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Feedforward Rotor Fault Compensation
Structural Control and Health Monitoring ( IF 5.4 ) Pub Date : 2020-02-08 , DOI: 10.1002/stc.2527
Matheus F. Wu 1 , Katia L. Cavalca 1 , Richard Markert 2
Affiliation  

When damaged, it is not unusual to observe nonlinear responses in previously linear structures. Specifically, in rotating machinery context, unbalance, misalignment, bearing, and shaft damage occur during operation, and their responses arise as a combination of multiple modes and harmonics. These vibration effects are undesirable and, besides compromising the system performance, can propagate or generate further faults. In practice, the machine cannot be simply stopped for repairs, and a method for provisory attenuating such problems is desirable. The fault effects can be approximated by a set of loads distributed along the healthy rotor linear model approximation. Intuitively, one can also estimate counteractive forces to mitigate the fault symptoms. Therefore, this work proposes a simple feedforward approach to detect and compensate fault effects at multiple harmonics in rotors. The compensating force is calculated to minimize the least square modal difference between healthy and faulty rotor. A test rig is operated in distinct conditions to demonstrate and validate the method highlighting different fault symptoms (unbalance, misalignment, and shaft bow).

中文翻译:

前馈转子故障补偿

当损坏时,观察先前线性结构中的非线性响应并不罕见。具体而言,在旋转机械环境中,运行过程中会发生不平衡,不对中,轴承和轴损坏,并且它们的响应是多种模式和谐波的组合而产生的。这些振动影响是不希望的,并且除了损害系统性能外,还可能传播或生成更多故障。实际上,不能简单地将机器停下来进行修理,因此希望有一种减轻这种问题的方法。可以通过沿着健康转子线性模型近似分布的一组载荷来近似故障影响。凭直觉,人们还可以估计反作用力以减轻故障症状。因此,这项工作提出了一种简单的前馈方法来检测和补偿转子中多次谐波时的故障影响。计算补偿力以最小化正常转子与故障转子之间的最小平方模态差异。测试设备在不同的条件下运行,以演示和验证突出显示不同故障症状(不平衡,未对准和竖井弯曲)的方法。
更新日期:2020-02-08
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