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Vibrational Behavior of High Aspect Ratio Multiactuator Panels

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Multiactuator Panels (MAPs) consist of a flat panel of a light and stiff material to which a number of mechanical exciters are attached, creating bending waves that are then radiated as sound fields. MAPs can substitute the traditional dynamic loudspeaker arrays for Wave Field Synthesis (WFS) with added benefits, such as the low visual profile or omnidirectional radiation. However, the exciter interaction with the panel, the panel material and the panel edge boundary conditions are some of the critical points that need to be evaluated and improved. In this paper, the structural acoustic behavior of a high aspect ratio MAP is analyzed for two classical edge boundary conditions: free and clamped. For that purpose, the surface velocity over the whole area of the MAP prototype has been measured with a Laser Doppler Vibrometer (LDV), which helped in understanding the sound-generating behavior of the panel.

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