Aiming at the problem that passive control of low frequency noise in the cab of excavator is not ideal

active noise control is introduced.In order to solve contradiction between convergence speed and steady-state error

on the basis of normalization function and arctangent function

an improved variable step size normalized FxLMS algorithm（VSSFxNLMS）is proposed.Through simulation analysis and noise reduction experiments in cab of excavator

the noise reduction amount and convergence speed of VSSFxNLMS algorithm

the normalized FxLMS algorithm（FxNLMS）and the variable step size FxLMS algorithm（VSSFxLMS）are compared.The results show that the simulated noise reduction amount of the VSSFxNLMS algorithm is increased by 1.29 % and 4.38 %

respectively

the experimental noise reduction amount is increased by 1.02 % and 2.42 %

and the convergence speed is increased by 40 % and 10 %

respectively.