A fatigue comparative analysis of chassis based on simulated road load spectrum and measured road load spectrum

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (12) : 179-186.

RONG Bing,XIAO Pan,ZHOU Jianwen

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Abstract

The measured load spectrum is always got by a mule car. The cost is high and applicability is limited. Promoting the development of simulation load spectrum acquisition technology by virtual road is thus meaningful. In this paper, based on the measured road load spectrum, the accuracy and practicability of simulated road load spectrum based on 3D virtual road were verified. First, a vehicle multibody dynamics model and 3D virtual road of resonance two for proving testing ground were established, then the simulated road load spectrum was obtained by dynamic simulation. Secondly, the measured road load spectrum from wheel force transducer and the simulated road load spectrum were compared in time domain and frequency domain. The accuracy of the simulated road load spectrum was verified. Finally, compared the chassis fatigue damage from simulation analysis, it was found that the fatigue damage distribution has exactly the same trend, the maximum damage ratios for lower control arm and knuckle are 1.79 and 2.43, respectively. To verify the correctness of the construction method for the 3D virtual road and vehicle multibody dynamics model, the practicability of fatigue load spectrum based on 3D virtual road was demonstrated.

Key words

Measured road load spectrum / Simulated road load spectrum / 3D virtual road modeling / Damage comparison

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RONG Bing,XIAO Pan,ZHOU Jianwen. A fatigue comparative analysis of chassis based on simulated road load spectrum and measured road load spectrum[J]. Journal of Vibration and Shock, 2018, 37(12): 179-186

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