CN205918710U - A device for suppressing cavity flows excitation and swings line spectrum noise under water - Google Patents
A device for suppressing cavity flows excitation and swings line spectrum noise under water Download PDFInfo
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- CN205918710U CN205918710U CN201620678659.7U CN201620678659U CN205918710U CN 205918710 U CN205918710 U CN 205918710U CN 201620678659 U CN201620678659 U CN 201620678659U CN 205918710 U CN205918710 U CN 205918710U
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- thin film
- hydraulic cylinder
- line spectrum
- driving thin
- under water
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Abstract
The utility model belongs to the technical field of vibration noise control, in particular to is noise damping means under water. A device for suppressing cavity flows excitation and swings line spectrum noise under water which technical scheme is: during the solenoid circular telegram, driving thin film does the cycle movement in the hydraulic cylinder under the effect of electromagnetic force, is the electrical energy conversion who inputs film movement's kinetic energy: when driving thin film expanded, the hydraulic cylinder internal pressure reduced, and external fluid is in the slit is by the suction chamber, when driving thin film shrinks, increased pressure in the pneumatic cylinder, pneumatic cylinder internal flow integument discharge cavity. Thereby the department produces the permanent efflux of non - at the top cap slit. Through the swirl of pulse jet production and the interact of shear layer, strong acting on takes place with trompil incoming flow shear layer for the efflux, has destroyed the sustained oscillation of shear layer, can realize that the convection current swashs the suppression of line spectrum noise.
Description
Technical field
This utility model belongs to Control Technique of Vibration and Noise field, particularly to underwater noise control device.
Background technology
There is perforate in underwater sailing body surface, because the excitation of turbulent shear layer is it is likely that can go out when it navigates by water under water
The stream of existing cavity swashs self sustained oscillation line spectrum noise, has a strong impact on it disguised.The control of cavity stream Induced Oscillation line spectrum noise although
Change cavity size can be taken, increase some passive measures such as grid, but control effect is not typically notable.Trace it to its cause,
It is which kind of mode due to no matter, the fluid driving source of tapping yet suffers from.
The fluid self sustained oscillation of tapping cavity is the root of open flow sounding.Cavity self sustained oscillation can be divided into three kinds
Type: fluid dynamic oscillation, fluid-acoustic resonance vibration, fluid-elastic oscillation.The self sustained oscillation of cavity contains shear layer not
Stability, the fluid structurecoupling such as interaction between turbulent flow and structure and noise, stream acoustical coupling complicated phenomenon.But, either
That cavity self sustained oscillation, its driving source is along the unstable shear flow of accent.Therefore, in order to control cavity stream Induced Oscillation
Line spectrum noise, it is critical only that the control realized to accent shear flow.
This theoretical background of sensitivity to microvariations is had based on turbulent flow macroscopic system, is produced using microminiature activator
Raw microvariations are coupled with main flow flowing, thus significantly changing the flow regime of main flow, it is possible to achieve the active to macroscopic view flowing
Control.Cavity leading edge is to form the source of shear flow, and this position is very sensitive to accepting fluid small sample perturbations.Based on this, in sky
Leading edge cavity introduces small velocity disturbance, shearing laminar flow can be controlled, and then destroy the self-sustained oscillation of cavity shear flow
Swing, reduce stream Induced Oscillation line spectrum noise.In recent years, in aerospace field, for air dielectric, used tiny flow control
Device suppresses the research of cavity stream Induced Oscillation noise, but at present and have not seen that to be applied to cavity stream Induced Oscillation under water noise control
Report.
Content of the invention
The purpose of this utility model is: provide one kind can work under water, structure is simple, be easily achieved, reliability is high,
The strong mjector of easy for installation, environmental suitability, realizes perforate stream in underwater sailing body surface is swashed with the control of cavity line spectrum noise
System.
The technical solution of the utility model is: a kind of device for suppressing cavity stream Induced Oscillation line spectrum noise under water, it
Including: solenoid, drive thin film, hydraulic cylinder, top cover, bottom, pedestal；
Solenoid is the coiled multiple times loop being wrapped in magnetic core surface integration packaging, and it stretches out three feeler insertion pedestals
In three apertures that lower surface is reserved；
Drive thin film to adopt electrostriction material, drive thin film be located at pedestal inner bottom surface and with three feeler positions of solenoid
Corresponding；
The equal opening in hydraulic cylinder two ends, it is located at pedestal inner chamber, and hydraulic cylinder lower ending opening is connected with the edge driving thin film,
Upper end open is connected with top cover；When the solenoid is energized, three feelers generation electromagnetic forces cause driving thin film along hydraulic cylinder axis
Make periodicity piston movement；
Top cover surface has rectangular cutout, and when driving thin film to make periodicity piston movement, fluid is inhaled by slit
Enter or discharge, form pulsing jet；
Bottom is fixed on the lower surface of pedestal, clasps and stationary solenoids；
Pedestal adopts resin material, drives thin film and hydraulic cylinder for integration packaging.
