CN204405181U - Frequency test device is put in the wind whirlpool that shakes - Google Patents
Frequency test device is put in the wind whirlpool that shakes Download PDFInfo
- Publication number
- CN204405181U CN204405181U CN201520073741.2U CN201520073741U CN204405181U CN 204405181 U CN204405181 U CN 204405181U CN 201520073741 U CN201520073741 U CN 201520073741U CN 204405181 U CN204405181 U CN 204405181U
- Authority
- CN
- China
- Prior art keywords
- rectangular parallelepiped
- wind
- test specimen
- test
- shakes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The purpose of this utility model is to provide the wind whirlpool that shakes to put frequency test device, comprise wind to shake test pipe, motor, fan, test specimen fixed pedestal, the wind test pipe front end that shakes is rectangular parallelepiped, the wind test pipe tail end that shakes is cylinder, rounding off between rectangular parallelepiped and cylinder, rectangular parallelepiped open-ended, the end face of cylinder arranges adjustable window shutter, motor is arranged on rear side of cylinder, fan is arranged on cylinder inside, be connected by transmission shaft between motor with fan, slippage sliding door is set bottom rectangular parallelepiped, test specimen fixed pedestal is arranged on below rectangular parallelepiped, and be positioned at slippage sliding door place, test specimen fixed pedestal fixes straight-bar, rotating shaft is installed by keyway in straight-bar top, rotating shaft connects the test specimen fixed head being used for fixing test specimen, test specimen fixed head is arranged pressure gauge and accelerometer, the inwall of rectangular parallelepiped arranges air speed measuring apparatus.The utility model effectively simulates aeolian vibration situation under physical condition, at utmost realizes the measurement that frequency is put in whirlpool.
Description
Technical field
The utility model relates to a kind of test unit, specifically frequency test device is put in the wind whirlpool that shakes.
Background technology
When air is with given pace and member contact, air leading edge hinders by component and produces higher-pressure region, and higher-pressure region along component both sides to downward-extension, will arrive cross-sectional width maximum and be separated, along body structure surface generation backflow phenomenon after air separation.Backflow makes former boundary layer of air depart from component surface, forms the free shear layer extended to downstream and the wake zone be clipped between two shear layers.Freely flow district due to shear layer and periphery to contact, speed can be greater than inner wake zone, and air then disperses first producing some whirlpools with some cycles.When vortex shedding component, the corresponding reduction of lift that it produces component, until disappear, and offside continues to produce next whirlpool, and generate the power contrary with lift direction just now, often pair of whirlpool forms one group perpendicular to the cyclic force carrying out flow path direction, go round and begin again and act on component, cause the vibration of component, this vibration is called aeolian vibration, and the vibration frequency that now whirlpool causes is called that frequency is put in the wind whirlpool that shakes.
When frequency is put with component natural frequency close to time even identical in aeolian vibration whirlpool, will make component generation resonance effect, and cause the high vibration of component, producing to destroy on component even affects integrally-built normal work.Therefore, obtain the wind of component under a certain condition of work and shake that to put frequency just very important in whirlpool, just make the natural frequency of component put frequency away from its wind whirlpool that shakes as far as possible in the design phase.But when scantling is comparatively large or experiment condition is difficult to meet, take the test of shaking of the wind under simulating actual conditions will there is high cost, shortcoming such as waste resource etc., at this moment take the scaling factor wind-tunnel wind of low cost shake test just seem very important, can not only reduce costs, and also have the features such as test unit is simple, convenient.
Summary of the invention
The purpose of this utility model is to provide and is applicable to board type members wind wind that whirlpool the puts frequency measurement whirlpool that shakes that shakes and puts frequency test device.
The purpose of this utility model is achieved in that
Frequency test device is put in the utility model wind whirlpool that shakes, it is characterized in that: comprise wind and to shake test pipe, motor, fan, test specimen fixed pedestal, the wind test pipe front end that shakes is rectangular parallelepiped, the wind test pipe tail end that shakes is cylinder, rounding off between rectangular parallelepiped and cylinder, rectangular parallelepiped open-ended, the end face of cylinder arranges adjustable window shutter, motor is arranged on rear side of cylinder, fan is arranged on cylinder inside, be connected by transmission shaft between motor with fan, slippage sliding door is set bottom rectangular parallelepiped, test specimen fixed pedestal is arranged on below rectangular parallelepiped, and be positioned at slippage sliding door place, test specimen fixed pedestal fixes straight-bar, pull through slippage and be positioned in rectangular parallelepiped and install rotating shaft by keyway in straight-bar top, rotating shaft connects the test specimen fixed head being used for fixing test specimen, test specimen fixed head is arranged pressure gauge and accelerometer, the inwall of rectangular parallelepiped arranges air speed measuring apparatus.
Advantage of the present utility model is: the utility model passes through to change the intake in the opening and closing extent control pipeline of window shutter thus control air velocity duct, effectively aeolian vibration situation under simulation physical condition; Frequency is put in the wind utilizing the change of pedestal corner the to measure different Windward angle lower member whirlpool that shakes, and at utmost realizes the measurement that frequency is put in whirlpool.
