CN104089753A - Tester used for measuring stress of flexible objects in low-speed wind tunnel and testing method thereof - Google Patents
Tester used for measuring stress of flexible objects in low-speed wind tunnel and testing method thereof Download PDFInfo
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- CN104089753A CN104089753A CN201410321180.3A CN201410321180A CN104089753A CN 104089753 A CN104089753 A CN 104089753A CN 201410321180 A CN201410321180 A CN 201410321180A CN 104089753 A CN104089753 A CN 104089753A
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- 229910052782 aluminium Inorganic materials 0.000 description 1
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Abstract
The invention discloses a tester used for measuring the stress of flexible objects in a low-speed wind tunnel and a testing method of the tester. The tester comprises a supporting frame, two strain balances and two supporting rods, wherein the balances and the supporting rods are connected into a whole through flanges and arranged on the supporting frame in space in a crossed mode, and kinematics characteristics of the flexible objects are shot through a high-speed camera in combination with laser sheet laser sources. Meanwhile, a data collecting system is used for collecting balance signals for analyzing the stress characteristic of the flexible objects, so that the vibration amplitude, the vibration frequency, the vibration mode, the stress and other information of the flexible objects are obtained. The stress of a single flexible object or the multiple flexible objects under interaction can be dynamically measured, in the process of measuring the stress, a high-speed shooting system can be used for shooting the swinging process of the flexible objects synchronously, and the requirement for measuring the stress of the flexible objects is met.
Description
Technical field
The present invention relates to wind tunnel force measurement test field, especially relate to a kind of test unit and method of testing thereof for the flexible thing dynamometry of low-speed wind tunnel.
Background technology
It is one of modal spontaneous phenomenon that flexible thing lets it flow in air, is also a solid coupled problem of typical stream.Similarly the solid coupling phenomenon of stream is seen everywhere in daily life and industrial and agricultural production.For example, after the paper of papermaking and the motion of press high speed or film are unstable, can tear, oral cavity soft palate and respiratory air flow effect meeting cause human body snoring, the success or failure of the stability influence oil transportation of aircraft air refueling probe, even the flight of the moving about of occurring in nature fish, birds is all the example of flexible body and fluid coupled motions.The solid coupled problem of stream of such quasi-representative, due to its unintentional nonlinearity feature, causes the broad research interest of Chinese scholars in recent years.
Stressed when measuring flexible thing unstability in air-flow and swinging has following difficult point: the stressed of flexible thing is dynamic change, and the Dynamic response of load-sensing unit be there are certain requirements; The stressed magnitude of flexible thing less (being generally tens to several hectograms), has higher requirements to the sensitivity of load-sensing unit; Flexible object model self can swing, so the interference that model supporting mechanism should avoid resonance to reduce again stream field is as far as possible also a difficult problem.
For conventional test device in low-speed wind tunnel, cannot realize the difficult problem to flexible thing dynamometry such as flexible boards, design a set of test unit for the flexible thing dynamometry of low-speed wind tunnel.This device is measured vibration frequency, amplitude and the vibration shape of flexible board by the image processing software of high-speed figure photographic apparatus and establishment voluntarily, by the force-bearing situation of small-sized balance measurement flexible board, this device provides a kind of means for furtheing investigate the solid coupling phenomenon of the stream of flexible board in uniform air flow.
Summary of the invention
The object of this invention is to provide a kind of test unit, make this device in low-speed wind tunnel, to the swing of flexible thing, to carry out kinetic measurement, and analyze.
The technical solution used in the present invention is: for the test unit of the flexible thing dynamometry of low-speed wind tunnel, comprise bracing frame, two strain balances and two poles, support frame as described above is comprised of base, framework and slide rail, is provided with a slide rail A on described base, on described framework with 90 of slide rail A
0on crisscross, be provided with slide rail B; Described two balances are arranged on respectively in the slideway of slide rail A and slide rail B; On described balance, connect respectively a pole, one end of described pole is provided with flexible thing.
In technique scheme, described pole adopts integral body to process, and pole profile is streamlined, and one end of pole is stiff end, and the other end of pole is bare terminal end, and described bare terminal end is provided with flexible thing.
