Boarding pedal durability analysis method and device, computer equipment and storage medium

Abstract

The application relates to a boarding pedal durability analysis method and device, computer equipment and a storage medium. The method comprises the following steps: performing vibration working condition load spectrum testing on a boarding pedal fixing structure in a first test period, and obtaining a first displacement signal of the boarding pedal fixing structure; constructing a multi-body dynamics model corresponding to the boarding pedal fixing structure according to the first displacement signal, and obtaining a second displacement signal of a fixing point; constructing a first finite element model of the boarding pedal structure, and obtaining vibration working condition structure damage according to the second displacement signal and the first finite element model; configuring a pedaling force applying position and a pedaling force of the boarding pedal structure in the first finite element model, and obtaining pedaling working condition structure damage according to the pedaling force applying position and the pedaling force in a second test period; and obtaining a durability analysis result of the boarding pedal structure according to the vibration working condition structure damage and the pedaling working condition structure damage. The method can improve the durability analysis precision of the automobile boarding pedal.

Description

Technical Field

[0001] This application relates to the field of simulation analysis technology, and in particular to a method, apparatus, computer equipment, storage medium, and computer program product for improving the durability of vehicle pedals. Background Technology

[0002] Durability, representing a product's lifespan, is crucial for automotive structures. The entry pedal, in addition to bearing the loads from the driver getting in and out of the vehicle, also withstands vibration loads transmitted from the road surface during vehicle movement, making its durability lifespan control complex and difficult. Traditional methods for controlling the durability of entry pedals primarily involve road or bench testing, requiring prototypes and vehicles, which is time-consuming and leads to delayed problem detection. Therefore, in recent years, with technological advancements, CAE simulation technology has begun to be used to control the strength and durability of automotive structures. This allows for the identification of structural problems in the early to mid-stages of product development, enabling significant improvements in durability lifespan through structural modifications, thereby reducing development costs and shortening the development cycle.

[0003] Currently, industry-standard durability simulation analysis of vehicle treadmills primarily relies on frequency domain simulations based on power spectral density (PSD) as input. Since the input is often single-axis loading, it fails to account for coupling phenomena based on true 6-DOF drive inputs, resulting in low accuracy in calculating lifespan. Furthermore, over its entire lifespan, the total structural damage to the treadmill consists of damage from repeated foot traffic during driver entry and exit, and accumulated damage from vibrations under various driving conditions. However, current durability simulation analyses for treadmills do not simultaneously consider both foot traffic and driving vibration conditions, further contributing to low simulation accuracy. This leads to fatigue cracking issues in the treadmill structure during product development verification or user deployment.

[0004] Current durability analyses of vehicle step pedals generally suffer from low accuracy in the calculation results. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for analyzing the durability of vehicle treads, which can improve the accuracy of durability analysis of vehicle treads, in response to the above-mentioned technical problems.

[0006] Firstly, this application provides a method for analyzing the durability of a vehicle's foot pedal. The method includes:

[0007] In the first test cycle, the vibration load spectrum test of the upper pedal fixing structure is carried out. Acceleration signals are collected by at least one acceleration sensor installed on the upper pedal fixing structure, and the first displacement signal of the upper pedal fixing structure is obtained based on the acceleration signals. The upper pedal fixing structure is equipped with fixing points of the upper pedal structure.

[0008] A multibody dynamics model corresponding to the fixed structure of the upper pedal is constructed based on the first displacement signal, and the second displacement signal of the fixed point is obtained based on the multibody dynamics model.

[0009] A first finite element model of the boarding pedal structure is constructed, and the vibration condition structural damage of the boarding pedal structure is obtained based on the second displacement signal and the first finite element model.

[0010] In the first finite element model, the pedal structure is configured with the corresponding pedal force application position, and the pedal force corresponding to the pedal force application position is determined. In the second test cycle, the pedal force application position and the pedal force are used to obtain the pedal force application condition structural damage corresponding to the pedal force application position.

[0011] Based on the structural damage under vibration conditions and the structural damage under stepping conditions corresponding to the location where the stepping force is applied, the durability analysis results of the vehicle pedal structure are obtained.

[0012] In one embodiment, at least one acceleration sensor includes four tri-directional acceleration sensors mounted at different locations, each tri-directional acceleration sensor being used to acquire a set of acceleration signals, and to acquire a first displacement signal of the upper vehicle pedal fixing structure based on the acceleration signals, including:

[0013] From the four sets of acceleration signals, the X-axis, Y-axis and Z-axis signals of the first set of acceleration signals are obtained, the Z-axis signal of the second set of acceleration signals is obtained, the Z-axis signal of the third set of acceleration signals is obtained, and the Y-axis and Z-axis signals of the fourth set of acceleration signals are obtained, resulting in seven channel signals.

[0014] The first displacement signal of the fixed structure of the upper pedal is obtained based on the seven channel signals.

[0015] In one embodiment, the first displacement signal of the mounting plate fixing structure is obtained based on seven channel signals, including:

[0016] The seven channel signals are subjected to the first Butterworth high-pass filter and the first signal integration to obtain the velocity signal;

[0017] The velocity signal is subjected to a second Butterworth high-pass filter and a second signal integration to obtain the initial displacement signal;

[0018] The initial displacement signal is subjected to a third Butterworth high-pass filter to obtain the first displacement signal.

[0019] In one embodiment, a multibody dynamics model corresponding to the fixed structure of the upper vehicle pedal is constructed based on the first displacement signal, including:

[0020] Construct a second finite element model of the fixed structure of the vehicle's upper pedal;

[0021] The drive signal is obtained based on the first displacement signal and the seven channel signals;

[0022] An initial multibody dynamics model is constructed based on the driving signal and the second finite element model. In the initial multibody dynamics model, the second finite element model is made flexible to obtain the multibody dynamics model corresponding to the fixed structure of the upper pedal.

[0023] In one embodiment, the drive signal is obtained based on the first displacement signal and seven channel signals, including:

[0024] Based on the installation position of each three-directional acceleration sensor, at least one first local coordinate system based on the fixed structure of the vehicle's foot pedal and at least one second local coordinate system based on the ground are constructed.

[0025] Based on the first local coordinate system, the second local coordinate system, and the seven channel signals, establish multi-degree-of-freedom drive data for the fixed structure of the vehicle's pedal and the corresponding ground.

[0026] The driving signal is obtained based on the multi-degree-of-freedom driving data and the first displacement signal.

[0027] In one embodiment, the vibration condition structural damage of the upper vehicle pedal structure is obtained based on the second displacement signal and the first finite element model, including:

[0028] Based on the second displacement signal and the second multibody dynamics model, the modal participation factor of the upper vehicle pedal structure is obtained;

[0029] Determine the material types of each component of the vehicle's foot pedal structure;

[0030] Based on the modal participation factor and the material types of each component of the upper pedal structure, the structural damage under vibration conditions of the upper pedal structure is calculated.

[0031] In one embodiment, based on the structural damage under vibration conditions and the structural damage under pedaling conditions corresponding to the location where the pedaling force is applied, the durability analysis results of the vehicle pedal structure are obtained, including:

[0032] The first cycle number is determined based on the first test cycle, and the total damage under the vibration condition is obtained based on the first cycle number and the structural damage under the vibration condition.

