Modeling and Analysis of Amplitude-Frequency Characteristics of Torsional Vibration for Automotive Powertrain

Abstract EN

In the present paper, the amplitude-frequency characteristics of torsional vibration are discussed theoretically and experimentally for automotive powertrain.

A bending-torsional-lateral-rocking coupled dynamic model with time-dependent mesh stiffness, backlash, transmission error etc.

is proposed by the lumped-mass method to analysis the amplitude-frequency characteristic of torsional vibration for practical purposes, and equations of motive are derived.

The Runge–Kutta method is employed to conduct a sweep frequency response analysis numerically.

Furthermore, a torsional experiment is performed and validates the feasibility of the theoretical model.

As a result, some torsional characteristics of automotive powertrain are obtained.

The first three-order nature torsional frequencies are predicted.

Torsional behaviors only affect the vibration characteristics of a complete vehicle at low-speed condition and will be reinforced expectedly while increasing torque fluctuation.

Gear mesh excitations have little effects on torsional responses for such components located before mesh point but a lot for ones behind it.

In particular, it is noted that the torsional system has a stiffness-softening characteristic with respect to torque fluctuation.