Abstract: The noise experiments in a subway car were made. The measurement points were positioned at the centre of the cars body, and at the vestibule diaphragm and the bogie, respectively, above the floor with different heights. It is found that the noise at the airoutlet is 77.8 dB(A) in the case of static car. When the train was running, however, the noise of the subway car is 1.0-5.9 dB(A)　higher in the subway tunnel than that in the railway viaduct. Wheel/rail noise is the major contributor to the internal noise, while the noise from auxiliary equipments can usually be neglected in the measurement except the portions near the airoutlet in the running car. The coach airproof affects the noise distribution in the car, so the airproof of the door and the vestibule diaphragm should be improved.

Key words: acoustics, subway car, noise, measurement, tunnel, viaduct

摘要： 对地铁车辆在静止及运行情况下进行车内噪声测试。测点布置在车体中央、风挡及转向架上方距地板面不同高度处。在静止情况下，空调送风口处噪声值为77.8 dB(A)。车辆运行分为隧道内和高架上两种情况，隧道内运行时，车内相应点处的噪声值比高架上高1.0-5.9 dB(A)。车辆在运行过程中对车内噪声影响较大的是轮轨噪声，车辆附属设备影响较小。车辆的密封性对车内噪声的分布有较大的影响，应提高车门、风挡的密封性。

关键词: 声学, 地铁车辆, 噪声, 测试, 隧道, 高架