CN114139414A - Vehicle battery bracket assembly performance testing method, device, equipment and medium - Google Patents
Vehicle battery bracket assembly performance testing method, device, equipment and medium Download PDFInfo
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Abstract
The application relates to a vehicle battery bracket assembly performance testing method, device, equipment and medium. The method comprises the following steps: acquiring a finite element model of the bracket assembly, and determining an acceleration load according to the mass and the test acceleration of the finite element model of the bracket assembly; applying an acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack, and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied; determining whether the strength of the finite element model of the bracket assembly reaches the standard or not according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly; and determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data. Before the bracket assembly is actually installed on a vehicle, the bracket assembly can be tested in a software simulation mode, the performance of the bracket assembly is determined, the time for testing the performance of the bracket assembly is shortened, and the cost is saved.
Description
Technical Field
The present disclosure relates to vehicle testing technologies, and in particular, to a method, an apparatus, a device and a medium for testing performance of a vehicle battery bracket assembly.
Background
With the development of vehicle technology and the increasing emphasis on environment. In order to reduce environmental pollution and promote sustainable development, new energy automobiles, especially electric automobiles, are increasingly used. The requirement of people on the endurance mileage of the electric automobile is higher and higher, in order to improve the endurance of the electric automobile, the capacity and the mass of the battery pack are continuously increased, and the heavier the mass of the battery pack is, the higher the performance requirement on the vehicle battery bracket assembly is. Therefore, in order to ensure safe driving of the vehicle, a performance test of the battery bracket assembly is required.
Conventionally, the performance of a battery bracket assembly is determined based on experimental data by mounting the battery bracket assembly made of different materials on an actual vehicle and then performing a series of experiments using the actual vehicle.
However, the conventional method requires many experiments with an actual vehicle and an actual battery carrier assembly to determine the performance of the battery carrier assembly, resulting in a long test period and high cost.
Disclosure of Invention
In view of the above, it is desirable to provide a vehicle battery carrier assembly performance testing method, apparatus, device and medium that can test the performance of a battery carrier assembly before the battery carrier assembly is actually mounted on a vehicle.
A method of testing the performance of a vehicle battery carrier assembly, the carrier assembly comprising a carrier, a rail, and a battery pack, the method comprising: acquiring a finite element model of the bracket assembly, wherein the finite element model of the bracket assembly comprises a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack, and the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack comprise a plurality of grid elements which are connected into a whole; determining an acceleration load according to the mass of the finite element model of the bracket assembly and the test acceleration; applying the acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack, and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied; determining whether the strength of the finite element model of the bracket assembly meets the standard according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly; and determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data.
In one embodiment, the obtaining the finite element model of the bracket assembly comprises: acquiring a three-dimensional model of the bracket, a three-dimensional model of the longitudinal beam and a three-dimensional model of the battery pack; acquiring material parameters of the bracket, the longitudinal beam and the battery pack; setting a density of a three-dimensional model of the bracket according to the material parameters of the bracket; setting the density of the three-dimensional model of the longitudinal beam according to the material parameters of the longitudinal beam; setting the density of the three-dimensional model of the battery pack according to the material parameters of the battery pack; the three-dimensional model of the bracket, the three-dimensional model of the longitudinal beam and the three-dimensional model of the battery pack after density adjustment are subjected to grid division, the three-dimensional model of the bracket, the three-dimensional model of the longitudinal beam and the three-dimensional model of the battery pack are divided into a plurality of grid units which are connected into a whole and meet a set size target, and a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack are obtained; and forming a finite element model of the bracket assembly by using the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack.
In one embodiment, the meshing the density-adjusted three-dimensional model of the bracket, the three-dimensional model of the stringer, and the three-dimensional model of the battery pack, and the meshing the three-dimensional model of the bracket, the three-dimensional model of the stringer, and the three-dimensional model of the battery pack into a plurality of integrally connected mesh elements satisfying a predetermined size target to obtain the finite element model of the bracket, the finite element model of the stringer, and the finite element model of the battery pack includes: if the bracket is a stamping bracket, modeling a three-dimensional model of the bracket by adopting a two-dimensional unit to obtain a two-dimensional finite element model of the bracket; and if the bracket is a cast bracket, modeling the three-dimensional model of the bracket by adopting a three-dimensional unit to obtain a three-dimensional finite element model of the bracket, and converting the three-dimensional finite element model into a two-dimensional finite element model of the bracket by using finite element pretreatment software.