[0033] The second test cycle number is determined based on the second test cycle. Based on the second test cycle number and the structural damage of the stepping condition corresponding to the stepping force application position, the sub-damage of the stepping condition corresponding to the stepping force application position is obtained.

[0034] The total damage of the trampling condition is obtained based on the number of locations where trampling force is applied and the sub-damage of each trampling condition corresponding to the location where trampling force is applied.

[0035] Based on the total damage under vibration and the total damage under trampling conditions, a comprehensive damage result is obtained, which serves as the durability analysis result of the vehicle pedal structure.

[0036] In one embodiment, the method further includes:

[0037] If the durability analysis results do not meet the preset conditions, adjust the upper pedal structure, return to the step of performing vibration load spectrum test on the upper pedal fixed structure in the first test cycle, and continue execution.

[0038] Secondly, this application also provides a device for analyzing the durability of a vehicle's foot pedal. The device includes:

[0039] The signal acquisition module is used to perform vibration load spectrum testing on the upper vehicle pedal fixing structure in the first test cycle. It acquires acceleration signals through at least one acceleration sensor installed on the upper vehicle pedal fixing structure and obtains the first displacement signal of the upper vehicle pedal fixing structure based on the acceleration signals. The upper vehicle pedal fixing structure is equipped with fixing points for the upper vehicle pedal structure.

[0040] The signal conversion module is used to construct a multibody dynamics model corresponding to the fixed structure of the upper pedal based on the first displacement signal, and to obtain the second displacement signal of the fixed point based on the multibody dynamics model.

[0041] The first analysis module is used to construct the first finite element model of the upper vehicle pedal structure and obtain the vibration condition structural damage of the upper vehicle pedal structure based on the second displacement signal and the first finite element model.

[0042] The second analysis module is used to configure the pedal application position corresponding to the pedal structure in the first finite element model, determine the pedal force corresponding to the pedal application position, and obtain the structural damage of the pedal application position in the second test cycle based on the pedal application position and the pedal force.

[0043] The analysis and calculation module is used to obtain the durability analysis results of the vehicle pedal structure based on the structural damage under vibration conditions and the structural damage under stepping conditions corresponding to the location where the stepping force is applied.

[0044] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0045] In the first test cycle, the vibration load spectrum test of the upper pedal fixing structure is carried out. Acceleration signals are collected by at least one acceleration sensor installed on the upper pedal fixing structure, and the first displacement signal of the upper pedal fixing structure is obtained based on the acceleration signals. The upper pedal fixing structure is equipped with fixing points of the upper pedal structure.

[0046] A multibody dynamics model corresponding to the fixed structure of the upper pedal is constructed based on the first displacement signal, and the second displacement signal of the fixed point is obtained based on the multibody dynamics model.

[0047] A first finite element model of the boarding pedal structure is constructed, and the vibration condition structural damage of the boarding pedal structure is obtained based on the second displacement signal and the first finite element model.

[0048] In the first finite element model, the pedal structure is configured with the corresponding pedal force application position, and the pedal force corresponding to the pedal force application position is determined. In the second test cycle, the pedal force application position and the pedal force are used to obtain the pedal force application condition structural damage corresponding to the pedal force application position.

[0049] Based on the structural damage under vibration conditions and the structural damage under stepping conditions corresponding to the location where the stepping force is applied, the durability analysis results of the vehicle pedal structure are obtained.

[0050] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0051] In the first test cycle, the vibration load spectrum test of the upper pedal fixing structure is carried out. Acceleration signals are collected by at least one acceleration sensor installed on the upper pedal fixing structure, and the first displacement signal of the upper pedal fixing structure is obtained based on the acceleration signals. The upper pedal fixing structure is equipped with fixing points of the upper pedal structure.

[0052] A multibody dynamics model corresponding to the fixed structure of the upper pedal is constructed based on the first displacement signal, and the second displacement signal of the fixed point is obtained based on the multibody dynamics model.

[0053] A first finite element model of the boarding pedal structure is constructed, and the vibration condition structural damage of the boarding pedal structure is obtained based on the second displacement signal and the first finite element model.

[0054] In the first finite element model, the pedal structure is configured with the corresponding pedal force application position, and the pedal force corresponding to the pedal force application position is determined. In the second test cycle, the pedal force application position and the pedal force are used to obtain the pedal force application condition structural damage corresponding to the pedal force application position.

[0055] Based on the structural damage under vibration conditions and the structural damage under stepping conditions corresponding to the location where the stepping force is applied, the durability analysis results of the vehicle pedal structure are obtained.

[0056] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0057] In the first test cycle, the vibration load spectrum test of the upper pedal fixing structure is carried out. Acceleration signals are collected by at least one acceleration sensor installed on the upper pedal fixing structure, and the first displacement signal of the upper pedal fixing structure is obtained based on the acceleration signals. The upper pedal fixing structure is equipped with fixing points of the upper pedal structure.

[0058] A multibody dynamics model corresponding to the fixed structure of the upper pedal is constructed based on the first displacement signal, and the second displacement signal of the fixed point is obtained based on the multibody dynamics model.

[0059] A first finite element model of the boarding pedal structure is constructed, and the vibration condition structural damage of the boarding pedal structure is obtained based on the second displacement signal and the first finite element model.

[0060] In the first finite element model, the pedal structure is configured with the corresponding pedal force application position, and the pedal force corresponding to the pedal force application position is determined. In the second test cycle, the pedal force application position and the pedal force are used to obtain the pedal force application condition structural damage corresponding to the pedal force application position.

[0061] Based on the structural damage under vibration conditions and the structural damage under stepping conditions corresponding to the location where the stepping force is applied, the durability analysis results of the vehicle pedal structure are obtained.

[0062] The aforementioned method, apparatus, computer equipment, storage medium, and computer program product for analyzing the durability of the vehicle treadmill pedal perform vibration load spectrum testing on the fixed structure of the vehicle treadmill pedal in the first test cycle. Acceleration signals are collected using at least one accelerometer installed on the fixed structure, and a first displacement signal of the fixed structure is obtained based on the acceleration signals. The fixed structure has fixed points. A multibody dynamics model corresponding to the fixed structure is constructed based on the first displacement signal, and a second displacement signal of the fixed points is obtained based on the multibody dynamics model. A first finite element model of the vehicle treadmill pedal structure is constructed, and vibration damage is obtained based on the second displacement signal and the first finite element model. The application position of the stepping force corresponding to the vehicle treadmill pedal structure is configured in the first finite element model, and the stepping force corresponding to the application position is determined. In the second test cycle, the stepping damage corresponding to the application position is obtained based on the application position and the stepping force. The durability analysis results of the vehicle treadmill pedal structure are obtained based on the vibration damage and the stepping damage corresponding to the application position. It can improve the accuracy of durability analysis of car step pedals. Attached Figure Description

[0063] Figure 1 This is a flowchart illustrating a method for analyzing the durability of the vehicle's foot pedal in one embodiment.

[0064] Figure 2 This is a logic flowchart of a method for analyzing the durability of the vehicle's foot pedal in one embodiment;

[0065] Figure 3 This is a schematic diagram of the mounting plate fixing structure in one embodiment;

[0066] Figure 4 This is a schematic diagram of the acceleration signal to displacement signal conversion process in one embodiment;

[0067] Figure 5 A flowchart illustrating the modeling process of the fixed structure for the boarding foot pedal in one embodiment;

[0068] Figure 6 This is a schematic diagram illustrating the drive breakdown of the boarding foot pedal structure in one embodiment;

[0069] Figure 7 This is a flowchart illustrating the process of calculating structural damage under vibration or trampling conditions in one embodiment.

