【Title】Research and experiments of mutual radiation impedance effect on array directivity

【Author】LI Daojiang CHEN Hang NI Yunlu (College of Marine,Northwestern Polytechnical University Xl’an 710072)

【Abstract】The mutual radiation impedance ignored in conventional array directivity formula is introduced into the calculation of array radiation sound field,and a modified array directivity formula considering the mutual radiation impedance is gained according to the superposition principle.Results of computer simulation and experiments for a uniform linear array and a uniform planar array show superior performance on the present of the practical directivity pattern of the modified formula in this paper in comparison to the conventional one.