A vehicle support random vibration analysis method, device, medium and electronic equipment

Abstract

The application relates to the technical field of vehicle support test, and discloses a vehicle support random vibration analysis method, device, medium and electronic equipment.The method comprises the following steps: performing random vibration intensity analysis on a first finite element model meeting preset modal requirements, obtaining a second finite element model meeting preset intensity requirements and having a plurality of first regions, and identifying a first weak region according to the maximum stress of each first region; performing random vibration durability analysis on the second finite element model, obtaining a third finite element model meeting preset fatigue damage threshold requirements and having a plurality of second regions, and identifying a second weak region according to the maximum fatigue damage of each second region.Through the layer-by-layer progressive analysis of the random vibration intensity analysis and the random vibration durability analysis, the strength and durability of the vehicle support can be improved, a vehicle support with better quality is developed, and the effectiveness of the vehicle support random vibration analysis is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle bracket testing technology, and in particular, to a method, apparatus, medium, and electronic equipment for random vibration analysis of vehicle brackets. Background Technology

[0002] As a component of automobiles, the fatigue durability of automotive brackets is primarily verified through physical tests such as random vibration during the development process. Currently, automotive bracket analysis relies heavily on bench testing, but this physical vibration testing method is obviously costly. Existing technologies have also proposed some vibration analysis methods based on simulation testing, but existing simulation testing methods often lack standardized requirements for model parameters during testing, leading to inaccurate results and significant errors in the test results, which affects the accuracy of vehicle bracket vibration analysis. Summary of the Invention

[0003] This application provides a method, device, medium, and electronic equipment for random vibration analysis of vehicle brackets. It can perform random vibration intensity analysis on a first finite element model that meets preset modal requirements, and perform random vibration durability analysis on a second finite element model that meets preset strength requirements, thereby identifying a first weak region and a second weak region. The analysis results are based on meeting the requirements of various model parameters, which ensures the accuracy of the analysis results and improves the accuracy of the identified first and second weak regions.

[0004] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part by practice of this application.

[0005] According to one aspect of the embodiments of this application, a method for random vibration analysis of a vehicle bracket is provided, the method comprising:

[0006] Random vibration intensity analysis is performed on the first finite element model that meets the preset modal requirements to obtain a second finite element model that meets the preset strength requirements and has multiple first regions. The first weak region is identified based on the maximum stress value of each first region.

[0007] Random vibration durability analysis is performed on the second finite element model to obtain a third finite element model that meets the preset fatigue damage threshold requirement and has multiple second regions. The second weak region is identified based on the maximum fatigue damage value of each of the second regions.

[0008] In one embodiment of this application, based on the foregoing scheme, the first finite element model that meets the preset modal requirements is obtained in the following way:

[0009] Establish a first initial finite element model of the vehicle bracket and obtain the initial modal frequencies of the first initial finite element model;

[0010] If the initial modal frequency is greater than or equal to a preset frequency threshold, then the first initial finite element model is the first finite element model that satisfies the preset modal requirements;

[0011] If the initial modal frequency is lower than the preset frequency threshold, the vehicle bracket is structurally optimized to obtain an optimized first target finite element model, and the first target finite element model is used as the first finite element model.

[0012] In one embodiment of this application, based on the aforementioned scheme, the step of performing random vibration intensity analysis on a first finite element model that meets preset modal requirements to obtain a second finite element model that meets preset strength requirements and has multiple first regions includes:

[0013] The first finite element model that meets the preset modal requirements is constrained, and the forced load, frequency sweep range, dynamic load and preset power spectral density are used as excitation signal parameters.

[0014] Based on the excitation signal parameters, random vibration intensity analysis is performed on the first finite element model to obtain multiple second finite element models of the first region;

[0015] If the maximum stress value in each of the first regions is less than a preset stress threshold, then the second finite element model satisfies the preset strength requirement.

[0016] In one embodiment of this application, based on the foregoing scheme, the method further includes:

[0017] If the stress value of at least one of the first regions is greater than the preset stress threshold, the vehicle bracket is structurally optimized to obtain an optimized second target finite element model.

[0018] In this case, the stress values ​​of each first region of the second target finite element model are all less than the preset stress threshold.

