Simulation of active control of engine exhaust noise by variable step tracking

The active control system of pipeline noise of engine exhaust is a time-varying systems, that includes a sub-channel identification. The tracking in time plays an important role, and that is a hardcore of algorithm functions. A new variable step algorithm with leakage was designed (aNFxLMS) by the improving normalized LMS adaptive algorithm, it can be used to tracking bad time-varying systems. Using Matlab mathematical test show that algorithm is reasonable. It was proved a good algorithm, that a simulation of active control system to control noise of engine exhaust was designed through program of Simulink. Therefore, numerical simulation can provide theoretical guidance for real vehicle applications and algorithm testing.