Accompanying drawing explanation
Fig. 1 is front view of the present utility model;
Fig. 2 is left view of the present utility model;
Fig. 3 is vertical view of the present utility model;
Fig. 4 is test specimen fixed pedestal front view;
Fig. 5 is test specimen fixed pedestal partial enlarged drawing;
Fig. 6 is axonometric drawing of the present utility model.
Embodiment
Below in conjunction with accompanying drawing citing, the utility model is described in more detail:
Composition graphs 1 ~ 6, the wind of the present utility model whirlpool that shakes is put frequency brief test device and is shaken by wind that test pipe, window shutter 2, motor 1, fan 3, wind speed knotmeter 4, test specimen fixed pedestal 5, slippage pull 6, pressure gauge, accelerometer are formed, as shown in Figure 6.Motor 1 is placed in pipeline afterbody rear, and fan 3 to be connected with motor 1 by axle system and to be placed in pipeline afterbody, and flabellum radius is 0.4m, refers to Fig. 1.Pipeline afterbody is tubular structure, radius R=0.5m, and long is L=0.4m; The square pipe of progressively transition to be the length of side be a=0.6m forward, transition distance d=0.2m, square pipe length is D=1m, and top is furnished with wind speed knotmeter 4, below is provided with the slippage sliding door 6 being of a size of a × b=0.3m × 0.2m, convenient placement test specimen fixed pedestal 5.The unified transparent organic glass adopting h=0.01m of pipe thickness, convenient observation pipeline inner member Vibration Condition, refers to Fig. 6.
(1) test specimen fixed pedestal
Test specimen fixed pedestal is arranged to rotating form, with meet different angles wind shake test requirement.Base bottom is provided with the gravity block of 20Kg, ensure the stability of pedestal during component vibration, base bottom and upper component bearing adopt square steel to be connected, square steel length of side l=0.04m, component bearing knuckle radius is 0.03m, and test specimen fixed head is the square plate of length of side a=0.1m, side's plate is provided with fixed screw, and be furnished with pressure gauge, accelerometer, for measuring pressure when component wind shakes and acceleration, and then frequency f is put in the wind the obtaining component whirlpool that shakes
s'.
(2) wind speed knotmeter
By the concrete size (a=0.6m) of aforementioned known square pipe, by Reynolds number formula Re=VL/ μ, L is hydraulic radius, and wind speed knotmeter can record wind speed in square tube, utilize formula to calculate Reynolds number.For warranty test is consistent with actual conditions, should make both Reynolds numbers (Re) equal guarantee test identical with practical flow field situation, by formula
frequency is put in the whirlpool that can obtain component reality
The purpose of this utility model is implemented by following technical solution:
(1) wind shakes test pipe
Wind shakes test pipe different forms: pipeline afterbody is the drum forms of large radius, and progressively transition is the form of square pipe forward, is furnished with wind speed knotmeter above square pipe, and below is provided with slippage sliding door, and this is conducive to the layout of instrument and measuring equipment.
(2) window shutter
Pipeline afterbody is provided with window shutter, controls the intake of pipeline thus controls wind speed in pipeline, meet test condition by the opening and closing angle of adjusting louver window.Motor arrangement is in pipeline external, and fan is placed in pipeline afterbody, and by axle, system is connected with motor.
(3) test specimen fixed pedestal
Test specimen bearing is connected with pedestal by straight-bar, and rotating shaft is connected with straight-bar by keyway, by regulating rotating shaft can change test specimen by the angle of wind disturbance, thus records the different angles lower member wind whirlpool that shakes and puts frequency.Test specimen bearing is provided with pressure gauge, accelerometer simultaneously, can record the velocity and acceleration etc. of component vibration.
The wind test pipe afterbody that shakes is cylindrical shape, and afterbody is provided with adjustable window shutter, and pipeline is transitioned into forward square, and bottom is provided with slippage sliding door, pipeline front opening; Motor is placed in outside pipeline afterbody, and fan is placed in pipeline afterbody, is connected with motor by transmission shaft; Pipeline projected square part is furnished with air speed measuring apparatus; Test specimen fixed pedestal is arranged in slippage sliding door place, pedestal is furnished with pressure gauge, accelerometer, and pedestal fixed component place can adjusting angle.
Driven by motor fan turns produces wind, and wind is forward direction in the duct, and wind speed knotmeter can record air speed value in pipeline, and then can calculate fluids within pipes Reynolds number.Can intake in pipeline be controlled by adjusting louver window thus control the size of wind speed in pipeline, and then change flow field Reynolds number, identical with actual conditions Reynolds number with warranty test, true reappearance practical flow field situation.
Pipeline front portion is designed to square being conducive to and arranges instrument, and bottom is provided with slippage sliding door and is convenient to place test specimen, and the measurement of frequency is put in the wind that adjustable pedestal can the realize different angles plate whirlpool that shakes.
