging process and after plugging, and taking the test results as simulation parameters; and creating a simulation calculation model according to the simulation parameters and the simplified model. According to the method provided by the invention, the modeling precision of the simulation calculation model can be effectively improved, so that the calculation precision during subsequent calculation is improved, better analysis on the plugging force between the male end part and the female end part of the connector in the server is facilitated, the design of the connector is facilitated, and the use requirements of the server are met.

Description

Technical Field

[0001] The present invention relates to the field of servers, and in particular to a connector finite element equivalent modeling method and equipment, a storage medium and a computer program product. Background Art

[0002] In the server field, the connector consists of a male part and a female part. The insertion force between the two is an important indicator that affects the contact performance. When the connector has poor contact, its contact impedance increases, affecting the signal waveform, and seriously causing signal transmission failure. It is often necessary to use simulation analysis and result visualization to analyze the cause of the poor contact.

[0003] In order to improve the simulation accuracy, the simulation analysis methods used in related technologies require that a single connector be divided into numerous grids. A server may have dozens or even hundreds of connectors at most. Therefore, the number of grids for the connectors alone can reach tens of millions. In addition, when simulating vibration and impact, it is also necessary to use a dynamic explicit algorithm, which will take too long to calculate, and sometimes even make the model too large to calculate.

[0004] Therefore, how to effectively improve the accuracy and efficiency of connector finite element analysis is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a connector finite element equivalent modeling method and equipment, storage medium and computer program product, which are used to simplify the connector modeling process and improve the reliability performance and quality of server products.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A connector finite element equivalent modeling method comprises the following steps:

[0008] Create a simplified model of the connector, which includes a male part and a female part;

[0009] Based on the contact behavior of the male and female parts, the bushing connection is established in the simplified model;

[0010] Obtain the test results of the movement stiffness and rotation stiffness of the male end part and the female end part during the plugging and unplugging process and after the plugging is completed as simulation parameters;

[0011] A simulation calculation model is created based on simulation parameters and simplified models.

[0012] The connector finite element equivalent modeling method provided by the present invention has the beneficial effects of: by establishing a bushing connection in a simplified model, using the bushing to simulate the contact force between the male end part and the female end part, and using a nonlinear spring to simulate the effective contact stroke and plug-in force changes between the male and female heads; when obtaining simulation parameters, not only the movement stiffness of the male end part and the female end part during the plug-in and pull-out process and after the plug-in is completed is tested, but also the rotational stiffness of the male end part and the female end part is tested, so as to more accurately simulate the state of the connector, effectively improve the modeling accuracy of the simulation calculation model, thereby improving the calculation accuracy of subsequent calculations, which is conducive to better analysis of the plug-in force between the male end part and the female end part of the connector in the server, and better finding out the problem when the male end part and the female end part are in poor contact, which is conducive to the design of the connector and meets the use requirements of the server.

[0013] In one embodiment, the obtaining of the test results of the movement stiffness and rotational stiffness of the male end part and the female end part during the plugging process and after the plugging is completed includes: obtaining the axial nonlinear stiffness curve of the male end part and the female end part during the plugging process; obtaining the up-down direction nonlinear stiffness curve and the left-right direction nonlinear stiffness curve of the male end part and the female end part after the plugging is completed; obtaining the torque-torsion angle curve, bending moment-pitch angle curve and torque-swing angle curve of the male end part and the female end part after the plugging is completed. The above process adds stiffness measurements in three postures: torsion, pitch, and swing. This can more comprehensively evaluate the multi-degree-of-freedom mechanical properties of the connection structure. Specifically, torsional stiffness can quantify the ability of the male part to resist shear deformation relative to the female part. Pitch stiffness can reflect the ability to resist deformation under bending loads, such as the bending strength of the male and female parts under vibration. Swing stiffness can evaluate the lateral displacement constraint ability of the male and female parts, such as the anti-drift performance of the male and female parts under impact. Through multi-posture testing, the overall performance imbalance caused by stiffness optimization in a single direction can be avoided.

[0014] An electronic device, comprising:

[0015] Memory for storing computer programs;

[0016] A processor is used to implement the steps performed by the above-mentioned connector finite element equivalent modeling method when executing a computer program.

[0017] A computer-readable storage medium stores a computer program, which, when executed, implements the steps of the above-mentioned connector finite element equivalent modeling method.

