트럭 가속주행시 소음원 규명 및 저감

The regulation of the pass-by-noise has become severe in 1996. In order to reduce the pass-by-noise, noise sources ,have to be identified at first. Lead wrapping method is used for source ranking test. It was found that major sources are the engine and the exhaust system in the commercial vehicle, Samsung 15t dump truck. The pass-by-noise level is then reduced by the modifications of engine enclosure and the redesign of exhast system.