Driving half shaft bending mode parameter identification method and device, electronic equipment and medium

Abstract

The invention relates to the technical field of drive half shaft control analysis, in particular to a drive half shaft bending mode parameter identification method and device, electronic equipment and a medium, and the method comprises the steps: obtaining the assembly three-dimensional data of a drive half shaft; generating a finite element network of each part of the driving half shaft according to the assembly three-dimensional data; generating a finite element model of each part according to the finite element network of each part, generating a finite element model of the driving half shaft according to the finite element model of each part, and endowing the finite element model with material data and boundary conditions; and obtaining modal calculation parameters, displacement output parameters and an extraction frequency range of the bending modal parameters of the finite element model, simulating the finite element model, determining a first-order modal frequency and a modal shape diagram of the driving half shaft according to a simulation result, and identifying the bending modal parameters of the driving half shaft. Therefore, the problems of relatively long design and manufacturing periods of the drive half shaft and the like caused by relatively poor identification efficiency and accuracy of the one-bending modal parameter of the drive half shaft are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of drive half shaft control analysis, in particular to a drive half shaft bending modal parameter identification method and device, an electronic equipment and a medium. BACKGROUND

[0002] The drive half shaft is an important path for power transmission of a passenger vehicle. Due to unreasonable design of a first-order modal frequency, resonance of other components, booming and vibration in the vehicle, and the like occur.

[0003] In the related art, a hexahedral mesh needs to be established, and the establishment and combination of the hexahedral mesh are time-consuming and laborious. The drive half shaft one-bending modal parameter identification work can only be carried out after assembly of the drive half shaft is completed. However, the design and manufacturing cycle of the drive half shaft are relatively long, and the reality demand that the vehicle development cycle is sharply shortened cannot be met. SUMMARY

[0004] The application provides a drive half shaft bending modal parameter identification method, device, electronic equipment and medium to solve the problems of poor drive half shaft one-bending modal parameter identification efficiency and accuracy, and long drive half shaft design and manufacturing cycle.

[0005] The first aspect embodiment of the application provides a drive half shaft bending modal parameter identification method, including the following steps: obtaining assembly three-dimensional data of the drive half shaft; generating a finite element network of each component of the drive half shaft according to the assembly three-dimensional data; generating a finite element model of each component according to the finite element network of each component, generating a finite element model of the drive half shaft according to the finite element model of each component, and assigning material data and boundary conditions to the finite element model; obtaining modal calculation parameters, displacement output parameters, and a bending modal parameter extraction frequency range of the finite element model, simulating the finite element model based on the modal calculation parameters, displacement output parameters and extraction frequency range, determining a first-order modal frequency and a modal vibration mode diagram of the drive half shaft according to a simulation result, and identifying a bending modal parameter of the drive half shaft according to the first-order modal frequency and the modal vibration mode diagram.

[0006] Optionally, the calculation formula of the first-order modal frequency is as follows:

[0007]

[0008] wherein, is the first-order bending modal frequency of the drive half shaft, is the first-order bending modal frequency of the power assembly, is a first-order local modal frequency of the body-in-white greater than the first-order bending modal frequency of the power assembly.

[0009] Optionally, generating the finite element network of each component of the drive half shaft according to the assembly three-dimensional data comprises: identifying the geometric model of each component in the assembly three-dimensional data; performing mesh processing on the geometric model of each component to obtain the finite element network of each component, wherein the flange and the solid pipe in each component are processed as a solid network, and the hollow shaft pipe in each component is processed as a two-dimensional network.

[0010] Optionally, generating the finite element model of the drive half shaft according to the finite element model of each component comprises: detecting whether the finite element model of each component satisfies a completeness condition; if the finite element model of each component satisfies the completeness condition, establishing a coordinate system in a software interface, taking the drive half shaft as an X direction, taking a direction perpendicular to the shaft pipe as a Y direction, and determining a Z direction by using a right-hand rule; and assembling the finite element model of each component in the coordinate system to obtain the finite element model of the drive half shaft.

[0011] Optionally, detecting whether the finite element model of each component satisfies the completeness condition comprises: if it is detected that the finite element model of each component comprises the finite element model of the shaft pipe, the finite element model of the universal joint, the finite element model of the bracket, and the finite element model of the connecting flange, it is determined that the finite element model of each component satisfies the completeness condition.

[0012] Optionally, before assembling the finite element model of each component in the coordinate system to obtain the finite element model of the drive half shaft, the method further comprises: identifying the universal joint in each component, and simplifying the universal joint as a spring stiffness.

[0013] Optionally, the material data comprises two-dimensional element data and solid element data of the model shaft pipe, the two-dimensional element data of the model shaft pipe comprises at least one of a material name, a two-dimensional element thickness, a Young's modulus, a Poisson's ratio, and a density, the solid element data comprises at least one of a material name, a Young's modulus, a Poisson's ratio, and a density, and the boundary condition comprises rigid constraints at both ends of the drive half shaft.

[0014] The second aspect embodiment of the application provides a drive half shaft bending modal parameter identification device, comprising: an acquisition module configured to acquire assembly three-dimensional data of a drive half shaft; a generation module configured to generate a finite element network of each component of the drive half shaft according to the assembly three-dimensional data; an assignment module configured to generate a finite element model of each component according to the finite element network of each component, generate a finite element model of the drive half shaft according to the finite element model of each component, and assign material data and boundary conditions to the finite element model; and an output module configured to acquire modal calculation parameters, displacement output parameters, and a frequency range for extracting bending modal parameters of the finite element model, simulate the finite element model based on the modal calculation parameters, the displacement output parameters, and the frequency range for extracting bending modal parameters, determine a first-order modal frequency and a modal shape diagram of the drive half shaft according to a simulation result, and identify bending modal parameters of the drive half shaft according to the first-order modal frequency and the modal shape diagram.

