从磁浮列车的噪声谱变化中观察多普勒效应

Observing Doppler Effect from the Changes of Noise Spectrum of Magnetically Levitated Train

通过对磁浮列车行驶时产生的噪声进行现场测试及分析,比较了列车靠近和离开时的噪声功率谱,观察并定量计算了其谱线频率的变化,从而为声波的多普勒效应提供了有效的教学及实验方法,也可为磁浮列车或其他高速列车行驶噪声的进一步研究提供有效的测量分析方法。

Through the measurement and analysis to the noise induced by moving magnetically levitated train, the noise power spectrum was compared when the train comes up and leaves, the changes of its spectral line frequency were observed and computed. It can provide effective methods of teaching and experiment not only for the Doppler effect of acoustic wave, but for further study of the noise induced by moving magnetically levitated trains and other high speed trains as well.