This utility model, according to the mechanism of production of cavity stream Induced Oscillation line spectrum noise, is arranged on sail body surface perforate leading edge
At aperture, and ensure that top cover slit (rectangular cutout) place jet direction is vertical with shear layer flow direction, slit length as far as possible
Close with sail body cavity transverse width dimension.The control effect of cavity flow induced vibration line spectrum noise, mainly by pulsing jet
Frequency and two parameters of speed determine.Jet frequency is the frequency driving thin film to make harmonic moving in hydraulic cylinder, according to navigation
The frequency of body cavity flow induced vibration Noise line spectra, adjusts the frequency driving thin film to make harmonic moving, thus it is possible to vary at top cover slit
The frequency of jet.Effluxvelocity makees harmonic moving displacement, hydraulic cylinder cavity size, and top cover by driving thin film in hydraulic cylinder
Slit sizes together decide on, and can change effluxvelocity by changing top cover slit width.In order to reach to cavity stream Induced Oscillation
The preferable control effect of line spectrum noise, typically should make the frequency of pulsing jet and cavity line spectrum noise frequency at top cover slit connect
Closely, effluxvelocity is about shear layer speed of incoming flow 1%.Now, the phase interaction of the whirlpool being produced by pulsing jet and shear layer
With jet to be flowed shear layer and strong effect occurs with perforate, destroys the self sustained oscillation of shear layer, you can realizes convection current and swashs line spectrum
The suppression of noise.
Beneficial effect: this utility model size is little, version simple, and movement parts are few, reliability is high, cheap.?
When sail body surface is installed, can be directly welded near perforate, mounting means is simple and reliable, easy accessibility；Meanwhile, construction profile
Size and perforate integrated design be not it is ensured that destroy the line style near perforate.
Brief description
Fig. 1 is this utility model structural representation；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is utility model works schematic diagram.
Specific embodiment
Referring to accompanying drawing, a kind of device for suppressing cavity stream Induced Oscillation line spectrum noise under water, comprising: solenoid 1, driving
Thin film 2, hydraulic cylinder 3, top cover 4, bottom 5, pedestal 6.
Solenoid 1 is the coiled multiple times loop being wrapped in magnetic core surface integration packaging, and it stretches out three feeler insertion bases
In three apertures that seat 6 lower surface is reserved；When solenoid 1 is energized, three feelers produce electromagnetic force and cause driving thin film 2 along liquid
The axial direction of cylinder pressure 3 makees periodicity piston movement；
Thin film 2 is driven to select common electrostriction material, thickness is determined by required effluxvelocity size.
Hydraulic cylinder 3 is located at pedestal 6 inner chamber, and hydraulic cylinder 3 lower surface is connected with the edge driving thin film 2, upper end and top cover 4
It is connected, three is in connecting portion good seal；
Top cover 4 surface has slit, when drive thin film 2 make periodicity piston movement when, fluid be inhaled into by slit or
Discharge, form pulsing jet；
Bottom 5 clasps and stationary solenoids 1 from below, is fixed on the lower surface of pedestal 6；
Pedestal 6 adopts resin material, drives thin film 2 and hydraulic cylinder 3 for integration packaging together with top cover 4.
During solenoid 1 energising, drive thin film 2 in the presence of electromagnetic force, in hydraulic cylinder 3, make cycle movement, will be defeated
The electric energy entering is converted to the kinetic energy of film movement: when driving thin film 2 outward expansion, hydraulic pressure in-cylinder pressure reduces, external fluid
It is inhaled into intracavity through slit；When driving thin film 2 to contract, hydraulic pressure in-cylinder pressure increases, and in hydraulic cylinder, fluid is discharged chamber
Body.Thus producing time-dependent jet at top cover 4 slit, as shown in Figure 3.
