| 摘要 |
A marine vessel (1, Fig 1) has on its surface a plurality of tiles 2 applied to it. Each tile has, integral therewith, an integrated circuit 8 which is programmed so as to cause piezo-electric elements 5, 10, at the surface of the tile to modify the dynamic properties of the surface of the vessel. This facility enables turbulence to be reduced, acoustic reflections to be cancelled, escape of noise from the vessel to be eliminated, and acoustic signals to be transmitted as and when necessary. Selected elements act as sensors and others as drivers. The elements may be used on submarines or aircraft.
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