直升机舱室噪声自适应内模控制模拟试验研究

Experimental Research on Adaptive Internal Model Control Simulation for Helicopter Cabin Noise

为消减直升机舱室噪声 ,对有源消声技术进行了研究。本文采用一封闭空间 ( 72 0 mm× 3 40 mm× 3 40mm)模拟直升机舱室。运用自适应 FIR滤波器来设计内模控制的控制器 ,采用 IIR滤波器模拟误差通道。从而在实验室构造了一套基于自适应内模控制技术的主动消声系统 ( ANC)。实验结果表明 ,对单频及宽带随机信号均有较大的消声量。说明控制系统对舱室噪声有很好的控制效果 ,由于控制器权值在线调整 ,控制系统不仅更有效 ,而且有较好的稳定性和鲁棒性。

To reduce helicopter cabin noise, an active noise control methodology is investigated. An enclosure space (720 mm×340 mm×340 mm) is used to simulate the helicopter cabin. An adaptive FIR filter is adopted as a controller in internal model control process and an IIR filter is used to simulate the error channel. So an active noise cancellation (ANC) system for helicopter cabin noise based on adaptive internal model control technique, is developed in laboratory. Experimental results show that good noise attenuation is achieved for either narrow band or broadband noise. It is found that the control system is effective in cabin noise reduction. As controller weights are updated online, the control system is more effective, robust and stable.