The concrete number of assembling steps of this utility model is as follows:
Solenoid 1 three feeler is inserted in the hole that pedestal 6 is reserved a；
B covers bottom 5 in solenoid 1 bottom, is connected fastening by screw with pedestal 6；
C will drive thin film 2 to be positioned over inside pedestal 6, is inserted in cylindrical hydraulic cylinder 3；
D top cover 4, is connected fastening by screw with pedestal 6；
Cavity stream vibration noise restraining device after e will install is welded on sail body surface perforate edge.
Claims (4)
1. a kind of device for suppressing cavity stream Induced Oscillation line spectrum noise under water, is characterized in that: it includes: solenoid (1), drives
Dynamic thin film (2), hydraulic cylinder (3), top cover (4), bottom (5), pedestal (6)；
Described solenoid (1) is the coiled multiple times loop being wrapped in magnetic core surface integration packaging, and it stretches out three feeler insertions
In three apertures that described pedestal (6) lower surface is reserved；
Described driving thin film (2) adopts electrostriction material, drive thin film (2) be located at pedestal (6) inner bottom surface and with described helical
(1) three feeler position of pipe is corresponding；
The equal opening in described hydraulic cylinder (3) two ends, it is located at described pedestal (6) inner chamber, described hydraulic cylinder (3) lower ending opening with described
The edge driving thin film (2) connects, and upper end open is connected with described top cover (4)；When described solenoid (1) is energized, described
Three feelers produce electromagnetic force and cause described driving thin film (2) to make periodicity piston movement along described hydraulic cylinder (3) axis；
Described top cover (4) surface has rectangular cutout, and when described driving thin film (2) makees periodicity piston movement, fluid leads to
Cross described slit to be inhaled into or discharge, form pulsing jet；
Described bottom (5) is fixed on the lower surface of described pedestal (6), clasps and fixing described solenoid (1)；
Described pedestal (6) adopts resin material, for driving thin film (2) and described hydraulic cylinder (3) described in integration packaging.
2. a kind of device for suppression cavity stream Induced Oscillation line spectrum noise under water as claimed in claim 1, is characterized in that: described
Hydraulic cylinder (3) is using cylindrical or cuboid.
3. a kind of device for suppression cavity stream Induced Oscillation line spectrum noise under water as claimed in claim 1 or 2, is characterized in that:
By changing the width of described top cover (4) surface rectangular cutout, the speed making pulsing jet is cavity shear layer speed of incoming flow
1%.
4. a kind of device for suppression cavity stream Induced Oscillation line spectrum noise under water as claimed in claim 1 or 2, is characterized in that:
The length of described top cover (4) rectangular cutout is consistent with sail body cavity transverse width dimension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620678659.7U CN205918710U (en) | 2016-06-30 | 2016-06-30 | A device for suppressing cavity flows excitation and swings line spectrum noise under water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620678659.7U CN205918710U (en) | 2016-06-30 | 2016-06-30 | A device for suppressing cavity flows excitation and swings line spectrum noise under water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205918710U true CN205918710U (en) | 2017-02-01 |
Family
ID=57873953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620678659.7U Withdrawn - After Issue CN205918710U (en) | 2016-06-30 | 2016-06-30 | A device for suppressing cavity flows excitation and swings line spectrum noise under water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205918710U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106015202A (en) * | 2016-06-30 | 2016-10-12 | 中国船舶重工集团公司第七〇九研究所 | Device for suppressing flow-induced oscillation line-spectrum noise of underwater cavity |
| CN110435817A (en) * | 2019-07-19 | 2019-11-12 | 中国船舶重工集团公司第七一九研究所 | A kind of sharp oise damping means of underwater bossy body stream |
| CN110500345A (en) * | 2019-08-29 | 2019-11-26 | 浙江大学 | A kind of synthesizing jet-flow array apparatus |
-
2016
- 2016-06-30 CN CN201620678659.7U patent/CN205918710U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106015202A (en) * | 2016-06-30 | 2016-10-12 | 中国船舶重工集团公司第七〇九研究所 | Device for suppressing flow-induced oscillation line-spectrum noise of underwater cavity |
| CN106015202B (en) * | 2016-06-30 | 2018-06-22 | 中国船舶重工集团公司第七一九研究所 | For inhibiting the device of underwater cavity stream Induced Oscillation line spectrum noise |
| CN110435817A (en) * | 2019-07-19 | 2019-11-12 | 中国船舶重工集团公司第七一九研究所 | A kind of sharp oise damping means of underwater bossy body stream |
| CN110500345A (en) * | 2019-08-29 | 2019-11-26 | 浙江大学 | A kind of synthesizing jet-flow array apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170201 Effective date of abandoning: 20180622 |