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Device for Suppressing Line Spectrum Noise of Flow-induced Oscillation in Underwater Cavity

A technology of oscillating line spectrum and suppressing water, applied in the direction of fluid flow, mechanical equipment, etc., can solve problems such as control of flow-induced oscillation noise in underwater cavities, and achieve simple and reliable installation method, convenient disassembly and assembly, and moving parts. less effect

Inactive Publication Date: 2018-06-22
NO 719 RES INST CHINA SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, in the field of aerospace, for the air medium, there have been studies on the use of micro-flow control devices to suppress the flow-induced oscillation noise of the cavity, but there is no report on the control of the flow-induced oscillation noise of the underwater cavity.

Method used

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  • Device for Suppressing Line Spectrum Noise of Flow-induced Oscillation in Underwater Cavity
  • Device for Suppressing Line Spectrum Noise of Flow-induced Oscillation in Underwater Cavity
  • Device for Suppressing Line Spectrum Noise of Flow-induced Oscillation in Underwater Cavity

Examples

Experimental program
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Embodiment Construction

[0018] Referring to the accompanying drawings, a device for suppressing flow-induced oscillation line spectrum noise in an underwater cavity includes: a solenoid 1 , a driving membrane 2 , a hydraulic cylinder 3 , a top cover 4 , a bottom cover 5 , and a base 6 .

[0019] Solenoid 1 is a multi-wound coil wrapped on the surface of the magnetic core and integrated into the package. It extends three tentacles and inserts them into three small holes reserved on the lower end surface of base 6; when solenoid 1 is energized, the three The electromagnetic force generated by the tentacles causes the driving membrane 2 to make periodic piston movements along the axial direction of the hydraulic cylinder 3;

[0020] The driving film 2 is selected from common electrostrictive materials, and the thickness is determined by the required jet velocity.

[0021] The hydraulic cylinder 3 is located in the inner cavity of the base 6, the lower end surface of the hydraulic cylinder 3 is connected...

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Abstract

The invention belongs to the technical field of control over vibration noise and particularly relates to a device for controlling underwater noise. The technical scheme of a device for suppressing flow-induced oscillation line-spectrum noise of an underwater cavity is that when a solenoid is electrified, a driving film does cyclical movement in a hydraulic cylinder under the action of an electromagnetic force, and converts inputted electric energy into kinetic energy for film movement; when the driving film expands, the pressure in the hydraulic cylinder is reduced, and external fluid is sucked into the cavity through a slit; and when the driving film shrinks, the pressure in the hydraulic cylinder is increased, and the fluid in the hydraulic cylinder is drained out of the cavity, thereby generating unsteady jet flow at the slit of a top cover. By utilization of mutual action of vortex generated by pulsating jet and a shear layer, jet flow and an open pore enter the shear layer for generating a strong effect and damaging self-sustained oscillation of the shear layer, thereby realizing the suppression on the flow-induced oscillation line-spectrum noise.

Description

technical field [0001] The invention belongs to the technical field of vibration and noise control, in particular to an underwater noise control device. Background technique [0002] There are openings on the surface of the underwater vehicle, and due to the excitation of the turbulent shear layer during underwater navigation, it is likely that there will be flow-induced self-sustained oscillation line spectrum noise in the cavity, which will seriously affect its concealment. Although some passive measures such as changing the size of the cavity and adding grids can be taken to control the line spectrum noise of the cavity flow-induced oscillation, the control effect is generally not significant. The reason is that no matter which way, the fluid excitation source at the opening still exists. [0003] The self-sustained oscillation of the fluid in the cavity at the opening is the root of the sound generated by the flow in the opening. Cavity self-sustained oscillations can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15D1/00
CPCF15D1/00
Inventor 汪利李红钢华如南徐俊郑国垠黎雪刚曹为午
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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