[0019] In one embodiment of this application, based on the foregoing scheme, identifying the first weak region according to the maximum stress value of each of the first regions includes:

[0020] Select the maximum value from the respective maximum stress values ​​of each of the first regions;

[0021] The first region corresponding to the maximum value is designated as the first weak region.

[0022] In one embodiment of this application, based on the aforementioned scheme, the step of performing random vibration durability analysis on the second finite element model to obtain a third finite element model that meets a preset fatigue damage threshold and has multiple second regions includes:

[0023] Frequency response analysis of the second finite element model with a preset excitation signal is performed to obtain the modal participation factor and modal stress parameters of the second finite element model;

[0024] Based on the modal participation factor, the modal stress parameters, the preset power spectral density, and the preset material parameters, random vibration durability analysis is performed to obtain the third finite element model of multiple second regions;

[0025] If the maximum fatigue damage value of each of the second regions is lower than the preset fatigue damage threshold, then the third finite element model satisfies the preset fatigue damage threshold requirement.

[0026] In one embodiment of this application, based on the foregoing scheme, the method further includes:

[0027] If the maximum fatigue damage value of at least one of the second regions is greater than the preset fatigue damage threshold, then the vehicle bracket is structurally optimized to obtain an optimized third target finite element model.

[0028] In this context, the maximum fatigue damage value of each second region in the third target finite element model is less than the preset fatigue damage threshold.

[0029] According to one aspect of the embodiments of this application, a random vibration analysis device for a vehicle bracket is provided. The device includes: a first analysis unit, configured to perform random vibration intensity analysis on a first finite element model that meets preset modal requirements, obtain a second finite element model that meets preset strength requirements and has multiple first regions, and identify a first weak region based on the maximum stress value of each of the first regions; and a second analysis unit, configured to perform random vibration durability analysis on the second finite element model, obtain a third finite element model that meets preset fatigue damage threshold requirements and has multiple second regions, and identify a second weak region based on the maximum fatigue damage value of each of the second regions.

[0030] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided having a computer program stored thereon, the computer program including executable instructions that, when executed by a processor, implement the vehicle bracket random vibration analysis method as described in the above embodiments.

[0031] According to one aspect of the embodiments of this application, an electronic device is provided, comprising: one or more processors; and a memory for storing executable instructions of the processors, wherein when the executable instructions are executed by the one or more processors, the one or more processors implement the vehicle bracket random vibration analysis method as described in the above embodiments.

[0032] In the technical solution of this application embodiment, random vibration intensity analysis can be performed on a first finite element model that meets the preset modal requirements. Meeting the preset modal requirements is to ensure that the first finite element model can meet the requirement of not easily resonating. Random vibration intensity analysis based on this is more meaningful and practical.

[0033] Furthermore, a second finite element model with multiple first regions that meets preset strength requirements can be obtained through random vibration intensity analysis. The preset strength requirements are to ensure that the support structure corresponding to the first finite element model is not prone to cracking. Analysis based on this is more meaningful, and the final results are more representative and accurate. Therefore, the first weak region identified by the maximum stress value of each of the first regions is more accurate. This first weak region can be used to determine the strength optimization direction of the support structure corresponding to the second finite element model. Structural optimization can then be performed according to this strength optimization direction, resulting in a more stable and safer vehicle support.

[0034] Furthermore, by performing random vibration durability analysis on the second finite element model, a third finite element model with multiple second regions is obtained, which meets the preset fatigue damage threshold requirement. The preset fatigue damage threshold requirement ensures that the support structure corresponding to the third finite element model has a certain level of durability. Vibration analysis based on this threshold ensures that the final developed support meets certain durability requirements. Simultaneously, the second weak regions identified by the maximum fatigue damage values ​​of each second region determine the durability optimization direction for the support structure corresponding to the third finite element model. Structural optimization can be performed using this durability optimization direction, making the final developed vehicle support more durable and extending its service life.

[0035] In summary, through the progressive analysis of random vibration intensity and random vibration durability, a finite element model with certain strength and durability can be obtained through continuous experimentation and optimization, i.e., the vehicle bracket. At the same time, by identifying the first and second weak areas, corresponding strength and durability optimizations can be performed, further improving the strength and durability of the vehicle bracket. This leads to the development of a higher-quality vehicle bracket and enhances the effectiveness of random vibration analysis of the vehicle bracket.

