基于延迟LMS算法的管道噪声有源控制实验研究

在自适应有源控制中，次级通路建模对控制器算法实现有着重要的影响。以往次级通路建模通常会使用带有数十个甚至上百个系数的FIR滤波器，但过多的参数运算会对系统稳定性、控制实时性及硬件复杂度等方面带来麻烦。研究了一种在工程中实现简便的次级通路建模方法——通路时延估计法，并在消声室内进行了管道噪声有源控制实验。实验结果表明，次级通路时延影响着管道噪声有源控制的降噪频率以及降噪带宽。

Experimental Studies on Active Duct Noise Control Based on the Delayed-LMS Algorithm

In conventional ANC (Active Noise Control), the secondary path is usually modeled by an FIR filter with many coefficients, which is not easy to the realization and application of ANC. In this study, based on the hypothesis of that the secondary path can be represented by a delay in such cases, the secondary path is modeled and the experimental research of active duct noise control, based on the DLMS algorithm, is accomplished. It is shown that the delay of secondary path influences not only the frequency but also the bandwidth of active duct noise control.