[0070] Figure 8 This is a schematic diagram of the boarding step structure in one embodiment;

[0071] Figure 9 This is a structural block diagram of a vehicle tread plate durability analysis device in one embodiment;

[0072] Figure 10 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0074] In one embodiment, such as Figure 1 As shown, a method for analyzing the durability of a vehicle's foot pedal is provided. This embodiment illustrates the method by applying it to a computer device. It is understood that the computer device can specifically be a terminal or a server. The terminal can be, but is not limited to, various personal computers, laptops, smartphones, tablets, IoT devices, and portable wearable devices. IoT devices can be smart speakers, smart TVs, smart air conditioners, smart medical devices, etc. Portable wearable devices can be smartwatches, smart bracelets, head-mounted devices, etc. The server can be a standalone server or a server cluster consisting of multiple servers. In this embodiment, the method includes the following steps:

[0075] Step 102: In the first test cycle, a vibration load spectrum test is performed on the upper pedal fixing structure. Acceleration signals are collected by at least one acceleration sensor installed on the upper pedal fixing structure, and the first displacement signal of the upper pedal fixing structure is obtained based on the acceleration signals. The upper pedal fixing structure is equipped with fixing points for the upper pedal structure.

[0076] The first test cycle refers to the duration or distance the vehicle travels on the test track. The test track refers to a designated section of road where the vehicle equipped with the test pedal travels. The test track can be a specific endurance test surface at a proving ground, a road surface frequently traveled by a particular user or vehicle model, or a special road surface with specific characteristics, such as sandy or concrete surfaces. The test pedal fixing structure refers to the structure of the system to which the test pedal fixing end belongs, that is, the structure in the vehicle body used to install and fix the test pedal, which can be, but is not limited to, the frame or body.

[0077] Optionally, the three-directional acceleration test response signals of the upper pedal fixing structure at multiple points under vibration conditions are obtained. The test environment is a road surface specified for reliability and durability verification. Preprocessing steps such as deburring, trend removal, and removal of undamaged road sections are performed on the test response signals within one cycle to obtain preliminary analysis signals. Channels are filtered to obtain the longitudinal (X), lateral (Y), and vertical (Z) acceleration signals of the upper pedal fixing structure at multiple key locations. Displacement signals at these key locations are obtained through three Butterworth high-pass filters and two integrations.

[0078] Step 104: Construct a multibody dynamics model corresponding to the fixed structure of the upper pedal based on the first displacement signal, and obtain the second displacement signal of the fixed point based on the multibody dynamics model.

[0079] Optionally, a finite element model of the upper pedal fixing structure is established. This model can generally be partially cut according to the layout, retaining key crossbeams, longitudinal beams, and structures with high stiffness. In a multibody dynamics simulation environment, a dynamic model of the upper pedal fixing structure is established. An actuation mechanism is created based on the displacement driving position, and CB modal analysis is used to make the upper pedal fixing structure more flexible. The acquired displacement signal is input to the actuation mechanism to drive the dynamic model, obtaining the 6-DOF displacement response of the upper pedal subsystem fixing point, including linear displacement in three directions and angular displacement in three directions.

[0080] Step 106: Construct the first finite element model of the boarding pedal structure, and obtain the vibration condition structural damage of the boarding pedal structure based on the second displacement signal and the first finite element model.

[0081] Optionally, a detailed finite element model of the upper pedal assembly is established, including structures such as brackets, pedals, and decorative covers, as well as connections such as bolts and welds, while retaining the fixed end structure within a 500mm range. In a multibody dynamics simulation environment, a dynamic model of the upper pedal is established, and a 6-DOF actuation mechanism is established at a fixed position. The upper pedal subsystem is made flexible through CB modal analysis. The 6-DOF displacement response is input to drive the system model, and the modal participation factor is obtained. In a durability simulation environment, the modal participation factor and modal stress are coupled to obtain the full-field time-domain stress amplitude. The components are grouped by structural material grade. For non-metallic materials, a stress-based durability analysis method is used, applying the material SN curve. For metallic materials, a strain-based durability analysis method is used, applying the material EN curve. For welded materials, the structural stress method or notched stress method is used for durability analysis. All analysis methods require mean stress correction. Fatigue life calculations based on the critical plane method and the Minor damage accumulation criterion are performed to obtain the damage of the upper pedal structure under real road vibration conditions.

[0082] Step 108: Configure the pedal application position corresponding to the pedal structure in the first finite element model, determine the pedal force corresponding to the pedal application position, and obtain the pedal condition structural damage corresponding to the pedal application position based on the pedal application position and the pedal force in the second test cycle.

[0083] The second test cycle refers to the number of times the stomping force is applied, which is used to characterize the number of times the stomping force is applied at the location where it is applied.

[0084] Optionally, in the finite element analysis environment, a fixed load is applied to the boarding pedal to simulate the passenger boarding and alighting conditions, and the finite element results file under unit load is output. In the durability simulation environment, the unit load results are scaled according to the requirements of the enterprise or user, generally to a fixed value or layered block loads. The damage calculation method used afterwards is the same as that for the vibration condition.

[0085] Step 110: Based on the structural damage under vibration conditions and the structural damage under stepping conditions corresponding to the location where the stepping force is applied, obtain the durability analysis results of the vehicle pedal structure.

[0086] Optionally, a combined working condition can be established, which couples the damage of vibration and pedaling conditions. The damage is scaled and accumulated according to the number of cycles of each condition to obtain the comprehensive damage of the pedal. At the same time, the lifespan can be converted according to the requirements of the enterprise or user, and a final durability analysis can be performed.

[0087] The number of cycles is determined based on the first test cycle and the second test cycle. For example, if the total number of cycles for testing structural damage under vibration conditions is M and the first test cycle is m, then the number of cycles for vibration conditions is M / m. Similarly, if the total number of cycles for testing structural damage under trampling conditions is N and the second test cycle is n, then the number of cycles for trampling conditions is N / n.

[0088] In the aforementioned method for analyzing the durability of the vehicle treadmill pedal, a vibration load spectrum test is performed on the fixed structure of the treadmill pedal during the first test cycle. Acceleration signals are collected using at least one accelerometer installed on the fixed structure, and a first displacement signal is obtained based on the acceleration signals. The fixed structure has fixed points. A multibody dynamics model of the fixed structure is constructed based on the first displacement signal, and a second displacement signal of the fixed points is obtained based on the multibody dynamics model. A first finite element model of the treadmill pedal structure is constructed, and the vibration condition structural damage is obtained based on the second displacement signal and the first finite element model. The application position of the pedal force is configured in the first finite element model, and the corresponding pedal force is determined. During the second test cycle, the pedal condition structural damage corresponding to the application position is obtained based on the application position and the pedal force. The durability analysis results of the treadmill pedal structure are obtained based on the vibration condition structural damage and the pedal condition structural damage corresponding to the application position. This method can improve the accuracy of the durability analysis of vehicle treadmill pedals.

