Here, aiming at time-varying, broadband and random characteristics of vehicle interior structure-borne road noise, the road noise active control system was established based on the normalized filter-x least mean square (NFXLMS) algorithm.Firstly, through theoretical deriving,the multi-channel filter-x least mean square (FXLMS) algorithm and the multi-channel NFXLMS algorithm were established, respectively.The computation complexity analysis showed that the computational increment of NFXLMS algorithm can be negligible.Then, off-line simulation models for the vehicle interior road noise active control system were built with the two algorithmsin Simulink.The off-line simulation using data collected from damaged rough asphalt pavement showed that the road noise activecontrol system based on NFXLMS algorithm has better robustness and working condition adaptability.Finally, a MicroAutoBox was taken as the real-time controller, the hardware-in-loop test platform for the vehicle interior road noise active control system based on NFXLMS algorithm was built, and actual road tests were conducted to verify the effectiveness of the system.
Key words
noise active control /
vehicle interior road noise /
NFXLMS algorithm
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