[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0038] Figure 1 This is a flowchart illustrating a random vibration analysis method for a vehicle support according to an embodiment of this application;

[0039] Figure 2 This is a flowchart illustrating a random vibration durability analysis according to an embodiment of this application;

[0040] Figure 3 This is a block diagram of a random vibration analysis device for a vehicle bracket according to an embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the system structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0043] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0044] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller node devices.

[0045] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0046] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] The implementation details of the technical solutions in the embodiments of this application are described in detail below:

[0048] First, it should be noted that the random vibration analysis scheme for vehicle brackets proposed in this application can be applied to related technical fields of vehicle bracket testing. In the embodiments of this application, random vibration intensity analysis can be performed on a first finite element model that meets the preset modal requirements. Meeting the preset modal requirements is to ensure that the first finite element model is not prone to resonance. Random vibration intensity analysis based on this requirement is more meaningful and practical.

[0049] Furthermore, a second finite element model with multiple first regions that meets preset strength requirements can be obtained through random vibration intensity analysis. The preset strength requirements are to ensure that the support structure corresponding to the first finite element model is not prone to cracking. Analysis based on this is more meaningful, and the final results are more representative and accurate. Therefore, the first weak region identified by the maximum stress value of each of the first regions is more accurate. This first weak region can be used to determine the strength optimization direction of the support structure corresponding to the second finite element model. Structural optimization can then be performed according to this strength optimization direction, resulting in a more stable and safer vehicle support.

[0050] Furthermore, by performing random vibration durability analysis on the second finite element model, a third finite element model with multiple second regions is obtained, which meets the preset fatigue damage threshold requirement. The preset fatigue damage threshold requirement ensures that the support structure corresponding to the third finite element model has a certain level of durability. Vibration analysis based on this threshold ensures that the final developed support meets certain durability requirements. Simultaneously, the second weak regions identified by the maximum fatigue damage values ​​of each second region determine the durability optimization direction for the support structure corresponding to the third finite element model. Structural optimization can be performed using this durability optimization direction, making the final developed vehicle support more durable and extending its service life.

[0051] In summary, through the progressive analysis of random vibration intensity and random vibration durability, a finite element model with certain strength and durability can be obtained through continuous experimentation and optimization, i.e., the vehicle bracket. At the same time, by identifying the first and second weak areas, corresponding strength and durability optimizations can be performed, further improving the strength and durability of the vehicle bracket. This leads to the development of a higher-quality vehicle bracket and enhances the effectiveness of random vibration analysis of the vehicle bracket.

[0052] According to one aspect of this application, a method for random vibration analysis of a vehicle bracket is provided. Figure 1 This is a flowchart illustrating a random vibration analysis method for a vehicle support according to an embodiment of this application. The vehicle control method includes at least steps 110 to 120, detailed below:

[0053] In step 110, random vibration intensity analysis is performed on the first finite element model that meets the preset modal requirements to obtain a second finite element model that meets the preset strength requirements and has multiple first regions, and the first weak region is identified according to the maximum stress value of each of the first regions.

[0054] Specifically, the first finite element model, the second finite element model, and the third finite element model in this embodiment are all based on the structure of the vehicle bracket. The preset modal requirement can be that the first modal frequency of the first finite element model is greater than a preset frequency threshold, which can be 30 Hz. If the first modal frequency of the first finite element model is lower than the preset frequency threshold, the vehicle bracket corresponding to the first finite element model is prone to resonance. At this time, it is not suitable to perform subsequent random vibration intensity analysis. Therefore, random vibration intensity analysis can only be performed on the first finite element model that meets the preset modal requirement.

[0055] In one embodiment of this application, the first finite element model that meets the preset modal requirements is obtained in the following way:

[0056] Establish a first initial finite element model of the vehicle bracket and obtain the initial modal frequencies of the first initial finite element model;

[0057] If the initial modal frequency is greater than or equal to a preset frequency threshold, then the first initial finite element model is the first finite element model that satisfies the preset modal requirements;

[0058] If the initial modal frequency is lower than the preset frequency threshold, the vehicle bracket is structurally optimized to obtain an optimized first target finite element model, and the first target finite element model is used as the first finite element model.