[0089] In one embodiment, a method for analyzing the durability of a vehicle's foot pedal includes:

[0090] In the first test cycle, vibration load spectrum testing was conducted on the vehicle step fixing structure. Acceleration signals were collected using four three-directional accelerometers installed at different locations on the vehicle step fixing structure. Each three-directional accelerometer acquired one set of acceleration signals. From the four sets of acceleration signals, the X, Y, and Z directions of the first set of acceleration signals were acquired; the Z direction of the second set of acceleration signals was acquired; the Z direction of the third set of acceleration signals was acquired; and the Y and Z directions of the fourth set of acceleration signals were acquired, resulting in seven signal channels. A first Butterworth high-pass filter and a first signal integration were performed on the seven signal channels to obtain the velocity signal. A second Butterworth high-pass filter and a second signal integration were performed on the velocity signal to obtain the initial displacement signal. A third Butterworth high-pass filter was performed on the initial displacement signal to obtain the first displacement signal. The vehicle step fixing structure is equipped with fixing points for the vehicle step structure.

[0091] A second finite element model of the vehicle's footboard fixing structure is constructed. Based on the installation position of each three-directional acceleration sensor, at least one first local coordinate system based on the footboard fixing structure and at least one second local coordinate system based on the ground are constructed. Multi-degree-of-freedom (DOF) drive data corresponding to the footboard fixing structure and the ground are established based on the first local coordinate system, the second local coordinate system, and seven channel signals. Drive signals are obtained based on the DDF drive data and the first displacement signal. An initial multibody dynamics model is constructed based on the drive signal and the second finite element model. Within the initial multibody dynamics model, the second finite element model is made more flexible to obtain the multibody dynamics model corresponding to the footboard fixing structure. The second displacement signal of the fixed point is obtained based on the multibody dynamics model.

[0092] A first finite element model of the boarding pedal structure is constructed, and the modal participation factor of the boarding pedal structure is obtained based on the second displacement signal and the second multibody dynamics model. The material type of each component of the boarding pedal structure is determined. Based on the modal participation factor and the material type of each component of the boarding pedal structure, the structural damage of the boarding pedal structure under vibration conditions is calculated.

[0093] In the first finite element model, the pedal application positions corresponding to the pedal structure are configured, and the corresponding pedal forces are determined. In the second test cycle, based on the pedal application positions and pedal forces, the structural damage under the pedaling conditions corresponding to the pedal application positions is obtained.

[0094] The first test cycle determines the first cycle number. Based on the first cycle number and the structural damage under vibration conditions, the total damage under vibration conditions is obtained. The second test cycle determines the second cycle number. Based on the second cycle number and the structural damage under stepping conditions corresponding to the applied stepping force location, the sub-damage under stepping conditions corresponding to the applied stepping force location is obtained. Based on the number of applied stepping force locations and the sub-damage under stepping conditions corresponding to each applied stepping force location, the total damage under stepping conditions is obtained. Based on the total vibration condition damage and the total stepping condition damage, a comprehensive damage is obtained, which serves as the durability analysis result for the upper vehicle pedal structure. If the durability analysis result does not meet the preset conditions, the upper vehicle pedal structure is adjusted, and the process returns to the step of performing vibration load spectrum testing on the fixed structure of the upper vehicle pedal in the first test cycle, and continues.

[0095] In one feasible implementation, such as Figure 2 As shown, a method for analyzing the durability of a vehicle's foot pedal specifically includes:

[0096] Step 201 involves acquiring the vibration load spectrum. The test object is the fixed structure of the vehicle's upper pedal. Generally, depending on the type of vehicle, this system can be the body or the frame assembly. However, the principle of the sensor placement is the same: to reflect the overall kinematic and dynamic characteristics of the system through acceleration vibration signals from multiple measurement points. The sensor measurement point arrangement is as follows... Figure 3 As shown, points 31, 32, 33, and 34 require the placement of three-directional acceleration sensors. It is essential to ensure that the measuring points are located near the fixed points of the crossbeam, i.e., in areas with relatively high stiffness, and that the fixed position of the vehicle's footboard (e.g., point 35) is located between measuring points 31 and 33 (or 32 and 34). The test condition is a reliable and durable road surface required by the enterprise or specific user. The test sampling frequency should be at least 10 times the upper limit of the frequency of interest, and at least three cycles of the test condition signal should be measured, selecting one cycle signal with an average standard deviation.

[0097] Step 202: Perform preprocessing operations such as de-scratching, de-trend term removal, and de-offset term removal on the obtained signal, and remove signals that are 10%-15% below the signal standard deviation to ensure that the pseudo-damage of each channel signal after removal is not less than 98% of the original signal.

[0098] Step 203, as follows Figure 4 As shown, to perform acceleration-to-displacement signal conversion, the first step is to filter the acceleration signal channels. Select... Figure 3 The signals from measuring point 31 in the XYZ directions, measuring point 32 in the Z direction, measuring point 33 in the Z direction, and measuring point 34 in the YZ directions are measured. Using signal processing software such as Tecware, a first Butterworth high-pass filter is simultaneously applied to all seven channels. The recommended starting frequency is above 2Hz, and an 8th-order zero-phase filter is used. The first signal integration is then performed to convert the acceleration signal into a velocity signal. The same process is repeated, performing a second Butterworth high-pass filter and a second signal integration to convert the velocity signal into a displacement signal. A third Butterworth high-pass filter is then performed to ensure the final displacement signal does not drift. The signal unit is changed to meters, and the displacement signal is output as a binary .asc file.

[0099] In one feasible implementation, regarding the selection of displacement channels, besides the four fixed Z-axis channels, any one of the four measuring points can be selected for the X-axis channel, while for the Y-axis channel, either one of the two front measuring points or either one of the two rear measuring points can be selected. It is particularly important to note that if the frame or body has very high rigidity (approximately a rigid body), any three of the four Z-axis channels can be selected, while the selection method for the other two direction channels remains unchanged. In subsequent processing, the frame or body does not need to be made more flexible.

[0100] Step 204, as follows Figure 5As shown, finite element modeling of the upper pedal fixing structure and finite element modeling of the frame are performed. First, the frame model is truncated, based on... Figure 3 The measurement point locations retain the crossbeam and longitudinal beam structure between the first and second main crossbeams of the chassis. The geometric model is categorized and named according to the component classification, typically in the format of part number-material grade-thickness information-version number. Geometric cleanup is performed, including extracting mid-surfaces, processing contour lines, and refining the area around bolt holes. Finite element mesh generation is executed, and element quality is checked to ensure it meets company specifications. Simultaneously, connection elements such as welds and bolts are modeled; welds use SEAM elements, and bolts are modeled using a hybrid of rigid and beam elements. The models of each component are then assembled. Relevant material cards are created, containing Young's modulus, density, and Poisson's ratio information, and attributes are assigned to each part, primarily thickness information. The percentage error between the simulation model's weight and the design value (or measured value) is checked to ensure it is less than 5%. A trial operation condition is set up, typically free modal analysis, with a frequency range defined as 1-50Hz, calculating at least 10 orders, and setting up control cards for modal analysis to output displacement. Nastran software was used to solve the calculations for the trial operation conditions. The results were analyzed to observe whether there were any abnormal vibration postures in the modal modes, so as to confirm that the system's flexibility was normal and output the finite element file.

