Active control of road noise caused by tire cavity-resonance in passenger car based on optimized weights-FxLMS algorithm.

초록

This study proposes a new method for active noise cancellation (ANC) of cavity noise of a tire. A general method for ANC of road noise is to use several accelerometers for acquirement of reference signals. Cavity noise of tire is caused by the resonance of tire cavity mode. Resonance frequencies of tire cavity are determined by the cavity structure of tire. Therefore, harmonic sinusoidal signals related to resonance frequencies can be used for reference signals. However, resonance frequencies could be varied due to small change of tire cavity during driving of a car. For the overcome of this variation, adaptive filter of ANC system was designed and applied to the ANC of a cavity noise. It is called optimized weights filtered-x LMS algorithm (OW-FxLMS). The proposed method did not need accelerometers for the ANC of cavity noise and practically was applied to the ANC of cavity noise of a tire in a car. Tire cavity noise of a test car was attenuated to 3-5 dBA.