In one embodiment, the determining the acceleration load based on the mass of the finite element model of the carrier assembly and the test acceleration comprises: acquiring the test acceleration, wherein the test acceleration is measured by a three-phase acceleration sensor arranged on a bracket assembly of an actual vehicle; and determining the acceleration load according to the test acceleration, the mass of the finite element model of the bracket, the mass of the finite element model of the longitudinal beam and the mass of the finite element model of the battery pack.
In one embodiment, before determining the acceleration load based on the test acceleration, the mass of the finite element model of the bracket, the mass of the finite element model of the stringer, and the mass of the finite element model of the battery pack, the method further comprises: carrying out constraint modal analysis on the finite element model of the bracket assembly to obtain a modal shape of the finite element model of the bracket assembly; and if the difference value of the modal shape of the finite element model of the bracket assembly and the frequency of the preset modal shape is within a preset range, judging that the finite element model of the bracket assembly reaches the standard.
In one embodiment, before said applying said acceleration load to the connection of said finite element model of said carrier and said finite element model of said battery pack, determining stress data, displacement data, and strain data of said finite element model of said carrier assembly after said applying said acceleration load, said method further comprises: establishing contact pairs at all connecting positions among the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack by using pretreatment software; using pre-processor software, constraining the degrees of freedom of the finite element model of the stringer in the transverse direction, the longitudinal direction and the vertical direction.
In one embodiment, the determining whether the strength of the finite element model of the bracket assembly meets the standard is performed according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly; the method comprises the following steps: determining a safety coefficient of the finite element model of the bracket assembly according to the stress data, the strain data, the material parameters of the finite element model of the bracket, the material parameters of the finite element model of the longitudinal beam and the material parameters of the finite element model of the battery pack, and judging that the strength of the finite element model of the bracket assembly reaches the standard if the safety coefficient is greater than a safety coefficient threshold value or the maximum value of the stress data is smaller than a tensile strength limit value of a material used at a position corresponding to the maximum value of the stress data; determining whether the stiffness of the finite element model of the bracket assembly meets the standard according to the displacement data comprises: and determining whether the displacement amounts of the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack in the preset direction are all smaller than corresponding displacement amount thresholds or not according to the displacement data, and if the displacement amounts of the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack in the preset direction are all smaller than the corresponding displacement amount thresholds, judging that the rigidity of the finite element model of the bracket assembly reaches the standard.
A vehicle battery carrier assembly performance testing apparatus, the apparatus comprising:
the model acquisition module is used for acquiring a finite element model of the bracket assembly, the finite element model of the bracket assembly comprises a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack, and the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack all comprise a plurality of grid units which are connected into a whole;
the load determining module is used for determining the acceleration load according to the mass of the finite element model of the bracket assembly and the test acceleration;
the data determination module is used for applying the acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied;
the strength judging module is used for determining whether the strength of the finite element model of the bracket assembly reaches the standard or not according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly;
and the rigidity judging module is used for determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring a finite element model of the bracket assembly, wherein the finite element model of the bracket assembly comprises a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack, and the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack comprise a plurality of grid elements which are connected into a whole; determining an acceleration load according to the mass of the finite element model of the bracket assembly and the test acceleration; applying the acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack, and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied; determining whether the strength of the finite element model of the bracket assembly meets the standard according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly; and determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring a finite element model of the bracket assembly, wherein the finite element model of the bracket assembly comprises a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack, and the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack comprise a plurality of grid elements which are connected into a whole; determining an acceleration load according to the mass of the finite element model of the bracket assembly and the test acceleration; applying the acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack, and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied; determining whether the strength of the finite element model of the bracket assembly meets the standard according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly; and determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data.
