Abstract
Reduction of sound power from a vibrating panel was achieved by reducing the panel vibration amplitude. Experimental tests involving a constrained panel and three active control strategies were performed to actively suppress the panel vibration, namely: signal processing techniques involving cross-correlation; feedback control using proportional and derivative (PD) control; and an ideal inverse operational amplifier method. The results show that PD control methods together with the application of a single point force input of an electromagnetic actuator have great potential for use in controlling the low frequency panel vibration, hence reducing the structure-borne noise. Sound power reduction ranged from 3.0 dB to 9.5 dB and was achieved when the actuator was located at the centre of the panel; 1.7 dB to 6.9 dB was achieved with the actuator located at the top left quadrant of the panel. The panel structural modes derived using a finite element method (FEM) show a strong correlation with the sound power radiation pattern from the surface of the panel and could be used to predict sound sources.
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