一种在线建模信号分段调控的有源噪声控制算法

An Active Noise Control Algorithm Based on Segmented Regulation for Online Modeling Signal

在前馈有源噪声控制系统中,在线建模模块需附加建模信号,当控制系统接近收敛时,建模信号的存在会导致系统降噪性能变差。针对此问题,提出一种在线建模信号按能量进行分段调控的算法,改进了建模滤波器的更新方式。针对变压器噪声源,不同算法的仿真对比分析结果表明,改进算法对宽带低频信号有更好的控制效果,不仅提升了系统降噪量,也加快了建模误差的收敛速度。

In the feed-forward active noise control system,the online modeling module requires auxiliary modeling signals.The existence of additional signals will cause the control system to deteriorate in noise reduction when it is close to convergence.In this paper,an algorithm is proposed to adjust the online modeling signal according to the energy,which improves the updating method of the modeling filter.For the noise of transformer,simulation results of different algorithms show that the improved algorithm has better control performance on broadband low frequency noise.It not only increases the noise reduction of the system,but also accelerates the convergence speed of the modeling error.