[0101] Step 205, as follows Figure 6 As shown, dynamic analysis and drive decomposition of the upper pedal assembly are performed. In a multibody dynamics analysis environment, such as Simcenter3D software, a rigid body model of the upper pedal fixing structure, i.e., the frame, is first established. Based on... Figure 3 Four local coordinate systems belonging to the vehicle frame are established at coordinate positions 31-34. Simultaneously, four other local coordinate systems with the same coordinates are established, belonging to the ground. Using these local coordinate systems, and following the channel positions and directions selected in step 203, a dual-object (vehicle frame, ground) multi-degree-of-freedom drive is established. All drive inputs are given to the displacement signals obtained in step 203. It is particularly important that the drive signal step size be consistent with the reciprocal of the sampling frequency. The vehicle frame finite element file obtained in step 204 is imported, and the system is switched to the flexible body calculation module to perform CB modal calculations. At least 20 vibration modes and 6 static displacement compensation modes should be obtained. Returning to the multibody dynamics analysis environment, the CB modal calculation results are used for flexibility processing, and an empirical modal damping ratio value is input for each mode, ranging from 1% to 5%. Dynamic solutions are then performed at the center position of the upper pedal fixing point (…). Figure 3Measuring point 5 outputs a 6-DOF displacement, including linear displacement in 3 directions and angular displacement in 3 directions. The drive obtained from this decomposition is the load input for subsequent analysis of the upper vehicle pedal subsystem. The purpose of this decomposition is to allow for independent analysis of various structural schemes of the upper vehicle pedal subsystem.

[0102] Step 206, referring to step 204, performs finite element modeling of the boarding pedal system. The detailed finite element model of the boarding pedal includes the bracket, pedal, decorative cover, and connections such as bolts and welds, while retaining the longitudinal beam structure of the fixed end frame within a 500mm range. A rigid element is established, with the principal point being the center coordinates of the boarding pedal's fixed point and the slave points being all nodes at the fracture points of the fixed end structure. In the multibody dynamics analysis environment, referring to step 205, a rigid body model mechanism for the boarding pedal is established, along with a local coordinate system for the fixed point and a 6-DOF drive for two objects (boarding pedal and ground). The drive input is the drive result file obtained in step 205. CB modal calculations and flexibility processing are performed on the boarding pedal. The CB modal calculations output stress, displacement, nodal forces, and support forces. Multibody dynamics is then performed to solve the system's modal participation factors.

[0103] Step 207: Perform structural damage calculation under vibration conditions, such as... Figure 7As shown, in the fatigue durability simulation module, the finite element results (CB modal stress) are coupled with the load (modal participation factor) to form stress amplitude and strain amplitude. Then, the data is grouped according to material grade. For metallic materials, the module uses a strain method calculation based on low-cycle fatigue, inputting fatigue curves based on EN (strain-life) and cyclic stress-strain curves, typically obtained through material testing or empirical parameters from the Manson-Coffin and Ramberg-Osgood formulas. For non-metallic materials, the module uses a stress method calculation based on high-cycle fatigue, inputting fatigue curves based on SN (stress-life), also typically obtained through material testing or empirical parameters from the Basquiat formula. For weldable materials, such as welds, the module uses a welding material fatigue analysis calculation, inputting the main SN curve of the welding material based on the structural stress method or notched stress method, and inputting welding process correction coefficients. Mean stress parameter correction is then performed using Smith-Watson-Topper or Goodman correction methods to correct the SN or EN fatigue curves. Critical plane stress state confirmation was performed, selecting a critical plane method with 18 equally divided angles and surface crack patterns. Based on the reliability requirements of the enterprise or customer, the survival rate of the material curve was defined, typically 50% / 90% / 97.5% / 99%. Simultaneously, Neuber-based elastoplastic correction was performed to nonlinearly adjust the stress amplitude exceeding the yield strength. Rainflow counting was performed on the adjusted stress amplitude to obtain the number of cycles under different stress amplitudes. Reduction techniques were used to reduce the number of cycles for stress amplitudes with less structural damage to improve computational efficiency. Damage accumulation calculations based on Minor and Haibach were performed to obtain the fatigue damage of the upper pedal within one test cycle under vibration conditions.

[0104] Step 208: Perform damage calculation for the pedal application condition. In the finite element analysis environment, using the same finite element model of the pedal subsystem as in step 206, apply 6-DOF full constraints at the fixed-point rigid elements. For example... Figure 8 As shown, stepping forces are applied at points 81, 82, and 83 on the pedal, with the area of ​​each point approximately equal to the area of ​​the forefoot. The load direction can be vertical or a combination of vertical and lateral, with the amplitude set according to company specifications. A static analysis condition is set, outputting element displacement, stress, and nodal forces. In the fatigue durability simulation module, a block load with an amplitude coefficient of 0-1-0 is set to simulate the loading and unloading process of the stepping force. The finite element results (static stepping force) are matched with the load (block load amplitude coefficient), and the subsequent durability simulation process is the same. Figure 7 The steps are used to obtain the fatigue damage within one cycle at each pedal position.

[0105] Step 209 couples the damage results under various working conditions. A joint working condition is established, and the damage of the resulting unit is mapped and accumulated. The accumulation formula is: Total Damage = Vibration Condition Single-Cycle Damage * Number of Cycles + Trampling Condition Location 6 Single-Cycle Damage * Number of Cycles + Trampling Condition Location 7 Single-Cycle Damage * Number of Cycles + Trampling Condition Location 8 Single-Cycle Damage * Number of Cycles, where the number of cycles is the value required by the enterprise or customer. Result evaluation is performed, identifying high-risk structures and ranking durability hotspots through the post-processing module. When the total damage of any durability hotspot exceeds the specified damage threshold (generally 1), structural modifications are made, and the process returns to step 206 for iterative calculation until the total damage calculated in step 209 is less than the specified damage threshold, at which point the entire process ends.

[0106] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0107] Based on the same inventive concept, this application also provides a vehicle tread durability analysis device for implementing the above-mentioned vehicle tread durability analysis method. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more vehicle tread durability analysis device embodiments provided below can be found in the limitations of the vehicle tread durability analysis method above, and will not be repeated here.

[0108] In one embodiment, such as Figure 9 As shown, a vehicle step durability analysis device 900 is provided, comprising: a signal acquisition module 901, a signal conversion module 902, a first analysis module 903, a second analysis module 904, and an analysis and calculation module 905, wherein:

[0109] The signal acquisition module 901 is used to perform vibration load spectrum testing on the upper vehicle pedal fixing structure in the first test cycle. It acquires acceleration signals through at least one acceleration sensor installed on the upper vehicle pedal fixing structure and obtains the first displacement signal of the upper vehicle pedal fixing structure based on the acceleration signals. The upper vehicle pedal fixing structure is equipped with fixing points for the upper vehicle pedal structure.

[0110] The signal conversion module 902 is used to construct a multibody dynamics model corresponding to the fixed structure of the upper pedal based on the first displacement signal, and to obtain the second displacement signal of the fixed point based on the multibody dynamics model.

[0111] The first analysis module 903 is used to construct the first finite element model of the upper vehicle pedal structure and obtain the vibration condition structural damage of the upper vehicle pedal structure based on the second displacement signal and the first finite element model.

[0112] The second analysis module 904 is used to configure the pedal application position corresponding to the pedal structure in the first finite element model, determine the pedal force corresponding to the pedal application position, and obtain the pedal condition structural damage corresponding to the pedal application position based on the pedal application position and the pedal force in the second test cycle.