[0018] A computer program product includes a computer program, and when the computer program is executed, the steps performed by the above connector finite element equivalent modeling method are implemented.

[0019] The electronic device, computer-readable storage medium and computer program product provided by the present invention have the above-mentioned technical effects because the connector finite element equivalent modeling method has the above-mentioned technical effects. Therefore, the electronic device, computer-readable storage medium and computer program product provided by the present invention should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a flow chart of a first specific implementation method of the connector finite element equivalent modeling method provided by the present invention;

[0022] Figure 2 This is a flow chart of a second specific implementation method of the connector finite element equivalent modeling method provided by the present invention;

[0023] Figure 3 This is a flow chart of a third specific implementation method of the connector finite element equivalent modeling method provided by the present invention;

[0024] Figure 4 Schematic diagram of control points and rigid units in a simplified model.

[0025] Reference numerals:

[0026] Control point 1; rigid element 2. DETAILED DESCRIPTION

[0027] The core of the present invention is to provide a connector finite element equivalent modeling method and equipment, storage medium and computer program product, which can significantly improve the efficiency of connector finite element equivalent modeling, reduce the number of grids, and improve calculation accuracy.

[0028] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Since the contact performance between the male and female parts of the connector is crucial to the reliability of the server, in order to perform random vibration simulation analysis on the server and extract the contact force and effective contact stroke between the male and female parts of the connector during random vibration, the connector needs to be finely modeled, especially the gold fingers of the male part and the shrapnel and pins of the female part need to be meshed strictly according to geometric features; in the related art, the number of meshes for a single connector is large, and a server machine has dozens or even hundreds of connectors at most, resulting in a huge number of meshes for the whole machine connector. Simulations of vibration and impact require the use of dynamic explicit algorithms, and a detailed model of the whole machine with a connector takes more time to complete a complete calculation, or even cannot be calculated because the model is too large; for the above problems, the present invention provides a finite element equivalent modeling method for connectors.

[0030] In this embodiment, the connector finite element equivalent modeling method includes the following steps:

[0031] Step S1: creating a simplified model of a connector, the connector comprising a male end part and a female end part;

[0032] Step S2: establishing a bushing connection in the simplified model based on the contact behavior of the male end part and the female end part;

[0033] Step S3: obtaining the moving stiffness and rotational stiffness test results of the male end part and the female end part during the plugging and unplugging process and after the plugging is completed, as simulation parameters;

[0034] Step S4: Create a simulation calculation model according to the simulation parameters and the simplified model.

[0035] Specifically, when creating a simplified model, you can first create a simplified model for a single connector, and then obtain the movement stiffness and rotational stiffness test results of the male and female parts of a single connector during the plugging and unplugging process and after the plugging is completed as simulation parameters; when creating a simulation calculation model, it is necessary to obtain the simplified models of all connectors, establish a bushing connection for the simplified model of each connector, and set the simulation parameters.

[0036] The finite element equivalent modeling method of the connector establishes bushing connection simulation parameters in a simplified model, uses the bushing to simulate the contact force between the male end part and the female end part, and uses a nonlinear spring to simulate the effective contact stroke and plug-in force change between the male and female heads. When obtaining the simulation parameters, not only the movement stiffness of the male end part and the female end part during the plug-in process and after the plug-in is completed is tested, but also the rotational stiffness of the male end part and the female end part is tested, so as to more accurately simulate the state of the connector used in the server, effectively improve the modeling accuracy of the simulation calculation model, thereby improving the calculation accuracy of subsequent calculations, and being conducive to better analysis of the plug-in force between the male end part and the female end part of the connector in the server, and better finding out the problem when the male end part and the female end part are in poor contact, which is conducive to the design of the connector for the server and meets the use requirements of the server.

[0037] Specifically, when obtaining the test results of the movement stiffness and rotational stiffness of the male and female parts during the plugging and unplugging process and after the plugging is completed, the connector can be subjected to three-way movement stiffness and three-way rotational stiffness tests to obtain stiffness curves when the male part is inserted into or pulled out of the female part, when the male part moves relative to the female part in the up and down directions, when the male part moves relative to the female part in the left and right directions, and when the male part is torsionally, pitching, and swinging relative to the female part, respectively. These stiffness curves are taken as test results and used as simulation parameters to establish a simulation calculation model.

