Active control of sound transmission through a stiffened panel using a hybrid control strategy

作     者：Ming Yuan Hongli Ji Jinhao Qiu Tianbing Ma 

作者机构：State Key Laboratory of Mechanics and Control of Mechanical Structures Institute of Smart Materials and Structures College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu China 

出 版 物：《Journal of Intelligent Material Systems and Structures》 

年 卷 期：2012年第23卷第7期

页      面：791 - 803页

学科分类：08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：sound transmission active control stiffened panel high-authority control/low-authority control hybrid control 

摘      要：This article presents active control laws for sound transmission through a stiffened panel in the low-frequency range. A stiffened panel mounted on a metallic box is used to simulate aircraft fuselage and cabin system. A loudspeaker located outside the box is driven by band-limited white noise to exert acoustic excitation. Dynamic properties of the stiffened panel are characterized through a series of modal testing. Sound isolation performance is evaluated both analytically and experimentally for further efficient control algorithms design. Based on the analysis of these results, a hybrid control strategy combining both feedback and feedforward control is proposed, which utilizes a high-authority/low-authority control architecture. The low-authority control loop is positive position feedback control and high-authority control loop is filtered-X control. When positive position feedback is implemented, active damping is added on the secondary path, which makes filtered-X least mean square more robust, accelerates convergence rates, and reduces residue errors. In the end, the effectiveness of the hybrid control is verified through a serious of closed-loop control experiments. These results demonstrate that sound pressure level could be lowered by a maximum of 15.9 dB at the first resonance frequency. In addition, the overall sound reduction in the cabin is more than 7 dB.