The generating process of piston knock noise is thoroughly analyzed by the study of piston motion state and knock process with the engine at the rated engine speed.
进一步分析了发动机额定转速下，活塞的运动姿态和敲击过程，揭示出活塞敲击噪声的产生过程。
It has also been clear that the source of piston knock noise is the impact between piston and cylinder sleeve by the vibration acceleration of the engine's body surface.
又通过发动机机体表面振动加速度，确定活塞敲击噪声产生的根源在于活塞与缸套的碰撞冲击。
It is proved that the improvement of piston structure is effective to decrease the impact force and the knock noise caused by the piston.
说明改进活塞的结构，对于降低活塞碰撞冲击力和活塞敲击噪声具有一定的效果。
It is proved that the improvement of piston structure is effective to decrease the impact force and the knock noise caused by the piston.
说明改进活塞的结构，对于降低活塞碰撞冲击力和活塞敲击噪声具有一定的效果。
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