[0059] Specifically, by establishing a first initial finite element model of the vehicle bracket and obtaining the initial modal frequency of the first initial finite element model, if the initial modal frequency is greater than or equal to a preset frequency threshold, it means that the first finite element model established at this time meets the preset modal requirements, and the first initial finite element model is used as the first finite element model that meets the preset modal requirements. If the initial modal frequency is lower than the preset frequency threshold, then the vehicle bracket needs to be structurally optimized, and a new first target finite element model needs to be established for the optimized vehicle bracket.

[0060] Furthermore, the first target finite element model is obtained through structural optimization using the following method: First, modal constraints are applied to the initial finite element model to obtain modal participation factors in six degrees of freedom directions. The sum of the proportions of the modal participation factors in each degree of freedom direction is 1. The six degrees of freedom directions are X translation, Y translation, Z translation, X rotation, Y rotation, and Z rotation. The constrained modes are solved using finite element software to obtain the values ​​of the modal participation factors in the six degrees of freedom. The larger the modal participation factor value, the easier it is to be excited in that direction. Combined with the mode shapes, the directions that need structural optimization are identified. Then, the vehicle bracket corresponding to the initial finite element model is structurally optimized to obtain the corresponding first target finite element model. Finally, a first finite element model that meets the preset modal requirements is obtained.

[0061] Specifically, for example, if the initial modal frequency of the first initial finite element model is 18 Hz, it does not meet the preset modal requirements. Therefore, structural optimization of the vehicle bracket corresponding to the first initial finite element model is required. This can be achieved by solving the constraint modes to obtain the six modal participation factors of the first initial finite element model in the six degrees of freedom directions. The modal factor percentages (values) in the X translation, Y translation, Z translation, X rotation, Y rotation, and Z rotation directions are 18%, 11%, 23%, 14%, 7%, and 27%, respectively. The obtained 27% is the maximum percentage of the modal participation factor, i.e., the maximum value. This corresponds to the Z rotation direction, indicating that structural optimization is needed in the Z rotation direction. This can be achieved by adding fastening plates to the vehicle bracket to change its structure and increase the initial modal frequency of the finite element model corresponding to the vehicle bracket.

[0062] In one embodiment of this application, the step of performing random vibration intensity analysis on a first finite element model that meets preset modal requirements to obtain a second finite element model that meets preset strength requirements and has multiple first regions includes:

[0063] The first finite element model that meets the preset modal requirements is constrained, and the forced load, frequency sweep range, dynamic load and preset power spectral density are used as excitation signal parameters.

[0064] Based on the excitation signal parameters, random vibration intensity analysis is performed on the first finite element model to obtain multiple second finite element models of the first region;

[0065] If the maximum stress value in each of the first regions is less than a preset stress threshold, then the second finite element model satisfies the preset strength requirement.

[0066] Specifically, the first finite element model that meets the preset modal requirements is constrained, and the forced load, frequency sweep range, dynamic load and preset power spectral density are used as excitation signal parameters and input into the finite element strength analysis software to obtain the corresponding stress, that is, the stress value of each first region can be obtained.

[0067] Since the first region can be further divided into many smaller regions, it also has multiple stress values. In this embodiment, the first weak region is identified by finding the maximum stress value of each first region. The preset stress threshold can be set according to actual needs, and the preset stress threshold corresponds to the material's yield strength. When a preset excitation is applied, if the stress value is greater than the material's yield strength, the bracket will crack. In this embodiment, it can be specifically 120 MPa. When the maximum stress value of each first region is less than the preset stress threshold, i.e., 120 MPa, it indicates that the vehicle bracket will not be at risk of cracking during the vehicle's lifespan.

[0068] In one embodiment, the method further includes:

[0069] If the stress value of at least one of the first regions is greater than the preset stress threshold, the vehicle bracket is structurally optimized to obtain an optimized second target finite element model.

[0070] In this case, the stress values ​​of each first region of the second target finite element model are all less than the preset stress threshold.

