CN106644357A - Active grating device for generating vertical pulsation airflow - Google Patents
Active grating device for generating vertical pulsation airflow Download PDFInfo
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- CN106644357A CN106644357A CN201611055579.7A CN201611055579A CN106644357A CN 106644357 A CN106644357 A CN 106644357A CN 201611055579 A CN201611055579 A CN 201611055579A CN 106644357 A CN106644357 A CN 106644357A
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- 230000010349 pulsation Effects 0.000 title abstract description 8
- 230000033001 locomotion Effects 0.000 claims abstract description 29
- 238000013519 translation Methods 0.000 claims description 11
- 238000001228 spectrum Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 210000001367 artery Anatomy 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 235000021170 buffet Nutrition 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- ONUFESLQCSAYKA-UHFFFAOYSA-N iprodione Chemical compound O=C1N(C(=O)NC(C)C)CC(=O)N1C1=CC(Cl)=CC(Cl)=C1 ONUFESLQCSAYKA-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The present invention discloses an active grating device for generating vertical pulsation airflow. The device comprises a support framework fixed on a wind tunnel wall, and the support framework is sequentially hinged with a plurality of horizontally arranged vibration airfoil cascades at intervals from up to down; and the lower portion of the support framework is provided with a horizontally arranged first transfer bar and is provided with a driving device configured to drive the translational motion up and down of the first transfer bar; and the upper portion of the support framework is hinged with a vertically arranged second transfer bar, the lower end of the second transfer bar is hinged with the first transfer bar, and the second transfer bar is hinged with each vibration airfoil cascade. The active grating device for generating the vertical pulsation airflow generates the vertical pulsation airflow through the guide effect on the airflow by employing the vibration airfoil cascades, and has good airflow controllable features. A servo motor is employed to combine a digital control system to generate vertical pulsation airflow taking the single harmonic wave, the multi-frequency combination harmonic wave and the frequency spectrum characteristic controllable random vibration as features so as to have high applying performance.
Description
Technical field
The invention belongs to wind tunnel technique field, specifically related to a kind of active grid dress for producing vertical pulse pneumatic
Put.
Background technology
In long long-span bridges and large-span roof structure and similar structures wind- tunnel investigation, vertical pulse pneumatic is special
Property be the key factor for affecting wind-excited responese and wind load, therefore need carefully to be simulated in boundary layer wind tunnel test.But
Existing wind-tunnel technique is typically by the grille strip for intersecting anyhow, or the passive simulation mode such as multiple detached triangle wedges
Realize, still lack the active control analogy method that target component can be set.
For long span bridge structure and Long Span Roof Structures, vertical pulse pneumatic is most important wind field arteries and veins
Dynamic component, is the key of many wind tunnel test success or failure to the simulation of vertical flutter component.But, in existing wind-tunnel technique
Field, passive simulation device to based on the wedge that is vertically arranged, the grille strip that can be arranged with subsidiary level when needing, such mould
Plan method be hardly produced whole model installation region meet needs vertical wind spectrum, and its produce wind compose in wind-tunnel meeting with
The change of position and change.Meanwhile, it is initially false by single harmonic fluctuating wind that structure buffets power theory aerodynamic admittance function
If carry out reasoning, therefore it is very big to the meaning of buffeting theoretical research that single harmonic fluctuating wind is produced in wind-tunnel.Additionally, works
Feature wake flow, the usually from Periodic pulsing flow with certain spectrum signature, it can be by multistage Fourier space come table
Reach, and the wind of the natural wind spectrum usually from random pulse stream with certain spectrum signature.
The means for producing above-mentioned three category features pulsating flow in wind-tunnel at present are very deficient, according to the inventors knowledge it is domestic not yet
There is such common apparatus, therefore realize the active analogy method of specific frequency spectrum fluctuating wind field to theory by certain means
Research and practical engineering application are all significant.
The present invention is by project of national nature science fund project (No.51478181, U1534206) joint funding.
The content of the invention
For the problems referred to above, the present invention is intended to provide a kind of active grid that vertical pulse pneumatic can be produced in wind-tunnel,
The operation of control active grid can be passed through, single-frequency harmonic wave, multi-frequency combination harmonic and frequency spectrum is produced in grid downstream special
The vertical pulse pneumatic that the controllable random vibration of property is characterized.
The technical scheme of solve problem of the present invention is：A kind of active grid device for producing vertical pulse pneumatic, including solid
Scaffold on wind-tunnel wall, it is characterised in that：From top to bottom successively interval is hinged with many levels to the scaffold
The vibration latticed wing of setting；
The scaffold bottom is provided with horizontally disposed first drive link, and is provided with the first drive link upward-downward translation of driving
Driving means；
The scaffold upper articulation has the second vertically arranged drive link, the lower end of the second drive link and the first transmission
Bar is hinged, and the second drive link is hinged with each vibration latticed wing.