[0113] The analysis and calculation module 905 is used to obtain the durability analysis results of the vehicle pedal structure based on the structural damage under vibration conditions and the structural damage under stepping conditions corresponding to the location where the stepping force is applied.

[0114] In one embodiment, at least one acceleration sensor includes four three-directional acceleration sensors installed at different locations. Each three-directional acceleration sensor is used to acquire a set of acceleration signals. The signal acquisition module 901 is also used to acquire the X-axis signal, Y-axis signal, and Z-axis signal of the first set of acceleration signals, the Z-axis signal of the second set of acceleration signals, the Z-axis signal of the third set of acceleration signals, and the Y-axis signal and Z-axis signal of the fourth set of acceleration signals from the four sets of acceleration signals, respectively, to obtain seven channel signals. Based on the seven channel signals, the first displacement signal of the upper vehicle pedal fixing structure is acquired.

[0115] In one embodiment, the signal acquisition module 901 is further configured to perform a first Butterworth high-pass filter on the seven channel signals and perform a first signal integration to obtain a velocity signal; perform a second Butterworth high-pass filter on the velocity signal and perform a second signal integration to obtain an initial displacement signal; and perform a third Butterworth high-pass filter on the initial displacement signal to obtain a first displacement signal.

[0116] In one embodiment, the signal conversion module 902 is further configured to construct a second finite element model of the fixed structure of the upper pedal; obtain a driving signal based on the first displacement signal and seven channel signals; construct an initial multibody dynamics model based on the driving signal and the second finite element model; and perform flexible processing on the second finite element model in the initial multibody dynamics model to obtain the multibody dynamics model corresponding to the fixed structure of the upper pedal.

[0117] In one embodiment, the signal conversion module 902 is further configured to construct at least one first local coordinate system based on the mounting position of each three-directional acceleration sensor and at least one second local coordinate system based on the ground; establish multi-degree-of-freedom drive data corresponding to the mounting structure of the vehicle step and the ground based on the first local coordinate system, the second local coordinate system, and the seven channel signals; and obtain a drive signal based on the multi-degree-of-freedom drive data and the first displacement signal.

[0118] In one embodiment, the first analysis module 903 is further configured to obtain the modal participation factor of the upper vehicle pedal structure based on the second displacement signal and the second multibody dynamics model; determine the material type of each component of the upper vehicle pedal structure; and calculate the vibration condition structural damage of the upper vehicle pedal structure based on the modal participation factor and the material type of each component of the upper vehicle pedal structure.

[0119] In one embodiment, the analysis and calculation module 905 is further configured to: determine a first cycle number based on a first test cycle; obtain the total vibration condition damage based on the first cycle number and the structural damage under the vibration condition; determine a second cycle number based on a second test cycle; obtain the sub-damage under the pedaling condition corresponding to the pedaling force application position based on the second cycle number and the structural damage under the pedaling force application position; obtain the total pedaling condition damage based on the number of pedaling force application positions and the sub-damage under the pedaling condition corresponding to each pedaling force application position; and obtain a comprehensive damage based on the total vibration condition damage and the total pedaling condition damage, which serves as the durability analysis result of the vehicle pedal structure.

[0120] In one embodiment, the analysis and calculation module 905 is further configured to adjust the vehicle pedal structure and return to the signal acquisition module 901 if the durability analysis results do not meet the preset conditions.

[0121] Each module in the aforementioned vehicle step durability analysis device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0122] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 10As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores durability simulation data. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a method for analyzing the durability of a vehicle's treadmill pedal.

[0123] Those skilled in the art will understand that Figure 10 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0124] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to perform the following steps: In a first test cycle, a vibration load spectrum test is performed on the fixed structure of the vehicle's upper pedal; acceleration signals are collected using at least one acceleration sensor installed on the fixed structure; a first displacement signal of the fixed structure is obtained based on the acceleration signals; a fixing point of the upper pedal structure is configured on the fixed structure; a multibody dynamics model corresponding to the fixed structure is constructed based on the first displacement signal, and a second displacement signal of the fixing point is obtained based on the multibody dynamics model; a first finite element model of the upper pedal structure is constructed, and vibration condition structural damage of the upper pedal structure is obtained based on the second displacement signal and the first finite element model; the application position of the stepping force corresponding to the upper pedal structure is configured in the first finite element model, and the stepping force corresponding to the application position is determined; in a second test cycle, the stepping condition structural damage corresponding to the application position is obtained based on the application position of the stepping force and the stepping force; and the durability analysis result of the upper pedal structure is obtained based on the vibration condition structural damage and the stepping condition structural damage corresponding to the application position of the stepping force.

[0125] In one embodiment, when the processor executes the computer program, it further performs the following steps: obtaining the X-axis signal, Y-axis signal, and Z-axis signal of the first group of acceleration signals from the four groups of acceleration signals respectively, obtaining the Z-axis signal of the second group of acceleration signals, obtaining the Z-axis signal of the third group of acceleration signals, obtaining the Y-axis signal and Z-axis signal of the fourth group of acceleration signals, and obtaining seven channel signals; and obtaining the first displacement signal of the upper vehicle pedal fixing structure based on the seven channel signals.

[0126] In one embodiment, when the processor executes the computer program, it further performs the following steps: performing a first Butterworth high-pass filter on the seven channel signals and performing a first signal integration to obtain a velocity signal; performing a second Butterworth high-pass filter on the velocity signal and performing a second signal integration to obtain an initial displacement signal; and performing a third Butterworth high-pass filter on the initial displacement signal to obtain a first displacement signal.

[0127] In one embodiment, when the processor executes the computer program, it further performs the following steps: constructing a second finite element model of the fixed structure of the boarding pedal; obtaining a driving signal based on a first displacement signal and seven channel signals; constructing an initial multibody dynamics model based on the driving signal and the second finite element model; and performing flexible processing on the second finite element model in the initial multibody dynamics model to obtain the multibody dynamics model corresponding to the fixed structure of the boarding pedal.

[0128] In one embodiment, when the processor executes the computer program, it further performs the following steps: constructing at least one first local coordinate system based on the mounting position of each three-directional acceleration sensor and at least one second local coordinate system based on the ground; establishing multi-degree-of-freedom drive data corresponding to the mounting structure of the vehicle step and the ground based on the first local coordinate system, the second local coordinate system, and the seven channel signals; and acquiring drive signals based on the multi-degree-of-freedom drive data and the first displacement signal.

[0129] In one embodiment, when the processor executes the computer program, it further performs the following steps: obtaining the modal participation factor of the upper vehicle pedal structure based on the second displacement signal and the second multibody dynamics model; determining the material type of each component of the upper vehicle pedal structure; and calculating the vibration condition structural damage of the upper vehicle pedal structure based on the modal participation factor and the material type of each component of the upper vehicle pedal structure.

[0130] In one embodiment, when the processor executes the computer program, it further performs the following steps: determining a first cycle number based on a first test cycle; obtaining the total vibration condition damage based on the first cycle number and the structural damage under the vibration condition; determining a second cycle number based on a second test cycle; obtaining the sub-damage of the pedaling condition corresponding to the pedaling force application position based on the second cycle number and the structural damage under the pedaling force application position; obtaining the total pedaling condition damage based on the number of pedaling force application positions and the sub-damage of the pedaling condition corresponding to each pedaling force application position; and obtaining the comprehensive damage based on the total vibration condition damage and the total pedaling condition damage, which serves as the durability analysis result of the vehicle pedal structure.

