具有初始弯曲转子振动峰值的控制方法

VIBRATION CONTROL METHOD FOR THE ROTOR WITH INITIAL BENDING

本文从理论上研究了控制初始弯曲引起的转子振动幅值的一种新方法。通过在与转轴初始弯曲方向成较大夹角的方向添加不平衡质量的方法 ,使转子新的不平衡方向与初始弯曲方向夹角接近 180° ,则可以减小转子在临界转速附近的振幅。无论新的不平衡参数大于或小于初始弯曲参数 ,只要新的不平衡参数不至于太大 ,则临界转速附近的振幅响应肯定会得到改善。特别是当新的不平衡参数近似等于初始弯曲参数时 ,无论转速高低 ,振幅都会大幅下降。当重力参数、外阻尼系数和内阻尼系数改变后仍有同样结论。本文援引文献 [2 ]中的实例对这种方法进行了验证 ,并给出了解决类似故障的步骤。

A new method of reducing the peak vibration amplitude of a rotor with initial bending is studied in the paper.Adding an unbalance mass on the opposite side of the direction of initial bending to make the angle between the initial bending and the new unbalance direction near 180°will decrease the peak amplitude of the vibration response,no matter whether the new unbalance parameter is larger or smaller than the initial bending parameter,but best effect will be achieved if the two parameters are equal.If the new unbalamce parameter is too big,the peak amplitude will increase.The method is still effective when the gravity parameter,external and inner damping coefficients are changed.Finally,an example in literatureis quoted to illustrate the usage and effectiveness of the new method.The method can be used in practice to solve the vibration problem caused by the initial bending shaft.