Load decomposition of vehicle chassis components based on 3D digital road

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (17) : 213-221.

DONG Guojiang1,2, WANG Wei1, DU Fei1, HAN Yong1

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Abstract

The load spectrum of car chassis components is the key factor to analyze components’ fatigue performance.The traditional extracting load spectrum method with the virtual iteration has disadvantages of long development period and high cost.Here, the elevation data of typical reinforced road surface roughness in test field were collected to establish a 3D digital road model, and the test field’s typical reinforced road tests were conducted.Monitoring signals of a real car wheel center force’s six components, suspension and car body key points were obtained.Based on the software ADAMS/CAR, the rigid-flexible coupled multi-body dynamic model of the whole vehicle was established, and the obtained whole vehicle model and tire model were verified using indoor bench tests.The 3D digital road method and the virtual iteration method were used to perform the whole vehicle multi-body dynamic simulation, and the simulation data and real vehicle testing signals were analyzed contrastively from data statistics angles of time domain, frequency domain, RMS value, pseudo damage ratio and penetration count.The results showed that the accuracy of simulation data based on 3D digital road is slightly lower than that based on virtual iterative method, but overall trends of time domain and frequency domain curves of monitoring signals obtained using the two methods are basically the same under various typical road surface conditions; the relative error of RMS value is less than 30%, and the pseudo damage ratio is within the range of 0.65-1.70 to meet accuracy requirements of subsequent fatigue analysis; 3D digital road simulation can reflect load condition of reinforced road surface more accurately, and further improve efficiency and reduce cost in initial stage of car parts development.

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load decomposition / 3D digital road / virtual iteration / rigid-flexible coupled multi-body model / tire model

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DONG Guojiang, WANG Wei, DU Fei, HAN Yong. Load decomposition of vehicle chassis components based on 3D digital road[J]. Journal of Vibration and Shock, 2021, 40(17): 213-221

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