军用运输机机舱有源消声实验系统的设计与实现

为验证有源消声技术在军用运输机机舱低频噪声消除方面的有效性,设计和实现了一套机舱有源消声实验系统。采用“激振器+舱壁板”方式实现了飞机螺旋桨对机舱诱导噪声的声源模拟,设计了基于前馈控制结构的自适应有源噪声控制系统,构建了基于FX-LMS算法的自适应消声控制器,采用监测麦克风组对舱内空间的消声效果进行监测。实验结果验证了自适应有源噪声控制技术在军用飞机舱室消声降噪领域的有效性,并表明初、次级声源间距对自适应有源消声系统的消声效果具有重要的影响。

Design and Realization of an Experimental Active Noise Control System in Cabin of Military Transporter

In order to test the validity of active noise control technique in the area of cabin noise reduction of military transporter, an experimental active noise control system is designed and realized in the paper. Method of shaker plus fuselage panel is adopted to simulate the inner induced noise of the cabin caused by propeller. An adaptive active noise control system based on fore-feed structure is designed to build the system, in which the FX-LMS algorithm is introduced in design of the controller. A set of monitoring microphones are used to monitor the effect of noise reduction. The experimental target is well reached according to experimental results. It also shows that space between primary and secondary loudspeakers has an important influence on the effect of noise reduction.