  By new advancements in vehicle manufacturing; evaluation of vehicle quality
assurance has got a more critical issue. Today noise and vibration generated
inside and outside the vehicles are more important factors for customers than
previous. So far several researchers have focused on interior noise transfer
path analysis and the results have been published in related papers but each
method has its own limitations. In present work, the vibration transfer path
analysis and vibration path ranking of a car interior has been performed. As
interior vibration is a source of structural borne noise problem, thus the
results of this research can be used to present the structural borne noise
state in a vehicle. The method proposed in this paper, in opposite of the
earlier methods, do not need to disassemble the power train from the chassis.
The procedure shows a good ability of vibration path ranking in a vehicle and
is an effective tool to diagnose the vibration problem inside the vehicle. The
simulated vibration spectrums in different speeds of the engine have a good
compliance with the tested results however some incompatibilities exist and
have been discussed in details. The simulated results show the strength of the
method in engine mount optimization.
