철도차량 분야에 OTPA 적용 연구

초록

As train speed is higher, indoor noise management becomes more important, and thus characteristics of the noise sources should be identified at first. In this paper, to analyze contributions of these noise sources Operational Transfer Path Analysis (OTPA) is used. OTPA has some advantages of executing the contribution rates of several sources simultaneously, and necessary data can be measured while running. Transfer functions between reference measurement points and response measurement points are obtained. And the frequency characteristics of the noise source are successfully derived. Also the interior noise is predicted and compared with measurement data to show the reliability.