But the common linear fatigue damage cumulative rule neglects the fatigue damage which is brought by the high frequency and low stress.

一般的线性损伤累积理论忽略了高频率低疲劳应力所引起的构件疲劳损伤，致使预测结果与实际寿命相差很大。

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New type of precision cropping machine utilizes variant frequency vibration to crop bar precisely with low stress.

新型下料机是利用变频振动实现低应力精密下料的。

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A new type of precision cropping machine utilizes variant frequency vibration to crop bar precisely with low stress, an system of measure and control of vibration in the machine is necessary.

新型下料机是利用变频振动实现低应力下料的，针对需要建立振动的有效测控系统的问题。

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