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Test system for identifying and separating a hydrodynamic noise source and construction method thereof

A test system and hydrodynamic technology, applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems that the control measures are not targeted, affect the location and analysis of the actual ship's hydrodynamic noise source, and achieve structural The effect of simplicity, high reliability and high technology maturity

Pending Publication Date: 2019-03-29
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology

However, for the main noise source at medium and high speeds - hydrodynamic noise, since the noise received by the hydrophone is the result of the joint action of fluid direct sound and flow-induced structure noise, it is impossible to further determine whether it comes from fluid direct sound. It is still flow-induced structural noise, which affects the further location and analysis of the actual ship's hydrodynamic noise source, resulting in less targeted control measures

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  • Test system for identifying and separating a hydrodynamic noise source and construction method thereof
  • Test system for identifying and separating a hydrodynamic noise source and construction method thereof

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Embodiment Construction

[0023] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0024] The specific noise source identification and separation of the present invention adopts the method of coherence analysis. Coherent analysis is applicable to the multi-input single-output model, which mainly analyzes the relationship between each input source and the output noise spectrum, and determines the influence of each noise source on the characteristic frequency of the output. The coherence analysis is based on the coherence function. The coherence function is a frequency domain function that indicates the internal relationship between the two functions and distinguishes the degree of correlation between the discrete components of the two signals. The size of the coherence function indicates that the output energy comes from each noise source signal energy ratio. The larger the coherence coefficient, the stronger the correlation between the ...

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Abstract

The invention provides a test system for identifying and separating a hydrodynamic noise source which can identify two noise sources such as fluid direct noise and fluid induced structure noise causing hydrodynamic noise of a ship and can separate the contributions of the two noise sources. The system integrates a hydrophone, a vibration sensor and a pulsating pressure sensor in set in the hydrodynamic noise region of a hull, and performs correlation calculation analysis of the coupling noise measured by the hydrophone and signals measured by the vibration sensor and the pulsating pressure sensor to achieve identification and separation of the fluid direct noise and fluid induced structure noise in the hydrodynamic noise. The test system is simple in structure, convenient to install, low in cost and high in technical maturity and can be widely applied to ships such as surface ships and underwater submarines. The test system is simple in structure, easy to implement, high in reliability, convenient to install and use and high in environmental adaptability.

Description

technical field [0001] The invention belongs to the technical field of noise source identification and separation, and in particular relates to a test system for identification and separation of hydrodynamic noise sources and a construction method thereof, which is suitable for identifying and analyzing the direct fluid sound and flow-induced noise in the hydrodynamic noise of ships. separate. Background technique [0002] Hydrodynamic noise is one of the three major noise sources when ships sail underwater, and it will increase significantly at medium and high speeds, becoming the main source of noise for ships. The generation mechanism of hydrodynamic noise is: when the ship sails underwater, there are random pulsating pressures in the turbulent boundary layer on the surface of the hull. , that is, current-induced noise. [0003] According to the above mechanism, the hydrodynamic noise f 0 Divided into two parts, namely f 0 = f 1 + f 2 , where f 1 represents the noi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 汪利刘宏邓海华张瀚钦孙新占
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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