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Prediction of underwater array performance from in‐air measurements
Journal article   Peer reviewed

Prediction of underwater array performance from in‐air measurements

Mark E. Schafer and W. Jack Hughes
The Journal of the Acoustical Society of America, v 71(S1), pp S109-S110
Apr 1982
DOI: https://doi.org/10.1121/1.2019206

Abstract

A technique has been developed which accurately predicts the performance of underwater acoustic arrays prior to array construction. The method is based upon the measurement of lumped‐parameter equivalent circuit values for each element in the array, using a procedure discussed in an accompanying paper. To test the prediction technique, the equivalent circuit values for a group of Tonpilz‐type transducer elements were measured. From these values, the response of the elements could be predicted for any acoustic loading. Based on the predictions, a selection scheme was developed which minimized the effects of inter‐element variability on array performance. Analysis of predicted beam patterns showed that the array designed by the selection method would have better sidelobe response than an array of the same elements, randomly selected. The measured transmitting and receiving characteristics of a test array, built using the selected elements, were compared to predictions made before the array was built. Results indicate that the technique is accurate over a wide frequency range and also indicate the necessity of including mutual impedance effects in the prediction process.

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