基于加速不平衡响应的柔性转子无试重动平衡
Balancing of Flexible Rotors Based on Accelerating Unbalance Response without Trial Weights

针对传统柔性转子平衡方法操作繁杂、效率低等问题，提出基于转子加速起动瞬态响应，通过遗传算法识别不平衡量的方法对转子进行平衡。在转子不平衡量识别过程中，将初始不平衡大小和方位视为设计变量，建立相应的有限元模型，构建理论计算响应与实测瞬态响应逐步逼近的逆问题并迭代求解。该方法测量信息少，全程无需添加试重。为验证所提方法的可行性，利用Bently RK4转子试验台，首先对一双盘转子进行了有限元模型和试验模型相关性验证。在保证有限元模型置信度的前提下，进行模拟转子平衡试验，平衡后两盘的瞬态振动挠度明显降低。试验结果表明，该方法能准确识别转子不平衡的大小和方位，提高平衡效率。
Traditional flexible rotor steady-state balancing methods expose many disadvantages such as complex operations and low efficiency. Based on rotor transient unbalance response during accelerating process, flexible rotor is balanced in this paper using the genetic algorithm to identify the initial mass unbalance. The identification strategy is to minimize the difference between calculated transient response from the appropriately established finite element model and measured data in which the magnitudes and angels of initial unbalance are regarded as design variables. Without adding trial weights, the proposed method requires much less data measuring. To verify the feasibility of this method, a double disk rotor balancing test was carried out on Bently RK4 test rig after model verification of the finite element model using model updating techniques. The transient vibration deflections of the two disks are significantly reduced after balancing. Experimental results show that the method can identify the unbalance of a flexible rotor accurately and efficiently