"VIBRATION AND NOISE ANALYSIS INSIDE MOTOR- CAR "

Abstract

This work ls concerned with an investigation into the vibro - acoustic problem in vehicle structure. It is b sed on the concept of the creation of the measurements while the vehicle is driven on the chassis dynamometer in the laboratory. The data obtained ere discussed from the point of view of describing the vehicle structure performances. Based on this technique a complete appraisal is made for the saloon vehicle considered, and the reasons for its par-

ticular vibro - acoustic response are exposed. By using this technique, the potentially noisy elements forming the vehicle floor panel have been identified. The effect of vehicle speed, gear- shift and tractive effort loading var- iations on the vibro- acoustic performanceof_the -.ehiole• etructure are•included and critically examined w:l,th.. respect to improvements.

A historical review of published work has been introd­ uced and displayed a need for extra work on studying such problem particularly for complete vehicle. This is followed _by the description of the instrumentation system and teat

procedure as used in this work.