A modified method is proposed for acoustic array directivity calculation. In this method, a series of solution for
mutual radiation impedance between array elements has been obtained, the radiation sound field of the array is modified
considering mutual radiation impedance, and a new formulation for array directivity calculation is derived from that
modification. Simulation examples show that there are notable differences between cases of considering and ignoring the
mutual radiation impedance in array directivity calculation. The consideration of mutual impedance effects is necessary
in acoustic array directivity calculation.
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