[0038] In some implementations, step S1: creating a simplified model of the connector includes:

[0039] Step S11: creating a finite element mesh based on the three-dimensional model of the connector to obtain a mesh model;

[0040] Step S12: creating control points based on the grid model, and creating rigid units at the protruding portion of the male end portion of the connector and the groove portion of the female end portion of the connector, respectively, with the control points serving as main nodes of the rigid units;

[0041] Step S13: Define unit properties and material parameters for the male part and the female part respectively, perform finite element connection, define global contact, and obtain a simplified model of the connector. In actual operation, it is necessary to export the simplified model as a script file of the target finite element calculation software. The target finite element calculation software can be software commonly used in related technologies. In the modeling process, by calling the script file corresponding to the simplified model of each connector, after establishing the bushing connection and setting the simulation parameters, a simulation calculation model can be created.

[0042] In some embodiments, step S11: creating a finite element mesh based on the three-dimensional model of the connector, and obtaining the mesh model includes:

[0043] Step S111: Create a mesh model in the order of mass, center of mass, and moment of inertia, and control the relative errors between the center of mass, mass, and moment of inertia of the simplified model and the three-dimensional model of the connector to be within a preset error range.

[0044] Specifically, a simplified model of the connector is created in the order of mass, center of mass, and moment of inertia. It can be adjusted by appropriately increasing the material density of the connector and appropriately adding mesh units. This is because in dynamic simulation analysis, the external load, the center of mass, moment of inertia, and mass of the component jointly determine the dynamic response process of the component. In the finite element modeling process, if a component is geometrically simplified, the simplified geometry is usually divided into several regions, and each region Vi is individually assigned a density attribute ρ i , according to the formula m=Σρ i V i Determine the total mass; then according to cj=(Σρ i V i X j ) / (Σρ i V i ) to determine the center of mass; finally, according to the moment of inertia formula I = Σρ i V i R i ^2, mainly by adjusting the moment of inertia of the symmetric area Ri; where V i It refers to the volume of each area, and Ri represents the vertical distance from the ith mass element to the rotation axis.

[0045] Furthermore, the three-dimensional model of the connector refers to the original geometric model of the connector, and the preset error range can be set to 0-5%. Under normal circumstances, the simulation benchmarking accuracy required for structural simulation is 90%. According to experience, the deviation between the settings of various simulation parameters and the actual situation cannot be greater than 5%. Too large a deviation will cause the simulation results to deviate too much from the actual situation and fail to achieve a simulation accuracy of 90%. If the deviation is too small, it will take a lot of time and computing resources. Therefore, it is better to choose a preset error range of 0-5%.

[0046] In some embodiments, step S11: creating a finite element mesh based on the three-dimensional model of the connector, obtaining the mesh model further comprises:

[0047] Step S112: Control the outline dimensions of the protruding part of the male end and the groove part of the female end to be consistent. Specifically, by ensuring the consistency of the outline dimensions of the protruding part and the groove part, the assembly accuracy and stability can be improved, and assembly interference or gap problems caused by dimensional deviations can be avoided. It can ensure that the male end and the female end maintain an ideal contact state during the plug-in process, and reduce the risk of stress concentration caused by actual assembly; and it can make the stress distribution in the contact area more uniform, reducing the risk of plastic deformation or fatigue failure caused by excessive local stress; it can improve the efficiency of simulation calculations. In the finite element model, dimensional consistency can simplify the definition of contact pairs and increase the simulation iteration speed; it can more accurately predict the damage evolution process of the connector under cyclic loads.

[0048] In some embodiments, step S11: creating a finite element mesh based on the three-dimensional model of the connector, obtaining the mesh model further comprises:

