A Method for Measuring the Average Radiation Impedance of Hydroacoustic Piezoelectric Transducers in Non-Anechoic Pools

Abstract

The invention discloses a method for measuring the average radiation impedance of an underwater acoustic piezoelectric transducer in a non-nechoic pool. Measure the electric admittance of the hydroacoustic piezoelectric transducer in the air, the electric admittance in the anechoic pool and the electric admittance at N measurement positions in the non-anechoic pool to be tested; determine the hydroacoustic piezoelectric transducer Internal resistance, content and static admittance; determine the mechanical impedance of the transducer; determine the dynamic impedance of the transducer at N measurement positions in the non-anechoic pool to be tested; determine the transducer according to the mechanical impedance and dynamic impedance The average radiation impedance of the transducer in the non-anechoic pool to be tested. The invention can indirectly measure the average radiation impedance of the hydroacoustic piezoelectric transducer in the non-nechoic pool through the measurement of electric admittance, the measuring equipment only needs an impedance analyzer, the measuring method is simple and fast, the testing cost is low, and it has great practicality value.

Description

technical field [0001] The invention relates to a method for measuring the radiation impedance of a sound source, in particular to a method for measuring the average radiation impedance of an underwater acoustic piezoelectric transducer in a non-anechoic pool. Background technique [0002] Compared with anechoic pools and field tests, non-anechoic pools have the advantages of good repeatability, easy to meet measurement conditions, fast and low cost of testing, and the development of reverberation method research has promoted the wide application of non-anechoic pools. The main applications of non-anechoic pools are: transducer calibration, sound source radiated sound power measurement, material large sample sound absorption test, flow noise test, etc. The sound field relationship between different non-anechoic pools and free fields is different. When using non-anechoic pools, it is necessary to perform free-field correction on the sound field of non-anechoic pools through k...

AI Technical Summary

Problems solved by technology

[0003] Piezoelectric transmitting transducer is a commonly used sound source in underwater acoustics. Its radiation impedance is generally measured in an anechoic pool or a free field environment. Due to the complex sound field characteristics in a non-anechoic pool, the The application of is in the research and development stage, so there are few reports on the radiation impedance test of transducers in non-anechoic pools

Patent No. 201210535235.1 provides a method for measuring the mutual radiation impedance of piezoelectric transducer arrays in a non-anechoic pool. It is necessary to measure the resonant frequency of the transducer in the air and in a non-anechoic pool. The piezoelectric transducer may increase the transmission gain through special design or process. The admittance curve measured in the anechoic pool is relatively regular, but the admittance curve measured in the air will have multiple resonance peaks, and the resonance frequency cannot be determined. ; When the transducer is launched in a small-scale non-anechoic pool, due to the interference of the sound field boundary, the radiation impedance of the transducer will change drastically, and the measured admittance curve will increase and the resonance peak cannot be distinguished clearly. Determine the resonant frequency

The traditional method of measuring the radiation impedance of the piezoelectric transducer in the anechoic pool is no longer applicable in the non-anechoic pool, and it has not been seen that only the impedance analyzer is used to quickly measure the average radiation impedance of the piezoelectric transducer in the non-anechoic pool method report

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