[0015] Optionally, the formula for calculating the first order modal frequency is:

[0016]

[0017] wherein, is the first order bending modal frequency of the drive half shaft, is the first order bending modal frequency of the power assembly, is the first order local modal frequency of the body-in-white greater than the first order bending modal frequency of the power assembly.

[0018] Optionally, the generating module is further configured to: identify the geometric models of the components in the assembly three-dimensional data; and perform mesh processing on the geometric models of the components to obtain finite element networks of the components, wherein the flanges and solid pipes in the components are processed as solid networks, and the hollow shaft pipes in the components are processed as two-dimensional networks.

[0019] Optionally, the assigning module is further configured to: detect whether the finite element models of the components satisfy the completeness condition; if the finite element models of the components satisfy the completeness condition, establish a coordinate system in a software interface, take the drive half shaft as the X direction, take the direction perpendicular to the shaft pipe and parallel to the ground as the Y direction, and determine the Z direction by using the right-hand rule; and assemble the finite element models of the components in the coordinate system to obtain the finite element model of the drive half shaft.

[0020] Optionally, the assigning module is further configured to: detect whether the finite element models of the components satisfy the completeness condition, including: if the finite element models of the components include the finite element models of the shaft pipes, the finite element models of the universal joints, the finite element models of the brackets, and the finite element models of the connecting flanges, it is determined that the finite element models of the components satisfy the completeness condition.

[0021] Optionally, the apparatus further includes an identifying module configured to, before assembling the finite element models of the components in the coordinate system to obtain the finite element model of the drive half shaft, identify the universal joints in the components, and simplify the universal joints into spring stiffness.

[0022] Optionally, the material data includes two-dimensional unit data and solid unit data of the model shaft pipe, the two-dimensional unit data of the model shaft pipe includes at least one of a material name, a two-dimensional unit thickness, a Young's modulus, a Poisson's ratio, and a density, the solid unit data includes at least one of a material name, a Young's modulus, a Poisson's ratio, and a density, and the boundary condition includes rigid constraints at both ends of the drive half shaft.

[0023] The third aspect of the embodiments of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the program to implement the drive half shaft bending modal parameter identification method of the above-mentioned embodiments.

[0024] The fourth aspect of the present application provides a computer readable storage medium, which stores a computer program. The program is executed by a processor to implement the drive half shaft bending modal parameter identification method of the above-mentioned embodiments.

[0025] Therefore, the present application includes the following beneficial effects: The embodiments of the present application can generate a finite element network of each component by processing the identified assembly three-dimensional data of the drive half shaft, establish a coordinate system in a software interface, assemble a finite element model meeting the integrity condition, use a consistent unit system, transform spring stiffness, assign material data, and add boundary conditions to obtain the finite element model of the drive half shaft, use the calculation formula of the first order modal frequency to obtain the first order modal frequency, modal vibration mode diagram, and identified bending modal parameters of the drive half shaft, which realizes fast modeling of the finite element, ensures the consistency of the first order bending calculation modal and the test modal of the drive half shaft assembly, and improves the efficiency of the finite element network establishment and the accuracy of the result analysis. Therefore, the problems of poor efficiency and accuracy of the drive half shaft bending modal parameter identification, long design and manufacturing cycle of the drive half shaft, and the like are solved.

[0026] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 A flowchart of a drive half shaft bending modal parameter identification method according to an embodiment of the present application is provided. Figure 2 A reference finite element model according to an embodiment of the present application is provided. Figure 3 A drive half shaft local coordinate system and a schematic diagram according to an embodiment of the present application are provided. Figure 4 A reference diagram of a drive half shaft using rigid constraints at both ends according to an embodiment of the present application is provided. Figure 5 A schematic diagram of a RBE2 rigid unit connection according to an embodiment of the present application is provided. Figure 6 A schematic diagram of a RBE2 rigid unit connection according to another embodiment of the present application is provided. Figure 7 A simplified schematic diagram of a CBUSH spring unit according to an embodiment of the present application is provided. Figure 8An output calculation result mode shape diagram provided according to an embodiment of the present application; Figure 9 A driving half shaft bending modal parameter identification method calculation flowchart provided according to an embodiment of the present application. Figure 10 An example diagram of a driving half shaft bending modal parameter identification device provided according to an embodiment of the present application. Figure 11 A structure diagram of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0029] The driving half shaft bending modal parameter identification method, device, electronic equipment and medium of the embodiments of the present application are described below with reference to the accompanying drawings. In view of the problems of poor driving half shaft bending modal parameter identification efficiency and accuracy, long driving half shaft design and manufacturing cycle and the like mentioned in the above background art, the present application provides a driving half shaft bending modal parameter identification method. In the method, the assembly three-dimensional data of the identified driving half shaft is processed to generate a finite element network of each component part, a coordinate system is established in a software interface, a finite element model that meets the completeness condition is assembled, a consistent unit system is used, spring stiffness is converted, material data is assigned, and boundary conditions are added, so as to obtain the finite element model of the driving half shaft, use the calculation formula of the first order modal frequency, obtain the first order modal frequency, modal shape diagram and identified driving half shaft bending modal parameters of the driving half shaft, realize the rapid modeling of the finite element and the regulation of the modeling calculation method, ensure the accuracy of the finite element model and the convergence of the analysis result, improve the reliability of the first order bending modal control analysis of the driving half shaft, and improve the efficiency and accuracy of the result analysis. Thus, the problems of poor driving half shaft bending modal parameter identification efficiency and accuracy, long driving half shaft design and manufacturing cycle and the like are solved.

[0030] Specifically, Figure 1 A flowchart of a driving half shaft bending modal parameter identification method provided by an embodiment of the present application.