[0049] Step S113: Control the female end part to be connected to the board through pins, and finely model the pins, and paste and connect the pins to the board and the connector respectively. Specifically, since the pins directly affect the connection stiffness between the male end part and the female end part in the connector, it is necessary to finely model the pins. The degree of fine modeling can be determined by mesh independence analysis. The pin part can be separated from the three-dimensional model, and a separate mesh is performed on it, constraints and loading are performed, and its deformation is analyzed. After that, the mesh size is reduced to half of the original size and the analysis is repeated. When the relative difference between the two deformations is less than 5%, it is considered that the mesh size at this time meets the standard, otherwise the above operation needs to be repeated until the target is reached. The above settings, by finely modeling the pins and pasting and connecting the pins to the board and connector respectively, can characterize the connection strength and connection reliability between the three to the greatest extent; the fine modeling can accurately simulate the physical contact state of the pins, the board and the connector, and avoid poor contact or virtual connection problems caused by assembly errors; at the same time, by accurately constraining the displacement coordination of the pins and the connector, in the assembly model of the board and the connector, the fine pin modeling can more realistically reflect the actual welding or plug-in constraints; in addition, by pasting and connecting the pins to the board, the stress transfer path of the solder joint or fixed point can be accurately simulated, avoiding stress concentration or local plastic deformation caused by simplified boundary conditions. This modeling method is particularly suitable for analyzing the fatigue life of connectors under dynamic loads such as vibration and plugging and unplugging; and, the pasting connection can reduce the number of contact pair definitions by forcing node displacement coordination, thereby avoiding the problem of a surge in the number of iterations caused by contact nonlinearity, shortening the time, and maintaining the flexibility of mesh division.

[0050] In some embodiments, step S12: creating control points based on the grid model, creating rigid units at the protruding portion of the male end portion of the connector and the groove portion of the female end portion of the connector, respectively, and the control points as main nodes of the rigid units include:

[0051] Step S121: creating a control point for each male end part and female end part of each connector respectively; the control point is selected as the centroid position of each component itself;

[0052] Step S122: respectively select the control points of the male end part and the control points of the female end part to create a bushing, the bushing is divided into six degrees of freedom, and a stiffness constraint is created for each degree of freedom; that is, respectively simulate the nonlinear stiffness constraints of the male end part and the female end part when being inserted and removed, the contact stiffness constraints of the male end part when moving up and down relative to the female end part, the contact stiffness constraints of the male end part when moving left and right relative to the female end part, and the stiffness constraints of the male end part relative to the female end part when pitching, twisting and swaying; the stiffness constraint means that there is a spring between two points in relative motion, and when one point moves or rotates relative to another point, it is constrained by the stiffness of the spring between the two points;

[0053] Step S123: Figure 4 As shown in the figure, rigid unit 2 is created at the protruding part of the male end and the groove part of the female end respectively, and control point 1 is used as the main node of the corresponding rigid unit 2. This setting can simplify the model's degrees of freedom and improve the calculation efficiency, significantly reduce the model complexity, and avoid the waste of calculation resources caused by local mesh refinement. At the same time, there is no relative displacement of the internal nodes of the rigid unit 2, which can eliminate the non-physical stress concentration caused by local deformation.

[0054] In some implementations, after step S4: creating a simulation calculation model according to the simulation parameters and the simplified model, the method further includes:

[0055] Step S5: Set boundary conditions for the simulation calculation model, submit the calculation, and obtain the simulation results. Specifically, loads and constraints can be applied to the server machine equipped with a connector according to actual conditions, and the calculation can be submitted. Specifically, the above actual conditions can distinguish which types of working conditions are analyzed for the server machine, such as random vibration, mechanical impact and collision, etc.; different working condition analyses are set differently. Taking the random vibration of the server machine as an example, at this time, the server machine needs to be fixed on the vibration table through a fixture. Fixing means constraint, applying a load that changes with time to the vibration table, driving the vibration table, and causing the server machine to vibrate; through simulation, the contact force changes between the connector and the slot under random vibration are checked, thereby providing a basis for the change in signal impedance.

[0056] In some embodiments, step S3: obtaining the test results of the movement stiffness and rotation stiffness of the male end portion and the female end portion during the plugging process and after the plugging is completed includes:

[0057] Step S31: obtaining an axial nonlinear stiffness curve of the male end portion and the female end portion during the plugging process;

[0058] Step S32: obtaining a nonlinear stiffness curve in the up-down direction and a nonlinear stiffness curve in the left-right direction of the male end part and the female end part after the plugging is completed;

[0059] Step S33: obtaining the torque-torsion angle curve, bending moment-pitch angle curve and torque-sway angle curve of the male end part and the female end part after the plugging is completed.

