CN102146980B - Rigid sectional model damp continuous regulating device for wind-tunnel test - Google Patents
Rigid sectional model damp continuous regulating device for wind-tunnel test Download PDFInfo
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- CN102146980B CN102146980B CN 201110002266 CN201110002266A CN102146980B CN 102146980 B CN102146980 B CN 102146980B CN 201110002266 CN201110002266 CN 201110002266 CN 201110002266 A CN201110002266 A CN 201110002266A CN 102146980 B CN102146980 B CN 102146980B
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Abstract
The invention relates to a rigid sectional mold damp continuous regulating device for a wind-tunnel test. The device comprises a sectional mold, wherein two ends of the sectional mold are respectively and fixedly connected with two rigid connecting rods correspondingly; two ends of each rigid connecting rod are respectively connected with corresponding springs; the upper end of each spring is fixedly connected with an intrinsic boundary, and the lower end of each spring is connected with a base. The device is characterized in that the end part of the rigid connecting rod is provided with an electric magnetic damper regulator. According to the invention, through continuously regulating the input current, the continuous regulating of the ratio of the vertical damping to the torsion damping of the sectional mold system is realized, so that the debugging process of the damping ratio is simplified, and the problem of unstable damping ratio in the test process is avoided.
Description
Technical field
The present invention relates to a kind of wind tunnel test device, specifically is a kind of wind tunnel test rigidity sections model damping continuous regulating mechanism.
Background technique
Bridge in the world just towards longspan, softly change direction and develop; Wind load becomes the bridge structure safe key for design factor that guarantees; For example as far back as 1940, the charming appearance and behaviour flutter that shock bridge circle the taken place the U.S.'s old Tacoma straits suspension bridge incident of collapsing, and serious vertical whirlpool has just taken place and has swashed resonance phenomenon in its its girder before flutter failure takes place under very low wind speed; It is documented; Serious vertical vortex-induced vibration has just taken place before ruining in Tacoma bridge wind under the wind speed of 1.4～2.0m/s, maximum bilateral amplitude reaches 76cm, and the wind speed interval that the whirlpool shakes lasts till 15.6m/s always.At present, comprise theory analysis, wind tunnel test, CFD numerical simulation, four kinds of means of field measurement for the shake research of performance of the wind of planning to build or accomplished bridge; Wherein wind tunnel test is topmost research means, is divided into full-bridge gas bullet model wind tunnel test and rigidity sections model wind tunnel test, and full-bridge gas bullet model wind tunnel test has not only been simulated the aerodynamic configuration of bridge; Also having simulated a series of dynamic propertys such as quality, rigidity, frequency and damping of bridge, is shake in different phase whirlpools such as construction, the operations important means of characteristic of research bridge, but owing to gas bullet model need satisfy various conditions of similarity; It is complicated to make Model Design make; Ratio is less, and the reynolds' number problem is outstanding, and expense is high; Test period is long, and application is restricted.
Because during the bridge wind-induced vibration, girder is main energy-absorbing member, and rigidity sections model only need with member geometric similarities such as real bridge girder, bridge tower, arch rib, cable, so make simply, expense is lower, uses commonplace.And study the wind-induced vibration of real bridge through rigid bridge beam sections model wind tunnel test; The damping ratio of sections model system comprises whether the damping ratio of the crooked vibration shape and the damping ratio of reversing the vibration shape are consistent with real bridge; Be related to wind such as the flutter that whether can accurately predict bridge member, the galloping critical wind velocity performance of shaking; Be related to the real bridge of whether accurately quantitative estimation whirlpool and swash the resonance amplitude, most important to rigidity sections model wind tunnel test result's confidence level.
The adjusting of sections model system damping ratio does not at present have a kind of uniform way; The general modes such as mechanical friction, rubber bar that adopt are carried out; But the method neither one of similar above-mentioned adjustment damping quantitative in addition adjustment criteria qualitatively, in order to reach accurately consistent, can only take the method for repeatedly attempting with the target damping ratio; There is the problem of adjustment overlong time, increased experimentation cost.In addition; In the test that requires low damping, owing to the additional facilities of modes such as above-mentioned mechanical friction, rubber bar itself, increased the damping of sections model system as contact-type through regular meeting; Make that the damping lower limit of system itself is excessive, can't realize lower target damping value; In the test of research damping ratio to structural vibration, because the damping ratio and the amplitude of sections model system are closely related, and the mechanical damping of system is difficult to keep constant in the model vibration processes, makes the test result confidence level reduce; Particularly when needs were regulated damping ratio in the larger context continuously, above-mentioned damping regulative mode was infeasible basically.
