CN108225715A - A kind of Three Degree Of Freedom large amplitude free vibration flow tunnel testing device - Google Patents
A kind of Three Degree Of Freedom large amplitude free vibration flow tunnel testing device Download PDFInfo
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- CN108225715A CN108225715A CN201810211940.3A CN201810211940A CN108225715A CN 108225715 A CN108225715 A CN 108225715A CN 201810211940 A CN201810211940 A CN 201810211940A CN 108225715 A CN108225715 A CN 108225715A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
-
- 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
- G01M9/08—Aerodynamic models
Abstract
The present invention provides a kind of Three Degree Of Freedom large amplitude free vibration flow tunnel testing devices, belong to bridge wind tunnel experiment engineering device technique field.Bridge Three Degree Of Freedom coupling large amplitude free vibration flow tunnel testing device include implosion test model, rigid round bar, rigid arm, with reeded circular arc block, high-strength light cord, linear stretch spring, fixed pulley and bearing.The present apparatus can effectively solve the problem of in traditional Three Degree Of Freedom vibration testing device Vertical Spring lateral tilt under the conditions of horizontal positioned lateral springs downwarp and large amplitude and then lead to not ensure linear vertical rigidity, linear torsion rigidity and linear lateral rigidity；The present apparatus is simple, it is easy for installation, it can easily be accommodated the initial angle of attack, due to avoiding spring downwarp and inclination in overtravel is vibrated, even if the linear rigidity of guarantee system and highly stable vibration frequency are therefore remained able in substantially vibration processes so that the aerodynamic characteristic research of bridge three dimensional non-linear is possibly realized under the conditions of large amplitude.
Description
Technical field
The present invention relates to a kind of can realizing bridge rigid model large amplitude and can ensure linear vertical rigidity, line
The Three Degree Of Freedom free vibration flow tunnel testing device of property torsion stiffness and linear lateral rigidity, and in particular to hung to by circular arc
The vertical and twisted coupling large amplitude free vibration system that arm, high-strength light cord, vertical linearity extension spring and fixed pulley are formed
The lateral free oscillating system that system and high-strength light cord, bearing, vertical linearity extension spring and fixed pulley are formed, by bridge
The Three Degree Of Freedom coupling large amplitude free vibration of beam rigid model is converted into the vertical of Hookean spring and freely stretches, and utilizes spring
Linear stretch rigidity, rigid circular arc arm and fixed pulley realize that the vertical and lateral linear translation rigidity of system and linear torsion are firm
Degree.Since system is entirely substantially during coupled vibrations, mass of system and the quality moments of inertia, spring rate, the arm of force are constant always,
Therefore it the vertical translation frequency of system, lateral translation frequency and is kept constant around centre of sprocket torsional frequency.
Background technology
Three Degree Of Freedom coupling free vibration method is a kind of master of bridge wind tunnel experiment vibration measuring (whirlpool shakes, buffets, galloping, flutter)
Want a kind of important wind tunnel test methods of method and the identification of Bridge Flutter derivative.Traditional Three Degree Of Freedom coupling free vibration examination
Experiment device is that device is simple using vertical and lateral springs suspension girder Segment Model, advantage, and it is convenient to realize.For small amplitude
Three Degree Of Freedom coupling free vibration, the lateral tilt of vertical extension spring is smaller, and lateral extension spring vertical motion is smaller, erect
Meet linear geometry rigidity condition to the lateral spring analogy that stretches.However, legacy system has the following problems：(1) it laterally pulls
Stretch spring due to Gravitative Loads and can be sagging, can not ensure level, therefore linear rigidity can not ensure；(2) model is vertical and turns round
When rotational oscillation moves, lateral extension spring can also generate vertical motion, increase the damping of system；(3) model is vertical and during twisting vibration,
Influence of the lateral springs to system mode quality is not easy to determine；(4) when lateral and twisting vibration occurs for model, vertical extension spring
Also lateral vibration can occur, increase the damping of system；(5) when lateral and twisting vibration occurs for model, vertical extension spring is to being
The influence of system modal mass is not easy to determine.(6) when torsional amplitudes are larger, apparent lateral tilt, bullet occur for vertical extension spring
Spring geometric stiffness is unsatisfactory for linear conditions, therefore the vertical and torsion stiffness of Coupled Vibration System no longer keeps constant, but with
Amplitude is related, therefore causes unacceptable obvious errors to follow-up test result.Amplitude is bigger, and legacy system problem above is got over
Seriously, thus be not suitable for large amplitude free vibration test.It is generally acknowledged that when torsional amplitudes are within 2 °, error substantially can be with
Ignore.But for the twisting vibration situation for studying large amplitude, when being ruined such as the old bridge wind of Tacoma, torsional amplitudes reach surprising 35 °,
It can not be simulated at all using the free Three Degree Of Freedom coupling free vibration test device of tradition.