[0060] In the above process, the male and female parts of the connector are tested for three-way movement stiffness and three-way rotation stiffness, and stiffness curves under six working conditions are obtained; specifically, through actual testing, the force and displacement curves when the male part is inserted into the female part or pulled out from the female part are obtained, and the axial nonlinear stiffness curve is obtained; the male part is moved relative to the female part in the up-down direction and the left-right direction to obtain the up-down nonlinear stiffness curve and the left-right nonlinear stiffness curve; the stiffness of the male part is measured in three postures of torsion, pitch and swing relative to the female part, and the torque-torsion angle curve, the bending moment-pitch angle curve and the torque-swing angle curve are obtained; compared with the related art, the stiffness measurement in the three postures of torsion, pitch and swing is added, which can more comprehensively evaluate the stiffness of the connector. Estimate the multi-degree-of-freedom mechanical properties of the connection structure. Specifically, the torsional stiffness can quantify the ability of the male part to resist shear deformation relative to the female part, the pitch stiffness can reflect the ability to resist deformation under bending load, such as the bending strength of the male and female parts under vibration, and the sway stiffness can evaluate the lateral displacement constraint ability of the male and female parts, such as the anti-drift performance of the male and female parts under impact; through multi-posture testing, the overall performance imbalance caused by the optimization of stiffness in a single direction can be avoided; of course, when measuring the stiffness in the three postures of torsion, pitch, and sway and obtaining the nonlinear stiffness curves in the up and down directions and the left and right directions, it is also necessary to refer to the segmented processing of the axial displacement, that is, when it is detected that the male and female parts are disengaged, the left and right stiffness drops to 0.

[0061] In some embodiments, step S33: obtaining the torque-torsion angle curve, bending moment-pitch angle curve and torque-sway angle curve of the male end portion and the female end portion after the plugging is completed includes:

[0062] Step S331: using a movable fixture of a rotary testing machine to clamp the male end portion, and using a fixed fixture to clamp the female end portion;

[0063] Step S332: the movable fixture is twisted and stepped at a first preset angle to test the torque in this state and obtain a torque-torsion angle curve;

[0064] Step S333: replacing the movable fixture, causing the male end portion to pitch step by step at a second preset angle, measuring the bending moment of each step, and obtaining a bending moment-pitch angle curve;

[0065] Step S334: Replace the movable fixture to make the male end portion swing stepwise at a third preset angle, measure the torque of each step, and obtain a torque-swing angle curve.

[0066] In the above process, the movable fixture of the rotary test machine is used to simulate the complex stress state of the male end part in plugging, unplugging, vibration and other scenarios through twisting, pitching, swinging and other actions. The female end part is rigidly clamped by the fixed fixture to ensure that the position of the female end part remains unchanged, avoiding test interference caused by displacement of the female end part, and having high reliability. Furthermore, with regard to the selection of the values ​​of the first preset angle, the second preset angle and the third preset angle, the material properties, test accuracy requirements and equipment capabilities should be comprehensively considered, and the selection can be made according to actual needs. For example, 0.02°-0.03° or other values ​​can be selected. If the preset angle is too small, the accuracy of the movable fixture cannot be met. If the preset angle is too large, the inflection point of the curve cannot be captured. Therefore, 0.02°-0.03° or other selections can be selected according to needs.

[0067] Specifically, step S3: obtain the test results of the movement stiffness and rotational stiffness of the male end part and the female end part during the plugging and unplugging process and after the plugging is completed, measure the force-displacement and torque-angular displacement curves under six working conditions, namely F1 Vs U1, F2 Vs U2, F3 Vs U3, M1 Vs UR1, M2 Vs UR2, M3 Vs UR3, and the final six-degree-of-freedom nonlinear stiffness curve experimental data are shown in Table 1.

[0068] Table 1 Experimental data of six-degree-of-freedom nonlinear stiffness curve

[0069]

[0070] Among them, ‌F‌ represents the applied axial force, usually in Newton (N), reflecting the size of the external load; ‌U‌ represents the corresponding displacement, characterizing the deformation of the material or structure under force; ‌M‌ represents the bending moment, reflecting the moment response of the structure under bending load, in Newton meter (N·m); UR1~UR3 refer to the rotation angles around the X, Y, and Z axes, respectively. ‌

[0071] In some embodiments, step S4: in creating a simulation calculation model according to simulation parameters and simplified models, in order to reduce the manual operation process, a script program can be pre-set, and by running the script program, the script program automatically opens the script file of the simplified model corresponding to each connector, generates a bushing connection for each connector, automatically sets each stiffness curve in the test results, and associates each stiffness curve with the field variable; it can significantly improve the accuracy of structural performance simulation under complex working conditions, provide more reliable design guidance suggestions, and avoid the process of manual one-by-one operation. Specifically, when pre-setting the script program, the following steps can be adopted:

