pulsating water meaning in Chinese

脉冲水

Finally finding that there are two reasons that cause vibration of pipe and noise . the one is the vibration of pump which transfers to pipe and stimulates the vibration of pipe . the second is the stimulating frequency of pulsating water is coherent with the natural frequency of pipe
最后得出管道的振动主要是由于两个原因，一是泵的机械振动传递给管道，引起管道的振动；二是由于水流的脉动激励频率与系统的固有频率相吻合，引起管道的共振发声。
So the pipe system sends out noise because of resonance . especially the frequency 250hz of pulsating water is in close proximity to natural frequency of pipe , so the 250hz is a dangerous frequency to the pipe system . there is another reason why the noise is reached to 110db ( a ) in pump room that the noise is magnified by the cistern because of the resonance of cistern
特别是激励频率为250hz的频率分量恰好与管道系统的固有频率相接近，其引起的管道振动对噪声的贡献最突出，同时也与水泵房房腔的固有频率相接近，从而引起房腔共鸣发声，使噪声进一步被放大，以至于噪声最大处高达105db ( a ) 。