[0031] As Figure 1 shown, the driving half shaft bending modal parameter identification method includes the following steps: In step S101, the assembly three-dimensional data of the driving half shaft is obtained.

[0032] The driving half shaft is a component of the automobile transmission system that transmits the power and torque output by the differential to the driving wheels of the automobile to make the wheels rotate and drive the vehicle to move forward or backward. The assembly three-dimensional data is information contained in the digital three-dimensional model of the driving half shaft assembly and each component thereof created by using computer-aided design software.

[0033] It can be understood that the assembly three-dimensional data of the driving half shaft is obtained, and the driving half shaft is iteratively optimized based on the three-dimensional data in the software.

[0034] Specifically, the assembly three-dimensional data of the driving half shaft is recommended to use the STandard for the Exchange of Product model data (STP) format as shown in Table 1. The assembly three-dimensional data of the driving half shaft needs to obtain the material grade, weight, and notes of components such as the shaft tube, connecting flange, and universal joint.

[0035] Table 1

[0036] The embodiments of the present application can obtain the material grade and weight of each component of the driving half shaft by obtaining the assembly three-dimensional data of the driving half shaft, and iteratively optimize the driving half shaft by modifying and designing in the software.

[0037] In step S102, the finite element network of each component of the driving half shaft is generated according to the assembly three-dimensional data.

[0038] The finite element network is a combination of a large number of simple, discrete, and interconnected small units divided from a complex continuous geometric model.

[0039] It can be understood that the assembly three-dimensional data of the driving half shaft is disassembled into the finite element network of each component, and the local mechanical properties are accurately captured by performing finite element analysis according to the finite element network of each component of the driving half shaft.

[0040] Specifically, the finite element network includes solid grids such as tetrahedron and hexahedron units, two-dimensional grids such as quadrilateral and triangular shell units, and the like. Figure 2 As shown in FIG. 1, a reference finite element model provided by the embodiments of the present application is shown. When the finite element grid is divided for each component of the driving half shaft, the appropriate grid type needs to be selected according to the structural characteristics of each component of the driving half shaft.

[0041] Further, in the embodiment of the present application, generating the finite element network of each component of the drive half shaft according to the assembly three-dimensional data comprises: identifying the geometric model of each component in the assembly three-dimensional data; and performing mesh processing on the geometric model of each component to obtain the finite element network of each component, wherein the flange and the solid pipe in each component are processed as a solid network, and the idle shaft pipe in each component is processed as a two-dimensional network.

[0042] The mesh processing is an operation and optimization of generating a high-quality mesh after the geometric model is meshed before the finite element analysis; the flange is a disc-shaped part with bolt holes and sealing surfaces for connecting pipes, valves, pumps, equipment, etc. with each other or fixing them on a base; the solid pipe is a solid tubular material or part with a solid cross section; the solid network is a mesh type for dividing a three-dimensional solid model in the finite element analysis; the idle shaft pipe is a hollow tubular part similar to the drive half shaft in the suspension system of a non-driving wheel, without universal joints and splines, and does not transmit any power; and the two-dimensional network is a mesh type for dividing a curved surface or a plane in the finite element analysis.

[0043] It can be understood that the finite element network of each component of the drive half shaft is generated according to the assembly three-dimensional data. The geometric model of each component in the assembly three-dimensional data needs to be identified and processed to obtain the finite element network such as the solid network and the two-dimensional network, so as to convert each component of the drive half shaft into a mathematical model that can be scientifically calculated by a computer, and accurately predict the performance of the drive half shaft under actual working conditions in a virtual environment.

[0044] Specifically, the flange, the universal joint shaft head and the solid shaft pipe of the drive half shaft are processed into the solid network through mesh processing, in the form of a tetrahedral second-order solid element or a hexahedral first-order element, which can accurately capture the stress concentration and deformation of the bolt hole, the flange and the shaft pipe welding position, etc.; and the idle shaft pipe of the drive half shaft is processed into the two-dimensional network through mesh processing, in the form of a quadrilateral plate shell element, which can ensure the accuracy, greatly reduce the number of meshes and the amount of calculation.

[0045] The embodiment of the present application accurately predicts the performance of the drive half shaft under actual working conditions in a virtual environment by processing the identified assembly three-dimensional data of the drive half shaft to generate the finite element network of each component.

[0046] In step S103, the finite element model of each component is generated according to the finite element network of each component, the finite element model of the drive half shaft is generated according to the finite element model of each component, and material data and boundary conditions are given to the finite element model.

[0047] The finite element model is a mathematical model that can perform mechanical calculation and is composed of a finite element grid, material data and boundary conditions; the material data are material mechanical performance parameters representing the action and response of each component; and the boundary conditions are external constraints applied to the finite element model and defining the fixing and force mode of the finite element model.

[0048] It can be understood that the finite element model of each component and the finite element model of the drive half shaft are generated through the finite element network of each component, the geometric digital model of each component is converted into a quantifiable analysis system, the material data and boundary conditions of the finite element model are assigned, the model is provided with real physical conditions, the consistency of the test modal is ensured, the accurate analysis of the finite element model and the accurate prediction of the assembly performance are realized, and the efficiency and accuracy of the result analysis are improved.

[0049] Specifically, the finite element models of the three-pin universal joint, the ball cage type universal joint, the intermediate shaft, the spline sleeve, the dust cover and the like that have been divided into grids must use consistent units, the connection relationship is created in the software, the material data of the material grade, the material elastic modulus, the material Poisson's ratio, the material density and the like and the boundary conditions of the geometric constraint, the contact constraint and the special boundary are defined, and the components are assembled to form the finite element model of the drive half shaft.

