鉄道車両の車内騒音低減のための吊り床構造の提案

Abstract

This work presents a study to reduce interior noise of railway vehicle by suspending floor plate from side wall of carbody. Recently speedup and weight reduction of railway vehicle were achieved, interior noise can be higher because of rail noise and vibration transfer from bogie, which is transferred through traction link, floor of carbody, and joists to floor plate. The frequency of these structure borne noise is from tens to hundreds of Hz, and is considered difficult to reduce these low-frequency noise. Then lower vibration of side wall is noted by measuring carbody vibration, and suspended floor is proposed to reduce vibration transfer from carbody to floor plate. Two stationary vibration tests are conducted to by applying suspended floor to Shinkansen-type test vehicle. In the tests floor plate is suspended by band plate, wire, or plate from rack or skirt and rail noise is adopted by actuator, or by running on roller. Finally, vibration and interior noise reduction is achieved successfully.