The generating process of pistonknock 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。
2
It has also been clear that the source of pistonknock 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。
3
It is proved that the improvement of piston structure is effective to decrease the impact force and the knock noise caused by the piston.