Vehicle-mounted charging pile vibration fatigue acceleration test method and device coping with frequent moving scene, and medium

Abstract

The invention relates to the technical field of vehicle-mounted charging pile testing, in particular to a vehicle-mounted charging pile vibration fatigue acceleration testing method and device for coping with frequent moving scenes and a medium. Comprising the steps that multi-working-condition vibration data are collected, a vibration fatigue test model is built by combining the model of a to-be-tested piece, and key fatigue parts such as connector pins and circuit board welding spots are recognized through simulation analysis; designing a multi-axis acceleration loading spectrum based on a Miner linear cumulative damage theory, and applying a spatial six-degree-of-freedom vibration load by adopting a multi-axis vibration table; deploying acceleration, strain, temperature and charging function monitoring sensors, and constructing a multi-parameter cooperative monitoring system; implementing an acceleration test according to a preset loading spectrum, and automatically terminating when detecting that the structure fails, the function is abnormal or the damage accumulation value reaches a threshold value; and analyzing and generating a structure optimization scheme. According to the invention, the complex vibration environment of the vehicle-mounted charging pile in an actual frequent moving scene is accurately simulated, and the test efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle-mounted charging pile testing, and more particularly to a method, device, and medium for accelerating vibration fatigue testing of a vehicle-mounted charging pile in response to frequent movement scenarios. Background Art

[0002] At present, with the vigorous development of the new energy vehicle industry, on-board charging piles, as key equipment for electric vehicle energy replenishment, are experiencing an increasing market demand. In scenarios where vehicles are frequently moving, on-board charging piles will inevitably encounter various complex and changing vibration environments, such as smooth vibrations when driving on highways, complex vibrations when driving on mountain roads, and violent vibrations when driving on bumpy roads. These vibrations are not only related to road conditions, but are also affected by multiple factors such as driving speed and vehicle status (such as empty or fully loaded). Over a long period of time, these vibrations may cause fatigue damage to the internal structure of the charging pile, thereby affecting its service life and safety. Therefore, conducting vibration fatigue tests on on-board charging piles to ensure their reliability in complex vibration environments has become an indispensable part of the research and development and production of new energy vehicles.

[0003] However, current traditional vibration fatigue testing methods have many limitations and are unable to meet the high requirements of the new energy vehicle industry for the quality and reliability of charging piles. Specifically, these methods often use fixed vibration frequencies and amplitudes for testing, which cannot accurately simulate the dynamic, multi-dimensional vibration loads faced by on-board charging piles in actual frequent movement scenarios. For example, under different road conditions such as highways, mountain roads, and bumpy roads, the vibration frequency, amplitude, and direction to which the charging piles are subjected will vary significantly, and traditional testing methods can often only simulate one or a few of these conditions and cannot fully cover the complex vibration environment in actual use. The huge difference between this test environment and the actual use environment makes it difficult for the test results to accurately reflect the true fatigue condition of the charging piles, and cannot provide strong support for product design and optimization.

[0004] Furthermore, traditional testing methods suffer from long testing cycles and low efficiency. Due to a lack of in-depth application of fatigue damage theory, these methods often require repeated application of vibration loads over extended periods of time to observe fatigue damage in charging piles. This not only increases testing costs and time, but also fails to meet the demands of rapid R&D and production of new energy vehicles. In a highly competitive market, extended testing cycles can delay product launches, impacting a company's market competitiveness.

[0005] More critically, traditional testing methods are inadequate for testing critical fatigue areas of vehicle charging piles. Vehicle charging piles have complex internal structures, and vibration sensitivity and fatigue life vary significantly across different parts. However, traditional testing methods often lack the precise location and analysis of key fatigue areas, preventing the testing process from effectively focusing on areas most likely to experience fatigue damage. This not only reduces the specificity and effectiveness of the test, but also may overlook potential structural defects and safety hazards, failing to provide robust data support for structural optimization and improvement of charging piles.

[0006] In summary, existing vibration fatigue testing methods for on-board charging piles have significant shortcomings in simulating actual vibration environments, improving test efficiency, and accurately locating critical fatigue areas. Therefore, developing an accelerated vibration fatigue testing method that can accurately simulate the actual vibration environment of on-board charging piles in service, significantly improve test efficiency, and provide a scientific basis for structural optimization has become a pressing technical challenge for the new energy vehicle industry.

