燃料电池有轨电车声学优化*

基于线路噪声实验,系统测试分析了燃料电池有轨电车的噪声特性,研究了噪声分布以及空气传声、结构传声路径对噪声的贡献。结果表明改善车辆地板、空调、顶板和风挡的隔声性能,尤其是在500～1250 Hz的1/3倍频带范围内的隔声性能将有助于改善车辆内部声学环境。优化燃料电池系统控制,降低冷却单元转速将有助于改善车辆外部声学环境。在此基础上提出减震降噪建议措施,再次进行线路噪声实验,结果表明该措施有效。

Acoustics optimization of fuel cell tram

Based on field measurement, the characteristics of the noise source of fuel cell tram are analyzed in this work. The interior noise sources and the contributions of the air-borne and the structural-borne sound are identified. The results show that improving the sound insulation performance of the floor, roof and vestibule diaphragm, especially in the frequency of 500~1250 Hz 1/3 octave band will help to improve the acoustic environment of the tram interior. Optimal control of fuel cell system and reducing the cooling unit speed will help improve vehicle exterior acoustic environment. Base on the Analysis, this paper puts forward the suggestion of the shock absorption and noise reduction in the car, and carries out type test of vehicle interior noise, and the results are effective.