[0071] Specifically, if the stress value of at least one of the first regions is greater than the preset stress threshold, it indicates that the vehicle bracket is at risk of cracking during the vehicle's life cycle. In this case, the vehicle bracket needs to be structurally optimized. This can be achieved by changing the internal structure to reduce the stress generated by the structure, thereby optimizing the structure until each stress value of the finite element model corresponding to the optimized vehicle bracket is less than the preset stress threshold.

[0072] In one embodiment of this application, identifying the first weak region based on the maximum stress value of each of the first regions includes:

[0073] Select the maximum value from the respective maximum stress values ​​of each of the first regions;

[0074] The first region corresponding to the maximum value is designated as the first weak region.

[0075] Specifically, the first region can be defined as each region obtained when establishing the finite element model. Each first region has multiple stress values. By finding the maximum stress value of each first region and selecting the maximum value, the first region corresponding to the maximum value is the first weak region. This means that the structure of the first weak region can be optimized so that the stress values ​​corresponding to each first region in the second finite element model tend to be balanced, which is more suitable for use in the development of the whole vehicle.

[0076] In step 120, random vibration durability analysis is performed on the second finite element model to obtain a third finite element model that meets the preset fatigue damage threshold requirement and has multiple second regions. The second weak region is identified based on the maximum fatigue damage value of each of the second regions.

[0077] In one embodiment of this application, the step of performing random vibration durability analysis on the second finite element model to obtain a third finite element model that meets a preset fatigue damage threshold and has multiple second regions includes:

[0078] Frequency response analysis of the second finite element model with a preset excitation signal is performed to obtain the modal participation factor and modal stress parameters of the second finite element model;

[0079] Based on the modal participation factor, the modal stress parameters, the preset power spectral density, and the preset material parameters, random vibration durability analysis is performed to obtain the third finite element model of multiple second regions;

[0080] If the maximum fatigue damage value of each of the second regions is lower than the preset fatigue damage threshold, then the third finite element model satisfies the preset fatigue damage threshold requirement.

[0081] Specifically, the above has ensured that the obtained second finite element model meets the preset modal requirements and preset strength requirements. At this point, random vibration durability analysis can be further performed on the second finite element model to test and obtain a higher quality vehicle bracket.

[0082] See Figure 2 , Figure 2 The flowchart for random vibration durability analysis illustrates the structure of the vehicle bracket corresponding to the geometric model. Frequency response analysis of the second finite element model using a preset excitation signal is performed. The preset excitation signal can be a unit excitation signal in any of the X, Y, or Z directions. The corresponding modal participation factor and modal stress are obtained through frequency response analysis. These modal participation factors and modal stresses are then combined with the material's SN curve and the preset power spectral density (PSD), which can be selected according to actual needs. The maximum fatigue damage value is calculated using the miner method. Furthermore, the preset fatigue damage threshold can be specifically set to 1. The maximum fatigue damage value in the second region should be less than 1 to meet the preset fatigue damage threshold requirement.

[0083] In one embodiment of this application, the method further includes:

[0084] If the maximum fatigue damage value of at least one of the second regions is greater than the preset fatigue damage threshold, then the vehicle bracket is structurally optimized to obtain an optimized third target finite element model.

[0085] In this context, the maximum fatigue damage value of each second region in the third target finite element model is less than the preset fatigue damage threshold.

[0086] Specifically, if the maximum fatigue damage value of at least one of the second regions is greater than the preset fatigue damage threshold, it indicates that the vehicle bracket has a durability problem. In this case, the vehicle bracket needs to be structurally optimized. After optimization, the above step 110 is repeated to perform random vibration intensity analysis again. The finite element model that meets the preset strength requirements is then subjected to random vibration durability analysis. The analysis is continued (if it does not meet the requirements, optimization is continued) until the maximum fatigue damage value of each finite element model corresponding to the optimized vehicle bracket is less than the preset stress threshold 1.