[0007] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0008] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0009] The embodiments of the present disclosure provide a vibration fatigue acceleration test method, device, and medium for an on-board charging pile that can cope with frequent movement scenarios, so as to solve the problems that the traditional testing methods proposed in the above background technology cannot accurately simulate complex vibration environments, have long test cycles, and are inefficient.

[0010] In some embodiments, the method comprises:

[0011] Determine the test environment and test objects, collect vibration data of the vehicle charging pile under different road conditions, driving speeds, and vehicle states in frequent movement scenarios, and determine the model and specifications of the charging pile to be tested;

[0012] Constructing a vibration fatigue test model. Based on the vibration data, a vibration fatigue test model for the vehicle charging pile is established using computer-aided analysis software to simulate the stress, strain, and displacement distribution under different vibration environments and identify key fatigue locations.

[0013] Design an accelerated test plan. Based on the key fatigue parts, use a multi-axial vibration table to apply multi-directional vibration loads. Combined with the linear cumulative damage theory, generate an accelerated loading spectrum to shorten the test cycle.

[0014] Install and connect test equipment, secure the vehicle charging station to a multi-axis vibration table, and deploy sensors to monitor vibration response, stress and strain, and temperature changes in real time;

[0015] Performing a vibration fatigue acceleration test, applying a vibration load according to the accelerated loading spectrum, and terminating the test until the charging pile experiences structural damage, functional failure, or reaches a preset damage accumulation threshold;

[0016] Analyze test data, evaluate fatigue life, and propose structural optimization solutions through failure mode analysis.

[0017] Preferably, the different road conditions include highways, mountain roads and bumpy roads, and the corresponding vibration frequency range is 1 to 200 Hz, and the amplitude range is 0.1 to 10 g; the vehicle-mounted states include empty and fully loaded.

[0018] Preferably, the computer-aided analysis software uses the finite element method to perform meshing and boundary condition setting on the charging pile, and the key fatigue parts include connector pins and circuit board solder joints.

[0019] Preferably, the accelerated loading spectrum is accelerated by increasing the vibration frequency, amplitude or number of cycles, and the total damage accumulation value is calculated based on Miner's linear cumulative damage theory.

[0020] Preferably, the sensor includes an acceleration sensor, a strain sensor and a temperature sensor, and the data acquisition frequency is not less than 1000 Hz.

[0021] Preferably, the preset damage accumulation threshold is 1, and the test termination condition includes at least one of structural damage, functional failure and damage accumulation value reaching the standard.

[0022] Preferably, the analysis of test data and evaluation of fatigue life are specifically carried out by: using MATLAB software to perform spectral analysis on the vibration signal to obtain the energy distribution of different frequency components; through stress-strain analysis, determining the stress amplitude and number of cycles of key fatigue parts under different vibration conditions; using Palmgren-Miner linear cumulative damage theory, calculating the fatigue damage cumulative value of key fatigue parts and evaluating the fatigue life of the charging pile.

[0023] Preferably, the multi-axis vibration table is a three-axis vibration table, which can simultaneously apply vibration loads in the X, Y and Z directions.

[0024] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the vibration fatigue acceleration test method for the vehicle-mounted charging pile in the frequent movement scenario when running the program instructions.

[0025] In some embodiments, the storage medium stores program instructions, and when the program instructions are run, they execute the vibration fatigue acceleration test method for vehicle-mounted charging piles that cope with frequent movement scenarios.

[0026] The embodiments of the present disclosure provide a method, device, and medium for accelerating vibration fatigue testing of an on-board charging pile in a frequently moving scenario, which can achieve the following technical effects:

[0027] The present invention collects vibration data from multiple road conditions and different vehicle-mounted states, uses finite element analysis to accurately locate the key fatigue parts of the charging pile, and designs a multi-axis acceleration loading spectrum in combination with Miner's linear cumulative damage theory. Through the coordinated monitoring of multiple sensors for acceleration, strain, temperature and charging function parameters, the test stop point is intelligently determined based on the triple conditions of structural failure, functional failure, and damage accumulation value reaching the standard, forming a full-process closed-loop system. This method can accurately simulate the complex vibration environment that the on-board charging pile is subjected to in actual frequent movement scenarios, significantly shorten the test cycle, improve test efficiency, and provide a scientific basis for the structural optimization and improvement of the charging pile.

