Method of Constructing Virtual Reference Signals Utilizing Grouping for Active Road Noise Control in Vehicles

Abstract:

Aimed at the problem that the large number of reference signals for the road noise active control system leads to a heavy computational burden， and the directly constructed virtual reference signals are not highly coherent with the target noise in the vehicle， a method for constructing virtual reference signals utilizing grouping is proposed. First， the vehicle road test is conducted， the vibration acceleration signals collected near the four- wheel positions are selected as the original signals， and the number of virtual reference signals is determined based on the singular value analysis. Then， the original signals with high correlations are divided into a group based on the wheel position， the conversion matrix is constructed by the singular value decomposition for each group of original signals， and the virtual reference signals are constructed utilizing grouping. Finally， a road noise active control model based on the normalized filtered-x least mean square （NFXLMS） algorithm is built to analyze the performance of the virtual reference signals constructed utilizing group in reducing computational complexity and noise reduction. Compared with the original virtual reference signal construction method， this method has greatly reduced the computation complexity and improved the noise reduction effect， which verifies the effectiveness of the method.

Key words:active road noise control;virtual reference signal;computation complexity;monstruction method ultilizing grouping