[0072] 1. Obtain the centroid coordinates. In the finite element pre-processing software, the centroid coordinates of the male end and the die forging part of each connector are automatically extracted through loop statements and written into a table named keypoint.xlsx. (The two control points are used as the main nodes of the rigid units of the male end and the female end respectively);

[0073] 2. Definition of nonlinear bushing properties. Six properties are defined in the script program, corresponding to the six-way stiffness of the connector composed of the male and female parts. This operation is relatively cumbersome in the software, and needs to be repeated six times, and different curves need to be input respectively.

[0074] 3. Read the coordinates of the main nodes of the rigid unit to generate hard points, and name them according to the connector number and the difference between the male and female parts. For example, the main node of the male part of connector No. 1 is named Ma_1, and the main node of the female part is named Fe_1. Read the coordinates of the main nodes of the male and female parts of other connectors in turn to generate hard points.

[0075] 4. Connect paired hard points to generate commands with different numbers for creating polylines;

[0076] 5. Define the bushing properties for the created polyline command.

[0077] Specifically, in actual operation, you can pre-set the script program for only one connector. If you want to create bushings for all connectors of the entire machine, you only need to copy and paste the relevant segments of the script program and modify the control point coordinates and stiffness curve. It should be noted that when the script file is modified, you need to submit the calculation through the script command.

[0078] Specifically, Figure 1 As shown, in a first specific embodiment, the connector finite element equivalent modeling method includes the following steps:

[0079] Step S1: creating a simplified model of a connector, the connector comprising a male end part and a female end part;

[0080] Step S2: establishing a bushing connection in the simplified model based on the contact behavior of the male end part and the female end part;

[0081] Step S3: obtaining the moving stiffness and rotational stiffness test results of the male end part and the female end part during the plugging and unplugging process and after the plugging is completed, as simulation parameters;

[0082] Step S4: Create a simulation calculation model according to the simulation parameters and the simplified model.

[0083] like Figure 2 As shown, in the second specific embodiment, the connector finite element equivalent modeling method includes the following steps:

[0084] Step S1: creating a simplified model of a connector, the connector comprising a male end part and a female end part;

[0085] Step S11: creating a finite element mesh based on the three-dimensional model of the connector to obtain a mesh model;

[0086] Step S12: creating control points based on the grid model, and creating rigid units at the protruding portion of the male end portion of the connector and the groove portion of the female end portion of the connector, respectively, with the control points serving as main nodes of the rigid units;

[0087] Step S13: defining unit attributes and material parameters for the male end part and the female end part respectively, performing finite element connection, defining global contact, and obtaining a simplified model of the connector;

[0088] Step S2: establishing a bushing connection in the simplified model based on the contact behavior of the male end part and the female end part;

[0089] Step S3: obtaining the moving stiffness and rotational stiffness test results of the male end part and the female end part during the plugging and unplugging process and after the plugging is completed, as simulation parameters;

[0090] Step S4: Create a simulation calculation model according to the simulation parameters and the simplified model.

[0091] like Figure 3 As shown, in the third specific embodiment, the connector finite element equivalent modeling method includes the following steps:

[0092] Step S1: creating a simplified model of a connector, the connector comprising a male end part and a female end part;

[0093] Step S2: establishing a bushing connection in the simplified model based on the contact behavior of the male end part and the female end part;

[0094] Step S3: obtaining the moving stiffness and rotational stiffness test results of the male end part and the female end part during the plugging and unplugging process and after the plugging is completed, as simulation parameters;

[0095] Step S31: obtaining an axial nonlinear stiffness curve of the male end portion and the female end portion during the plugging process;

[0096] Step S32: obtaining a nonlinear stiffness curve in the up-down direction and a nonlinear stiffness curve in the left-right direction of the male end part and the female end part after the plugging is completed;

[0097] Step S33: obtaining a torque-torsion angle curve, a bending moment-pitch angle curve and a torque-sway angle curve of the male end part and the female end part after the plugging is completed;

[0098] Step S4: Create a simulation calculation model according to the simulation parameters and the simplified model.