The vehicle battery bracket assembly performance test method, device, equipment and medium. The method comprises the steps of firstly obtaining a finite element model of the bracket assembly, thus obtaining a model corresponding to the actual bracket assembly, and subsequently modifying and testing the model more conveniently than using the actual bracket assembly for testing. And then determining the magnitude of the acceleration load according to the mass of the finite element model of the bracket assembly and the acceleration applied to the finite element model of the bracket assembly, and applying the acceleration load to the connection part of the finite element model of the bracket and the finite element model of the battery pack to obtain stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied. Therefore, a simulation experiment is carried out on the bracket assembly, and corresponding simulation test data are obtained. Determining whether the strength of the finite element model of the bracket assembly reaches the standard or not according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly; and determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data. By the method, the bracket assembly can be tested in a software simulation mode before being actually installed on the vehicle, and the performance of the bracket assembly is determined, so that the bracket assembly does not need to be tested through multiple experiments. The time for testing the performance of the bracket assembly is shortened, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for testing the performance of a vehicle battery carrier assembly according to one embodiment;
FIG. 2 is a schematic structural view of a bracket assembly according to an embodiment;
FIG. 3 is a schematic diagram of a vertical force applied to the carriage assembly in one embodiment;
FIG. 4 is a schematic illustration of a bracket assembly under lateral force in one embodiment;
FIG. 5 is a schematic view of a carriage assembly under longitudinal force in one embodiment;
FIG. 6 is a graphical illustration of a material fatigue versus stress curve for one embodiment;
FIG. 7 is an interface diagram of preprocessing software in one embodiment;
FIG. 8 is a stress cloud of a bracket according to one embodiment;
FIG. 9 is a stress cloud of the bracket assembly in one embodiment;
FIG. 10 is a schematic illustration of an acceleration load spectrum in one embodiment;
FIG. 11 is a block diagram of an exemplary vehicle battery carrier assembly performance testing apparatus;
FIG. 12 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Description of reference numerals: 10-bracket, 20-longitudinal beam and 30-battery pack.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
As discussed in the background, prior art methods of determining the performance of a battery carrier assembly have a relatively long test cycle and are relatively costly. The inventor finds that the problem is caused by the fact that in the prior art, an actual battery bracket assembly is mounted on a vehicle for test, and is adjusted according to experience and then repeatedly tested until the required performance requirement is met, so that the actual battery bracket assembly is required to be used for testing, the cost is high, and the testing period is long.
For the foregoing reasons, the present invention provides a vehicle battery carrier assembly performance testing method, apparatus, device and medium that is capable of testing the performance of a battery carrier assembly prior to the battery carrier assembly being actually installed on a vehicle.
In one embodiment, as shown in fig. 1, a method for testing the performance of a vehicle battery carrier assembly is provided, the carrier assembly comprising a carrier, a rail, and a battery pack, the method comprising:
and S100, acquiring a finite element model of the bracket assembly.
Specifically, the finite element model of the bracket assembly comprises a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack, and the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack all comprise a plurality of grid elements which are connected into a whole.
And step S110, determining the acceleration load according to the mass of the finite element model of the bracket assembly and the test acceleration.
And step S120, applying an acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack, and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied.
Specifically, as shown in fig. 2, the bracket assembly is composed of a bracket 10, a longitudinal beam 20, and a battery pack 30. After the acceleration load is determined, it is applied to the carriage assembly in different directions, as shown in fig. 3, in which the direction of the arrow is the direction of application of the acceleration load, and in fig. 3, the acceleration load is applied in the vertical direction. As shown in fig. 4, an acceleration load is applied along the side. As shown in fig. 5, an acceleration load is applied in the longitudinal direction.
And step S130, determining whether the strength of the finite element model of the bracket assembly reaches the standard or not according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly.
And step S140, determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data.
