ACTIVE CONTROL OF VEHICLE INTERIOR ROAD NOISE USING NFXLMS ALGORITHM WITH TWO LOUDSPEAKERS

摘要

It is considered that the highly dependency for operating conditions of traditional time-domain fil-tered-x least mean square (FXLMS) algorithm in the active vehicle interior road noise control system. This paper establishes a multi-channel active road noise control (ARNC) system based on normalized filtered-x least mean square (NFXLMS) algorithm to improve the adaptability of ARNC system to operating conditions. Firstly, the mathematical model of the multi-channel ARNC system based on NFXLMS algorithm is established by theoretical derivation. Furthermore, the computational complexity of the algorithm is derived and compares with the traditional time domain FXLMS algorithm. Secondly, the simulation model, which consists of 4 reference signals, 2 loudspeakers and 1 microphone, based on FXLMS and NFXLMS algorithms is established respectively. The condition adaptability and noise reduction effect of the two systems is compared by offline simulation. Finally, a hardware-in-the-loop (HIL) test platform of the two systems based on MicrAutoBox is built, and the on road test is carried out.