Study of powertrain isolation of vehicles including frame flexibility

Abstract

Powertrain in vehicle is a major source of excitation of noise and vibration for a vehicle. It significantly contributes to Noise, Vibration and Harness characteristics of complete vehicle. The powertrain is mounted on the frame through powertrain mounts. These mounts provide support and isolates the vibration of powertrain from rest of the vehicle. The energy from powertrain is transmitted to chassis and surrounding parts through mounts of powertrain. This paper focus on study of powertrain isolation and its parameters by simplifying powertrain as 6 DOF model mounted on rigid foundation with isolators as one part. In that a simple powertrain model is developed with rigid foundation to study powertrain mounting system. Analytical model is developed to study isolators parameters like stiffness, orientation, and location. This model results are validated using available simulation software. In addition to this paper also include the dynamic interaction between powertrain and remaining vehicle including suspension and frame flexibility. The objective of the paper is defined as to study the effect of suspension system on rigid body modes and study of effect of coupled model of frame flexibility and suspension system on dynamic properties of complete vehicle using analytical method.