In this embodiment, the finite element model of the bracket assembly is obtained first, so that a model corresponding to the actual bracket assembly is obtained, and the subsequent model modification and test are more convenient than the actual bracket assembly. And then determining the magnitude of the acceleration load according to the mass of the finite element model of the bracket assembly and the acceleration applied to the finite element model of the bracket assembly, and applying the acceleration load to the connection part of the finite element model of the bracket and the finite element model of the battery pack to obtain stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied. Therefore, a simulation experiment is carried out on the bracket assembly, and corresponding simulation test data are obtained. Determining whether the strength of the finite element model of the bracket assembly reaches the standard or not according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly; and determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data. By the method, the bracket assembly can be tested in a software simulation mode before being actually installed on the vehicle, and the performance of the bracket assembly is determined, so that the bracket assembly does not need to be tested through multiple experiments. The time for testing the performance of the bracket assembly is shortened, and the cost is saved.
In one embodiment, step S100 includes:
step S1002, a three-dimensional model of the bracket, a three-dimensional model of the longitudinal beam and a three-dimensional model of the battery pack are obtained.
Step S1004, a material parameter of the bracket, a material parameter of the side member, and a material parameter of the battery pack are acquired.
In particular, the material parameters include modulus of elasticity, poisson's ratio, tensile strength, yield strength, density, fatigue curve of the material.
Illustratively, the material parameters for the QT450 material are shown in the following table.
TABLE I QT450 Material parameters
As shown in FIG. 6, the S/N (fatigue) curve of QT450 material is plotted with the fatigue strength on the ordinate and the fatigue life on the abscissa.
Step S1006, setting the density of the three-dimensional model of the bracket according to the material parameters of the bracket. And setting the density of the three-dimensional model of the longitudinal beam according to the material parameters of the longitudinal beam. The density of the three-dimensional model of the battery pack is set according to the material parameters of the battery pack.
Specifically, the density is adjusted so that the density is set to correspond to the material used for the bracket, the side member, and the battery pack, respectively.
Illustratively, as shown in FIG. 7, a software interface diagram for setting density in pre-processing software.
And step S1008, performing grid division on the density-adjusted three-dimensional model of the bracket, the three-dimensional model of the longitudinal beam and the three-dimensional model of the battery pack, and dividing the three-dimensional model of the bracket, the three-dimensional model of the longitudinal beam and the three-dimensional model of the battery pack into a plurality of grid units which are connected into a whole and meet the set size target to obtain a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack.
Specifically, if the bracket is a stamped bracket, the stamped bracket is manufactured by a steel plate stamping forming processing mode, so that the thicknesses of the plates at all positions are equal, and the real attributes of the plates can be better reflected by selecting two-dimensional unit modeling. And modeling the three-dimensional model of the bracket by adopting a two-dimensional unit to obtain a two-dimensional finite element model of the bracket.
If the bracket is a casting bracket, the casting bracket is manufactured in a mode that molten steel is poured into a mold for molding, so that the thickness of each position of the bracket is different and the difference is large, and therefore three-dimensional unit modeling is needed, the three-dimensional model of the bracket is modeled by adopting three-dimensional units, a three-dimensional finite element model of the bracket is obtained, and then finite element preprocessing software is used for converting the three-dimensional finite element model into a two-dimensional finite element model of the bracket.
Illustratively, in the preprocessing software Hypermesh of Altair corporation, USA, a three-dimensional model is converted into a two-dimensional model using the following operation steps, 3D → order change → selection unit → change to2nd → return.
Specifically, the set size target is that the size of the grid unit can truly show the structural characteristics of the component, such as chamfering and bending, the bending part on the component has an arc-shaped curved surface, the chamfering is the position of the arc-shaped structure at the joint of two surfaces determined by the component design drawing, and the size of the grid unit can show the characteristics of the component.
And step S1010, forming the finite element model of the bracket assembly by the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack.
In this embodiment, a three-dimensional model of the bracket, a three-dimensional model of the longitudinal beam, and a three-dimensional model of the battery pack are obtained, then a material parameter of the bracket, a material parameter of the longitudinal beam, and a material parameter of the battery pack are obtained, and then the density of the three-dimensional model of the bracket is set according to the material parameter of the bracket; setting the density of a three-dimensional model of the longitudinal beam according to the material parameters of the longitudinal beam; the density of the three-dimensional model of the battery pack is set according to the material parameters of the battery pack. Resulting in a model constructed using the material to be tested. And then, the model is subjected to grid division so as to be divided into a plurality of grid units meeting the set size target, so that the subsequent simulation is facilitated. And finally, forming the finite element model of the bracket assembly by the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack to obtain the finite element model of the bracket assembly. Thereby providing a simulation model for simulation testing with the same parameters as the actual bracket assembly. And the simulation test is convenient.
