利用升速响应振幅进行柔性转子的模态平衡  

Novel Modal Balancing of Flexible Rotor by Using the Run-up Amplitude

作　　者：黄金平[1] 任兴民[1] 邓旺群[2] 

机构地区：[1]西北工业大学振动工程研究所,西安710072 [2]中国航空动力机械研究所,株洲412002

出　　处：《机械工程学报》2010年第5期55-62,共8页Journal of Mechanical Engineering

基　　金：航空科技创新基金资助项目(07B08004)

摘　　要：针对稳态平衡方法所面临的问题,提出利用起动过程中的瞬态幅度信息进行柔性转子双面平衡的新方法。该方法在三圆平衡法的基础上,引入测点模态比(Modal ratio among measurement points coefficient,MRMP coefficient)的概念,并通过转子起动过前两阶临界区的瞬态幅度求得两平衡面处的测点模态比,在此基础上将平衡试重组按一、二阶模态进行分解。改变试重组的角度,通过3次加试重起动过程,分别在一、二阶共振区内借助共振幅度值和对应阶模态试重组,利用三圆平衡法完成了对转子前两阶模态不平衡的校正。仿真和试验结果表明,所提出的不需要相位信息的平衡方法,不仅能有效降低转子的瞬态残余振动,而且避免了传统模态平衡方法对转子先验模态知识的过多要求,提高了平衡效率。In view of the disadvantages of steady-state balancing techniques, a novel double-plane balancing method of flexible rotor is proposed, in which the run-up transient amplitudes are utilized. Based on the three-circle balancing method（i.e, single-plane balancing without phase measurements）, the modal ratio among measurement points（MRMP coefficient） is introduced, and the MRMP coefficients among the two balancing planes are calculated by using the transient amplitudes during the rotor runs across its first two resonant regions, thus the trial weight group can be decomposed into its first and second modal components. Then, through 3 run-up processes, the three-circle balancing method is used to correct the first and second modal unbalances respectively, by using the corresponding resonant amplitudes and the corresponding trial weight component. Both the simulation and experiment results show that the proposed balancing method not only can reduce the transient residual vibrations effectively, but also avoid the requirement of prior rotor modal knowledge which is necessary for the traditional steady-state modal balancing method.

关 键 词：转子 转子平衡 模态平衡 起动过程 瞬态响应 

分 类 号：TB122[理学—工程力学]