Measurement of underwater transfer functions using spatial average and reciprocity principle

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (3) : 151-155.

CHENG Guo, CHEN Jingbing, HE Lin

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Abstract

The measurement method of reciprocity transfer functions of diffuse sound fields in anomalous reverberant sound fields was proposed. Through reversing actuating points and measuring points in reciprocity measurement, the problems of direct-actuating measurements, such as narrow spaces and friable structures were avoided. Based on the spatial average method, the underwater radiated noise transfer functions of diffuse sound fields were obtained in reverberant sound fields. These transfer functions and the pseudo-force method were used to evaluate the radiated noise of underwater structures. This theory was validated with numerical simulations and a lake test. The results of simulations and tests showed that the proposed method can be applied in complex underwater structures to eliminate the influences of anomalous reverberant sound fields. The resalts provided a reference for further studying the reciprocity principle and the spatial average method.

Key words

transfer function / reciprocity principle / spatial average / reverberant field / underwater measurement

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CHENG Guo, CHEN Jingbing, HE Lin. Measurement of underwater transfer functions using spatial average and reciprocity principle[J]. Journal of Vibration and Shock, 2017, 36(3): 151-155

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