Invention content
The technical problem to be solved by the present invention is to be directed to wind tunnel test Bridge and other structural elements Segment Models three certainly
By the needs of degree coupling large amplitude free vibration, provide a kind of it is possible to prevente effectively from non-linear factor, guarantee three during experiment
Degree of freedom large amplitude Linear-free vibration testing device.Three Degree Of Freedom coupling free vibration flow tunnel testing device includes implosion test
Model, rigid rod, rigid arm, with reeded circular arc block, high-strength light cord, fixed pulley and linear stretch spring.
Technical scheme of the present invention：
A kind of Three Degree Of Freedom large amplitude free vibration flow tunnel testing device, including implosion test model 1, rigid round bar 2, just
Property arm 3, with reeded circular arc block 4, the first high-strength light cord 5, the first linear extension spring 6, the first fixed pulley 7,
Two high-strength light cords 8, the second linear stretch spring 9, the second fixed pulley 10 and bearing 11；1 both ends of implosion test model consolidate
Rigid round bar 2, rigid round bar 2 pass perpendicularly through the center of rigid arm 3 and are secured to, and ensure that implosion test model 1 reverses
Center line and 2 axis of rigid round bar, 3 centerline collineation of rigid arm；Two are separately fixed at rigidity with reeded circular arc block 4 hangs
The both ends of arm 3, two with the center that the center of circle that reeded circular arc block 4 is formed is rigid arm 3；First high-strength light cord 5
Symmetrically bypassing with reeded circular arc block 4,5 upper end of the first high-strength light cord is connect with the first linear 6 lower end of extension spring,
First high-strength light cord, 5 lower end ensures Three Degree Of Freedom large amplitude free vibration with being fixed with reeded 4 bottom of circular arc block
The first high-strength light cord 5 with reeded circular arc block 4 with only occurring relative rolling and the safety of the device in journey；The
One high-strength light cord 5 passes through the first fixed pulley 7, ensures implosion test model 1 when lateral vibration occurs, the first linear stretch
Spring 6 remains vertical state without lateral tilt；Second high-strength light cord, 8 upper end and the second linear stretch spring
9 lower ends connect, and around the second fixed pulley 10, lower end is connect with the bearing 11 being sleeved on rigid round bar 2, and bearing 11 is around rigid circle
Bar 2 rotates freely, and ensures implosion test model 1 during lateral vibration, and the second linear stretch spring 9 only occurs vertically flexible
Deformation, meets lateral rigidity linear conditions.
The length of the rigid arm 3 and diameter with reeded circular arc block 4 are according to the matter of implosion test model 1
Amount, the quality moments of inertia and torsional frequency are determined with erecting the ratio of curved frequency, generally in the range of 0.2m-1.5m.
First fixed pulley 7 and the second fixed pulley 10 respectively with the first high-strength light cord 5 and the second high-strength light
The friction coefficient of cord 8 is as small as possible, and when ensureing to occur Three Degree Of Freedom coupled vibrations, system damping ratio is as small as possible；Meanwhile
Two the first fixed pulleys 7 of the first high-strength light cord 5 are limited under conditions of rotation is not influenced, apart from as small as possible, i.e.,
The space of one high-strength light cord 5 lateral movement is as small as possible, it is ensured that the first high-strength light cord 5 of the first more than 7 fixed pulley
Vertical state is kept as far as possible so that the first linear extension spring 6 only has vertical dilatation.Second high-strength light is thin
Rope 8 in tension, ensures that the second linear stretch spring 9 is in linear elasticity state always always.
