A New Hybrid Active Noise Control System: Adaptive Plant Disturbance Canceling Structure Combined with Narrowband Adaptive Noise Canceling Structure

摘要

Hybrid control technique using feedforward and feedback control methods have been proved to be an effective way for active noise control (ANC) systems. The main problem is that the feedback loop often brings unstable of the system. Traditional feedback control tragedy, such as robust control, mainly focus on system stability and loss a lot of system performance by making some trade-off among the control parameters. In this investigation, we propose a new hybrid ANC system to cope with this problem. It consists of a conventional narrowband feedforward adaptive active noise canceling and an adaptive plant disturbance canceller based on inverse modeling technique. A simulation system is developed with the MATLAB/Simulink dynamic system analysis tools for evaluating the performance of the new hybrid control system. Simulation test is carried out using measured noise signals from a motorcycle engine exhaust. The results show that it can achieve a remarkable noise reduction across the entire frequency band. Another important feature of this new hybrid system is that it can effectively eliminate the "disturbances" that including the unconcealed part of the primary noise, the sensor noise, and the disturbances intruding from the environments.