In technique scheme, described pole stiff end is cylindrical, and the cross section of bare terminal end is aerofoil profile, and middle is the gradual transition section of cylinder to aerofoil profile.
In technique scheme, described bare terminal end is provided with for clamping the slit of installation along the plane of symmetry.
In technique scheme, between described balance and pole, by flange, be connected.
In technique scheme, described balance is electrodeless slip in slide rail, and can in slide rail, fix optional position.
The force measuring method of the flexible thing of a kind of low-speed wind tunnel, tunnel airstream is applied to aerodynamic force on the flexible thing of pole bare terminal end and is applied on balance by pole, the stressed output voltage signal that causes of balance changes, data collector gathers and processes balance voltage signal, obtains the aerodynamic loading information of flexible thing.
In said method, in dynamometry, utilize high-speed photography system to take the swing process of flexible thing, obtain the photo that a series of flexible things swing Temporal Evolution, along flexible thing position intercepting width, it is the fillet image of a pixel, these fillet images are become to piece image by time combined sequence, just obtain flexible thing at displacement-temporal evolution picture of this position, after processing, can obtain each position displacement of picture curve over time, to this curve, further analysis can obtain frequency and the amplitude information that flexible thing swings.
In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows: utilize this test unit can realize the dynamic force measurement under single and a plurality of flexible articles are interacted, during dynamometry, utilize high-speed photography system synchronously to the swing process of flexible thing, to take, and then can obtain the information such as amplitude, vibration frequency, the vibration shape of flexible thing.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is application example figure of the present invention;
Fig. 2 is the structural representation of balance and pole;
Fig. 3 is side force (lift) curve of balance;
Fig. 4 is normal force (resistance) curve of balance;
Fig. 5 is the rolling moment curve of balance;
Wherein: the 1st, wind-tunnel, the 2nd, bracing frame, the 3rd, LASER Light Source, the 4th, pole, the 5th, balance, the 6th, high-speed camera, the 7th, balance base.
Embodiment
Disclosed all features in this instructions, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
As shown in Fig. 1, test unit of the present invention is comprised of bracing frame 2 and the balance 5 and the pole 4 that are arranged on bracing frame 2; Bracing frame 2 is comprised of base, framework and slide rail, and slide rail comprises slide rail A and slide rail B, and its middle frame is arranged on base top and links together with base, and the framework part parallel with susceptor surface is set to slide rail A, and A becomes 90 with slide rail
0crisscrossly be provided with an one slide rail B, and slide rail B is arranged in susceptor surface.As shown in Figure 2, pole 4 is processed by aluminum alloy materials integral body, for taking into account intensity, also reduce the impact of stream field, pole 4 profiles are designed to streamlined as far as possible, and pole 4 stiff ends are cylinder, model bare terminal end cross section is NACA0020 aerofoil profile, aerofoil profile chord length 25mm, maximum ga(u)ge 5mm, the stage casing of pole 4 is the gradual transition section that cylinder arrives aerofoil profile, prop up rod model bare terminal end and along the plane of symmetry, processed the slit of wide 1mm, dark 150mm, for the clamping of flexible flag, install; Balance 5 is mounted in slide rail by balance base 6, and the present invention adopts two balances, and a balance is set separately in slide rail A and slide rail B; Between balance 5 and pole 4, by flange, be connected, to guarantee the right alignment between pole 4 and balance 5; The base of balance 5 can be done electrodeless slip by slide block in slide rail, and fixing at an arbitrary position, just can realize that two flags are parallel, serial, be staggered front to back the stressed measurement under ordered state, and capable of regulating its spacing is big or small by changing relative installation.
Balance 5 in the present invention is three-component rod-type strain force balance, length 125mm, diameter 15mm, three component strain unit of balance adopt series-mode frame, and three components are respectively side force (Fy), normal force (Fx), the rolling moment (Mx) under balance axle system.
As shown in Figure 1, by the test unit assembling by fixing support rack in wind-tunnel 1, during test, two balances 8 are arranged on respectively on two orthogonal aluminium section bar slide rails, the relative position of slide block by changing balance base 6 on slide rail, left and right and the longitudinal separation of two flag models can be changed, thereby the stressed measurement of two flags side by side, under serial, staggered state can be realized.