Summary of the invention
The technical problem that the present invention will solve is; Defective to the existing technology existence; A kind of wind tunnel test rigidity sections model damping continuous regulating mechanism is provided, can regulate continuously in the wind tunnel test flexural damping than and reverse damping ratio, and keep in the process of the test damping ratio stable.
For realizing above-mentioned purpose; The technological scheme that the present invention adopted is; Said wind tunnel test rigidity sections model damping continuous regulating mechanism comprises the sections model, and sections model two ends are fixedly connected with two rigid links are corresponding respectively, and every rigid links two ends connect with corresponding spring respectively; The lower end of each spring links to each other with substrate with the fixed connection of intrinsic border in each spring upper end, in said rigid links end the electromagnetic damping regulator is housed.
Below the present invention made further specify.
A kind of structure of said electromagnetic damping regulator is, it comprises the rectangular ring silicon steel core of copper sheet and band opening, is wound with coil on the silicon steel core, and coil links to each other through the power supply of lead with can regulate electric current size, and the relative substrate of silicon steel core is fixed; The copper sheet that the top links to each other with said rigid links end place said silicon steel core opening and relatively this magnetic core opening move up and down.
Further, the lower end of each spring links to each other with substrate through force transducer.
Further, an electromagnetic damping regulator is equipped with at every rigid links two ends.
Electromagnetic damping regulator among the present invention is a kind of electric convolution device; When vertical or torsional vibration take place in the sections model; The copper sheet that is cemented on the rigid links moves in the magnetic field that the silicon steel core opening is produced by hot-wire coil; Copper sheet will receive a counter-force that hinders its motion, the vibrational energy of the sections model system mode with foucault current in the copper sheet dissipated, thereby reach the purpose of the damping ratio that increases the sections model system; And the size of this energy dissipation be looped around silicon steel core on factor such as coil current size, coil turn, silicon steel core A/F size, copper sheet thickness relevant; More adjustable continuously through the system damping of the big I envoy's segment model of single adjustment input current than within the specific limits; Through the adjustment coil turn, silicon steel core A/F size, copper sheet thickness can be adjusted the CLV ceiling limit value of damping ratio.
The present invention is applicable to wind tunnel test two dimension sections model system flexural damping and the continuous adjusting of reversing damping as a kind of damping ratio controlling device, and the advantage that it is compared with existing technology has:
1, wind tunnel test rigidity sections model damping continuous regulating mechanism of the present invention; Can realize sections model system flexural damping is compared and reverses the continuous adjusting of damping ratio through the input of adjustment foreign current; And when externally power supply does not have input; System's inherent damping reaches 0.1% than minimum, for the sections model system provides extremely low damping ratio lower limit;
2, wind tunnel test rigidity sections model damping continuous regulating mechanism of the present invention, the size of system damping ratio and amplitude are irrelevant, and damping ratio is stable;
3, wind tunnel test rigidity sections model damping continuous regulating mechanism of the present invention has been realized separating fully of rigidity and damping; Damping force becomes accurate linear relationship with the movement velocity of sections model system, regulates damping ratio the frequency of said sections model system is not almost had any interference.
4, wind tunnel test rigidity sections model damping continuous regulating mechanism of the present invention is high to the adjusting efficient of sections model system damping ratio, only needs to regulate foreign current input size and can realize the target damping ratio, has saved test period greatly.
Description of drawings
Fig. 1 is a structural representation of the present invention,
Fig. 2 is an electromagnetic damping controller structure schematic representation.
In the drawings:
The 1-intermediate plate, the 2-silicon steel core, the 3-coil,
The 4-copper sheet, the 5-bolt, the 6-force transducer,
7-sections model, the 8-rigid links, the 9-spring,
The intrinsic border of 10-, the 11-substrate.
Embodiment
Like Fig. 1, shown in Figure 2, with two rigid links, 8 corresponding fixed connections, every rigid links 8 two ends connect with corresponding spring 9 respectively respectively at sections model 7 two ends; The lower end of each spring 9 links to each other with substrate 11 through force transducer 6 with 10 fixed connections of intrinsic border in each spring 9 upper end, and an electromagnetic damping regulator that comprises the copper sheet 4 and the rectangular ring silicon steel core 2 of band opening is equipped with at every rigid links 8 two ends.
