The wave form and the spectrum of impact force as well as the variation in sound exposure level (SEL) at a fixed point were measured which representing the relative changes of the ringing noise.
对一些板和梁进行了撞击试验，测量了撞击力随时间变化的波形及其频谱。
The wave form and the spectrum of impact force as well as the variation in sound exposure level (SEL) at a fixed point were measured which representing the relative changes of the ringing noise.
对一些板和梁进行了撞击试验，测量了撞击力随时间变化的波形及其频谱。
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