In such scheme, driving means drive the first drive link upward-downward translation, and drive the second drive link to move up and down, the
Two drive links guiding vibration latticed wing occurs that spectral characteristic is controllable to be swung up and down in wind field, so as to produce phase in the wind field of downstream
Answer the vertical pulse pneumatic of spectrum signature.
Specifically, the driving means include being fixed on the servomotor of scaffold bottom, are arranged on servomotor
Eccentric, the motion frame being set in outside eccentric in rotating shaft, the first drive link level is fixed on motion frame top, motion
Frame can upward-downward translation under eccentric drive.
In such scheme, servomotor band movable eccentric wheel is rotated in motion inframe, eccentric and motion frame or so inwall it
Between reserve certain space, so as to discharge left and right lateral movement in wobbler action, only guided-moving frame is moved along the vertical direction.
Motion frame upward-downward translation under eccentric drive, and then cause the first drive link upward-downward translation.
Eccentric can be designed as the component with the vertical motion displacement such as 10mm, 20mm, 30mm, can be shaken by regulation
The vertical amplitude of dynamic latticed wing changing the turbulence level size of vertical pulse pneumatic, to meet different experiments demand.
Preferably, the scaffold is at least divided into two regional frames from left from the right side, and each region inframe is from top to bottom
Successively interval is hinged with many horizontally disposed vibration latticed wings, and each region inframe is each at least provided with second drive link
The drive link of root second is hinged with the first drive link.
The present invention remarkable result be：
1. vertical pulse pneumatic is produced to the guiding function of air-flow by vibration latticed wing, air-flow vertically the cycle of pulsation with shake
The period of motion of dynamic latticed wing is identical, and fluctuating wind field turbulivity can need to adjust according to experiment, possess preferable air-flow controllable characteristics.
2. it is engaged using servomotor and control software, the vertical pulsation of single-frequency harmonic wave can be produced in wind-tunnel
Air-flow, the vertical pulse pneumatic of multi-frequency combination harmonic and according to a certain frequency spectrum for target the controllable random vertical arteries and veins of circulation
Take offence stream, possess very strong applicable performance.
Description of the drawings
Below in conjunction with the accompanying drawings the invention will be further described.
Fig. 1 is the main assembly drawing of the present invention.
Fig. 2 is the A-A sectional drawings in Fig. 1.
Fig. 3 is the B-B sectional drawings in Fig. 1.
Fig. 4 is vibration latticed wing drawing.
Fig. 5 is motion frame position drawing.
In figure：1st, scaffold；2nd, latticed wing is vibrated；3rd, the second drive link；4th, the first drive link；5th, motion frame；6th, servo
Motor；7th, eccentric.
Specific embodiment
For the ease of description, the relative position relation of each part is (such as：Upper and lower, left and right etc.) description be according to explanation
Restriction effect is not played to the structure of this patent come what is be described in the Butut direction of book accompanying drawing.
As shown in Fig. 1～5, a kind of active grid device for producing vertical pulse pneumatic, including being fixed on wind-tunnel wall
Scaffold 1, from top to bottom successively interval is hinged with many horizontally disposed vibration latticed wings 2 to the scaffold 1.
The bottom of the scaffold 1 is provided with horizontally disposed first drive link 4, and is provided with the first drive link of driving about 4
The driving means of translation.The driving means include being fixed on the servomotor 6 of the bottom of scaffold 1, are arranged on servomotor 6
Rotating shaft on eccentric 7, the motion frame 5 that is set in outside eccentric 7.The level of first drive link 4 is fixed on motion frame 5 and pushes up
Portion.Motion frame 5 can upward-downward translation under the drive of eccentric 7.
The upper articulation of the scaffold 1 has the second vertically arranged drive link 3, the lower end and first of the second drive link 3
Drive link 4 is hinged, and the second drive link 3 is hinged with each vibration latticed wing 2.
Eccentric 7 can be designed as the component with 10mm, 20mm, 30mm vertical motion displacement, can be shaken by regulation
The vertical amplitude of dynamic latticed wing 2 changing the turbulence level size of vertical pulse pneumatic, to meet different experiments demand.
In a kind of preferred embodiment, the scaffold 1 is at least divided into two regional frames from left from the right side.Each region
From top to bottom successively interval is hinged with many horizontally disposed vibration latticed wings 2 to inframe.Each region inframe is at least provided with one
Second drive link 3.Each second drive link 3 is hinged with the first drive link 4.
Servomotor 6 is rotated with movable eccentric wheel 7 in motion inframe 5, the upward-downward translation under the drive of eccentric 7 of motion frame 5, is entered
And cause the upward-downward translation of the first drive link 4.First drive link 4 drives the second drive link 3 to move up and down, and the second drive link 3 is guided
Vibration latticed wing 2 occurs that spectral characteristic is controllable to be swung up and down in wind field, so as to produce corresponding spectrum signature in the wind field of downstream
Vertical pulse pneumatic.