[0131] In one embodiment, when the processor executes the computer program, it also performs the following steps: if the durability analysis results do not meet the preset conditions, adjust the upper pedal structure, return to the step of performing vibration load spectrum test on the upper pedal fixed structure in the first test cycle, and continue execution.

[0132] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, it performs the following steps: Vibration load spectrum testing is conducted on the upper pedal fixing structure during a first test cycle; acceleration signals are collected using at least one acceleration sensor installed on the upper pedal fixing structure; a first displacement signal of the upper pedal fixing structure is obtained based on the acceleration signals; the upper pedal fixing structure has fixing points configured on it; a multibody dynamics model corresponding to the upper pedal fixing structure is constructed based on the first displacement signal; a second displacement signal of the fixing points is obtained based on the multibody dynamics model; a first finite element model of the upper pedal structure is constructed; vibration condition structural damage of the upper pedal structure is obtained based on the second displacement signal and the first finite element model; the application position of the stepping force corresponding to the upper pedal structure is configured in the first finite element model; the stepping force corresponding to the application position is determined; in a second test cycle, the stepping condition structural damage corresponding to the application position is obtained based on the application position and the stepping force; and the durability analysis result of the upper pedal structure is obtained based on the vibration condition structural damage and the stepping condition structural damage corresponding to the application position.

[0133] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: obtaining the X-axis signal, Y-axis signal and Z-axis signal of the first group of acceleration signals from the four groups of acceleration signals respectively, obtaining the Z-axis signal of the second group of acceleration signals, obtaining the Z-axis signal of the third group of acceleration signals, obtaining the Y-axis signal and Z-axis signal of the fourth group of acceleration signals, and obtaining seven channel signals; and obtaining the first displacement signal of the upper vehicle pedal fixing structure based on the seven channel signals.

[0134] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: performing a first Butterworth high-pass filter on the seven channel signals and performing a first signal integration to obtain a velocity signal; performing a second Butterworth high-pass filter on the velocity signal and performing a second signal integration to obtain an initial displacement signal; and performing a third Butterworth high-pass filter on the initial displacement signal to obtain a first displacement signal.

[0135] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: constructing a second finite element model of the fixed structure of the boarding pedal; obtaining a driving signal based on a first displacement signal and seven channel signals; constructing an initial multibody dynamics model based on the driving signal and the second finite element model; and performing a flexible processing on the second finite element model in the initial multibody dynamics model to obtain a multibody dynamics model corresponding to the fixed structure of the boarding pedal.

[0136] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: constructing at least one first local coordinate system based on the mounting position of each three-directional acceleration sensor and at least one second local coordinate system based on the ground; establishing multi-degree-of-freedom drive data corresponding to the mounting structure of the vehicle step and the ground based on the first local coordinate system, the second local coordinate system, and the seven channel signals; and acquiring drive signals based on the multi-degree-of-freedom drive data and the first displacement signal.

[0137] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: obtaining the modal participation factor of the upper vehicle pedal structure based on the second displacement signal and the second multibody dynamics model; determining the material type of each component of the upper vehicle pedal structure; and calculating the vibration condition structural damage of the upper vehicle pedal structure based on the modal participation factor and the material type of each component of the upper vehicle pedal structure.

[0138] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining a first cycle number based on a first test cycle; obtaining the total vibration condition damage based on the first cycle number and the structural damage under the vibration condition; determining a second cycle number based on a second test cycle; obtaining the sub-damage of the pedaling condition corresponding to the pedaling force application position based on the second cycle number and the structural damage under the pedaling force application position; obtaining the total pedaling condition damage based on the number of pedaling force application positions and the sub-damage of the pedaling condition corresponding to each pedaling force application position; and obtaining the comprehensive damage based on the total vibration condition damage and the total pedaling condition damage, which serves as the durability analysis result of the vehicle pedal structure.

[0139] In one embodiment, when the computer program is executed by the processor, it further implements the following steps: if the durability analysis results do not meet the preset conditions, adjust the upper pedal structure, return to the step of performing vibration load spectrum test on the upper pedal fixing structure in the first test cycle, and continue execution.

[0140] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps: In a first test cycle, a vibration load spectrum test is conducted on a vehicle pedal fixing structure; acceleration signals are collected using at least one acceleration sensor installed on the vehicle pedal fixing structure; a first displacement signal of the vehicle pedal fixing structure is obtained based on the acceleration signals; a fixing point of the vehicle pedal structure is configured on the vehicle pedal fixing structure; a multibody dynamics model corresponding to the vehicle pedal fixing structure is constructed based on the first displacement signal; a second displacement signal of the fixing point is obtained based on the multibody dynamics model; a first finite element model of the vehicle pedal structure is constructed; and vibration condition structural damage of the vehicle pedal structure is obtained based on the second displacement signal and the first finite element model; the application position of the stepping force corresponding to the vehicle pedal structure is configured in the first finite element model; the stepping force corresponding to the application position is determined; in a second test cycle, the stepping condition structural damage corresponding to the application position of the stepping force is obtained based on the application position of the stepping force and the stepping force; and the durability analysis result of the vehicle pedal structure is obtained based on the vibration condition structural damage and the stepping condition structural damage corresponding to the application position of the stepping force.

[0141] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: obtaining the X-axis signal, Y-axis signal and Z-axis signal of the first group of acceleration signals from the four groups of acceleration signals respectively, obtaining the Z-axis signal of the second group of acceleration signals, obtaining the Z-axis signal of the third group of acceleration signals, obtaining the Y-axis signal and Z-axis signal of the fourth group of acceleration signals, and obtaining seven channel signals; and obtaining the first displacement signal of the upper vehicle pedal fixing structure based on the seven channel signals.

[0142] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: performing a first Butterworth high-pass filter on the seven channel signals and performing a first signal integration to obtain a velocity signal; performing a second Butterworth high-pass filter on the velocity signal and performing a second signal integration to obtain an initial displacement signal; and performing a third Butterworth high-pass filter on the initial displacement signal to obtain a first displacement signal.

[0143] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: constructing a second finite element model of the fixed structure of the boarding pedal; obtaining a driving signal based on a first displacement signal and seven channel signals; constructing an initial multibody dynamics model based on the driving signal and the second finite element model; and performing a flexible processing on the second finite element model in the initial multibody dynamics model to obtain a multibody dynamics model corresponding to the fixed structure of the boarding pedal.

[0144] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: constructing at least one first local coordinate system based on the mounting position of each three-directional acceleration sensor and at least one second local coordinate system based on the ground; establishing multi-degree-of-freedom drive data corresponding to the mounting structure of the vehicle step and the ground based on the first local coordinate system, the second local coordinate system, and the seven channel signals; and acquiring drive signals based on the multi-degree-of-freedom drive data and the first displacement signal.

[0145] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: obtaining the modal participation factor of the upper vehicle pedal structure based on the second displacement signal and the second multibody dynamics model; determining the material type of each component of the upper vehicle pedal structure; and calculating the vibration condition structural damage of the upper vehicle pedal structure based on the modal participation factor and the material type of each component of the upper vehicle pedal structure.

