Abstract
Expressions of self and mutual impedance of pistons in an infinite, rigid, plane baffle are well known. The array is coated with an elastic rubber skin. Plane‐wave decomposition of the compression and shear potentials is performed in the skin as well as the fluid. Expressions are given for the nearfield pressure and for the displacement field in the skin. This pressure is then integrated over the pistons to obtain expressions of self and mutual radiation impedance, which is referred to as average surface velocity. Results are presented for linear (2‐D case) and circular (3‐D case) radiators in terms of kd (dimensionless product of the wavenumber and the distance between pistons). The other parameters are thickness and elastic characteristics of the skin and the dimension of the piston. As a post processing, the three‐dimensional directivity diagram for the whole array can be easily obtained through the plane‐wave decomposition in the fluid.
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