By wind speed in adjusting louver window switch extent control pipeline, wind speed knotmeter is utilized to record air speed value V' in pipeline, realize test consistent with the reynolds number Re of actual conditions, thus the wind that it is identical with practical flow field to realize test, utilizes pressure gauge, accelerometer records component shakes, frequency f is put in whirlpool
s', by formula
frequency is put in the whirlpool that can obtain component reality
reach and measure the wind of the large-scale component whirlpool that shakes with less testpieces and put frequency, when can realize different angles by adjustable pedestal, frequency measurement is put in the wind of the component whirlpool that shakes.
Claims (1)
1. frequency test device is put in the wind whirlpool that shakes, it is characterized in that: comprise wind and to shake test pipe, motor, fan, test specimen fixed pedestal, the wind test pipe front end that shakes is rectangular parallelepiped, the wind test pipe tail end that shakes is cylinder, rounding off between rectangular parallelepiped and cylinder, rectangular parallelepiped open-ended, the end face of cylinder arranges adjustable window shutter, motor is arranged on rear side of cylinder, fan is arranged on cylinder inside, be connected by transmission shaft between motor with fan, slippage sliding door is set bottom rectangular parallelepiped, test specimen fixed pedestal is arranged on below rectangular parallelepiped, and be positioned at slippage sliding door place, test specimen fixed pedestal fixes straight-bar, pull through slippage and be positioned in rectangular parallelepiped and install rotating shaft by keyway in straight-bar top, rotating shaft connects the test specimen fixed head being used for fixing test specimen, test specimen fixed head is arranged pressure gauge and accelerometer, the inwall of rectangular parallelepiped arranges air speed measuring apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520073741.2U CN204405181U (en) | 2015-01-30 | 2015-01-30 | Frequency test device is put in the wind whirlpool that shakes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520073741.2U CN204405181U (en) | 2015-01-30 | 2015-01-30 | Frequency test device is put in the wind whirlpool that shakes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204405181U true CN204405181U (en) | 2015-06-17 |
Family
ID=53429032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520073741.2U Withdrawn - After Issue CN204405181U (en) | 2015-01-30 | 2015-01-30 | Frequency test device is put in the wind whirlpool that shakes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204405181U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634446A (en) * | 2015-01-30 | 2015-05-20 | 哈尔滨工程大学 | Wind vibration vortex amplification frequency testing device |
-
2015
- 2015-01-30 CN CN201520073741.2U patent/CN204405181U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634446A (en) * | 2015-01-30 | 2015-05-20 | 哈尔滨工程大学 | Wind vibration vortex amplification frequency testing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Açıkel et al. | Control of laminar separation bubble over wind turbine airfoil using partial flexibility on suction surface | |
| Ryan et al. | Three-dimensional flow field around and downstream of a subscale model rotating vertical axis wind turbine | |
| Wanchat et al. | A parametric study of a gravitation vortex power plant | |
| Li et al. | Experimental and numerical investigation of free surface vortex | |
| Corke et al. | Sensing and control of flow separation using plasma actuators | |
| CN201060093Y (en) | 3/4 opening reversed flow type automobile model wind-tunnel test device | |
| Xu et al. | Experimental and numerical study of a hydrokinetic turbine based on tandem flapping hydrofoils | |
| CN104634446B (en) | Put frequency test device in wind shake whirlpool | |
| CN203443970U (en) | Direction controllable pitot tube | |
| CN103364168B (en) | A kind of opening/closing mouth dual-structure breeze wind-tunnel | |
| Ma et al. | Effect of the Reynolds number on the aerodynamic forces and galloping instability of a cylinder with semi-elliptical cross sections | |
| CN104132831A (en) | Adjustable constant speed sampling system | |
| CN105628332A (en) | Device for adjusting boundary layer wind tunnel test bottom turbulence degree by changing cylinder rotation speed | |
| CN204405181U (en) | Frequency test device is put in the wind whirlpool that shakes | |
| CN106644332B (en) | It flows sharp whirlpool and puts frequency experimental provision | |
| CN102661838B (en) | Test device for researching wake-induced vibration of deep-water riser | |
| CN202049100U (en) | Fluid boundary layer resistance testing balance | |
| CN102494863B (en) | Device used for testing height of hypersonic wind tunnel continuous variable projection | |
| CN109520701A (en) | A kind of channel flow field simulator | |
| Shah et al. | Unsteady Lift Produced by a Flat-Plate Wing Translating Past Finite Obstacles | |
| CN116124408A (en) | Self-adaptive control small wind tunnel experiment system for front and rear wing models of racing car | |
| CN203798531U (en) | Device for observing starting wind speed of sand | |
| CN205719470U (en) | A kind of increase boundary layer wind tunnel test in bottom turbulivity rotatable cylinder arrangement | |
| Jafari et al. | Power generation analysis of PowerWindow, a linear wind generator, using computational fluid dynamic simulations | |
| CN102519706B (en) | Self-excited oscillation test device of deepwater buoy platform and test method |
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: 20150617 Effective date of abandoning: 20180119 |