[0099] Specifically, in the fourth specific embodiment, the connector finite element equivalent modeling method includes the following steps:

[0100] Step S1: creating a simplified model of a connector, the connector comprising a male end part and a female end part;

[0101] Step S11: creating a finite element mesh based on the three-dimensional model of the connector to obtain a mesh model;

[0102] Step S111: creating a mesh model in the order of mass, center of mass, and moment of inertia, and controlling the relative errors between the center of mass, mass, and moment of inertia of the simplified model and the three-dimensional model of the connector to be within a preset error range;

[0103] Step S112: controlling the outline size of the protruding portion of the male end portion and the recessed portion of the female end portion to be consistent;

[0104] Step S113: controlling the female end part to be connected to the board through pins, finely modeling the pins, and pasting and connecting the pins to the board and the connector respectively;

[0105] Step S12: creating control points based on the grid model, and creating rigid units at the protruding portion of the male end portion of the connector and the groove portion of the female end portion of the connector, respectively, with the control points serving as main nodes of the rigid units;

[0106] Step S13: defining unit attributes and material parameters for the male end part and the female end part respectively, performing finite element connection, defining global contact, and obtaining a simplified model of the connector;

[0107] Step S2: Based on the contact behavior of the male end part and the female end part, a bushing connection is established in the simplified model; all contact and plug-in force stiffness and other contact behaviors between the male end part and the female end part are simulated using the bushing;

[0108] Step S3: Obtain the test results of the moving stiffness and rotational stiffness of the male end part and the female end part during the plugging and unplugging process and after the plugging is completed as simulation parameters; wherein, the stiffness curve needs to be associated with the field variable, and the axial displacement of the male end part and the female end part is used as the variable. When the axial displacement is monitored to be greater than a certain value during the calculation process, all stiffnesses are reduced to 0;

[0109] Step S31: obtaining an axial nonlinear stiffness curve of the male end portion and the female end portion during the plugging process;

[0110] Step S32: obtaining a nonlinear stiffness curve in the up-down direction and a nonlinear stiffness curve in the left-right direction of the male end part and the female end part after the plugging is completed;

[0111] Step S33: obtaining a torque-torsion angle curve, a bending moment-pitch angle curve and a torque-sway angle curve of the male end part and the female end part after the plugging is completed;

[0112] Step S331: using a movable fixture of a rotary testing machine to clamp the male end portion, and using a fixed fixture to clamp the female end portion;

[0113] Step S332: the movable fixture is twisted and stepped at a first preset angle to test the torque in this state and obtain a torque-torsion angle curve;

[0114] Step S333: replacing the movable fixture, causing the male end portion to pitch step by step at a second preset angle, measuring the bending moment of each step, and obtaining a bending moment-pitch angle curve;

[0115] Step S334: replacing the movable fixture, causing the male end portion to swing and step at a third preset angle, measuring the torque of each step, and obtaining a torque-swing angle curve;

[0116] Step S4: Create a simulation calculation model based on the simulation parameters and the simplified model.

[0117] The connector finite element equivalent modeling method provided by the inventor has the following beneficial effects:

[0118] 1. Improve the timeliness and accuracy of random vibration simulation of server products, improve the quality of meshes, and reduce the number of meshes by 98%, making random vibration simulation of the whole machine possible;

[0119] 2. Accurately simulate the effective contact stroke and contact force of the male and female parts of the connector, accurately extract the contact force of each connector, combine the contact impedance, assist in signal integrity signal quality analysis, locate other problems caused by bandwidth loss and poor signal in reliability testing or actual server operation, and quickly solve the problems.

[0120] 3. In the early stages of R&D, risks can be identified through simulation, which is beneficial to improving the reliability, performance and quality of server products.

[0121] In addition to the above connector finite element equivalent modeling method, the present invention also provides an electronic device, including:

[0122] Memory for storing computer programs;

[0123] A processor is used to implement the steps performed by the above-mentioned connector finite element equivalent modeling method when executing a computer program.

[0124] In addition to the above-mentioned electronic device, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed, the steps performed by the above-mentioned connector finite element equivalent modeling method are implemented.

[0125] In addition to the above-mentioned computer-readable storage medium, the present invention also provides a computer program product, including a computer program, which implements the steps performed by the above-mentioned connector finite element equivalent modeling method when executed.