[0050] Table 2

[0051] Further, in the embodiment of the present application, the finite element model of the drive half shaft is generated according to the finite element models of the components, which includes: detecting whether the finite element models of the components meet the completeness condition; if the finite element models of the components meet the completeness condition, establishing a coordinate system in the software interface, taking the drive half shaft as the X direction, the vertical shaft tube parallel to the ground direction as the Y direction, and determining the Z direction by the right-hand rule; and assembling the finite element models of the components in the coordinate system to obtain the finite element model of the drive half shaft.

[0052] The completeness condition is a condition that the shape function used can accurately represent the rigid body displacement and the constant strain state; and the right-hand rule is a memory rule for determining the direction of the cross product of two vectors in a three-dimensional space.

[0053] It can be understood that the finite element model of the drive half shaft is generated according to the finite element models of the components, the completeness of the finite element models of the components needs to be detected, the coordinate system is established in the analysis software for the finite element models of the components that meet the completeness condition, the accuracy of the finite element model and the convergence of the analysis result are ensured, the rapid modeling of the finite element model of the drive half shaft in the application software is realized, and the efficiency and accuracy of the result analysis are improved.

[0054] Specifically, when the finite element models of each component meet the integrity conditions, a local coordinate system is established using existing commercial software interfaces such as Hyperworks (an enterprise-level CAE simulation platform) and MSC.Nastran (NASA Structural Analysis System).

[0055] like Figure 3 As shown, a local coordinate system is set in the software for the finite element model. A local coordinate system is set at the position of the universal joint. The X-axis is the drive half-axis, the Y-axis is the direction parallel to the ground of the vertical axis tube, and the Z-axis is determined by the right-hand rule. K1 to K6 are defined as the X, Y, Z translational directions and X, Y, Z rotational directions, respectively. The units of K1 to K3 are N / mm, and the units of K4 to K6 are N·mm / rad.

[0056] Furthermore, in the embodiments of this application, detecting whether the finite element model of each component meets the integrity condition includes: if it is detected that the finite element model of each component includes the finite element model of the shaft tube, the finite element model of the universal joint, the finite element model of the bracket and the finite element model of the connecting flange, then it is determined that the finite element model of each component meets the integrity condition.

[0057] Among them, a universal joint is a mechanical component that allows two connected shafts to undergo relative changes within a certain angular range while still continuously transmitting rotational motion; a bracket is a mechanical part that provides a stable installation position for other components, maintains their correct posture, and bears their weight and the load generated during operation; a connecting flange is a disc-shaped connector that enables detachable and sealed connections between pipes, pipes and valves, equipment and equipment, etc.

[0058] Understandably, when examining the finite element models of shaft tubes, universal joints, brackets, and connecting flanges, it is necessary to determine that the finite element models of each component meet the completion conditions to ensure the accuracy of the finite element models and the convergence of the analysis results, thereby improving the efficiency and accuracy of the results analysis.

[0059] Specifically, flanges, universal joint shaft heads, and solid shaft tubes adopt tetrahedral second-order solid elements or hexahedral first-order elements. Their finite element models must meet the following completion conditions: at least 2 layers of elements in the thickness direction of the split part, with a recommended element size of 3 mm and a maximum element size of <6 mm; 95% of the elements have an aspect ratio of <5, and the maximum element size must not exceed 10; 95% of the elements have a warp angle of <7°, and the maximum element size must not exceed 10°; 95% of the elements have a twist angle of <30°, and the maximum element size must not exceed 45°; 95% of the elements have a cone angle of >90%, and the minimum cone angle must not exceed 60%.

[0060] The hollow shaft tube adopts quadrilateral elements, and the finite element model meets the completeness condition that the number of quadrilateral elements is greater than 95% and the number of triangular elements is less than 5%; the recommended unit size is 3 mm, and the maximum unit size is less than 6 mm; the warping angle of 95% of the units is less than 7 degrees, and the warping angle of all units is less than 10 degrees; the length-width ratio of 95% of the units is less than 5, and the length-width ratio of all units is less than 7; the twist angle of 95% of the units is less than 30 degrees, and the twist angle of all units is less than 40 degrees; the Jacobian side of 95% of the units is less than 0.7, and the Jacobian side of all units is less than 0.3; the taper of 95% of the units is less than 0.7, and the taper of all units is less than 0.8; the maximum angle of 95% of the units is less than 120 degrees, and the maximum angle of the units that do not meet the condition is less than 135 degrees.

[0061] Further, in the embodiment of the present application, before assembling the finite element models of each part in the coordinate system to obtain the finite element model of the drive half shaft, it further includes: identifying the universal joint in each part, and simplifying the universal joint into spring stiffness.

[0062] Wherein, the spring stiffness is a parameter representing the ability of an object to resist deformation.

[0063] It can be understood that simplifying the universal joint into spring stiffness can meet the engineering requirements and improve the calculation efficiency under the condition of ensuring the analysis accuracy.

[0064] Specifically, different universal joints adopt different spring stiffness constraints, and the recommended stiffness parameters are shown in Table 3: Table 3

[0065] Further, in the embodiment of the present application, the material data includes model shaft tube two-dimensional element data and entity element data, the model shaft tube two-dimensional element data includes at least one of material name, two-dimensional element thickness, Young's modulus, Poisson's ratio and density, the entity element data includes at least one of material name, Young's modulus, Poisson's ratio and density, and the boundary condition includes rigid constraint at both ends of the drive half shaft.

[0066] Wherein, the two-dimensional element thickness is the thickness of the shell element in finite element analysis; the Young's modulus describes the proportional relationship between the force per unit area and the relative deformation in the elastic range of the material, and is a physical quantity for measuring the ability of the material to resist elastic deformation; the Poisson's ratio is the negative value of the transverse strain to axial strain ratio when the material is subjected to uniaxial tension or compression; the rigid constraint is a boundary condition applied to the model geometry, which is used to completely restrict the freedom of points, edges or surfaces.

