차량소음예측 모델 ( Vehicle Noise Prediction Model )

The purpose of this study is to evaluate the noise from running vehiceles by their sources as machine operation and friction with air and road surface. Three types of vehicles, passenger cars, buses, and freight trucks, are tested on the concrete and aspalt pavements separately. The noise levels of vehicles were measured while vehicles were measured while vehicles were running at 40, 60 and 80 kilometers per hour with and without the engines were running. The overall noise levels from buses and trucks were similar while the noise from passenger cars were relatively smaller as expected. As speeds of vehicles were increased, the noise levels were also increased. The increasing rates of noise due to the increasing speeds were significantly different by types of vehicles. The noise levels were higher with concrete pavement than with asphalt pavement of the road. Since the noise level difference with different pavements are mainly due to the friction with road surface, the amounts of differences are notably different with speeds and types of vehicles.