Smart Double Panel with Decentralized Active Dampers for Sound Transmission Control

This paper presents a theoretical study of decentralized velocity feedback control systems for the reduction of sound transmission through double panels. The system studied consists of two plates which are coupled acoustically by the air in the cavity between them and structurally by four elastic mounts. The geometrical and material properties of the double panel have been chosen so as to approximate a section of an aircraft fuselage skin. The outer panel of the skin (the source panel) is excited by oblique plane waves and the consequent sound power radiated from the inner panel (the radiating panel) is calculated. First, a parametric study of passive sound transmission of double panels with different geometrical and material properties is carried out. Second, active vibration control is implemented using 16 decentralized direct velocity feedback loops. Performance of such a control system is assessed for four control cases. The first two cases deal with skyhook force actuators with collocated velocity sensors, which implement active damping either on the source panel or on the radiating panel. In the third case, skyhook actuators and collocated velocity sensors are located on both panels. Finally, an approach using actuators that react between the two panels with collocated relative velocity sensors is considered.

[1]  Stephen J. Elliott,et al.  Active vibration isolation using an inertial actuator with local displacement feedback control , 2004 .

[2]  Philip A. Nelson,et al.  Active Control of Vibration in Structures , 1996 .

[3]  Jian-Qiao Sun,et al.  LETTER TO THE EDITOR: SOME OBSERVATIONS ON PHYSICAL DUALITY AND COLOCATION OF STRUCTURAL CONTROL SENSORS AND ACTUATORS , 1996 .

[4]  Michael J. Brennan,et al.  Active vibroacoustic control with multiple local feedback loops. , 2002 .

[5]  André Preumont,et al.  Responsive systems for active vibration control , 2002 .

[6]  Stephen J. Elliott,et al.  Signal Processing for Active Control , 2000 .

[7]  Jian-Qiao Sun,et al.  Unconditional Stability Domains of Structural Control Systems Using Dual ACTUATOR-SENSOR Pairs , 1997 .

[8]  M. Balas.  Direct Velocity Feedback Control of Large Space Structures , 1979 .

[9]  Stephen J. Elliott,et al.  Feedback stability limits for active isolation systems with reactive and inertial actuators , 2001 .

[10]  Shiu-keung Tang,et al.  On noise indices for domestic air conditioners , 2004 .

[11]  Stephen J. Elliott,et al.  Model for Active Control of Flow-Induced Noise Transmitted Through Double Partitions , 2002 .

[12]  Benoit Petitjean,et al.  Feedback controllers for active vibration suppression , 1996 .

[13]  Kenneth D. Frampton,et al.  Smart double panel with decentralised active dampers for control of sound transmission , 2007 .

[14]  Paolo Gardonio,et al.  Review of Active Techniques for Aerospace Vibro-Acoustic Control , 2002 .

[15]  Philip A. Nelson,et al.  Active Control of Sound , 1992 .

[16]  Tian Jian Lu,et al.  External Mean Flow Influence on Noise Transmission Through Double-Leaf Aeroelastic Plates , 2009 .

[17]  Stephen J. Elliott,et al.  Modal response of a beam with a sensor–actuator pair for the implementation of velocity feedback control , 2005 .

[18]  A. Preumont.  Vibration Control of Active Structures , 1997 .

[19]  E. E. Ungar,et al.  Structure-borne sound , 1974 .

[20]  Harvey H. Hubbard,et al.  Aeroacoustics of Flight Vehicles: Theory and Practice , 1994 .

[21]  Paolo Gardonio,et al.  Active vibration control using an inertial actuator with internal damping. , 2006, The Journal of the Acoustical Society of America.

[22]  Stephen J. Elliott,et al.  Analysis and measurement of a matched volume velocity sensor and uniform force actuator for active structural acoustic control , 2001 .

[23]  Paolo Gardonio,et al.  Smart panel with multiple decentralized units for the control of sound transmission. Part I: theoretical predictions , 2004 .