[0067] It can be understood that the material data includes model axis pipe two-dimensional unit data such as material name, two-dimensional unit thickness, Young's modulus, Poisson's ratio and density, and entity unit data such as material name, Young's modulus, Poisson's ratio and density, and the boundary condition includes a constraint mode such as rigid constraint, in the same model, according to the characteristics and analysis requirements of the components, shell elements and entity elements are mixedly used, on the premise of ensuring the accuracy of the key area, the engineering scene is accurately reproduced, the calculation complexity is simplified, the calculation efficiency is improved, the model accuracy and authenticity are ensured.

[0068] Specifically, using two-dimensional unit data such as shell elements, only in-plane degrees of freedom, most thin-walled structures can be simulated, the number of nodes and the size of the equation to be solved are much smaller than entity elements, and the calculation speed is usually one order of magnitude faster than entity elements; using entity elements can accurately calculate the stress distribution in the wall thickness direction when the axis pipe is subjected to internal pressure.

[0069] The model boundary condition is set to rigid constraint at both ends of the driving half shaft, as shown in Figure 4 , the red part is a rigid element using RBE2 (Rigid Body Element, Form 2), and the green part is a constraint element, which constrains 6 degrees of freedom, including translation and rotation in XYZ directions, as shown in Figure 5 , a schematic diagram of a rigid element using RBE2 connecting the center position of the ball cage side of the gimbal simplified position, as shown in Figure 6 , a schematic diagram of a rigid element using RBE2 connecting the connection position of the half shaft and the ball cage, as shown in Figure 7 , a schematic diagram of a rigid element using RBE2 connecting the center position of the ball cage side of the gimbal simplified position, and a schematic diagram of a rigid element using RBE2 connecting the connection position of the half shaft and the ball cage, the center nodes of the RBE2 are simplified using CBUSH (Bushing Element, spring damping element) spring element, only the stiffness is shown, and the damping size is ignored. In fact, under the condition of consistent coordinates, the two nodes are co-nodes, in order to display, Figure 7 , the two nodes are displayed separately in

[0070] The embodiment of the application establishes a coordinate system in a software interface, assembles a finite element model satisfying the completeness condition, obtains a finite element model of the driving half shaft, uses consistent unit system, converts spring stiffness, assigns material data and boundary conditions, and the like, so that the model has real physical conditions, ensures the accuracy of the finite element model and the convergence of the analysis results, improves the efficiency and accuracy of the result analysis, and realizes accurate prediction of the performance of each component and assembly.

[0071] In step S104, the modal calculation parameters, the displacement output parameters, and the extraction frequency range of the bending modal parameters of the finite element model are obtained, the finite element model is simulated based on the modal calculation parameters, the displacement output parameters, and the extraction frequency range, the first-order modal frequency and the modal vibration mode diagram of the drive half shaft are determined according to the simulation result, and the bending modal parameters of the drive half shaft are identified according to the first-order modal frequency and the modal vibration mode diagram.

[0072] The modal calculation parameters are a set of parameters for controlling the calculation process and the result precision when modal analysis is performed; the displacement output parameters; the bending modal parameters are parameters for describing the inherent characteristics of the structure in the bending vibration mode; the frequency range is an interval in which the inherent frequency needs to be solved in the modal analysis; the simulation is a process of reproducing the behavior of the physical system under actual working conditions through numerical calculation; the first-order modal frequency is the frequency with the smallest value among all the inherent vibration frequencies; the modal vibration mode diagram is a graphical representation of the vibration form of the structure at a certain order inherent frequency in the modal analysis result; the drive half shaft is an automobile part that transmits torque while adapting to wheel jumping and steering angle changes; and the bending modal parameters are the modal parameters of the drive half shaft and other parts when they change.

[0073] It can be understood that by obtaining the modal calculation parameters, the displacement output parameters, and the bending modal parameters of the finite element model, the modal calculation parameters, the displacement output parameters, and the extraction frequency range are calculated, the simulation calculation of the finite element model is realized, the first-order modal frequency, the modal vibration mode diagram, and the identified bending modal parameters of the drive half shaft are obtained, and the modal frequency and the vibration mode are controlled.

[0074] Specifically, the bending modal parameters include modal frequency, modal vibration mode, modal stiffness, modal mass, and modal damping ratio, etc. A geometric model is created or imported in hyperworks, MSC.Nastran, or the like, a finite element model of each part is assembled in a coordinate system to obtain a finite element model of the drive half shaft, after inputting material data and processing boundary conditions, the output displacement of modal calculation is set, the structural frequency is calculated in the modal solver, the modal parameters within 1 Hz to 1000 Hz are extracted, and the first-order modal frequency of the drive half shaft and the modal vibration mode diagram as shown in Figure 8 are output.

[0075] Further, in the embodiment of the present application, the calculation formula of the first-order modal frequency is:

[0076]

[0077] wherein, is the first-order bending modal frequency of the drive half shaft, The first order bending modal frequency of the power assembly, The first order local modal frequency of the body-in-white greater than the first order bending modal frequency of the power assembly.

[0078] It can be understood that by using the calculation formula of the first order modal frequency, comparing the first order bending modal frequency of the drive half shaft with the first order bending modal frequency of the drive half shaft and the first order local modal frequency of the body-in-white greater than the first order bending modal frequency of the power assembly, the principle of designing the first order bending modal frequency of the drive half shaft is specified, the constraint modal control and modeling of the drive half shaft of the passenger car are realized, and the reliability of the first order bending modal control analysis of the drive half shaft is improved.

[0079] Specifically, if the first order bending modal of the drive half shaft does not meet the requirements of the calculation formula of the first order modal frequency, first, a hollow shaft tube or a three-section structure is used, a finite element model of the drive half shaft is obtained by assembling each component in the coordinate system, after inputting material data and processing boundary conditions, the modal frequency result is confirmed, and further optimization is performed.