First fixed pulley 7 will have sufficiently long vertical distance, the second fixed pulley 10 and bearing 11 with rigid arm 3
There is sufficiently long horizontal distance, thus reduce vertical and lateral vibration as far as possible respectively to lateral and vertical rigidity influence.
Beneficial effects of the present invention：Bridge rigid model Three Degree Of Freedom is coupled by substantially free vibration displacement by fixed pulley
It is converted into the vertical linear stretch deformation of spring, it is ensured that in model vibration processes, lateral tilt does not occur for spring, and without considering
The uncertain influence that lateral springs are brought, meets linear geometry rigidity condition.In addition, during free vibration Hookean spring drawing
It is constant to stretch rigidity, mass of system and the quality moments of inertia are constant, and the arm of force is also constant, therefore system is vertical, torsion and lateral rigidity and shakes
Dynamic frequency all remains unchanged in entire vibration processes, and it is several caused by tilting to successfully avoid spring during conventional method is tested
The uncertain influence that non-linear and linear Stiffness problem and lateral springs dead weight are brought.Compared to traditional Three Degree Of Freedom
Free vibration test device, the experimental rig have following obvious advantage：(1) cancel traditional lateral springs, use instead Vertical Spring,
Sufficiently long high-strength light cord realizes the simulation of lateral ideal linearity rigidity with fixed pulley,；(2) using Vertical Spring, foot
Enough long high-strength light cords avoid tradition from only having the lateral vibration that Vertical Spring generates with fixed pulley；(3) since cord is enough
Long, vertical and torsional displacement can ignore lateral stiffness effect, and lateral displacement can ignore the influence of vertical and torsion stiffness,
Therefore can substantially reduce substantially vibrate bring it is various non-linear；(4) original Vertical Spring and arm connection mode are changed
Into both ends add an arc section, and substantially twisting vibration occurs even if thereby guaranteeing that, cord and Vertical Spring remain linear firm
Degree, while ensure that torsion stiffness is constant；(5) it is simulated because of reliable sidewise restraint and lateral rigidity, conventional method is used
Lower Vertical Spring can cancel, restrictive condition suffered by upper Vertical Spring type selecting is less, therefore more convenient.
Description of the drawings
Fig. 1 is the structural map of bridge rigid model Three Degree Of Freedom coupling free vibration flow tunnel testing device.
In figure：1 implosion test model；2 rigid round bars；3 rigid arms；4 with reeded circular arc block；5
First high-strength light cord；6 first linear extension springs；7 first fixed pulleys；8 second high-strength lights
Cord；9 second linear stretch springs；10 second fixed pulleys；11 bearings.
Specific embodiment
Below in conjunction with the specific embodiment of technical solution and attached drawing, in detail the narration present invention.
As shown in Figure 1, a kind of Three Degree Of Freedom coupling large amplitude free vibration flow tunnel testing device, including implosion test model
1st, rigid round bar 2, rigid arm 3, with reeded circular arc block 4, the first high-strength light cord 5, the first linear extension spring 6,
First fixed pulley 7, the second high-strength light cord 8,9 second fixed pulley 10 of the second linear stretch spring and bearing 11.Implosion test
The rigid round bar 2 of 1 both ends of model consolidation, rigid round bar 2 passes perpendicularly through the center of rigid arm 3 and is secured to, and ensures rigidity
1 centre of twist line of test model and 2 axis of rigid round bar, 3 centerline collineation of rigid arm；Two divide with reeded circular arc block 4
It is not fixed on the both ends of rigid arm 3, two with the center that the center of circle that reeded circular arc block 4 is formed is rigid arm 3；First
High-strength light cord 5 is symmetrically bypassed with reeded circular arc block 4,5 upper end of the first high-strength light cord and the first linear stretch
6 lower end of spring connects, and 5 lower end of the first high-strength light cord ensures that Three Degree Of Freedom is big with being fixed with reeded 4 bottom of circular arc block
The first high-strength light cord 5 with reeded circular arc block 4 with only occurring relative rolling and the dress during amplitude free vibration
The safety put；First high-strength light cord 5 passes through the first fixed pulley 7, ensures that lateral vibration is occurring for implosion test model 1
When, the first linear extension spring 6 remains vertical state without lateral tilt；Second high-strength light cord, 8 upper end with
Second linear stretch spring, 9 lower end connects, and around the second fixed pulley 10, lower end is connect with the bearing 11 being sleeved on rigid round bar 2,
Bearing 11 can be rotated freely around rigid round bar 2, ensure implosion test model 1 during lateral vibration, the second linear stretch
Vertical dilatation only occurs for spring 9, meets lateral rigidity linear conditions.