Following three types forms of motion can be realized by the cooperation of servomotor and servo-driver：
(1) single harmonic frequency movement, moving displacement d1=A.sin (ω t), wherein motion frequency f=0.1～3Hz can
Adjust, ω=2 π f, t are the time, A is moving displacement amplitude, is set according to grill designs initial condition.
(2) multiple-harmonic aggregate motion, moving displacementThe multistage harmonic combinations in j=2～10 can
Select as needed, wherein ω=2 π f, f is motion frequency, anFor moving displacement amplitude, t is the time.
(3) random motion, moving displacement d3 obtains exercise duration according to target wind spectrum by FFT inverse transformations, then passes through
Peak value antialiasing obtains the acceptable operation curve of motor operation.
Control targe is to realize the vertical pulsation controllable air flow with three class features.
In the present invention motion of servomotor 6 by software " grid operation control " come regulation parameter, it is single so as to realize
The multi-motion forms such as frequency harmonics motion, the motion of multi-frequency harmonic combinations and the random vibration with a certain frequency spectrum as target.Institute
" grid operation control " is stated for existing dbase.
Claims (3)
1. a kind of active grid device for producing vertical pulse pneumatic, including the scaffold being fixed on wind-tunnel wall（1）, it is special
Levy and be：The scaffold（1）From top to bottom successively interval is hinged with many horizontally disposed vibration latticed wings（2）；
The scaffold（1）Bottom is provided with horizontally disposed first drive link（4）, and it is provided with the first drive link of driving（4）On
The driving means of lower translation；
The scaffold（1）Upper articulation has the second vertically arranged drive link（3）, the second drive link（3）Lower end and the
One drive link（4）It is hinged, and the second drive link（3）With each vibration latticed wing（2）It is hinged.
2. the active grid device for producing vertical pulse pneumatic according to claim 1, it is characterised in that：It is described to drive dress
Put including being fixed on scaffold（1）The servomotor of bottom（6）, be arranged on servomotor（6）Rotating shaft on eccentric
（7）, be set in eccentric（7）Outer motion frame（5）, first drive link（4）Level is fixed on motion frame（5）Top, fortune
Dynamic frame（5）In eccentric（7）Can upward-downward translation under driving.
3. the active grid device for producing vertical pulse pneumatic according to claim 1, it is characterised in that：The supporting frame
Frame（1）At least it is divided into two regional frames from the right side from left, from top to bottom successively interval is hinged with many levels to each region inframe
The vibration latticed wing of setting（2）, each region inframe is at least provided with second drive link（3）, each second drive link（3）
With the first drive link（4）It is hinged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611055579.7A CN106644357A (en) | 2016-11-25 | 2016-11-25 | Active grating device for generating vertical pulsation airflow |
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| CN201611055579.7A CN106644357A (en) | 2016-11-25 | 2016-11-25 | Active grating device for generating vertical pulsation airflow |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132021A (en) * | 2017-06-02 | 2017-09-05 | 西南交通大学 | The prominent wind generation apparatus of sine for producing single-frequency total correlation fluctuating wind field |
| CN109813518A (en) * | 2019-01-23 | 2019-05-28 | 上海核工程研究设计院有限公司 | A kind of latticed wing blade construction and preparation method thereof |
| CN112051029A (en) * | 2020-08-03 | 2020-12-08 | 天津大学 | Double-layer transverse oscillation grid water tank |
| CN112985744A (en) * | 2021-03-24 | 2021-06-18 | 中国科学院工程热物理研究所 | Grid device for wind tunnel experiment and regulating and controlling method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132021A (en) * | 2017-06-02 | 2017-09-05 | 西南交通大学 | The prominent wind generation apparatus of sine for producing single-frequency total correlation fluctuating wind field |
| CN109813518A (en) * | 2019-01-23 | 2019-05-28 | 上海核工程研究设计院有限公司 | A kind of latticed wing blade construction and preparation method thereof |
| CN112051029A (en) * | 2020-08-03 | 2020-12-08 | 天津大学 | Double-layer transverse oscillation grid water tank |
| CN112985744A (en) * | 2021-03-24 | 2021-06-18 | 中国科学院工程热物理研究所 | Grid device for wind tunnel experiment and regulating and controlling method thereof |
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Effective date of registration: 20240322 Address after: 410000 Shanmen, Lushan South Road, Yuelu District, Changsha City, Hunan Province Applicant after: HUNAN University Country or region after: China Address before: 410012 Wind Tunnel Laboratory, School of Civil Engineering, Hunan University, Juzizhou Street, Yuelu District, Changsha City, Hunan Province Applicant before: Niu Huawei Country or region before: China Applicant before: Chen Zhengqing Applicant before: Hua Xugang |
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