[0080] The embodiment of the application obtains the modal calculation parameters, displacement output parameters, and bending modal parameters of the finite element model in the frequency range, calculates the modal calculation parameters, displacement output parameters, and extraction frequency range, realizes the simulation calculation of the finite element model, uses the calculation formula of the first order modal frequency, compares the first order bending modal frequency of the drive half shaft with the first order bending modal frequency of the drive half shaft and the first order local modal frequency of the body-in-white greater than the first order bending modal frequency of the power assembly, specifies the principle of designing the first order bending modal frequency of the drive half shaft, obtains the first order modal frequency, modal vibration mode diagram, and identified bending modal parameters of the drive half shaft, can control the modal frequency and vibration mode, realizes the constraint modal control and modeling of the drive half shaft of the passenger car, improves the reliability of the first order bending modal control analysis of the drive half shaft, and improves the performance.

[0081] In order to better understand the scheme of the application, the drive half shaft bending modal parameter identification method or execution process of the application will be described below through a specific embodiment, as shown in Figure 9 In step S901: project start.

[0082] In step S902: drive half shaft assembly three-dimensional data preparation.

[0083] After completing the data preparation of the drive half shaft finite element modeling and modal calculation analysis, the detailed parameters of the drive shaft assembly are listed, including the names of each component and the material grade. Check whether the geometric model of the drive half shaft assembly including the shaft tube, universal joint, support and connecting flange components is complete, and the material properties including the material grade, material modulus of elasticity E, material Poisson's ratio μ, and material density ρ of each component of the system. ​

[0084] In step S903: component finite element network.

[0085] Finite element unit grid selection, flange, universal joint shaft head and solid shaft tube adopt tetrahedral second-order solid element or hexahedral first-order element, hollow shaft tube adopts quadrilateral plate shell element, and universal joint adopts spring element.

[0086] In step S904: finite element model assembly.

[0087] In the software interface such as hyperworks, MSC. Nastran, etc., a local coordinate system is established, the local coordinate system of the finite element model is set, the local coordinate system is locally set at the position of the universal joint, the coordinate system direction drives the half shaft to be X direction, the direction perpendicular to the shaft tube is parallel to the ground direction Y, and the right-hand rule is used to determine Z. K1-K6 are respectively X, Y, Z translation direction and X, Y, Z rotation direction, wherein K1-K3 unit is N / mm, K4-K6 unit is N·mm / rad.

[0088] According to the actual structure and simplified mode of the driving half shaft, each component is assembled. Considering the engineering application convenience and the mutual relationship of each department unit.

[0089] In step S905: finite element model checking.

[0090] (I) Tetrahedral second-order element and hexahedral first-order element should meet the following requirements: (1) At least 2 layers of elements are divided in the thickness direction of the section, and the recommended element size is 3 mm, and the maximum element size is <6 mm; (2) 95% of the element length-width ratio is <5, and the maximum element is <10; (3) 95% of the element warping angle is <7°, and the maximum element is <10°; (4) 95% of the element twist angle is <30°, and the maximum element is <45°; (5) 95% of the element taper angle is >90%, and the minimum element is ≥60%.

[0091] (II) Quadrilateral element should meet the following requirements: (1) The number of quadrilateral elements is >95%, and the number of triangular elements is <5%; (2) The recommended element size is 3 mm, and the maximum element size is <6 mm; (3) 95% of the element warping angle is <7°, and the total element warping angle is <10°; (4) 95% of the element length-width ratio is <5, and the total element length-width ratio is <7; (5) 95% of the element twist angle is <30°, and the total element twist angle is <40°; (6) 95% unit Jacobian edge <0.7, all unit Jacobian edge <0.3; (7) 95% unit taper <0.7, all unit taper <0.8; (8) 95% unit maximum angle <120°, not meet the unit maximum angle to be less than 135°.

[0092] In step S906: set material properties.

[0093] The model shaft tube two-dimensional unit should be given material name, two-dimensional unit thickness, Young's modulus, Poisson's ratio, density, for solid element should be given material name, Young's modulus, Poisson's ratio, density.

[0094] In step S907: set model boundary conditions.

[0095] The driving half shaft uses rigid constraint at both ends.

[0096] Solid grid modeling is completed, and the following checks need to be performed on the part finite element model when the model is output: (1) Check the geometry cleaning information, the finite element model does not contain line, surface and other geometric information; (2) Check the internal unit connection of the part; (3) Check if there are duplicate units; (4) Check the material properties of the parts; (5) Check the part quality information, which is within 3% of the geometric sample in the three-dimensional modeling software; In step S908: modal extraction below 500Hz.

[0097] Solution setting: modal calculation setting, set displacement output, submit modal solver calculation, extract modal parameters within 1 Hz-500Hz.

[0098] In step S909: result analysis.

[0099] Output the first-order modal frequency and modal shape diagram of the driving half shaft.

[0100] In step S910: end.

[0101] In summary, the embodiment of the present application proposes a driving half shaft bending modal parameter identification method. The three-dimensional data of the driving half shaft assembly is processed to generate a finite element network of each component. A coordinate system is established in a software interface, a finite element model that meets the integrity condition is assembled, a consistent unit system is used, spring stiffness is converted, material data is assigned, and boundary conditions are added to obtain the finite element model of the driving half shaft. The first-order modal frequency calculation formula is used to obtain the first-order modal frequency, modal shape diagram, and identified bending modal parameters of the driving half shaft, thereby realizing fast modeling of the finite element and regulation of the modeling calculation method, ensuring the consistency of the first-order bending calculation modal and the test modal of the driving half shaft assembly, and improving the efficiency of the finite element network establishment and the accuracy of the result analysis.

