摘要
进行有源噪声控制系统仿真时,为减少次级通路传递函数估计的失配,提出了基于电力声类比线路法的次级声源建模方法,并以滤波-X LMS算法为例,对采用该次级声源模型的控制系统收敛范围和降噪效果进行了研究。结果表明,该次级声源模型与通常的理想模型在幅值和相位两方面都存在较大差别,该次级声源模型系统的降噪效果远低于理想模型系统,同时低频收敛范围增大,高频收敛范围减小。该模型的建立为深入开展有源噪声控制系统仿真研究提供了一种新的次级声源建模方法。
A method of secondary source modeling based on analogue circuits of electrical, me- chanical and acoustical systems was provided in order to reduce the mismatch of transfer function estimation of secondary path in simulation of an active noise control system. The convergence range and noise reduction performance of the system using Filtered--X LMS algorithm were investigated. The results show that such a secondary source model has different amplitudes and phases from the ideal model, which makes the noise reduction performance of control system be much worse than the one with ideal model. Meantime, the convergence range of the control system is increased at low frequencies while decreased at high frequencies. The proposed model can provide a new method of secondary source modeling for further research on the simulation of active noise control systems.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2011年第23期2802-2805,共4页
China Mechanical Engineering
基金
湖南大学汽车车身先进设计制造国家重点实验室自主研究课题(60870002)
关键词
有源噪声控制
次级声源
电力声类比线路
滤波-X
LMS算法
active noise control
secondary source
analogue circuits of electrical, mechanical and acoustical systems
algorithm of Filtered--X LMS
