Abstract
This paper describes the use of flexible multi-body dynamic models and noise transfer path
analysis to achieve vehicle level sound quality targets. The development of correlated
flexible multi-body dynamic models, supported by both finite element and experimental
modal analysis is shown. The results are then combined with time domain transfer path
analysis to enable interior sound to be rapidly predicted and assessed subjectively, under both
steady state and non-steady state conditions. The techniques are shown applied and validated
in a passenger car application.
The approach is used to study the effect on sound quality, at a vehicle level, of different
engine and vehicle options. Specifically, examples are given which show its application to
investigate the influence of the following:
o Fundamental engine structure and crankshaft layout including V8 and W8
o Balancer shafts
o Powertrain mounting system design
o Vehicle body
Conclusions are made about the best application of this methodology, and about its suitability
for noise prediction through the vehicle development process.
Keywords: Flexible, multi-body, dynamic, sound, quality