Method and device for testing fatigue of whole vehicle

Abstract

The invention provides a method and device for testing the fatigue of a whole vehicle, and the method comprises the steps: obtaining the data of the whole vehicle and road test data; building a finite element model of the whole vehicle according to the data of the whole vehicle; calibrating the finite element model of the whole vehicle according to the road test data; carrying out the fatigue testing of the whole vehicle according to the calibrated finite element model of the whole vehicle, and obtaining a testing result. According to the embodiment of the invention, the finite element model is built, and the calibration of the finite element model is carried out according to the road test data, thereby enabling the finite element model of the whole vehicle to remain consistent with the characteristics of a sample vehicle, improving the accuracy of the model, and improving the fatigue testing precision. Meanwhile, compared with a many-body dynamics load decomposition process, the method employs a modeling mode, thereby reducing the cooperation between the professional departments, simplifying the workflow, and avoiding the errors caused by the many-body dynamics load decomposition.

Description

technical field [0001] The invention relates to the technical field of vehicle testing, in particular to a vehicle fatigue testing method and device. Background technique [0002] Vehicle fatigue performance is one of the important indicators of vehicle safety performance. In recent years, with the rapid development of domestic pure electric vehicle technology, more and more new energy pure electric vehicles have been used by people. Due to the existence of the battery module system of pure electric vehicles, pure electric vehicles are heavier than traditional vehicles, so the working conditions of the whole vehicle are more severe. Therefore, the requirements for automobile fatigue performance are also higher. During the use of automobiles, the fatigue performance of automobiles is not up to the standard, which leads to fatigue failure of key components, causing automobiles to break down, and even accidents of car crashes and fatalities occur from time to time. This kind ...

AI Technical Summary

Problems solved by technology

[0005] 1. The load decomposition method needs to establish a dynamic model and decompose the load to the connection point of each part. The decomposed load needs to be applied to the part during the fatigue test of each part, and the amount of data and workload are large.

[0006] 2. Body and chassis fatigue tests need to be modeled separately and cannot be carried out at the same time

[0007] 3. The load spectrum decomposition needs to be decomposed in the multi-body dynamics software. Therefore, the fatigue test task can only be completed by the cooperation of multi-disciplinary engineers. In the transmission and processing of data, due to the work experience and processing habits of different engineers, human errors will occur. Reduced accuracy of fatigue testing

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