[0126] The above is a detailed introduction to the connector finite element equivalent modeling method provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A connector finite element equivalent modeling method, characterized in that: The following steps are involved: Creating a simplified model of a connector, the connector comprising a male portion and a female portion; establishing a bushing connection in the simplified model based on contact behavior of the male end portion and the female end portion; Obtaining the moving stiffness and the rotating stiffness test results of the male end part and the female end part during the plugging and unplugging process and after the plugging is completed as the simulation parameters; A simulation calculation model is created according to the simulation parameters and the simplified model.

2. The connector finite element equivalent modeling method according to claim 1 is characterized in that: The step of creating a simplified model of the connector includes: Creating a finite element mesh based on the three-dimensional model of the connector to obtain a mesh model; Creating control points based on the grid model, and creating rigid units at the protruding portion of the male end portion of the connector and the recessed portion of the female end portion of the connector, respectively, with the control points serving as main nodes of the rigid units; The unit properties and material parameters are defined for the male end part and the female end part respectively, and finite element connection is performed. After defining global contact, a simplified model of the connector is obtained.

3. The connector finite element equivalent modeling method according to claim 2 is characterized in that: The step of creating a finite element mesh based on the three-dimensional model of the connector to obtain a mesh model comprises: The mesh model is created in the order of mass, center of mass, and moment of inertia, and the relative errors between the center of mass, mass, and moment of inertia of the simplified model and the three-dimensional model of the connector are controlled within a preset error range.

4. The connector finite element equivalent modeling method according to claim 2 is characterized in that: The step of creating a finite element mesh based on the three-dimensional model of the connector to obtain a mesh model further comprises: The protruding portion of the male end portion is controlled to be consistent with the outline size of the recessed portion of the female end portion.

5. The connector finite element equivalent modeling method according to claim 2, characterized in that: The step of creating a finite element mesh based on the three-dimensional model of the connector to obtain a mesh model further comprises: The female end portion is controlled to be connected to the board through pins, and the pins are finely modeled, and the pins are respectively connected to the board and the connector by pasting.

6. The connector finite element equivalent modeling method according to claim 2, characterized in that: The control points are created based on the grid model, and rigid units are created at the protruding portion of the male end portion of the connector and the groove portion of the female end portion of the connector, respectively. The control points are used as main nodes of the rigid units and include: Creating a control point for each male end portion and female end portion of the connector; Selecting the control points of the male end portion and the control points of the female end portion respectively to create a bushing, wherein the bushing is divided into six degrees of freedom, and a stiffness constraint is created for each degree of freedom; Rigid units are created at the protruding portion of the male end portion and the recessed portion of the female end portion, respectively, and the control points serve as main nodes of the corresponding rigid units.

7. The connector finite element equivalent modeling method according to any one of claims 1 to 6, characterized in that: The obtaining of the test results of the movement stiffness and rotation stiffness of the male end part and the female end part during the plugging process and after the plugging is completed comprises: Obtaining an axial nonlinear stiffness curve of the male end portion and the female end portion during the plugging process; Obtaining a nonlinear stiffness curve in the up-down direction and a nonlinear stiffness curve in the left-right direction of the male end portion and the female end portion after the plugging is completed; The torque-torsion angle curve, the bending moment-pitch angle curve and the torque-sway angle curve of the male end part and the female end part after the plugging is completed are obtained.

8. The connector finite element equivalent modeling method according to claim 7, characterized in that: The step of obtaining the torque-torsion angle curve, the bending moment-pitch angle curve and the torque-sway angle curve of the male end part and the female end part after the plugging is completed comprises: The male end portion is clamped by a movable fixture of a rotary testing machine, and the female end portion is clamped by a fixed fixture; The movable fixture is twisted and stepped at a first preset angle to test the torque in this state and obtain a torque-torsion angle curve; Replacing the movable fixture, so that the male end portion is pitched stepwise at a second preset angle, measuring the bending moment of each step, and obtaining a bending moment-pitch angle curve; The movable fixture is replaced to make the male end portion swing stepwise at a third preset angle, and the torque of each step is measured to obtain a torque-swing angle curve.

9. An electronic device, characterized in that: include: Memory for storing computer programs; A processor, used to implement the steps of the connector finite element equivalent modeling method as described in any one of claims 1 to 8 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed, implements the steps of the connector finite element equivalent modeling method according to any one of claims 1 to 8.

11. A computer program product, characterized in that It comprises a computer program, which, when executed, implements the steps performed by the connector finite element equivalent modeling method according to any one of claims 1 to 8.

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