Be wound with coil 3 on the silicon steel core 2, coil 3 links to each other through the power supply of lead with can regulate electric current size, and silicon steel core 2 relative substrates 11 are fixed; The copper sheet 4 that the top links to each other with rigid links 8 ends place said silicon steel core 2 openings and relatively these silicon steel core 2 openings move up and down.
Regulate the electric current of outside regulated power supply and import the size of current in the corresponding change hot-wire coil 3 of big I; Thereby the magnitude of field intensity of can regulate silicon steel core 2 openings; When vertical or torsional vibration take place in sections model 7; The copper sheet 4 that is cemented on the connecting rod 8 will cut the magnetic line of force in silicon steel core 2 opening magnetic fields so that in copper sheet 4, produce foucault current, and the vibration that hinders sections model 7 is to reach the purpose that increases corresponding vibration shape damping ratio, and outside input current is big more; The magnetic intensity of silicon steel core 2 openings is big more, and the electromagnetic damping of sections model 7 systems is also just big more.Through continuous adjusting foreign current input size, can realize the adjustable continuously of sections model system damping ratio.
Claims (4)
1. a wind tunnel test rigidity sections model damping continuous regulating mechanism comprises sections model (7), and said sections model (7) two ends are fixedly connected with two rigid links (8) are corresponding respectively, and the same respectively corresponding spring in every rigid links (8) two ends (9) connect; The same substrate in lower end (11) of each spring (9) links to each other with intrinsic border (10) fixed connection in each spring (9) upper end, it is characterized in that, in said rigid links (8) end the electromagnetic damping regulator is housed.
2. according to the said wind tunnel test rigidity of claim 1 sections model damping continuous regulating mechanism; It is characterized in that; Said electromagnetic damping regulator comprises the rectangular ring silicon steel core (2) of copper sheet (4) and band opening; Be wound with coil (3) on the silicon steel core (2), coil (3) links to each other through the power supply of lead with can regulate electric current size, and silicon steel core (2) substrate (11) relatively is fixed; The copper sheet (4) that the top links to each other with said rigid links (8) end place said silicon steel core (2) opening and relatively this silicon steel core (2) opening move up and down.
3. according to the said wind tunnel test rigidity of claim 1 sections model damping continuous regulating mechanism, it is characterized in that the lower end of each spring (9) links to each other through the same substrate of force transducer (6) (11).
4. according to the said wind tunnel test rigidity of claim 1 sections model damping continuous regulating mechanism, it is characterized in that an electromagnetic damping regulator is equipped with at every rigid links (8) two ends.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110002266 CN102146980B (en) | 2011-01-07 | 2011-01-07 | Rigid sectional model damp continuous regulating device for wind-tunnel test |
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| CN 201110002266 CN102146980B (en) | 2011-01-07 | 2011-01-07 | Rigid sectional model damp continuous regulating device for wind-tunnel test |
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| CN102146980B true CN102146980B (en) | 2012-12-05 |
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| CN110207925B (en) * | 2019-06-28 | 2023-12-29 | 大连理工大学 | Large-amplitude vertical and torsional coupling free vibration test device for bridge in natural wind field |
| CN110455489B (en) * | 2019-08-09 | 2021-03-19 | 东南大学 | Wind tunnel test device for measuring surface wind pressure of bridge section vibration 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 |
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| CN112945514B (en) * | 2021-01-29 | 2022-06-24 | 同济大学 | Bridge segment model wind tunnel test suspension system based on magnetic suspension principle |
| CN116070333B (en) * | 2023-03-16 | 2023-06-06 | 石家庄铁道大学 | Stay cable aerodynamic force analysis method, system and terminal considering Reynolds number effect |
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| JP2000275137A (en) * | 1999-03-25 | 2000-10-06 | Sumitomo Heavy Ind Ltd | Attenuation addition apparatus for wind tunnel test |
| CN101660965A (en) * | 2008-08-27 | 2010-03-03 | 李岭群 | Magnetic-suspension magnetomotive omnidirectional turning natural wind tunnel |
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Effective date of registration: 20211130 Address after: 410082 Yuelu District Lushan South Road Lushan Gate, Changsha City, Hunan Province Patentee after: HUNAN University Patentee after: China Construction Fifth Engineering Bureau Co., Ltd Address before: 410082 Hunan province Changsha Lushan Road No. 2 Patentee before: HUNAN University |
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