Experiments on a smart double panel for the active control of sound transmission

Alujevic, N., Gardonio, P. and Frampton, K.D. (2008) Experiments on a smart double panel for the active control of sound transmission. International Conference on Noise & Vibration Engineering (ISMA), Leuven, Belgium. 14 - 16 Sep 2008.

Abstract

This paper presents an experimental 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 are chosen so as to approximate a section of aircraft fuselage skin. Active vibration control is implemented on the double panel using nine direct velocity feedback loops. Miniature voice coil actuators that react between the two panels with collocated Micro Electro Mechanical Systems (MEMS) accelerometer sensors are used. The study involved two types of experiments. First, the sensor-actuator frequency response function of a control unit was measured with reference to different input/output signal conditioners using two types of accelerometer sensors. The Nyquist stability criterion was then used to determine the configuration which guarantees the best stability properties of a single control unit. Second, the sound power radiated by the double panel excited by a point force at the source side was measured in the anechoic chamber with and without active control. The performance of the active control was then assessed in terms of the reductions in the radiated sound power. The reductions in the radiated sound power are compared to passive reductions produced by a sound absorbing foam attached to the source panel.

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