On the Use of Actively Controlled Auxiliary Bearings in Magnetic Bearing Systems
On the Use of Actively Controlled Auxiliary Bearings in Magnetic Bearing Systems
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DOI：
10.1115/1.2982159
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发表时间：
2009-03
影响因子：
1.5
通讯作者：
Iain S. Cade;M. Sahinkaya;C. Burrows;P. Keogh
中科院分区：
文献类型：
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作者：
Iain S. Cade;M. Sahinkaya;C. Burrows;P. Keogh
辅助轴承用于防止主动磁轴承系统中的转子/定子接触。它们是对转子位移提供物理限制的牺牲部件。在转子/辅助轴承接触期间，可能会产生垂直于接触区域的显著力。此外，转子滑移和摩擦可导致局部摩擦加热。线性控制策略也可能由于接触期间转子动力学特性的变化而变得无效或引起不稳定。这项工作认为，在磁轴承系统中使用主动控制辅助轴承的概念。辅助轴承控制器设计的重点是衰减轴承振动所造成的接触和减少接触力。控制器优化是基于H-无穷范数与适当的加权函数施加到误差和控制信号。使用模拟转子/磁轴承系统的控制器进行评估。主动控制辅助轴承的性能与弹性安装辅助轴承的性能进行了比较。转子跌落试验，反复接触试验，和突然转子不平衡导致的捕获接触模式，弧考虑。
Auxiliary bearings are used to prevent rotor/stator contact in active magnetic bearing systems. They are sacrificial components providing a physical limit on the rotor displacement. During rotor/auxiliary bearing contact significant forces normal to the contact zone may occur. Furthermore, rotor slip and rub can lead to localized frictional heating. Linear control strategies may also become ineffective or induce instability due to changes in rotordynamic characteristics during contact periods. This work considers the concept of using actively controlled auxiliary bearings in magnetic bearing systems. Auxiliary bearing controller design is focused on attenuating bearing vibration resulting from contact and reducing the contact forces. Controller optimization is based on the H-infinity norm with appropriate weighting functions applied to the error and control signals. The controller is assessed using a simulated rotor/magnetic bearing system. Comparison of the performance of an actively controlled auxiliary bearing is made with that of a resiliently mounted auxiliary bearing. Rotor drop tests, repeated contact tests, and sudden rotor unbalance resulting in trapped contact modes, arc considered.