虑及双转速双平面无试重虚拟动平衡研究

Test-free virtual dynamic balance in consideration of double-rotation double-plane

针对多盘柔性转子多转速多平面平衡需要多次启停机的问题,研究了一种基于动力学响应分析的虑及双转速双平面无试重虚拟动平衡方法。利用有限元软件Dyrobes建立了与多盘柔性转子实验台动力学相似的有限元模型,通过对平衡校正面施加虚拟不平衡激励,计算了不同转速下不同测点的振动响应,提取了双平衡转速下不平衡激励与振动响应之间的映射关系,得到了不同转速下不同校正平面的影响系数矩阵;对多盘柔性转子不平衡振动进行了测试,将影响系数矩阵代入振动矢量方程,采用最小二乘法计算得到了校正矢量,进行了动平衡前后振动对比。研究结果表明:该方法能在无试重条件下完成对多盘柔性转子的多转速平衡,能够实现一次加重即降低多转速下转子基频振动的目的,显著减少了启停机次数,提高了动平衡效率。

In order to solve the multi speed and multi plane balancing problem a virtual dynamic balancing method based on dynamic re sponse analysis was proposed which allows for double speed and double plane test free virtual dynamic balancing. The finite element model that has similar dynamic characteristics with multiple disk flexible rotor test bench was established based on finite element softwore Dyrobes through applying virtual unbalance incentives to the balance plane the vibration response of the different measuring points under different ro tating speed was calculated the mapping relationship between incentive and vibration response was extracted under double balanced speed the influence coefficient matrix of different correction plane under different rotational speed was gotten. The unbalance vibration of multi disc flexible rotor was tested the influence coefficient matrix was substituted into the vibration vector equation and the correction vector was cal culated by the least square method. The results show that this method can balance the multi speed of the multi disk flexible rotor under the condition of no test weight and can achieve the purpose of reducing the fundamental frequency vibration of the rotor under the condition of multi speed significantly reduce the number of starting and stopping and improve the dynamic balancing efficiency.