基于次级通道前馈等效阻尼补偿的改进滤波x-LMS算法

研究了通过次级通道阻尼补偿提高滤波x-最小均方(Least Mean Square; LMS)算法性能的实现方法，提出了一种自适应前馈等效阻尼补偿方案；将前馈补偿器与自适应前馈控制器设计相结合，设计了基于前馈等效阻尼补偿的改进滤波x-LMS算法，改进算法保持了滤波x-LMS算法结构简单、鲁棒性强等优点。以柔性悬臂梁前两阶模态振动为控制目标，分别采用两种算法进行了主动减振仿真实验，结果表明本文提出的改进滤波x-LMS算法具有更快的收敛速度。

An improved filtered x-LMS algorithm based on feedforward damping compensation of secondary path

Feedforward damping compensation method, a realization of damping compensation of secondary path, is studied, and it can be used to improve the performance of filtered x-LMS algorithm. Then, by combining the feedforward compensator and the adaptive feedforward controller, an improved filtered x-LMS algorithm based on feedforward damping compensation is designed. The improved algorithm still holds the virtues of filtered x-LMS algorithm, such as simple structure, excellent robustness, etc. A simulation of active control on a flexible cantilever’s first two modal vibration is carried out, in which standard and improved filtered x-LMS algorithm are respectively used. Simulation results show that the improved algorithm is capable of suppressing the first two modal vibration of cantilever in far less time than standard one.