[0102] Secondly, the driving half shaft bending modal parameter identification device according to the embodiment of the present application is described with reference to the accompanying drawings.

[0103] Figure 10 FIG. 1 is a block schematic diagram of the driving half shaft bending modal parameter identification device according to the embodiment of the present application.

[0104] As shown in FIG. 1, the driving half shaft bending modal parameter identification device 1000 includes an acquisition module 1001, a generation module 1002, an assignment module 1003, and an output module 1004. Figure 10

[0105] The acquisition module 1001 is configured to acquire the three-dimensional data of the driving half shaft assembly. The generation module 1002 is configured to generate a finite element network of each component of the driving half shaft according to the three-dimensional data of the assembly. The assignment module 1003 is configured to generate a finite element model of each component according to the finite element network of each component, generate a finite element model of the driving half shaft according to the finite element model of each component, assign material data and boundary conditions to the finite element model. The output module 1004 is configured to acquire modal calculation parameters, displacement output parameters, and extraction frequency range of the bending modal parameters of the finite element model, simulate the finite element model based on the modal calculation parameters, displacement output parameters, and extraction frequency range, determine the first-order modal frequency and modal shape diagram of the driving half shaft according to the simulation result, and identify the bending modal parameters of the driving half shaft according to the first-order modal frequency and modal shape diagram.

[0106] Further, in the embodiment of the present application, the calculation formula of the first-order modal frequency is as follows:

[0107]

[0108] wherein, is the first-order bending modal frequency of the driving half shaft, is the first-order bending modal frequency of the power assembly, ​The first local modal frequency of the body-in-white is greater than the first order bending modal frequency of the power assembly.

[0109] Further, in the embodiment of the present application, the generating module 1002 is further configured to: identify the geometric model of each component in the assembly three-dimensional data; and perform mesh processing on the geometric model of each component to obtain the finite element network of each component, wherein the flange and solid pipe in each component are processed as a solid network, and the idle shaft pipe in each component is processed as a two-dimensional network.

[0110] Further, in the embodiment of the present application, the assigning module 1003 is further configured to: detect whether the finite element model of each component satisfies the completeness condition; if the finite element model of each component satisfies the completeness condition, establish a coordinate system in a software interface to drive the half shaft as the X direction, the vertical shaft pipe parallel to the ground direction as the Y direction, and determine the Z direction by using the right-hand rule; and assemble the finite element model of each component in the coordinate system to obtain the finite element model of the drive half shaft.

[0111] Further, in the embodiment of the present application, the assigning module 1003 is further configured to: detect whether the finite element model of each component satisfies the completeness condition, including: if the finite element model of each component includes the finite element model of the shaft pipe, the finite element model of the universal joint, the finite element model of the bracket, and the finite element model of the connecting flange, it is determined that the finite element model of each component satisfies the completeness condition.

[0112] Further, in the embodiment of the present application, the drive half shaft bending modal parameter identification device 1000 of the embodiment further comprises: an identifying module.

[0113] Further, in the embodiment of the present application, the assigning module 1003 is further configured to: detect whether the finite element model of each component satisfies the completeness condition, including: if the finite element model of each component includes the finite element model of the shaft pipe, the finite element model of the universal joint, the finite element model of the bracket, and the finite element model of the connecting flange, it is determined that the finite element model of each component satisfies the completeness condition.

[0114] Further, in the embodiment of the present application, the material data includes model shaft pipe two-dimensional element data and solid element data, the model shaft pipe two-dimensional element data includes at least one of a material name, a two-dimensional element thickness, a Young's modulus, a Poisson's ratio, and a density, the solid element data includes at least one of a material name, a Young's modulus, a Poisson's ratio, and a density, and the boundary condition includes rigid constraints at both ends of the drive half shaft.

[0115] It should be noted that the foregoing explanation and description of the drive half shaft bending modal parameter identification method embodiment also apply to the drive half shaft bending modal parameter identification device of this embodiment, which will not be described here.

[0116] In summary, according to the drive half shaft bending modal parameter identification device provided by the embodiment of the application, the three-dimensional data of the identified drive half shaft assembly is processed to generate a finite element network of each component, a coordinate system is established in a software interface, a finite element model that meets the integrity condition is assembled, a consistent unit system is used, spring stiffness is converted, material data is assigned, and a boundary condition is added, so as to obtain the finite element model of the drive half shaft, and the first-order modal frequency calculation formula is used to obtain the first-order modal frequency, the modal vibration mode diagram, and the identified drive half shaft bending modal parameter of the drive half shaft, the rapid modeling of the finite element and the regulation of the modeling calculation method are realized, the consistency of the first-order bending calculation modal and the test modal of the drive half shaft assembly is ensured, and the efficiency of the finite element network establishment and the result analysis accuracy are improved.

[0117] Figure 11 A structural schematic diagram of an electronic device is provided for the embodiment of the application. The electronic device 1100 can include: a memory 1101, a processor 1102, and a computer program stored in the memory 1101 and executable on the processor 1102.

[0118] The processor 1102 implements the drive half shaft bending modal parameter identification method provided in the above embodiment when executing the program.

[0119] Further, the electronic device further includes: a communication interface 1103 for communication between the memory 1101 and the processor 1102.

[0120] The memory 1101 is used to store the computer program executable on the processor 1102.

[0121] The memory 1101 can include a high-speed RAM (Random Access Memory, Random Access Memory) memory, and can also include a non-volatile memory, such as at least one disk memory.

[0122] If the memory 1101, the processor 1102, and the communication interface 1103 are independently implemented, the communication interface 1103, the memory 1101, and the processor 1102 can be connected to each other through a bus and complete communication between each other. The bus can be an ISA (Industry Standard Architecture, Industry Standard Architecture) bus, a PCI (Peripheral Component, Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture, Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 11Only one bus or only one type of bus can exist, however.