Data acquisition system (DAS) is partly comprised of signal condition equipment, data collecting card, collecting computer and software, supporting power supply etc.; Flexible object model is arranged on pole 4, the aerodynamic force that tunnel airstream is applied on model is applied on balance 5 by pole 4, cause the variation of balance 5 output voltage signals, balance signal carries out acquisition and processing by data acquisition system (DAS), finally obtains the aerodynamic loading information of flexible thing.The balance load voltage signal that in test, data acquisition system (DAS) is obtained, first after low-pass filtering, substitution balance formula obtains the curve of load of three components after changing.
In order to obtain the information such as the amplitude of oscillation, frequency, swing form of flexible thing simultaneously, in dynamometry, also utilize high-speed photography system to take the swing process of flexible thing, High Speed Photography Images is just processed and can be obtained corresponding kinematics information.High-speed photography system is by high-speed camera 6, LASER Light Source 3 and control accordingly computing machine etc. and partly form.With high-speed camera 6, photographed the photo that a series of flexible things swing Temporal Evolution, in picture, along flexible thing position intercepting width, be the fillet image (being equivalent to observe the swing of flexible thing after slit) of a pixel, these fillet images are become to piece image by time combined sequence, just obtain flexible board at displacement-temporal evolution picture of this position, it is done to further digitized processing, can obtain the displacement-time changing curve of each position of picture, to this curve, further analysis can obtain frequency and the amplitude information that flexible thing swings.In test, photographic images resolution is 1280pixel * 512pixel, and filming frequency is 1000FPS.
For the reliability of verification system, carried out proving test; Provided the flexible flag of 80mm * 80mm, some the type testing results during speed of incoming flow 11.75m/s of wind-tunnel wind:
By Fig. 3, Fig. 4, Fig. 5, can be found out, the change curve of three force components of flexible thing changes by sinusoidal rule.Respectively resistance, lift, M curve are carried out to spectrum analysis, the change frequency that rises force and moment is 36.8Hz, and change in resistance frequency is 73.6Hz, is 2 times of lift frequency.Displacement-time evolution that high-speed photography is obtained is carried out spectrum analysis, and the frequency obtaining is 36.8Hz, and dynamometer check result is in full accord.
The explanation of above-mentioned situation, this experimental system dynamometry experimental result can verify mutually with high-speed photography experimental result, and test findings rule is reasonable, and test macro can meet the requirement of flexible thing dynamometry.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.
Claims (8)
1. for a test unit for the flexible thing dynamometry of low-speed wind tunnel, it is characterized by and comprise bracing frame, two gentle two poles in sky, support frame as described above is comprised of base, framework and slide rail, is provided with a slide rail A on described base, on described framework with 90 of slide rail A
0on crisscross, be provided with slide rail B; Described two balances are arranged on respectively in the slideway of slide rail A and slide rail B; On described balance, connect respectively a pole, one end of described pole is provided with flexible thing.
2. a kind of test unit for the flexible thing dynamometry of low-speed wind tunnel according to claim 1, it is characterized by described pole and adopt integral body to process, pole profile is streamlined, and one end of pole is stiff end, the other end of pole is bare terminal end, and described bare terminal end is provided with flexible thing.
3. a kind of test unit for the flexible thing dynamometry of low-speed wind tunnel according to claim 2, it is characterized by described pole is cylindrical from stiff end, the cross section of bare terminal end is aerofoil profile.
4. a kind of test unit for the flexible thing dynamometry of low-speed wind tunnel according to claim 3, is characterized by described bare terminal end and is provided with for clamping the slit of installation along the plane of symmetry.
5. a kind of test unit for the flexible thing dynamometry of low-speed wind tunnel according to claim 1, is characterized by between described balance and pole and is connected by flange.
6. a kind of test unit for the flexible thing dynamometry of low-speed wind tunnel according to claim 1, is characterized by the electrodeless slip in slide rail of described balance, and can in slide rail, fix optional position.
7. the force measuring method of the flexible thing of a low-speed wind tunnel, it is characterized in that: tunnel airstream is applied on the flexible thing of pole bare terminal end, the suffered aerodynamic force of flexible thing is applied on balance by pole, the stressed output voltage signal that causes of balance changes, data collector gathers and processes balance voltage signal, obtains the aerodynamic loading information of flexible thing.
