一类多频线谱激励下的主动隔振控制方法

  目的  针对振动控制中多频激励的传统自适应滤波算法控制效果不佳，以及工程中传感器不易安装和通道耦合等原因导致参考信号失配的问题，提出一种反馈式多线谱控制算法。  方法  首先，使误差信号通过级联自适应陷波器，并根据自适应算法更新陷波器参数来估计多个信号频率；然后，合成各参考信号，对相位进行补偿，通过Hilbert变换得到另一路参考信号； 最后，进入并行控制器完成幅值更新，实现振动控制。
  结果  仿真和试验结果表明，该算法能够精确估计频率信息，合成可靠参考信号，对30，37，60和110 Hz线谱均取得了20~40 dB能量衰减。  结论  该算法较好地解决了振动控制中参考信号失配和多线谱振动的问题，有效减弱和抑制了低频振动能量传递。

An active vibration isolation control method under excitation of multi-line spectra

  Objectives  Aiming at the poor control effect of the traditional adaptive filtering algorithm for multi-frequency excitation in vibration control, and the engineering problems of difficult sensor installation and channel coupling that cause reference signal mismatch, this paper proposes a feedback multi-line spectrum control algorithm.  Methods  First, the error signal is passed through the cascaded adaptive notch filter, and the notch filter parameters are updated according to the adaptive algorithm to estimate multiple signal frequencies. Next, each reference signal is synthesized and phase compensation performed, then another reference signal is obtained through Hilbert transform and the parallel controller is finally entered to complete the amplitude update and realize vibration control.
  Results  Through simulation and experimental verification, the results show that the proposed algorithm can accurately estimate frequency information, synthesize reliable reference signals and achieve 20–40 dB energy attenuation for 30, 37, 60 and 110 Hz line spectrums.  Conclusions  This algorithm provides a better solution to the problems of reference signal mismatch and multi-line spectrum vibration in vibration control, and effectively reduces and suppresses low-frequency vibration energy transmission.