Claims (8)
- A kind of 1. Three Degree Of Freedom large amplitude free vibration flow tunnel testing device, which is characterized in that the bridge Three Degree Of Freedom coupling Large amplitude free vibration flow tunnel testing device is closed to include implosion test model (1), rigid round bar (2), rigid arm (3), carry The circular arc block (4) of groove, the first high-strength light cord (5), the first linear extension spring (6), the first fixed pulley (7), second are gently The high-strength cord of matter (8), the second linear stretch spring (9), the second fixed pulley (10) and bearing (11)；Implosion test model (1) two The rigid round bar (2) of end consolidation, rigid round bar (2) pass perpendicularly through the center of rigid arm (3) and are secured to, and ensure rigidity examination Test model (1) centre of twist line and rigid round bar (2) axis, rigid arm (3) centerline collineation；Two with reeded circular arc block (4) both ends of rigid arm (3) are separately fixed at, two with the center of circle that reeded circular arc block (4) is formed be rigid arm (3) Center；First high-strength light cord (5) is symmetrically bypassed with reeded circular arc block (4), on the first high-strength light cord (5) End is connect with the first linear extension spring (6) lower end, the first high-strength light cord (5) lower end and with reeded circular arc block (4) Bottom is fixed, ensure Three Degree Of Freedom large amplitude free vibration during the first high-strength light cord (5) with reeded circular arc Relative rolling and the safety of the device only occur for block (4)；First high-strength light cord (5) across the first fixed pulley (7), Ensure implosion test model (1) when lateral vibration occurs, the first linear extension spring (6) remains vertical state without sending out Raw lateral tilt；Second high-strength light cord (8) upper end is connect with second linear stretch spring (9) lower end, the second high-strength light Cord (8) connect around the second fixed pulley (10), lower end with the bearing (11) being sleeved on rigid round bar (2), and bearing (11) is around firm Property round bar (2) rotate freely, friction it is as small as possible, ensure implosion test model (1) during lateral vibration, second stretch bullet Vertical dilatation only occurs for spring (10), meets lateral rigidity linear conditions.
- 2. Three Degree Of Freedom large amplitude free vibration flow tunnel testing device according to claim 1, which is characterized in that described The length of rigid arm (3) and diameter with reeded circular arc block (4) are used to according to quality, the quality of implosion test model (1) Square and torsional frequency are determined with erecting the ratio of curved frequency, are controlled in the range of 0.2m-1.5m.
- 3. Three Degree Of Freedom large amplitude free vibration flow tunnel testing device according to claim 1 or 2, which is characterized in that the One fixed pulley (7) and the second fixed pulley (10) rub respectively with the first high-strength light cord (5) and second high-strength light cord (8) It is as small as possible to wipe coefficient, when ensureing to occur Three Degree Of Freedom coupled vibrations, system damping ratio is as small as possible；Meanwhile limitation first is light Two the first fixed pulleys (7) of the high-strength cord of matter (5) are not under conditions of rotation is influenced, apart from as small as possible, i.e. the first lightweight The space of high-strength cord (5) lateral movement is as small as possible, it is ensured that the first more than first fixed pulley (7) high-strength light cord (5) Vertical state is kept as far as possible so that the first linear extension spring (6) only has vertical dilatation.
- 4. Three Degree Of Freedom large amplitude free vibration flow tunnel testing device according to claim 1 or 2, which is characterized in that institute The the second high-strength light cord (8) stated in tension, ensures that the second linear stretch spring (9) is in linear bullet always always Character state.
