Chiharu SATO

Research on the Application to the Railway Bridge Noise of the SEA Method in consideration Track Structure

Yasuyuki MIYAKI

This research is a investigation on the application to railway bridge noise of the statistical energy analysis method (the following SEA method). This SEA method involves the use of the calculation in the frequency bands of high and middle, and the bands are important as the noise.


�@As for the research of last year, the calculation of the input power in the SEA method was computed for the measured vibration acceleration level of the floor slab. The railway bridge noise was computed by this calculation for a certain measure of accuracy. However, this value of the floor slab shows different values on various bridges. This is the problem of noise prediction in the bridge of various forms. On the other hand, the value of the rail shows a typical value. The use of this value in the calculation of the SEA method eliminates the problem of application on the bridge of various forms. When we predict the railway bridge noise, the calculation of the input power has to computed at a typical value in the rail. Therefore this research performs the analysis considered track structure in the calculation of SEA method.

First of all, the calculation of the SEA method in this year modeled the track structure. Then, we compared the calculated results by the existence of the rubber pad subsystem on the same conditions. As a result, we observed that rubber pad was inapplicable to the subsystem in the SEA method. To avoid this problem, we have devised a process. The effect of rubber pad considered as the coupling loss factor in the SEA method. This process made possible application to the track structure in the SEA method.