Specifically, before step S1008, the method further includes: and using preprocessing software to geometrically clean the three-dimensional model of the bracket, the three-dimensional model of the longitudinal beam and the three-dimensional model of the battery pack, and deleting the parts, of the three-dimensional model of the bracket, the three-dimensional model of the longitudinal beam and the three-dimensional model of the battery pack, of which the sizes are below a preset size and which do not influence the geometric appearance of the models. And redundant and tiny modeling flaws are eliminated, and distal stringers and other unnecessary parts in the model, which have small relation with the rigidity and the strength of the concerned module, are eliminated. Wherein, the far-end longitudinal beam is a longitudinal beam section outside the intercepting range; the unnecessary parts with small relation with the module rigidity strength refer to parts such as a plate spring support, other side-hung accessory supports and the like, and the parts are installed on the longitudinal beam and are not connected with the side-hung module support analyzed in the text, and the influence of the part on the module rigidity strength is small and can be ignored.
In one embodiment, step S110 includes:
step S1102, a test acceleration is acquired.
Specifically, the test acceleration is measured by a three-phase acceleration sensor mounted on a bracket assembly of the actual vehicle.
And step S1104, determining an acceleration load according to the test acceleration, the mass of the finite element model of the bracket, the mass of the finite element model of the longitudinal beam and the mass of the finite element model of the battery pack.
Specifically, the acceleration load can be determined from the mass and acceleration according to the formula F ═ ma, where F is the force, m is the mass of the battery pack, and a is the test acceleration. In addition, the mass distribution of the battery pack can cause different force arms of stress, and the stress is also influenced.
For example, using Abaqus software, a stress cloud of the bracket after the acceleration load is applied can be obtained by introducing the acceleration load into a finite element model of the bracket assembly, and the stress cloud is shown in fig. 8 and 9. Fig. 8 is a stress cloud picture of the bracket when being stressed, and according to the stress cloud picture of the bracket when being stressed, a user can visually check the stress condition of each part of the bracket, so that the material or the structure of the bracket can be improved according to the stress cloud picture. Fig. 9 is a cloud image of displacement when the battery pack is stressed, and according to the cloud image of displacement of each part when the battery pack is stressed, a user can visually check the displacement of how many millimeters each position of the battery pack generates under the current working condition, so that whether the battery pack collides with other structures can be judged.
For example, the load spectrum of the acceleration load is as shown in fig. 10, and if the loading condition is a static load condition, the applied acceleration load is an extreme value of the load spectrum. The fatigue load value is the average amplitude of the load spectrum.
In the embodiment, acceleration data of an actual vehicle in operation is obtained through a three-phase acceleration sensor, and the magnitude of the acceleration load is determined according to the acceleration data and the mass set by the finite element model. Therefore, the simulation method can simulate the force applied to the vehicle in the actual running process when the real bracket assembly is installed on the vehicle, and the simulation result is closer to the actual result.
In one embodiment, before step S110, the method further comprises:
and S200, carrying out constraint modal analysis on the finite element model of the bracket assembly to obtain a modal shape of the finite element model of the bracket assembly.
Illustratively, the validity and usability of the established finite element model are verified by performing constrained modal analysis on the finite element model and comparing with the bench test results. If the constrained mode analysis result shows that the first three natural frequencies are 31.2Hz, 42Hz and 44.5Hz respectively, the description of each mode is shown in Table II.
TABLE II, vibration mode description
According to the simulation analysis result, the first-order natural frequency of the constrained mode analysis of the battery pack shell finite element model is 31.2Hz, the first-order natural frequency measured by the bench test is 32Hz, the relative error is 2.5 percent, and the relative error is small, so that the established finite element model can be used for subsequent optimization analysis.
