论文部分内容阅读
研究了速度360 km/h下车厢两端玻璃门关闭前后高速列车车内的噪声特性。车内声压级结果显示,在300 Hz以上的频率范围内,关门后的车厢中心声压级呈现频率越高,下降越多的趋势。在300 Hz以下频段,由于车门关闭后车内声腔发生变化,使该频段的声压级有明显下降。通过声品质客观参数:响度、尖锐度、粗糙度和抖动度,客观评价了关门前后车厢中心的声品质,得到关门前后响度、尖锐度、粗糙度明显下降,但抖动度上升的结果。这主要是由于关门后声腔发生改变,使得响应大幅降低的同时低频脉冲感有所增加。
The noise characteristics of the high-speed train car before and after the closing of the glass door at both ends of the car at 360 km / h were studied. The sound pressure level in the car showed that in the frequency range above 300 Hz, the sound pressure level in the center of the car after closing showed the trend of higher frequency and decreasing. In the frequency band below 300 Hz, the sound pressure level of the frequency band obviously drops due to the change of the sound chamber in the car after the door is closed. Through the objective parameters of acoustic quality: loudness, sharpness, roughness and jitter, objectively evaluated the sound quality of the car center before and after the door was closed, the loudness, sharpness and roughness decreased obviously before and after the door was closed, but the jitter increased. This is mainly due to changes in the sound chamber after closing, resulting in a substantial reduction in response with an increase in the sense of low frequency impulses.