[0028] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0030] Figure 1 It is a schematic flow chart of the method of the present invention;

[0031] Figure 2 It is a schematic diagram of the vibration environment of the present invention;

[0032] Figure 3 It is a schematic diagram of the data analysis type of the present invention;

[0033] Figure 4 It is a schematic diagram of the device structure provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0035] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0036] Unless otherwise stated, the term "plurality" means two or more.

[0037] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0038] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0039] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0040] Example 1

[0041] like Figure 1 As shown, a vibration fatigue acceleration test method for on-board charging piles to cope with frequent movement scenarios is proposed. This method can accurately simulate the complex vibration environment that on-board charging piles are subjected to in actual frequent movement scenarios, significantly shorten the test cycle, improve test efficiency, and provide a scientific basis for the structural optimization and improvement of charging piles.

[0042] Specifically, the method includes:

[0043] S1: Determine the test environment and test object, collect vibration data of the vehicle charging pile under different road conditions, driving speeds, and vehicle status in a frequently moving scenario, and determine the model and specifications of the charging pile to be tested.

[0044] S2: Construct a vibration fatigue test model. Based on the vibration data, a vibration fatigue test model of the vehicle charging pile is established through computer-aided analysis software to simulate the stress, strain and displacement distribution under different vibration environments and identify key fatigue parts.

[0045] S3: Design an accelerated test plan. Based on the critical fatigue parts, use a multi-axis vibration table to apply multi-directional vibration loads. Combined with the linear cumulative damage theory, generate an accelerated loading spectrum to shorten the test cycle.

[0046] S4: Install and connect the test equipment, fix the vehicle charging pile on the multi-axis vibration table, and deploy sensors to monitor vibration response, stress and strain, and temperature changes in real time.

[0047] S5: Performing a vibration fatigue acceleration test, applying a vibration load according to the acceleration loading spectrum, and terminating the test until the charging pile experiences structural damage, functional failure, or reaches a preset damage accumulation threshold.

[0048] S6: Analyze test data, evaluate fatigue life, and propose structural optimization solutions through failure mode analysis.

[0049] As a refinement of the above embodiment, the step S1 of determining the test environment and the test object specifically includes: clarifying the various vibration environments that the vehicle charging pile may encounter in the frequent movement scene, including different road conditions (such as highways, mountain roads, bumpy roads, etc.) Figure 2 As shown in the figure, vibration data at different driving speeds and different vehicle states (such as empty, fully loaded, etc.) At the same time, determine the model and specifications of the vehicle charging pile to be tested.

[0050] As a refinement of the above embodiment, step S2 of constructing a vibration fatigue test model specifically includes: establishing a vibration fatigue test model for a vehicle-mounted charging pile using finite element analysis software based on the determined test environment. In the model, the charging pile is meshed and boundary conditions are set, taking into account its structural characteristics, material properties, and installation method. By simulating the stress, strain, and displacement distribution of the charging pile under different vibration environments, the key fatigue locations of the charging pile are identified.

[0051] As a refinement of the above embodiment, in step S3, the accelerated test scheme is designed based on the identified key fatigue locations. A multi-axis vibration table is used to simulate complex vibration environments, setting different combinations of vibration frequency, amplitude, and vibration direction. Based on Miner's linear cumulative damage theory, the loading spectrum of the accelerated test is determined. By increasing the vibration stress level or the number of vibration cycles, the charging pile can achieve the desired fatigue damage level in a shorter period of time.

[0052] As a refinement of the above embodiment, step S4 of installing and connecting the test equipment specifically includes: securing the vehicle-mounted charging pile on a multi-axis vibration table according to the actual installation method, ensuring a secure installation. Connecting the charging pile's electrical circuits and sensors, including accelerometers, strain sensors, and temperature sensors, to monitor the charging pile's vibration response, stress and strain, and temperature changes in real time during vibration.

