전달함수를 이용한 철도차량 실내소음 기여도 분석 및 분포도 측정

초록

Speed-up and mass reduction of railway vehicle causes increase of the interior noise. One of the best ways to reduce the interior noise is to identify the noise level radiated from each of parts in the cabin. In this paper, We describe the method to estimate the interior noise and evaluate the noise contribution to each of parts. This method is based that sound pressure can be calculated by using frequency response function and acceleration. According to analysis of noise contribution, we validated that the noise radiated from the floor is the highest in the cabin. We also measured the noise distribution for the side by using the microphone array in order to analyze the effect of the noise flowing into the cabin from the outdoors. Finally, we presented the plan of the interior noise reduction based on the noise levels radiated from each of parts.