Active micro-vibration control based on improved variable step size LMS algorithm

The contradiction of variable step size least mean square ( LMS) algorithm between fast conver-gence speed and small steady-state error has always existed.So,a new algorithm based on the com-bination of logarithmic and symbolic function and step size factor is proposed.It establishes a new updating method of step factor that is related to step factor and error signal.This work makes an analysis from 3 aspects: theoretical analysis,theoretical verification and specific experiments.The experimental results show that the proposed algorithm is superior to other variable step size algo-rithms in convergence speed and steady-state error.