[0053] As a refinement of the above embodiment, performing the vibration fatigue accelerated test in step S5 specifically includes: activating a multi-axis vibration table and applying a vibration load according to the accelerated test protocol designed in step 3. During the test, sensor data is collected in real time to record the vibration response and performance parameter changes of the charging pile. The test is terminated if the charging pile shows obvious structural damage, functional failure, or reaches a preset cumulative fatigue damage value.

[0054] As a refinement of the above embodiment, the step S6 of analyzing the test data specifically includes: analyzing the collected test data, such as Figure 3 The analysis includes vibration response analysis, stress-strain analysis, and fatigue damage analysis. Using a fatigue life prediction model, the fatigue life of a vehicle charging pile in a frequently moving scenario is evaluated based on test data. The failure modes and causes of the charging pile are analyzed, providing a basis for structural optimization and improvement.

[0055] It should be noted that the key point of the present invention is to collect vibration data of multiple road conditions such as highways, mountain roads, bumpy roads, and vehicle states such as empty / full load, use finite element analysis to accurately locate key fatigue parts such as connector pins and circuit board solder joints, and design a multi-axis acceleration loading spectrum in combination with Miner linear cumulative damage theory. Through multi-sensor collaborative monitoring of acceleration, strain, temperature and charging function parameters, the test stop point is intelligently determined based on the triple conditions of structural failure, functional failure, and damage accumulation value reaching the standard, forming a full-process closed-loop system of "scenario definition-model construction-accelerated testing-data evaluation-optimization suggestions". The core technical features to be protected include multi-working condition vibration data collection methods, key part positioning technology based on finite elements, acceleration loading spectrum design driven by Miner theory, multi-parameter coupling monitoring and triple stop judgment rules, and standardized testing methods covering the entire process, which solve the problems of simulation distortion, low efficiency, and extensive evaluation of traditional test scenarios, and provide a scientific basis for the reliability optimization of charging piles. Compared with existing technologies, this invention can accurately simulate the complex vibration environment to which on-board charging piles are subjected in real-world, frequently moving scenarios. By designing an accelerated testing scheme, it shortens the testing cycle and improves testing efficiency. Furthermore, through analysis of test data and fatigue life assessment, it provides a scientific basis for optimizing and improving the structure of charging piles, helping to improve the service life and safety of on-board charging piles.

[0056] Example 2

[0057] This embodiment uses a specific charging pile as the test object and describes in detail the implementation process of a vibration fatigue acceleration test method for a vehicle-mounted charging pile in a frequently moving scenario.

[0058] Step 1: Determine the test environment and test objects

[0059] This charging station is suitable for electric vehicles in frequent mobile scenarios. Through field research and data collection, it is determined that the vibration environment that this charging station may encounter in actual use includes:

[0060] Highway driving: simulates a stable vibration environment with a vibration frequency range of 10 to 50 Hz and an amplitude of 0.1 to 0.5 g.

[0061] Mountain road driving: simulates a complex vibration environment with a vibration frequency range of 5 to 100 Hz and an amplitude of 0.5 to 2g.

[0062] Driving on bumpy roads: simulates a severe vibration environment with a vibration frequency range of 1 to 30 Hz and an amplitude of 2 to 5 g.

[0063] At the same time, two vehicle loading states are considered: no-load and full-load, to comprehensively evaluate the vibration fatigue characteristics of the charging pile under different load conditions.

[0064] Step 2: Build a vibration fatigue test model

[0065] Using the finite element analysis software ANSYS, a three-dimensional model of an on-board charging pile was constructed. The model detailed key structural components, including the charging pile's outer shell, internal circuit boards, and connectors. To ensure computational accuracy, the model was meshed using a tetrahedral grid with a 2mm mesh size. Based on the actual installation method of the charging pile, the mounting base was set as a fixed boundary condition. Through simulations, the stress, strain, and displacement distributions of the charging pile under different vibration conditions were determined, and key fatigue areas, such as connector pins and circuit board solder joints, were identified.

[0066] Step 3: Design an accelerated test plan

[0067] In order to shorten the test cycle and improve test efficiency, an accelerated test solution was designed. A three-axis vibration table was used to simulate a complex vibration environment. Three vibration directions (X, Y, and Z axes) were set to more realistically simulate the multi-dimensional vibration loads in actual use. Different vibration frequencies and amplitudes were designed for different road conditions:

[0068] Highway driving acceleration test: The vibration frequency is increased to 20-100 Hz, and the amplitude is increased to 0.2-1g.

