Directive near-field measurement data processing method for round-face piston radiator

Abstract

The invention discloses a directive near-field measurement data processing method for a round-face piston radiator. The method comprises the following steps: 1, obtaining complex sound pressure data of a measurement plane through a linear array formed by a hydrophone, wherein the measurement plane passes through a near-field region of the round-face piston radiator and is perpendicular to a sound axis direction; 2, enabling the hydrophone to move a delta d distance in the sound axis direction, and obtaining the complex sound pressure data of the measurement plane which is the delta d distance far; 3, obtaining a mass point vibrating speed of a secondary sound source through the complex sound pressure data obtained at step 1 and 2 and finite difference; 4, obtaining the sound pressure of a given point in an external sound field of the measurement plane. The method is simple in data processing, is easy to implement, is small in amount of measurement data, is high in measurement efficiency, and is simple in measurement structure.

Description

technical field [0001] The invention belongs to the field of acoustic parameter measurement of high-frequency transducers, and in particular relates to a method for processing near-field directivity measurement data of a circular piston radiator. Background technique [0002] Directivity is one of the important characteristics of the far field of the transducer. The conventional method of measuring the directivity of the transducer is to measure in the far field. Since the 1980s, various near-field measurement methods have appeared one after another. The basic principle is The holographic sound pressure data of the sound field is measured in the Fresnel zone of the near field, and the far field of the sound source is reconstructed by using the sound field transformation technology. [0003] The current near-field measurement technology needs to measure the complex sound pressure data on a local finite large plane in the near-field. In order to reduce the influence of the rec...

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Problems solved by technology

The near-field measurement of any sound source can be carried out by the method of mechanical movement measurement, but the accuracy of scanning positioning is high, and the scanning positioning mechanism needs to perform three-dimensional movement, and the structure is relatively complicated; multiple small sensors form a spherical matrix to perform The measurement method requires more sensors, and the array composed of multiple sensors will affect the sound field and reduce the measurement accuracy

The circular piston radiator is a relatively common underwater acoustic transducer, and its radiated sound field is axisymmetric. Therefore, the sound field distribution of a measurement surface can be obtained by measuring the sound field on a line perpendicular to the direction of the sound axis during measurement. Although the measurement method of Wang Shiquan and others can only measure the sound field on a line perpendicular to the direction of the sound axis, the patent does not give a specific data processing method

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