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Single vector hydrophone based measurement method for acoustic reflection coefficient of large-sample underwater acoustic material

A technology of vector hydrophones and underwater acoustic materials, applied to vibration measurement in fluids, using sound waves/ultrasonic waves/infrasonic waves for material analysis, and measuring vibrations and other directions, achieving fewer test steps, convenient and quick data processing, and eliminating the need for measurement systems Effect

Active Publication Date: 2018-12-14
HARBIN ENG UNIV
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Problems solved by technology

This method is sensitive to the distance from the vector hydrophone to the sample, and is easily affected by the phase inconsistency between the sound pressure of the vector hydrophone and the particle velocity

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  • Single vector hydrophone based measurement method for acoustic reflection coefficient of large-sample underwater acoustic material
  • Single vector hydrophone based measurement method for acoustic reflection coefficient of large-sample underwater acoustic material
  • Single vector hydrophone based measurement method for acoustic reflection coefficient of large-sample underwater acoustic material

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Embodiment Construction

[0016] The following examples describe the present invention in more detail.

[0017] The schematic diagram of the acoustic reflection coefficient measurement model for single-vector hydrophone signal subspace decomposition is shown in figure 1 Shown, concrete technical scheme of the present invention is as follows:

[0018] The first step is to eliminate the diffraction sound at the edge of the sample: firstly, the sample to be tested, the transmitting transducer and the vector hydrophone are placed in the anechoic pool at the same depth, and the broadband pulse sound signal is emitted. The signal received by the vector hydrophone is the direct wave signal, reflected wave signal, sample edge diffracted wave signal, etc. transmitted by the transmitting transducer. First, the interference such as the edge diffracted wave signal of the sample to be tested is removed in time, and the direct wave signal and reflected wave signal are obtained. mixed signals.

[0019] The measurem...

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Abstract

The invention provides a single vector hydrophone based measurement method for acoustic reflection coefficient of a large-sample underwater acoustic material. The method mainly comprises the followingsteps: (1) eliminating diffraction sound at the edge of a sample; (2) constructing a signal processing model; (3) separating direct sound from reflected sound; (4) obtaining the acoustic reflection coefficient. On the one hand, broadband narrow pulse is adopted as a form of a transmission signal, time-frequency characteristics of the signal are easy to control, the diffraction sound at the edge of the sample can be separated in time, and the influence of the diffraction sound can be avoided; on the other hand, a single vector hydrophone is regarded as a three-element receiving array, and an array signal processing algorithm of subspace decomposition is adopted for processing measurement data, data processing is convenient and fast, and better real-time property is achieved; besides, a conventional sound source and a vector hydrophone are used as core components of measurement, a traditional large-scale transmitting and receiving matrix is not needed, a huge and complicated measurementsystem is saved, few test steps are taken, and the acoustic reflection coefficient of a concerned frequency band can be obtained by one transmission, so that measurement efficiency is effectively improved.

Description

technical field [0001] The invention relates to a method for measuring the acoustic reflection coefficient of underwater acoustic materials, in particular to a method for measuring the acoustic reflection coefficient of large-sample underwater acoustic materials in a large-scale anechoic pool based on the subspace decomposition of single-vector hydrophone signals. Measurement methods. Background technique [0002] At present, most of the conventional methods for measuring the acoustic reflection coefficient of underwater acoustic materials use the sound pressure hydrophone as the core equipment for measurement, and use the sound pressure hydrophone to obtain the sound pressure field information in the test space to obtain the acoustic reflection coefficient of the sample to be tested. Common sound pressure measurement methods can be roughly divided into laboratory sound tube method, reverberation chamber method and free field measurement method according to different test sp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01H3/00
CPCG01H3/00G01N29/046
Inventor 时胜国王超杨德森胡博张昊阳时洁洪连进李松莫世奇方尔正朱中锐张揽月李思纯
Owner HARBIN ENG UNIV
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