[0087] The second region can be specifically defined as each region obtained during the establishment of the finite element model. Each second region has multiple fatigue damage values. By finding the maximum fatigue damage value for each first region and selecting the maximum value, the second region corresponding to the maximum value is the second weak region. This indicates that structural optimization can be performed on this second weak region to make the fatigue damage values ​​corresponding to each second region in the third finite element model tend to be balanced. The second weak region can identify the weak areas in the durability of the current vehicle bracket that need to be optimized, which is applicable to vehicle component development and improves the efficiency of vehicle development.

[0088] Finally, by applying strain gauges to the identified first and second weak areas, the safety of the experiment was improved, and final verification was conducted. Furthermore, qualitative analysis and simulation optimization before the experiment reduced the number of repeated bench tests, shortening the development cycle and cost; simultaneously, simulation experiments were used to identify corresponding weak areas, and strain gauges were applied to these weak areas to conduct the experiment.

[0089] In summary, through the progressive analysis of random vibration intensity and random vibration durability, a finite element model with certain strength and durability can be obtained through continuous experimentation and optimization, i.e., the vehicle bracket. At the same time, by identifying the first and second weak areas, corresponding strength and durability optimizations can be performed, further improving the strength and durability of the vehicle bracket. This leads to the development of a higher-quality vehicle bracket and enhances the effectiveness of random vibration analysis of the vehicle bracket.

[0090] Figure 3This is a block diagram of a random vibration analysis device 300 for a vehicle bracket according to an embodiment of this application. The random vibration analysis device 300 for a vehicle bracket according to an embodiment of this application includes: a first analysis unit 301 and a second analysis unit 302.

[0091] The first analysis unit 301 is used to perform random vibration intensity analysis on the first finite element model that meets the preset modal requirements, obtain a second finite element model that meets the preset strength requirements and has multiple first regions, and identify the first weak region based on the maximum stress value of each of the first regions.

[0092] The second analysis unit 302 is used to perform random vibration durability analysis on the second finite element model to obtain a third finite element model that meets the preset fatigue damage threshold requirements and has multiple second regions, and to identify the second weak region based on the maximum fatigue damage value of each of the second regions.

[0093] In another aspect, this application also provides a computer-readable storage medium storing a program product capable of implementing the methods provided above in this specification. In some possible implementations, various aspects of this application may also be implemented as a program product comprising program code that, when run on a terminal device, causes the terminal device to perform the steps described in the "Embodiment Methods" section of this specification according to various exemplary embodiments of this application.

[0094] The program product for implementing the above-described method according to the embodiments of this application may employ a portable compact disc read-only memory (CD-ROM) and include program code, and may run on a terminal device, such as a personal computer or mobile phone. However, the program product of this application is not limited thereto. In this document, the readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0095] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0096] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0097] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0098] Program code for performing the operations of this application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0099] In another respect, this application also provides an electronic device capable of implementing the above-described method.

[0100] Those skilled in the art will understand that various aspects of this application can be implemented as a system, method, or program product. Therefore, various aspects of this application can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, collectively referred to herein as a "circuit," "module," or "system."

[0101] The following reference Figure 4 To describe an electronic device 400 according to this embodiment of the present application. Figure 4 The electronic device 400 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0102] like Figure 4As shown, the electronic device 400 is manifested in the form of a general-purpose computing device. The components of the electronic device 400 may include, but are not limited to: at least one processing unit 410, at least one storage unit 420, and a bus 430 connecting different system components (including storage unit 420 and processing unit 410).

[0103] The storage unit stores program code that can be executed by the processing unit 410, causing the processing unit 410 to perform the steps described in the "Embodiment Methods" section above according to various exemplary embodiments of this application.

[0104] Storage unit 420 may include a readable medium in the form of a volatile storage unit, such as random access memory (RAM) 421 and / or cache memory 422, and may further include a read-only memory (ROM) 423.

[0105] Storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0106] Bus 430 can represent one or more of several types of bus structures, including a memory cell bus or memory cell control node, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0107] Electronic device 400 can also communicate with one or more external devices 1200 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 400, and / or with any device that enables electronic device 400 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 450. Furthermore, electronic device 400 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 460. As shown, network adapter 460 communicates with other modules of electronic device 400 via bus 430. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0108] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the method according to the embodiments of this application.

