Rotor/active magnetic bearing transient control using wavelet predictive moderation
Rotor/active magnetic bearing transient control using wavelet predictive moderation
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DOI：
10.1016/j.jsv.2006.11.005
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发表时间：
2007-04
影响因子：
4.7
通讯作者：
Iain S. Cade;P. Keogh;M. Sahinkaya
中科院分区：
文献类型：
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作者：
Iain S. Cade;P. Keogh;M. Sahinkaya
提出了一种由多输入多输出柔性转子/磁轴承系统瞬态响应预测系统稳态振动幅值的新方法。该技术是基于一个多层次的小波系数分析与内置的瞬态系统动力学。对于非全同小波，从理论上确定了作用于系统的输入扰动小波系数与实测振动小波系数之间的关系。在小波系数域中用位移小波系数的比例反馈得到的控制力来配制控制器。改进的瞬态性能实现了使用小波系数稳态预测，以缓和的控制信号。使用质量损失测试的控制器的实验验证演示了瞬态振动衰减可以实现的方式。
A novel method for predicting the ultimate steady-state vibration amplitudes from measured transient responses in multi-input, multi-output flexible rotor/magnetic bearing systems is presented. The technique is based around a multi-level wavelet coefficient analysis with in-built transient system dynamics. The relation between an input disturbance wavelet coefficient acting on the system and a measured vibration wavelet coefficient is identified theoretically for non-identical wavelets. A controller is formulated in the wavelet coefficient domain with control forces derived from proportional feedback of displacement wavelet coefficients. Improved transient performance is achieved using wavelet coefficient steady-state prediction to moderate the control signal. Experimental validation of the controller using mass-loss tests demonstrates the manner in which transient vibration attenuation may be achieved.