Abstract: An analysis method based on averaging method is built for the nonlinear oscillation characterization of mounting system dynamics of fuel cell vehicle powertrain. In the analysis, a two degree of freedom vibration model with piecewise-linearity rubber mounts is established, and the amplitude-frequency function is formulized by using averaging method. Based on the mathematical formula, the nonlinear resonance characteristics and its sensitivity to system parameters, including powertrain mass, piece-wise rubber mount stiffness, damping coefficient and excitation amplitude, are numerically analyzed. The simulation results show that the averaging method can be applied to the nonlinear powertrain mount system vibration analysis, and that the sensitivity analysis results are applicable to the powertrain mount system design and optimization.

Key words: Averaging method, Electric powertrain, Nonlinear vibration, Piecewise-linearity mounting system