[0123] Optionally, in a specific implementation, if the memory 1101, the processor 1102 and the communication interface 1103 are integrated on a chip, the memory 1101, the processor 1102 and the communication interface 1103 can complete the communication with each other through an internal interface.

[0124] The processor 1102 can be a CPU (Central Processing Unit, central processor), or an ASIC (Application Specific Integrated Circuit, specific integrated circuit), or an integrated circuit configured to implement one or more embodiments of the application.

[0125] The embodiment of the application further provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the driving half-shaft bending modal parameter identification method.

[0126] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" 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 application. In the specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0127] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "N" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0128] Any process or method described in a flowchart or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing the specified logical functions or steps, and the various embodiments of the application include alternative implementations of the described processes or methods, in which the order of steps can be changed, including the use of simultaneous steps or reverse order of steps, where necessary and / or desirable, and in which certain steps can be combined, deleted, modified, or changed to other data processing procedures, as will be apparent to those skilled in the art.

[0129] It should be understood that portions of the application can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, or a combination thereof, can be used: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays, field programmable gate arrays, and the like.

[0130] Those of ordinary skill in the art can understand that all or part of the steps carried out by the method of the above-mentioned embodiments can be completed by programs instructing relevant hardware, and the above-mentioned programs can be stored in a computer readable storage medium, and when the program is executed, it includes one or a combination of the steps of the method embodiment.

[0131] Although the embodiments of the application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the application.

Claims

1. A drive shaft bending modal parameter identification method, characterized in that, The method comprises the following steps: acquiring assembly three-dimensional data of a driving half shaft; generating finite element networks of each component of the driving half shaft according to the assembly three-dimensional data; generating finite element models of each component according to the finite element networks of each component, generating a finite element model of the driving half shaft according to the finite element models of each component, and assigning material data and boundary conditions to the finite element model; acquiring modal calculation parameters, displacement output parameters, and extraction frequency range of bending modal parameters of the finite element model, simulating the finite element model based on the modal calculation parameters, the displacement output parameters, and the extraction frequency range, determining a first-order modal frequency and a modal vibration mode diagram of the driving half shaft according to a simulation result, and identifying the bending modal parameters of the driving half shaft according to the first-order modal frequency and the modal vibration mode diagram.

2. The drive half shaft bending modal parameter identification method of claim 1, wherein, The calculation formula of the first-order modal frequency is: wherein, is the first order bending mode frequency of the half shaft, is the first order bending mode frequency of the powertrain, is the first order local mode frequency of the body-in-white greater than the first order bending mode of the powertrain.

3. The drive shaft bending modal parameter identification method of claim 1, wherein, The generating of the finite element networks of each component of the driving half shaft according to the assembly three-dimensional data comprises: identifying geometric models of each component in the assembly three-dimensional data; performing grid processing on the geometric models of each component to obtain finite element networks of each component, wherein flanges and solid pipes in each component are processed as entity networks, and hollow shaft pipes in each component are processed as two-dimensional networks.

4. The drive shaft bending modal parameter identification method of claim 1, wherein, The generating of the finite element model of the driving half shaft according to the finite element models of each component comprises: detecting whether the finite element models of each component satisfy a completeness condition; if the finite element models of each component satisfy the completeness condition, establishing a coordinate system in a software interface, taking the driving half shaft as an X direction, taking a direction parallel to the ground and perpendicular to the shaft pipe as a Y direction, and determining a Z direction by using a right-hand rule; assembling the finite element models of each component in the coordinate system to obtain the finite element model of the driving half shaft.

5. The drive half shaft bending modal parameter identification method of claim 4, wherein, The detection of whether the finite element models of each component satisfy the completeness condition comprises: if it is detected that the finite element models of each component include finite element models of shaft pipes, finite element models of universal joints, finite element models of supports, and finite element models of connecting flanges, it is determined that the finite element models of each component satisfy the completeness condition.

6. The drive half shaft bending modal parameter identification method of claim 4, wherein, Before the assembling of the finite element models of each component in the coordinate system to obtain the finite element model of the driving half shaft, the method further comprises: identifying the universal joints in each component, and simplifying the universal joints into spring stiffness.

7. The drive shaft bending modal parameter identification method of claim 1, wherein, The material data includes model shaft pipe two-dimensional unit data and entity unit data, the model shaft pipe two-dimensional unit data includes at least one of a material name, a two-dimensional unit thickness, a Young's modulus, a Poisson's ratio, and a density, the entity unit data includes at least one of a material name, a Young's modulus, a Poisson's ratio, and a density, and the boundary conditions include rigid constraints at two ends of the driving half shaft.

8. A device for driving a half-shaft bending modal parameter identification, characterized in that, The method comprises: an acquiring module configured to acquire assembly three-dimensional data of a driving half shaft; a generating module configured to generate finite element networks of each component of the driving half shaft according to the assembly three-dimensional data; The module is configured to generate a finite element model of each component according to the finite element network of each component, generate a finite element model of the drive half shaft according to the finite element model of each component, and assign material data and boundary conditions to the finite element model; The output module is configured to obtain modal calculation parameters, displacement output parameters, and a frequency range for extracting a bending modal parameter of the finite element model, perform simulation on the finite element model based on the modal calculation parameters, the displacement output parameters, and the frequency range, determine a first-order modal frequency and a modal vibration mode diagram of the drive half shaft according to a simulation result, and identify the bending modal parameter of the drive half shaft according to the first-order modal frequency and the modal vibration mode diagram.

9. An electronic device, comprising: The method comprises: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the drive half shaft bending modal parameter identification method according to any one of claims 1-7.

10. A computer readable storage medium having stored thereon a computer program or instructions, characterized in that, The computer program or instructions are executed to implement the drive half shaft bending modal parameter identification method according to any one of claims 1-7.

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