Abstract
Vehicle interior noise holds paramount aspect in determining its overall quality since it affects the level of acoustic comfort of the passengers. From various methods of measuring noise inside a vehicle cabin, a measurement technique has been developed in this project to measure the interior vehicle noise from road input. This project proposes a simple noise measurement technique which is direct noise measurement when test vehicle is running on the dynamometer, road and airborne noise measurement. The comparison between measured Sound Pressure Level (SPL) from road input and dynamometer input shows the contribution of structure-borne noise due to tire-road interactions and aerodynamic excitation. The comparison between measured SPL for total interior noise (at stationary condition) and SPL for road input shows the contribution of noise from road input, vehicle suspension system, and aerodynamic excitation. British Standard BS 6086:1981 on method of measurement of noise inside motor vehicle had been followed closely to ensure high accuracy of results obtained from the direct noise measurements method.
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