Piezoelectric underwater sound transducer acoustic radiation mode measurement method and system

Abstract

The invention provides a piezoelectric underwater sound transducer acoustic radiation mode measurement method and system based on combination near-field acoustical holography. In the method, the combination near-field acoustical holography is utilized to reestablish sound field, sound pressure and radiation surface vibration velocity; on the basis of an acoustic radiation operator matrix obtained based on measurement data and with the sound field radiation theory being combined, the acoustic radiation power of a piezoelectric underwater sound transducer is expressed to be a positive definite quadric form; and positive definite and conjugate performance of the matrix are utilized to obtained an acoustic radiation mode of the structure. The system comprises a glass water tank, an industrial control computer with PXI bus, a transducer excitation module based on the PXI bus, a sound pressure and vibration velocity acquisition module and a three-dimensional motion platform. The method and system in the invention break the limitation that acoustic radiation mode in the current complex underwater structure can only be solved numerically, provide a new idea for research on the piezoelectric underwater sound transducer, and also provide basis for structure optimization of the piezoelectric underwater sound transducer.

Description

Technical field [0001] The invention belongs to the technical field of piezoelectric underwater acoustic transducers, and specifically relates to a method and system for measuring acoustic radiation modes of piezoelectric underwater acoustic transducers. Background technique [0002] With the implementation of my country’s marine strategy, under the background of increasingly fierce technological competition in the exploration and development of marine resources and the continuous spread of military confrontations around marine resources, underwater acoustic transducers with low-frequency, high-power, deep-water, and small-size characteristics have become more important. The cornerstone of sonar technology has received more and more attention. The traditional structure of the hydroacoustic transducer is limited by design theory, and it is difficult to achieve the above technical indicators. For this reason, the hydroacoustic transducer based on new mechanism, new material and new ...

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Problems solved by technology

[0004] However, the research on acoustic radiation modes has just started, and theoretical research is limited to structures with simple and regular shapes. For simple two-dimensional structures or three-dimensional symmetrical structures, the acoustic radiation modes can be obtained using analytical methods; for the radiation of three-dimensional space structures The sound field needs to be solved by means of numerical methods such as finite element and boundary element, and the theoretical research on the sound radiation mode is more cumbersome; so far, the measurement of the sound radiation mode of the underwater acoustic piezoelectric transducer is still blank.

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