- 5. Three Degree Of Freedom large amplitude free vibration flow tunnel testing device according to claim 3, which is characterized in that described Second high-strength light cord (8) in tension, ensures that the second linear stretch spring (9) is in linear elasticity shape always always State.
- 6. the bridge Three Degree Of Freedom coupling large amplitude free vibration flow tunnel testing device according to claim 1,2 or 5, special Sign is, first fixed pulley (7) and rigid arm (3) will have a sufficiently long vertical distance, the second fixed pulley (10) with Bearing (11) will have sufficiently long horizontal distance, thus reduce vertical and lateral vibration as far as possible respectively to lateral and vertical rigidity Influence.
- 7. bridge Three Degree Of Freedom according to claim 3 couples large amplitude free vibration flow tunnel testing device, feature exists In first fixed pulley (7) will have sufficiently long vertical distance, the second fixed pulley (10) and bearing with rigid arm (3) (11) there is sufficiently long horizontal distance, thus reduce vertical and lateral vibration as far as possible respectively to lateral and vertical rigidity shadow It rings.
- 8. bridge Three Degree Of Freedom according to claim 4 couples large amplitude free vibration flow tunnel testing device, feature exists In first fixed pulley (7) will have sufficiently long vertical distance, the second fixed pulley (10) and bearing with rigid arm (3) (11) there is sufficiently long horizontal distance, thus reduce vertical and lateral vibration as far as possible respectively to lateral and vertical rigidity shadow It rings.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207925A (en) * | 2019-06-28 | 2019-09-06 | 大连理工大学 | Natural wind field Bridge large amplitude is vertical and twisted coupling free vibration test device |
| WO2019169545A1 (en) * | 2018-03-06 | 2019-09-12 | 大连理工大学 | Three-degree-of-freedom large amplitude free vibration wind tunnel test device |
| CN111238761A (en) * | 2020-02-06 | 2020-06-05 | 大连理工大学 | Coupling free vibration wind tunnel test device with adjustable torsional vibration frequency ratio and vertical bending vibration frequency ratio |
| CN112098041A (en) * | 2020-08-18 | 2020-12-18 | 南京航空航天大学 | Rigidity adjusting device of wing low-speed flutter wind tunnel test model |
| CN112161774A (en) * | 2020-11-03 | 2021-01-01 | 长安大学 | Wind tunnel experiment device for three-degree-of-freedom coupled vibration under large wind attack angle |
| CN112461490A (en) * | 2020-11-17 | 2021-03-09 | 重庆大学 | Wind tunnel free vibration test device for large-attack-angle bridge section model |
| US11371908B2 (en) | 2020-02-06 | 2022-06-28 | Dalian University Of Technology | Wind tunnel testing device for torsional-vertical coupled free vibration with adjustable frequency ratio |
| CN115655635A (en) * | 2022-12-14 | 2023-01-31 | 中国空气动力研究与发展中心高速空气动力研究所 | Two-freedom-degree supporting system for full-body freedom-degree flutter or gust test |
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| US10900865B2 (en) | 2018-03-06 | 2021-01-26 | Dalian University Of Technology | Experimental setup for three-degree-of-freedom large-amplitude free vibration in wind tunnel test |
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| CN112098041B (en) * | 2020-08-18 | 2021-08-06 | 南京航空航天大学 | Rigidity adjusting device of wing low-speed flutter wind tunnel test model |
| CN112098041A (en) * | 2020-08-18 | 2020-12-18 | 南京航空航天大学 | Rigidity adjusting device of wing low-speed flutter wind tunnel test model |
| CN112161774A (en) * | 2020-11-03 | 2021-01-01 | 长安大学 | Wind tunnel experiment device for three-degree-of-freedom coupled vibration under large wind attack angle |
| CN112461490A (en) * | 2020-11-17 | 2021-03-09 | 重庆大学 | Wind tunnel free vibration test device for large-attack-angle bridge section model |
| CN115655635A (en) * | 2022-12-14 | 2023-01-31 | 中国空气动力研究与发展中心高速空气动力研究所 | Two-freedom-degree supporting system for full-body freedom-degree flutter or gust test |
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