基于自适应陷波器的主动隔振仿真研究

自适应陷波器可以对陷波频率处的信号进行有效衰减，而对其他频率的信号影响较小，因而在有源消声、信号提取等方面得到广泛应用。以与振动干扰同频率的正弦信号作为前馈控制系统的参考输入，采用滤波LMS算法对控制权值进行调整，证明对单频和多频干扰进行主动隔振时系统的结构均等同于自适应陷波器，因而可以对周期性振动进行有效的隔离。仿真结果表明，在振动干扰中存在随机噪声的情况下，所提出的控制方法对于周期性振动仍具有较好的控制效果。

Study on Simulation of AVI Based on Adaptive Notch Filter

The adaptive notch filter can attenuate signals at notch frequencies with little influence on signals at other frequencies. Thus it is widely used in active noise control and signal pick-up. Based on this property, a novel control method is proposed, in which sinusoidal signals with the same frequency of disturbance signal are used as reference input of the controller, and Fx-LMS algorithm is adopted to adjusted controller weights. It is proved that such control architecture for single or multiple frequencies vibration is equivalent of an adaptive notch filter, which means the proposed method may filter the periodic disturbance. Simulation results show that even if there is random disturbance, the method can also control the periodic vibration disturbance effective.