A method for inherent characteristics analysis of powertrain mounting systems by considering parametric uncertainty and correlation

Abstract

In order to deal with the complex situation that parametric uncertainty and correlation coexist in the automotive powertrain mounting system (PMS),an uncertainty analysis method for calculating the natural frequency and decoupling rate of PMS was proposed.In the proposed method,the multi-dimensional parallelepiped model was firstly constructed to describe the PMS parameters with uncertainty and correlation.Then,the uncertain responses of the natural frequency and decoupling rate were calculated by integrating the regulation technique,Taylor series expansion and central difference method.Next,the analysis procedure of the proposed method was presented.Finally,the Monte Carlo method was used as a reference method for comparison and verification.The numerical analysis results show that the correlation of uncertain parameters of PMS has a certain influence on the inherent characteristics of the system.The method presents acceptable computational accuracy and higher computational efficiency in solving the uncertain response of PMS,which provides important reference for the calculation,evaluation and optimization design of the inherent characteristics of automotive PMS.

Keywords

• mechanical dynamics and vibration; powertrain mounting system; multidimensional parallelepiped model; inherent characteristics; uncertainty; correlation