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A device and method for measuring model flow-induced noise in a water tunnel working section

A technology of measuring device and working section, which is applied in the direction of measuring device, measuring ultrasonic wave/sonic wave/infrasonic wave, using electric device, etc., can solve the problem that the acoustic absolute soft pipe is an air boundary and the measurement result is too small, etc.

Active Publication Date: 2020-11-20
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the currently retrieved flow-induced noise measurement methods in pipelines that most of these methods are to insert hydrophones into the pipe wall to examine the noise signals received by the hydrophones ①Zhang Hao, experimental research on centrifugal pump flow noise , Noise and Vibration Control, 2013; ②Xia Ji, Design and Experimental Research of Low-noise Drainage Devices for Pipelines, Ship Science and Technology, 2017, because the acoustic absolute soft pipe where the hydrophone is installed on the pipe wall is not considered The air boundary problem may make the measurement result underestimated, and how to eliminate the "artifact sound" interference caused by turbulent fluctuating pressure has not been addressed

Method used

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  • A device and method for measuring model flow-induced noise in a water tunnel working section
  • A device and method for measuring model flow-induced noise in a water tunnel working section
  • A device and method for measuring model flow-induced noise in a water tunnel working section

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specific Embodiment 1

[0032] As shown in the figure, 1 is the gravity type low-noise water tunnel, 10 is the upper water tank, 11 is the vertical pipe, 12 is the contraction section, 13 is the working section, 14 is the diffusion section, 15 is the drain pipe, and 16 is the reverberation Box, 2 is the bracket, 17 is the upper through hole, 18 is the lower through hole, 19 is the upper fixed end, 20 is the lower fixed end, 3 is the vibration damping pad, 4 is the round cake-shaped air bag, 5 is the pulsation pressure sensor, 6 7 is a signal source, 8 is a power amplifier, and 9 is a spherical sound source.

[0033] A device for measuring model flow-induced noise in the working section of a water tunnel, characterized in that it includes a bracket 2, a vibration-damping pad 3, a circular cake-shaped air bag 4, a pulsation pressure sensor 5, and a hydrophone 6; the bracket is of a thin airfoil structure , the two ends of the support are installed on the pipe wall of the diffusion section of the water ...

specific Embodiment 2

[0043] A device for measuring flow-induced noise of a model in a working section of a water tunnel, comprising a gravity-type low-noise water tunnel 1, a bracket 2, a vibration-damping pad 3, a circular pie-shaped air bag 4, a pulsation pressure sensor 5, and a hydrophone 6;

[0044] The gravity type low-noise water tunnel 1 is composed of an upper water tank 10, a vertical pipe 11, a contraction section 12, a working section 13, a diffusion section 14, a drain pipe 15 and a reverberation box 16. The podium casing that is processed by the ratio is placed in the working section 13; firstly, the water pump is used to inject water into the upper water tank 1, and after reaching a certain water level, the valve of the vertical pipe 11 is opened, and the water is filled with the shrinking section 12. Section 13 and diffusion section 14, by arranging and combining the drain pipes 15 with different apertures, opening the valve controlling the drain pipe 15, the water will flow through...

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Abstract

The invention discloses a device and method for measuring the model flow-induced noise in a working section of a water tunnel, and belongs to the field of optical measurement. The device comprises a gravity-type low-noise water tunnel 1 and a measurement device. The device is characterized in that the gravity-type low-noise water tunnel 1 consists of an upper water tank 10, a straight vertical tube 11, a shrinkage section 12, a working section 13, a diffusion section 14, a water drain pipe 15, and a reverberation box 16; the bottom of the upper water tank 10 is connected with the straight vertical tube 11, and the tail end of the straight vertical tube 11 is sequentially connected with the shrinkage section 12, the working section 13, the diffusion section 14 and the water drain pipe 15; the reverberation box 16 is added to the working section 13; the measurement device comprises a support 2, a damping pad 3, a circular cake-shaped air bag 4, a pulsating pressure sensor 5, a hydrophone6, a signal source 7, a power amplifier 8 and a spherical sound source 9; the signal source 7 emits a single-frequency sine signal, and the single-frequency sine signal passes through the power amplifier 8 to reach the spherical sound source 9; the pulsating pressure sensor 5 and the hydrophone 6 receive the sound signals emitted by the spherical sound source 9.

Description

technical field [0001] The invention belongs to the field of acoustic measurement, in particular to a device and method for measuring model flow-induced noise in a working section of a water tunnel. Background technique [0002] At present, in gravity water tunnels, scaled models such as submarines and torpedoes are often used to study the flow and sound field characteristics of different types of aircraft. In order to eliminate the impact of the flow impact on the hydrophone, a flow-induced noise measurement method with the underwater reverberation method as a typical representative has been developed, which is wrapped in the reverberation box outside the working section of the water tunnel through spatial average technology measurement The sound pressure power spectrum of the reverberation box is obtained through standard sound source correction, and then the radiated sound power of the model in the free field under the impact of water flow is obtained. In order to further...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H11/08
CPCG01H11/08
Inventor 刘永伟姜虹旭曲俊超刘文博商德江
Owner HARBIN ENG UNIV
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