[0069] Mountain road acceleration test: The vibration frequency is adjusted to 10-200 Hz, and the amplitude is increased to 1-4 g.

[0070] Acceleration test on bumpy roads: The vibration frequency is increased to 2-60 Hz, and the amplitude is increased to 4-10 g.

[0071] Combined with Miner's linear cumulative damage theory, the cumulative damage value under each vibration condition was calculated, and the number of test cycles was determined so that the test was stopped when the total cumulative damage value reached 1. This significantly shortened the test time while ensuring the accuracy of the test results.

[0072] Step 4: Install and connect test equipment

[0073] The onboard charging pile was securely fixed to a triaxial vibration table using a dedicated fixture. Strain sensors were attached to key fatigue areas, such as connector pins and circuit board solder joints, to monitor strain changes during vibration. Accelerometers were also installed on the vibration table surface and the charging pile casing to measure vibration acceleration. Furthermore, temperature sensors were installed on the circuit boards to monitor temperature changes during testing. Signal lines from all sensors were connected to the data acquisition system to ensure stable and reliable signal transmission.

[0074] Step 5: Perform vibration fatigue accelerated test

[0075] Start the triaxial vibration table and apply different vibration loads in sequence according to the designed acceleration test plan. The data acquisition system collects sensor data in real time at a sampling frequency of 1000 Hz, recording the acceleration, strain, and temperature changes of the charging pile. During the test, closely monitor the status of the charging pile. If cracks are detected on connector pins, loose solder joints on circuit boards, or the charging pile fails to charge properly, the test is stopped immediately and the test time and number of cycles are recorded.

[0076] Step 6: Analyze test data and estimate fatigue life

[0077] The collected test data was processed and analyzed in detail. Using MATLAB software, the vibration signal was spectrally analyzed to obtain the energy distribution of different frequency components, thereby identifying the frequency range that has the greatest impact on the vibration fatigue of the charging pile. Stress-strain analysis determined the stress amplitude and number of cycles at key fatigue locations under different vibration conditions, providing an important basis for fatigue life assessment. Finally, using the Palmgren-Miner linear cumulative damage theory, the cumulative fatigue damage values at key fatigue locations were calculated, the fatigue life of the charging pile was assessed, and a comparative analysis was conducted with the design life.

[0078] Test results revealed that connector pins and circuit board solder joints are weak links in charging piles, prone to fatigue cracking and separation during vibration. To address these issues, specific structural improvements were proposed, such as increasing pin strength, optimizing solder joint processes, and improving circuit board layout. Implementing these structural optimization solutions effectively improves the vibration fatigue resistance of on-board charging piles, extending their service life and enhancing their safety and reliability.

[0079] This embodiment forms a full-process closed-loop system of "scenario definition-model construction-accelerated testing-data evaluation-optimization suggestions", which provides a scientific basis and technical support for vibration fatigue testing and structural optimization of vehicle charging piles.

[0080] Combine Figure 4 As shown, the embodiment of the present disclosure also provides a vibration fatigue acceleration test device 300 for a vehicle-mounted charging pile for frequently moving scenarios, including a processor (processor) 304 and a memory (memory) 301. Optionally, the device may also include a communication interface (CommunicationInterface) 302 and a bus 303. Among them, the processor 304, the communication interface 302, and the memory 301 can communicate with each other through the bus 303. The communication interface 302 can be used for information transmission. The processor 304 can call the logic instructions in the memory 301 to execute the vibration fatigue acceleration test method for a vehicle-mounted charging pile for frequently moving scenarios of the above embodiment.

[0081] In addition, the logic instructions in the memory 301 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0082] Memory 301, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. Processor 304 executes the program instructions / modules stored in memory 301 to perform functional applications and data processing, thereby implementing the vibration fatigue acceleration testing method for vehicle-mounted charging piles in frequent mobility scenarios described in the above-mentioned embodiments.

[0083] The memory 301 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Furthermore, the memory 301 may include high-speed random access memory and non-volatile memory.

[0084] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned accelerated vibration fatigue test method for a vehicle-mounted charging pile in a frequently moving scenario.

[0085] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0086] The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program code, or a transient storage medium.