[0146] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: determining a first cycle number based on a first test cycle; obtaining the total vibration condition damage based on the first cycle number and the structural damage under the vibration condition; determining a second cycle number based on a second test cycle; obtaining the sub-damage of the pedaling condition corresponding to the pedaling force application position based on the second cycle number and the structural damage under the pedaling force application position; obtaining the total pedaling condition damage based on the number of pedaling force application positions and the sub-damage of the pedaling condition corresponding to each pedaling force application position; and obtaining the comprehensive damage based on the total vibration condition damage and the total pedaling condition damage, which serves as the durability analysis result of the vehicle pedal structure.

[0147] In one embodiment, when the computer program is executed by the processor, it further implements the following steps: if the durability analysis results do not meet the preset conditions, adjust the upper pedal structure, return to the step of performing vibration load spectrum test on the upper pedal fixing structure in the first test cycle, and continue execution.

[0148] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data shall comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0149] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. 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). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0150] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0151] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for analyzing the durability of a vehicle's foot pedal, characterized in that, The method includes: In the first test cycle, a vibration load spectrum test is performed on the upper pedal fixing structure. Acceleration signals are collected by at least one acceleration sensor installed on the upper pedal fixing structure, and a first displacement signal of the upper pedal fixing structure is obtained based on the acceleration signals. The upper pedal fixing structure is equipped with fixing points for the upper pedal structure. A multibody dynamics model corresponding to the upper vehicle pedal fixing structure is constructed based on the first displacement signal, and a second displacement signal of the fixing point is obtained based on the multibody dynamics model. A first finite element model of the vehicle boarding pedal structure is constructed, and the vibration condition structural damage of the vehicle boarding pedal structure is obtained based on the second displacement signal and the first finite element model. In the first finite element model, the pedal structure is configured with the pedal force application position, and the pedal force corresponding to the pedal force application position is determined. In the second test cycle, the pedal force application position and the pedal force are used to obtain the pedal force application condition structure damage corresponding to the pedal force application position. Based on the structural damage under the vibration condition and the structural damage under the stepping condition corresponding to the position where the stepping force is applied, the durability analysis results of the vehicle pedal structure are obtained.

2. The method according to claim 1, characterized in that, The at least one acceleration sensor includes four three-directional acceleration sensors installed at different locations. Each three-directional acceleration sensor is used to acquire a set of acceleration signals. Acquiring the first displacement signal of the upper vehicle pedal fixing structure based on the acceleration signals includes: From the four sets of acceleration signals, the X-axis, Y-axis and Z-axis signals of the first set of acceleration signals are obtained, the Z-axis signal of the second set of acceleration signals is obtained, the Z-axis signal of the third set of acceleration signals is obtained, and the Y-axis and Z-axis signals of the fourth set of acceleration signals are obtained, resulting in seven channel signals. The first displacement signal of the upper vehicle pedal fixing structure is obtained based on the seven channel signals.

3. The method according to claim 2, characterized in that, The step of obtaining the first displacement signal of the upper vehicle pedal fixing structure based on the seven channel signals includes: The seven channel signals are subjected to a first Butterworth high-pass filter and a first signal integration to obtain the velocity signal; The velocity signal is subjected to a second Butterworth high-pass filter and a second signal integration to obtain the initial displacement signal; The initial displacement signal is subjected to a third Butterworth high-pass filter to obtain the first displacement signal.

4. The method according to claim 2, characterized in that, The step of constructing a multibody dynamics model corresponding to the upper vehicle pedal fixing structure based on the first displacement signal includes: Construct a second finite element model of the aforementioned upper vehicle pedal fixing structure; The driving signal is obtained based on the first displacement signal and the seven channel signals; An initial multibody dynamics model is constructed based on the driving signal and the second finite element model. In the initial multibody dynamics model, the second finite element model is made flexible to obtain the multibody dynamics model corresponding to the fixed structure of the upper pedal.

5. The method according to claim 4, characterized in that, The step of obtaining the driving signal based on the first displacement signal and the seven channel signals includes: Based on the installation position of each three-directional acceleration sensor, at least one first local coordinate system based on the fixed structure of the vehicle's foot pedal and at least one second local coordinate system based on the ground are constructed. Based on the first local coordinate system, the second local coordinate system, and the seven channel signals, establish multi-degree-of-freedom drive data for the fixed structure of the vehicle pedal and the ground. The driving signal is obtained based on the multi-degree-of-freedom driving data and the first displacement signal.

6. The method according to claim 1, characterized in that, The step of obtaining the vibration condition structural damage of the upper vehicle pedal structure based on the second displacement signal and the first finite element model includes: Based on the second displacement signal and the second multibody dynamics model, the modal participation factor of the upper vehicle pedal structure is obtained; Determine the material type of each component of the upper pedal structure; Based on the modal participation factor and the material type of each component of the upper pedal structure, the vibration condition structural damage of the upper pedal structure is calculated.

7. The method according to claim 1, characterized in that, The durability analysis results of the vehicle pedal structure are obtained based on the structural damage under the vibration condition and the structural damage under the pedaling condition corresponding to the position where the pedaling force is applied, including: The first cycle number is determined based on the first test cycle, and the total damage of the vibration condition is obtained based on the first cycle number and the structural damage under the vibration condition. The second cycle number is determined based on the second test cycle. Based on the second cycle number and the structural damage of the stepping condition corresponding to the stepping force application position, the sub-damage of the stepping condition corresponding to the stepping force application position is obtained. The total damage of the trampling condition is obtained based on the number of locations where trampling force is applied and the sub-damage of each trampling condition corresponding to the location where trampling force is applied. Based on the total damage under the vibration condition and the total damage under the stepping condition, a comprehensive damage is obtained, which serves as the durability analysis result of the vehicle pedal structure.

8. The method according to claim 1, characterized in that, The method further includes: If the durability analysis results do not meet the preset conditions, adjust the upper pedal structure, return to the step of performing vibration load spectrum test on the upper pedal fixing structure in the first test cycle, and continue execution.

9. A device for analyzing the durability of a vehicle's foot pedal, characterized in that, The device includes: The signal acquisition module is used to perform vibration load spectrum testing on the upper vehicle pedal fixing structure in the first test cycle. It acquires acceleration signals through at least one acceleration sensor installed on the upper vehicle pedal fixing structure and obtains the first displacement signal of the upper vehicle pedal fixing structure based on the acceleration signals. The upper vehicle pedal fixing structure is equipped with fixing points for the upper vehicle pedal structure. The signal conversion module is used to construct a multibody dynamics model corresponding to the upper vehicle pedal fixing structure based on the first displacement signal, and to obtain the second displacement signal of the fixing point based on the multibody dynamics model. The first analysis module is used to construct a first finite element model of the upper vehicle pedal structure, and to obtain the vibration condition structural damage of the upper vehicle pedal structure based on the second displacement signal and the first finite element model. The second analysis module is used to configure the pedal application position corresponding to the upper pedal structure in the first finite element model, determine the pedal force corresponding to the pedal application position, and obtain the pedal condition structural damage corresponding to the pedal application position based on the pedal application position and the pedal force in the second test cycle. The analysis and calculation module is used to obtain the durability analysis results of the vehicle pedal structure based on the structural damage under the vibration condition and the structural damage under the stepping condition corresponding to the position where the stepping force is applied.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 8.

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