Unlike the better balanced straight-six or even the ultra-smooth V-12 engine, the humble four-cylinder generates an up and down vibration with a frequency of twice the crankshaft's rotational speed.

不像运行起来比它更稳定的直列六缸引擎或者极其流畅的V - 12引擎，卑微的四缸引擎会以一种比自身机轴转速高两倍的频率产生一上一下的振动。

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With the frequency as a fundamental parameter of vibration isolation, engine vibration isolation problems have been successfully solved.

以频率作为隔振的主要参数，成功地解决了发动机的隔振问题。

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Then the author analyses the effect of the frame vibration and tries to make the natural frequency of vibration beyond the range of engine revolution rate.

分析了发动机振源对车架振动的影响，使车架主要模态的自振频率避开了发动机转速范围；

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