确定振动是由入口调节门后中心涡流引起的气流周期性高脉动造成的。
Vibration is caused by periodic high pulsation of airflow resulted from the center eddy behind the inlet damper.
研究螺旋桨空泡及其诱导的船体脉动压力的预报方法，对于减小其引起的船尾振动和辐射噪声是极其重要的。
It is very important to study methods for predicting propeller cavitation and induced fluctuations in order to reduce vibrations and noise on ships.
泵输出的周期性脉动流体的压力脉动，是引起流体谐振、激励管路振动和噪声的主要原因。
The pressure pulsation induced by the pumped periodic pulsation fluid is the main factor of causing fluid resonance and stimulating pipelines vibrations and noise.
混流式水轮机尾水管内螺旋形涡带引起的压力脉动是造成混流式水轮机组振动的主要根源之一，严重威胁机组的安全运行。
For Francis turbines, the pressure pulsation in draft-tubes induced by helical vortex rope is one of the main problems and it would seriously affect the safe operation of the unit.
提出消除振动的主要对策，包括避免固有频率接近引起的谐振、减少压力脉动及接蓄能器吸收振动等。
The vibration dispose countermeasures which includes preventing resonance caused by same inhere frequency, lessening pressure puke and using accumulator to absorb vibration etc.
结果表明，在自由振动后的尾迹中，湍流脉动引起的能量输运能力比动量输运能力强，湍流的梯度输运假设与实验结果符合较好。
It has been proved that vortices transport heat more effectively than momentum, and gradient transport assumption is found to be valid for the turbulence field.
本文通过尾水管内流动的模拟，导出了由尾水涡带所引起的周期性振动的振动频率和脉动压力的计算公式。
This paper gives the flow simulation of hydraulic turbine draft tubes. Then, the calculation formula of the frequency and force of vibration of the draft tube are derived.
飞机液压系统由于油压脉动引起的管道振动是近十多年来国内外航空工业界极为重视的工程实际问题。
The pipeline vibration caused by pressure surge in aircraft hydraulic system is an important engineering problem both to domestic and foreign aviation industries in recent decades.
飞机液压系统由于油压脉动引起的管道振动是近十多年来国内外航空工业界极为重视的工程实际问题。
The pipeline vibration caused by pressure surge in aircraft hydraulic system is an important engineering problem both to domestic and foreign aviation industries in recent decades.
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