[0109] Furthermore, the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0110] It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for analyzing random vibrations of a vehicle support frame, characterized in that, The method includes: Random vibration intensity analysis is performed on the first finite element model that meets the preset modal requirements to obtain a second finite element model that meets the preset strength requirements and has multiple first regions. The first weak region is identified according to the maximum stress value of each first region. If the maximum stress value of each first region is less than the preset stress threshold, the second finite element model meets the preset strength requirements. Random vibration durability analysis is performed on the second finite element model to obtain a third finite element model with multiple second regions that meets the preset fatigue damage threshold requirement. The second weak region is identified based on the maximum fatigue damage value of each second region. If the maximum fatigue damage value of each second region is lower than the preset fatigue damage threshold, then the third finite element model meets the preset fatigue damage threshold requirement.

2. The method according to claim 1, characterized in that, The first finite element model that meets the preset modal requirements is obtained through the following method: Establish a first initial finite element model of the vehicle bracket and obtain the initial modal frequencies of the first initial finite element model; If the initial modal frequency is greater than or equal to a preset frequency threshold, then the first initial finite element model is the first finite element model that satisfies the preset modal requirements; If the initial modal frequency is lower than the preset frequency threshold, the vehicle bracket is structurally optimized to obtain an optimized first target finite element model, and the first target finite element model is used as the first finite element model.

3. The method according to claim 2, characterized in that, The random vibration intensity analysis is performed on the first finite element model that meets the preset modal requirements to obtain a second finite element model that meets the preset intensity requirements and has multiple first regions, including: The first finite element model that meets the preset modal requirements is constrained, and the forced load, frequency sweep range, dynamic load and preset power spectral density are used as excitation signal parameters. Based on the excitation signal parameters, a random vibration intensity analysis is performed on the first finite element model to obtain a second finite element model with multiple first regions.

4. The method according to claim 3, characterized in that, The method further includes: If the stress value of at least one of the first regions is greater than the preset stress threshold, the vehicle bracket is structurally optimized to obtain an optimized second target finite element model. In this case, the stress values ​​of each first region of the second target finite element model are all less than the preset stress threshold.

5. The method according to claim 3, characterized in that, The step of identifying the first weak region based on the maximum stress value of each of the first regions includes: Select the maximum value from the respective maximum stress values ​​of each of the first regions; The first region corresponding to the maximum value is designated as the first weak region.

6. The method according to claim 3, characterized in that, The random vibration durability analysis of the second finite element model yields a third finite element model that meets the preset fatigue damage threshold and has multiple second regions, including: Frequency response analysis of the second finite element model with a preset excitation signal is performed to obtain the modal participation factor and modal stress parameters of the second finite element model; Based on the modal participation factor, the modal stress parameters, the preset power spectral density, and the preset material parameters, random vibration durability analysis is performed to obtain the third finite element model of multiple second regions.

7. The method according to claim 6, characterized in that, The method further includes: If the maximum fatigue damage value of at least one of the second regions is greater than the preset fatigue damage threshold, then the vehicle bracket is structurally optimized to obtain an optimized third target finite element model. In this context, the maximum fatigue damage value of each second region in the third target finite element model is less than the preset fatigue damage threshold.

8. A random vibration analysis device for a vehicle bracket, characterized in that, The device includes: The first analysis unit is used to perform random vibration intensity analysis on the first finite element model that meets the preset modal requirements, obtain a second finite element model that meets the preset strength requirements and has multiple first regions, and identify the first weak region according to the stress maximum value of each first region. If the stress maximum value of each first region is less than the preset stress threshold, then the second finite element model meets the preset strength requirements. The second analysis unit is used to perform random vibration durability analysis on the second finite element model to obtain a third finite element model with multiple second regions that meets the preset fatigue damage threshold requirement. The third finite element model is used to identify second weak regions based on the maximum fatigue damage value of each second region. If the maximum fatigue damage value of each second region is lower than the preset fatigue damage threshold, then the third finite element model meets the preset fatigue damage threshold requirement.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one piece of program code, which is loaded and executed by a processor to perform the operations performed by the method as described in any one of claims 1 to 7.

10. An electronic device, characterized in that, The electronic device includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to perform the operation performed by the method as described in any one of claims 1 to 7.

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