缺点：脆性，使用时注意尽量避免或减少敲击，摔打，突然性碰撞等。
Shortcoming: fragility, Pay attention to avoid or reduce knock and bang and sudden collision.
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.
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 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 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.
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