基于自适应逆控制的飞机客舱消噪系统

System of Eliminating Airplane Cabin Noise Based on Adaptive Inverse Control

提出了飞机涡轮发动机与螺旋桨引起客舱噪声的消除方法 ,采用自适应逆控制 ,基于X LMS滤波算法构造控制器 ,使之驱动的扬声器输出值对消拾音器附近即乘客头部周围的引擎和螺旋桨噪声 ,从而使乘客座位附近成为一块“无声带”。针对被控对象的扰动问题 ,还加入了对象扰动消除器 ,构成了集成的自适应逆噪声消除系统。实验表明 ,这是一个可靠的鲁棒系统 ,具有很好的消噪性能和抗扰能力 ,其降噪量不小于60dB。

A method is provided to eliminate airplane cabin noise caused by turboes and airscrews. Adaptive inverse control technique employing filtered-X LMS algorithm is adopted to construct a controller. The output of loudhailer driven by the controlller clears up the noise of engine and airscrew around the sound pickup, viz. about the passenger's head, then the place round the passenger's seat becomes noiseless zone. In the light of the disturbance of controlled object, an implement is appended to constitute an integrated adaptive inverse noise clearing system. The system is verified to be robust one which has excellent performance to cancel noise and counteract disturbance. The quantity of noise abatement isn't less than 60 dB.