Transactions of Nanjing University of Aeronautics & Astronautics
Dynamic Resonant Frequency Bands of Suspension System of Vehicles with Varying Speeds Based on Time-Frequency Spectrum
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Abstract:
The dynamic responses of suspension system of a vehicle travelling at varying speeds are generally non-stationary random processes， and the non-stationary random analysis has become an important and complex problem in vehicle ride dynamics in the past few years. This paper proposes a new concept， called dynamic frequency domain （DFD）， based on the fact that the human body holds different sensitivities to vibrations at different frequencies， and applies this concept to the dynamic assessment on non-stationary vehicles. The study mainly includes two parts， the first is the input numerical calculation of the front and the rear wheels， and the second is the dynamical response analysis of suspension system subjected to non-stationary random excitations. Precise time integration method is used to obtain the vertical acceleration of suspension barycenter and the pitching angular acceleration， both root mean square （RMS） values of which are illustrated in different accelerating cases. The results show that RMS values of non-stationary random excitations are functions of time and increase as the speed increases at the same time. The DFD of vertical acceleration is finally analyzed using time-frequency analysis technique， and the conclusion is obviously that the DFD has a trend to the low frequency region， which would be significant reference for active suspension design under complex driving conditions.
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O324
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