Step S220, if the difference value of the modal shape of the finite element model of the bracket assembly and the preset frequency of the modal shape is within a preset range, judging that the finite element model of the bracket assembly reaches the standard.
Illustratively, constrained modality analysis is performed using the Abaqus software, with the modality calculation instructions: FREQUENCY, egensolver, LANCZOS, and outputs the modal shape of the first 20 steps, and the modal shape of the first 20 steps is analyzed because the FREQUENCY of the vehicle bumping on the road surface is within 200Hz due to accumulated experience.
In this embodiment, the modal shape of the finite element model of the bracket assembly may be obtained by performing constrained modal analysis on the finite element model of the bracket assembly, and then whether the finite element model meets the standard may be determined according to the difference of the frequencies.
In one embodiment, before step S120, the method further comprises:
and step S300, establishing contact pairs at all connecting positions among the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack by using preprocessing software.
And S320, constraining the degrees of freedom of the finite element model of the longitudinal beam in the transverse direction, the longitudinal direction and the vertical direction by using preprocessor software.
In the embodiment, by establishing the contact pair at the connection, the contact place between the models is defined, and the relative motion generated after the two components are loaded with acceleration load in the simulation process is avoided. The reality is that the two parts are in contact and conduct force, and if a contact pair is not established, the two parts can penetrate through each other without being in contact after moving, so that the simulation result is distorted or cannot be converged. The constraint freedom also makes the motion of the model after being stressed consistent with the reality.
In one embodiment, step S130 includes:
and determining the safety coefficient of the finite element model of the bracket assembly according to the stress data, the strain data, the material parameters of the finite element model of the bracket, the material parameters of the finite element model of the longitudinal beam and the material parameters of the finite element model of the battery pack, and judging that the strength of the finite element model of the bracket assembly reaches the standard if the safety coefficient is greater than a safety coefficient threshold value or the maximum value of the stress data is smaller than the tensile strength limit value of the material used at the position corresponding to the maximum value of the stress data.
Specifically, the stress data, the strain data, the material parameters of the Finite Element model of the bracket, the material parameters of the Finite Element model of the stringer, and the material parameters of the Finite Element model of the battery pack are imported into femfat (finished Element Method and Fatigue, Fatigue strength and optimization analysis) software, so that the safety factor of the bracket assembly can be determined. The evaluation criteria for the safety factor are accumulated from past experience, for example: under the condition that the prior similar structure is under the similar load, the calculation safety coefficient exceeds 1.0, and the structure is not damaged in the actual use process, the part with the calculation result safety coefficient exceeding 1.0 is considered to be qualified, and the subsequent evaluation of the type of structure uses the standard that the safety coefficient is larger than 1.0.
If the accumulated empirical data are not available for reference, the maximum stress value borne by the stressed position of the bracket assembly is determined to be smaller than the tensile strength limit value of the material at the position according to the stress data.
In this embodiment, the safety factor of the bracket assembly is determined according to the stress data, the strain data, the material parameters of the finite element model of the bracket, the material parameters of the finite element model of the longitudinal beam, and the material parameters of the finite element model of the battery pack, and then whether the strength of the bracket assembly reaches the standard is judged according to the safety factor. If the reference safety factor does not exist, conservative estimation is carried out, and the strength reaches the standard when the tensile strength limit value of the material is larger than the maximum stress value. Therefore, whether the strength of the bracket assembly reaches the standard or not can be accurately judged.
In one embodiment, step S140 includes:
and determining whether the displacement amounts of the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack in the preset direction are all smaller than the corresponding displacement amount threshold value or not according to the displacement data, and if the displacement amounts of the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack in the preset direction are all smaller than the corresponding displacement amount threshold value, judging that the rigidity of the finite element model of the bracket assembly reaches the standard.
For example, the evaluation standard of the rigidity of the bracket is determined according to the requirements of actual space and displacement, for example, the clearance between other parts around the battery pack and the bracket is only 10mm, so that the displacement of the whole structure in the direction needs to be less than 10mm to be qualified, otherwise, the whole structure can collide with other structures.
