Abstract
Nearly all drivetrain noise, vibration and harshness (NVH) issues appear to suggest a component or system malfunction, but in fact they are invariably error states of the complete vehicle dynamics system. Some drivetrain NVH issues are related to the conditions of lubrication in impact zones, some to engine irregularities (combustion or inertial dynamics), some to the driveline torsional eigen-modes, and others to resonant behaviour in the transfer path from source to body. All are highly complex non-linear system problems which are not easily or inexpensively palliated. Inevitably there is a need to fundamentally understand the noise generation mechanism, which can only partly be achieved through experimentation. There is a continuing strong case for the use of accurate CAE to describe and to predict how the initial perturbation can develop into an NVH issue. The modelling tool may then be used to identify design strategies for robust functionality.
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