8. the force measuring method of the flexible thing of a kind of low-speed wind tunnel according to claim 7, it is characterized in that: in dynamometry, utilize high-speed photography system and laser light sheet to take the swing process of flexible thing, obtain the photo that a series of flexible things swing Temporal Evolution, along photo position intercepting width, it is the fillet image of a pixel, these fillet images are become to piece image by time combined sequence, just obtain flexible thing at displacement-temporal evolution picture of this position, after processing, can obtain each position displacement of flexible thing curve over time, to this curve, further analysis can obtain frequency and the amplitude information that flexible thing swings.
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| CN201410321180.3A CN104089753A (en) | 2014-07-08 | 2014-07-08 | Tester used for measuring stress of flexible objects in low-speed wind tunnel and testing method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675192A (en) * | 2014-11-19 | 2016-06-15 | 中国航空工业集团公司西安飞机设计研究所 | Electromagnetic pulse force measuring method and electromagnetic pulse force measuring device |
| CN105784314A (en) * | 2016-03-04 | 2016-07-20 | 中国空气动力研究与发展中心低速空气动力研究所 | Low-speed wind tunnel virtual flying experimental support device |
| CN106768800A (en) * | 2016-12-02 | 2017-05-31 | 中国航空工业集团公司沈阳空气动力研究所 | A kind of model supporting device for multiple aircraft formation wind tunnel test |
| CN107290124A (en) * | 2017-06-26 | 2017-10-24 | 西南交通大学 | A kind of pulse-combustion wind-tunnel suspension type dynamometric system |
| CN108844710A (en) * | 2018-07-13 | 2018-11-20 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of icing wind tunnel test ice shape measurement method |
| CN111024356A (en) * | 2019-11-25 | 2020-04-17 | 中国运载火箭技术研究院 | Device and method for measuring stress after eddy current caused by small-sized bulges on surface |
| CN112171628A (en) * | 2020-09-28 | 2021-01-05 | 中国空气动力研究与发展中心高速空气动力研究所 | Device for replacing solid spray pipe of high-speed wind tunnel |
| 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 |
| CN112798218A (en) * | 2021-04-12 | 2021-05-14 | 中国空气动力研究与发展中心低速空气动力研究所 | Model and rod balance connecting structure for wind tunnel test |
| CN115901051A (en) * | 2022-11-10 | 2023-04-04 | 哈尔滨工程大学 | Device and method for measuring net self-thrust of flexible plate in self-propelled state |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675192A (en) * | 2014-11-19 | 2016-06-15 | 中国航空工业集团公司西安飞机设计研究所 | Electromagnetic pulse force measuring method and electromagnetic pulse force measuring device |
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| CN105784314A (en) * | 2016-03-04 | 2016-07-20 | 中国空气动力研究与发展中心低速空气动力研究所 | Low-speed wind tunnel virtual flying experimental support device |
| CN106768800A (en) * | 2016-12-02 | 2017-05-31 | 中国航空工业集团公司沈阳空气动力研究所 | A kind of model supporting device for multiple aircraft formation wind tunnel test |
| CN107290124A (en) * | 2017-06-26 | 2017-10-24 | 西南交通大学 | A kind of pulse-combustion wind-tunnel suspension type dynamometric system |
| 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 |
| CN108844710A (en) * | 2018-07-13 | 2018-11-20 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of icing wind tunnel test ice shape measurement method |
| CN111024356A (en) * | 2019-11-25 | 2020-04-17 | 中国运载火箭技术研究院 | Device and method for measuring stress after eddy current caused by small-sized bulges on surface |
| CN112171628A (en) * | 2020-09-28 | 2021-01-05 | 中国空气动力研究与发展中心高速空气动力研究所 | Device for replacing solid spray pipe of high-speed wind tunnel |
| CN112798218A (en) * | 2021-04-12 | 2021-05-14 | 中国空气动力研究与发展中心低速空气动力研究所 | Model and rod balance connecting structure for wind tunnel test |
| CN115901051A (en) * | 2022-11-10 | 2023-04-04 | 哈尔滨工程大学 | Device and method for measuring net self-thrust of flexible plate in self-propelled state |
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Application publication date: 20141008 |