In this embodiment, displacement amounts of the finite element model of the bracket, the finite element model of the longitudinal beam, and the finite element model of the battery pack in the preset direction are obtained through loading simulation, and if the displacement amount is smaller than a displacement amount threshold value according to an actual requirement, it represents that the rigidity of the bracket assembly reaches the standard.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, as shown in fig. 11, there is provided a vehicle battery carrier assembly performance testing apparatus, the apparatus comprising: the system comprises a model acquisition module 901, a load determination module 902, a data determination module 903, a strength judgment module 904 and a rigidity judgment module 905. Wherein:
the model acquisition module 901 is used for acquiring a finite element model of the bracket assembly, wherein the finite element model of the bracket assembly comprises a finite element model of a bracket, a finite element model of a longitudinal beam and a finite element model of a battery pack, and the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack all comprise a plurality of grid units which are connected into a whole;
a load determining module 902, configured to determine an acceleration load according to a mass of the finite element model of the bracket assembly and a received acceleration;
the data determining module 903 is used for applying an acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack, and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied;
the strength judging module 904 is used for determining whether the strength of the finite element model of the bracket assembly reaches the standard according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly;
and the rigidity judging module 905 is used for determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data.
For specific limitations of the vehicle battery bracket assembly performance testing device, reference may be made to the above limitations of the vehicle battery bracket assembly performance testing method, which will not be described herein again. The modules in the vehicle battery bracket assembly performance testing device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In one embodiment, a computer device is provided, the internal structure of which may be as shown in fig. 12. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a post-guard structure optimization method.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the above-described method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A vehicle battery bracket assembly performance testing method is characterized in that the bracket assembly comprises a bracket, a longitudinal beam and a battery pack, and the method comprises the following steps:
acquiring a finite element model of the bracket assembly, wherein the finite element model of the bracket assembly comprises a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack, and the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack comprise a plurality of grid elements which are connected into a whole;
determining an acceleration load according to the mass of the finite element model of the bracket assembly and the test acceleration;
applying the acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack, and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied;
determining whether the strength of the finite element model of the bracket assembly meets the standard according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly;
and determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data.
2. The method of claim 1, wherein said obtaining a finite element model of the carrier assembly comprises:
acquiring a three-dimensional model of the bracket, a three-dimensional model of the longitudinal beam and a three-dimensional model of the battery pack;
acquiring material parameters of the bracket, the longitudinal beam and the battery pack;
setting a density of a three-dimensional model of the bracket according to the material parameters of the bracket; setting the density of the three-dimensional model of the longitudinal beam according to the material parameters of the longitudinal beam; setting the density of the three-dimensional model of the battery pack according to the material parameters of the battery pack;
the three-dimensional model of the bracket, the three-dimensional model of the longitudinal beam and the three-dimensional model of the battery pack after density adjustment are subjected to grid division, the three-dimensional model of the bracket, the three-dimensional model of the longitudinal beam and the three-dimensional model of the battery pack are divided into a plurality of grid units which are connected into a whole and meet a set size target, and a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack are obtained;
and forming a finite element model of the bracket assembly by using the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack.
3. The method of claim 2, wherein the step of meshing the density-adjusted three-dimensional model of the bracket, the three-dimensional model of the stringer, and the three-dimensional model of the battery pack, and the step of dividing the three-dimensional model of the bracket, the three-dimensional model of the stringer, and the three-dimensional model of the battery pack into a plurality of integrally connected mesh cells satisfying a predetermined dimensional objective, comprises the steps of:
if the bracket is a stamping bracket, modeling a three-dimensional model of the bracket by adopting a two-dimensional unit to obtain a two-dimensional finite element model of the bracket;
and if the bracket is a cast bracket, modeling the three-dimensional model of the bracket by adopting a three-dimensional unit to obtain a three-dimensional finite element model of the bracket, and converting the three-dimensional finite element model into a two-dimensional finite element model of the bracket by using finite element pretreatment software.
