复杂输入下变步长算法的改进及其应用

针对变步长算法的选取对自适应滤波器的性能有重大影响,而复杂输入下谐波对自适应滤波器的误差信号及步长有较大影响的问题,在常用变步长算法的基础上,提出了一种改进变步长算法.该算法根据调节过程调整原算法的系数,实现在调整初期具有较大的步长,而在调整后期具有足够小的步长,以获得较好的滤波效果.仿真分析和实例分析均表明:采用基于改进变步长算法的自适应滤波器进行变频调速下转子断条故障诊断,具有较高的可靠性.

Improvement of variable step size algorithm under complex input and its application

The variable step size algorithm affects the performance of the adaptive filter heavily,and the harmonic in complex input severely affects error and step size of the adaptive filter. To solve these problems,an improved variable step size algorithm is put forward based on common variable step size algorithm. In order to obtain a good filtering effect,the improved algorithm gets a bigger step size in the initial adjustment and a small enough step size in the later adjustment by adjusting the coefficient of the original algorithm. The simulated analysis and the example analysis show that the fault diagnosis of the broken rotor bar in the variable frequency speed regulation has high reliability by using the adaptive filter based on the improved variable step size algorithm.