Adaptive feedback control method for active vibration isolation based on on-line frequencies estimation
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摘要: 针对自适应前馈控制方法的缺点,提出一种周期性振动主动控制的自适应反馈控制方法.利用误差信号恢复振动干扰信号,采用级联陷波器估计信号中周期性分量的频率,并在估计频率处为控制器构造参考信号;控制器的参数则根据Lyapunov稳定性原理进行调整.仿真和主动隔振试验结果表明:频率估计方法在不同信噪比情况下均具有较好的估计精度;主动控制方法在振动频率处的隔振效果明显,隔振量可达16 dB以上,且控制器的参数收敛速度较快.
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关键词:
- 主动隔振 /
- 自适应反馈控制 /
- 频率估计 /
- Lyapunov稳定性
Abstract: As the adaptive feedforward control method used for active control of periodic vibration has many shortcomings, an adaptive feedback control method was proposed based on on-line frequency estimation. The vibration disturbance was recovered with the error signal, and the frequencies of periodic components in disturbance were estimated using cascaded adaptive notch filters, whose parameters were adjusted with recursive least mean algorithm(RLS). Reference signals were produced at the estimated frequencies as controller inputs, and controller weights were adjusted based on Lyapunov stability theory. Simulation and experimental results show the frequency estimation method has good estimation accuracy, the adaptive feedback control method can gain over 16 dB vibration isolation at the vibration frequency, and the controller parameters adjustment is fast. -
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