4. The method of any of claims 1 to 3, wherein said determining an acceleration load from a mass of a finite element model of the carriage assembly and a test acceleration comprises:
acquiring the test acceleration, wherein the test acceleration is measured by a three-phase acceleration sensor arranged on a bracket assembly of an actual vehicle;
and determining the acceleration load according to the test acceleration, the mass of the finite element model of the bracket, the mass of the finite element model of the longitudinal beam and the mass of the finite element model of the battery pack.
5. The method of claim 4, wherein prior to said determining an acceleration load based on said test acceleration, a mass of a finite element model of said carrier, a mass of a finite element model of said stringer, and a mass of a finite element model of said battery pack, said method further comprises:
carrying out constraint modal analysis on the finite element model of the bracket assembly to obtain a modal shape of the finite element model of the bracket assembly;
and if the difference value of the modal shape of the finite element model of the bracket assembly and the frequency of the preset modal shape is within a preset range, judging that the finite element model of the bracket assembly reaches the standard.
6. The method of any of claims 1-3, wherein prior to said applying the acceleration load to the connection of the finite element model of the bracket and the finite element model of the battery pack and determining the stress data, displacement data, and strain data of the finite element model of the bracket assembly after the acceleration load is applied, the method further comprises:
establishing contact pairs at all connecting positions among the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack by using pretreatment software;
using pre-processor software, constraining the degrees of freedom of the finite element model of the stringer in the transverse direction, the longitudinal direction and the vertical direction.
7. The method of any of claims 1 to 3, wherein determining whether the strength of the finite element model of the carrier assembly is met based on the stress data, the strain data, and the material parameters of the finite element model of the carrier assembly comprises:
determining a safety coefficient of the finite element model of the bracket assembly according to the stress data, the strain data, the material parameters of the finite element model of the bracket, the material parameters of the finite element model of the longitudinal beam and the material parameters of the finite element model of the battery pack, and judging that the strength of the finite element model of the bracket assembly reaches the standard if the safety coefficient is greater than a safety coefficient threshold value or the maximum value of the stress data is smaller than a tensile strength limit value of a material used at a position corresponding to the maximum value of the stress data;
determining whether the stiffness of the finite element model of the bracket assembly meets the standard according to the displacement data comprises:
and determining whether the displacement amounts of the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack in the preset direction are all smaller than corresponding displacement amount thresholds or not according to the displacement data, and if the displacement amounts of the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack in the preset direction are all smaller than the corresponding displacement amount thresholds, judging that the rigidity of the finite element model of the bracket assembly reaches the standard.
8. A vehicle battery carrier assembly performance testing apparatus, the apparatus comprising:
the model acquisition module is used for acquiring a finite element model of the bracket assembly, the finite element model of the bracket assembly comprises a finite element model of the bracket, a finite element model of the longitudinal beam and a finite element model of the battery pack, and the finite element model of the bracket, the finite element model of the longitudinal beam and the finite element model of the battery pack all comprise a plurality of grid units which are connected into a whole;
the load determining module is used for determining the acceleration load according to the mass of the finite element model of the bracket assembly and the test acceleration;
the data determination module is used for applying the acceleration load to the connection position of the finite element model of the bracket and the finite element model of the battery pack and determining stress data, displacement data and strain data of the finite element model of the bracket assembly after the acceleration load is applied;
the strength judging module is used for determining whether the strength of the finite element model of the bracket assembly reaches the standard or not according to the stress data, the strain data and the material parameters of the finite element model of the bracket assembly;
and the rigidity judging module is used for determining whether the rigidity of the finite element model of the bracket assembly reaches the standard or not according to the displacement data.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114626278A (en) * | 2022-05-16 | 2022-06-14 | 湖南大学 | Method for evaluating structural performance and monitoring health of power battery bracket |
| CN115057077A (en) * | 2022-05-07 | 2022-09-16 | 德邦物流股份有限公司 | Tray design method, system, equipment and computer readable storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115057077A (en) * | 2022-05-07 | 2022-09-16 | 德邦物流股份有限公司 | Tray design method, system, equipment and computer readable storage medium |
| CN114626278A (en) * | 2022-05-16 | 2022-06-14 | 湖南大学 | Method for evaluating structural performance and monitoring health of power battery bracket |
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