【摘要】 测量了车速达250km/h的高速铁路动车组列车不同距离、不同高度处的噪声,分析了其时间、频谱及空间分布特性,并与普通客运列车比较。结果表明,动车组列车噪声表现为较强的脉冲性,频谱较宽,为2500Hz内的宽频噪声,200Hz以下的低频成分很强;不同高度处最大声压级随距离的衰减规律基本类似,但不同高度处频谱不同。更多还原

【Abstract】 Noise levels of China railway high-speed (CRH) operating at 250 km/h were monitored and measured simultaneously at 12 points located at 4 distances (30,50,70 and 90 m) from the rail center and 3 heights (0,3 and 6 m above the rail). The CRH noise characteristics (time and frequency profiles) were analyzed and compared with the same of an ordinary train operating at 120 km/h. The noise of CRH was impulsive with a wide frequency range up to 2 500 Hz. Below 200 Hz,noise of CRH was strong. The noise levels declined similarly with distance and height; the noise of each height had its own frequency profile pattern.更多还原