[0087] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, an element defined by the statement "comprises a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can be found in the description of the method part.

[0088] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0089] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, the functional units in the embodiments of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0090] The flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operations of the systems, methods and computer program products according to the embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A vibration fatigue acceleration test method for a vehicle-mounted charging pile in a frequently moving scenario, characterized in that: The following steps are involved: Determine the test environment and test objects, collect vibration data of the vehicle charging pile under different road conditions, driving speeds, and vehicle states in frequent movement scenarios, and determine the model and specifications of the charging pile to be tested; Constructing a vibration fatigue test model. Based on the vibration data, a vibration fatigue test model for the vehicle charging pile is established using computer-aided analysis software to simulate the stress, strain, and displacement distribution under different vibration environments and identify key fatigue locations. Design an accelerated test plan. Based on the key fatigue parts, use a multi-axial vibration table to apply multi-directional vibration loads. Combined with the linear cumulative damage theory, generate an accelerated loading spectrum to shorten the test cycle. Install and connect test equipment, secure the vehicle charging station to a multi-axis vibration table, and deploy sensors to monitor vibration response, stress and strain, and temperature changes in real time; Performing a vibration fatigue acceleration test, applying a vibration load according to the accelerated loading spectrum, and terminating the test until the charging pile experiences structural damage, functional failure, or reaches a preset damage accumulation threshold; Analyze test data, evaluate fatigue life, and propose structural optimization solutions.

2. The vibration fatigue acceleration test method for vehicle-mounted charging piles in frequent movement scenarios according to claim 1 is characterized in that: The different road conditions include highways, mountain roads and bumpy roads, with corresponding vibration frequencies ranging from 1 to 200 Hz and amplitudes ranging from 0.1 to 10 g; the vehicle states include empty and fully loaded.

3. The vibration fatigue acceleration test method for vehicle-mounted charging piles in frequent movement scenarios according to claim 1 is characterized in that: The computer-aided analysis software uses the finite element method to perform grid division and boundary condition setting on the charging pile, and the key fatigue parts include connector pins and circuit board solder joints.

4. The vibration fatigue acceleration test method for a vehicle-mounted charging pile in a frequently moving scenario according to claim 1 is characterized in that: The accelerated loading spectrum achieves acceleration by increasing the vibration frequency, amplitude or number of cycles, and calculates the total damage accumulation value based on Miner's linear cumulative damage theory.

5. The vibration fatigue acceleration test method for a vehicle-mounted charging pile in a frequently moving scenario according to claim 1 is characterized in that: The sensors include acceleration sensors, strain sensors and temperature sensors, and the data acquisition frequency is not less than 1000 Hz.

6. The vibration fatigue acceleration test method for vehicle-mounted charging piles in frequent movement scenarios according to claim 1 is characterized in that: The preset damage accumulation threshold is 1, and the test termination condition includes at least one of structural damage, functional failure, and damage accumulation value reaching the standard.

7. The vibration fatigue acceleration test method for a vehicle-mounted charging pile in a frequently moving scenario according to claim 1 is characterized in that: The test data is analyzed and fatigue life is evaluated by: using MATLAB software to perform spectrum analysis on the vibration signal to obtain the energy distribution of different frequency components; using stress-strain analysis to determine the stress amplitude and number of cycles of key fatigue parts under different vibration conditions; using Palmgren-Miner linear cumulative damage theory to calculate the fatigue damage accumulation value of key fatigue parts and evaluate the fatigue life of the charging pile.

8. The vibration fatigue acceleration test method for a vehicle-mounted charging pile in a frequently moving scenario according to claim 1 is characterized in that: The multi-axis vibration table is a three-axis vibration table that can simultaneously apply vibration loads in the X, Y, and Z directions.

9. A vibration fatigue acceleration test device for a vehicle-mounted charging pile in a frequently moving scenario, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the vibration fatigue acceleration test method for a vehicle-mounted charging pile in a frequent movement scenario as described in any one of claims 1 to 8 when running the program instructions.

10. A storage medium storing program instructions, characterized in that: When the program instructions are run, the vibration fatigue acceleration test method for a vehicle-mounted charging pile in a frequent movement scenario as described in any one of claims 1 to 8 is executed.

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