Robust Design of Active Vehicle Interior Noise Control System Based on Adaptive Notch Filter

摘要

As an effective means of suppressing low-frequency noise from engine, the technology of active noise reduction has a wide application in the field of passenger cars with increasing command for comfort, while the variability of driving conditions and the complexity of acoustic environment in the passenger compartment raise a high requirement on the robustness of the ANC system. The results in this research could be summarized as follows: 1. The coefficient factor a established in this paper could indicate the convergence of the system, and the size of coefficient factor could describe the convergence speed. 2. The system diverged in several frequency ranges when there was modelling mismatch in secondary path, which means the system was not robust to the changes in the states of windows' opening and closing. 3. The convergence coefficient in the adaptive algorithm and characteristic of the secondary path could be considered at the same time in the robust design using a vector c. And the addition of penalty term allowed divergence to be taken into account when looking for the optimal design variables. And through simulation and experiment, the robust design in this research was proven to be effective.