采用压电陶瓷的飞机座舱辐射噪声主动控制

Active Radiation Noise Control of Airplane's Cabin Using Piezoelectric Elements

飞机在飞行过程中受到的各种扰动(如交变气动力的作用),会诱发座舱结构的振动,从而向座舱内辐射噪声。针对这一情况,本文研究了通过使用压电智能材料控制座舱某些结构振动从而抑制其辐射噪声的主动结构声控制方法。制作了座舱模型,根据模型试验,确定了功能元件的布置位置,利用计算机和高速数据采集卡组成的控制系统进行了控制试验,试验结果表明,该系统对座舱结构的振动和辐射噪声都有明显控制效果。

The disturbances of an aircraft while flying make the cockpit structure vibrate, which leads to radiation noises to the pilot. To reduce them, a control method employing piezo electric element using smart material concept is explored, in which the structural noises are reduced through controlling the vibration of the cabin structures. A cabin model is fabricated. By analysis of the model,the optimal location of the functional elements on the model are determined and experimerts are carried out for structural noise suppression using a computer and a data acquisition card as the controller.The results show good reduction of the model' s vibrations as well as noises when it is excited by both single frequency sin and band limited random noise signals.