轨道车辆车内声品质客观评价分析

对上海轨道车辆9号线在不同运行速度下头部车厢、中部车厢和车厢连接处进行噪声现场测试，引入心理声学声品质参数：A计权声压级、特征响度、尖锐度、粗糙度和抖动强度，对不同工况下轨道车辆车内声场进行声品质的客观评价。结论表明，轨道车辆运行时车厢内部噪声以中低频噪声为主。随着车速提高，车内声品质下降，尤其是车厢连接处，声品质最差，应采取有效措施改善噪声环境，满足人耳的听觉舒适性。。

Objective Evaluation and Analysis of Interior Sound Quality of Rail Vehicles

The noises in the head vehicle, middle vehicles and vehicle’s connections of Shanghai Metro line 9 are measured respectively at different speeds. The objective evaluation of the measured interior noise is carried out according to the sound quality parameters of A-weighted sound pressure level, specific loudness, sharpness, roughness and fluctuation intensity based on the psycho-acoustical theory. The results show that most of the interior noises are low and middle frequency noises. The interior acoustic environments of the vehicles, especially of the vehicle’s connections need to be improved to satisfy the acoustic comfort requirement.