CN101551316B - Rheological characteristic measuring device of magnetorheological fluid under the condition of high-speed flow - Google Patents
Rheological characteristic measuring device of magnetorheological fluid under the condition of high-speed flow Download PDFInfo
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- CN101551316B CN101551316B CN2009100279983A CN200910027998A CN101551316B CN 101551316 B CN101551316 B CN 101551316B CN 2009100279983 A CN2009100279983 A CN 2009100279983A CN 200910027998 A CN200910027998 A CN 200910027998A CN 101551316 B CN101551316 B CN 101551316B
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Abstract
The invention relates to a rheological characteristic measuring device of magnetorheological fluid under the condition of high-speed flowing, consisting of an oil cylinder, a parallel plate flowing port device, a bracket, an exciting device and a recycling oil barrel; the parallel plate flowing port is inserted into a groove arranged at the bottom part of the oil cylinder and the parallel plate flowing port and the groove are fixed by the bracket; and the exciting device is arranged at the lower support plate of the bracket and is used for generating relatively uniform magnetic field; the recycling oil barrel is arranged below the parallel plate chute and used for recycling the magnetorheological fluid flowing out of the parallel plate chute. The rheological characteristic measuring deviceutilizes the working principle of venturi, leads the magnetorheological fluid to flow into a narrow-gap type parallel plate flowing port from a coarse oil cylinder, can realize ultra-high speed flow of the magnetorheological fluid, utilizes straight flowing (parallel plate flow port) of the fluid to measure, can be used for studying the rheological characteristic of the magnetorheological fluid under the condition of high-speed flowing and has simple structure and easy implementation.
Description
Technical field
The invention belongs to the measuring technique of the rheological characteristics of magnetic flow liquid, magnetic current and liquid flow variation characteristic measurement mechanism under particularly a kind of flow at high speed situation.
Background technology
Magnetic flow liquid is a kind of intellectual material, and magnetic flow liquid can change its viscosity rapidly adding under the action of a magnetic field in the time of millisecond magnitude, and this variation is reversible.The magnetorheological half active controllable damping unit that utilizes magnetic flow liquid to research and develop as actuating medium, because characteristics such as the Adjustable real-time of damping force joint, the response time are short, working temperature is big, electric energy that consume is little, Vehicle damper, structural seismic, and field such as machine-building obtained application more and more widely.
The rheological characteristics of magnetic flow liquid comprises that viscosity with relation of relation, yield stress and the magnetic field intensity of variation relation, yield stress and the shearing rate of shearing rate etc., is that magnetic flow liquid substantially the most also is the characteristic of most critical.To the degree of accuracy of magnetic current and liquid flow variation characteristic understanding, greatly affect the realization of the correct design of magnetorheological damping device and accurate control in the course of the work.
The measurement mechanism that has magnetic current and liquid flow variation characteristic under the multiple measurement low speed mobility status, wherein fundamental method is to transform on the flow graph that the common fluid rheological characteristics measures and upgrade in existing being used for, and perhaps utilizes the ultimate principle of common flow graph to redesign.
Patent " test macro of magnetic current and liquid flow variation characteristic " (application number 01113648.0) has been described a kind of measurement mechanism that utilizes upper and lower two isometrical disk generation relative rotary motion, measures liquid rheology liquid flow variation characteristic by the measurement moment of torsion.
The common fluid flow graph that patent " magnetic current and liquid flow variation characteristic measuring system " (application number 200510029654.8) is produced based on Britain MALVERN company, proposed a kind of new magnetic current and liquid flow variation characteristic measurement mechanism, measured the characterisitic parameter of magnetic flow liquid but utilize to rotatablely move equally.
United States Patent (USP) " Electrorheological and magnetorheological fluid scanning rheometer " (6564618) has been advised a kind of measurement mechanism (flow graph) that is similar to the magnetic flow liquid viscosity and the yield stress of capillary pipe structure, apply magnetic field at extracapillary, by measuring liquid-column height and utilizing the visco-plasticity model of magnetic flow liquid to calculate the rheological characteristics of magnetic flow liquid.At the bottom of the magnetic flow liquid flow velocity utmost point that this measuring method obtains, shearing rate is very little.
The apparatus and method of these existence can not solve the problems of measurement of magnetic current and liquid flow variation characteristic under the flow at high speed situation, and for example the maximum shear rate can reach 10 under no excitation situation
5s
-1The occasion of above magnitude left and right horizontal.
In recent years, the utilization of magnetic converting technique under the thump environment also makes the researcher produce keen interest, for example magnetorheological device is used for the Vehicular impact security protection system, and stressed when reducing Vehicular impact reduces the impact damage of vehicle; MR damper can also be used for the take-off and landing device of aircraft, shock load and level of vibration during with the reduction aircraft lands; Application in the recoil process control of cannon weapon is to reduce to act on the power on the weapon gun carriage.All carry out under the thump situation application scenario of these magnetic converting techniques, and magnetic flow liquid has taken place by flowing very at a high speed.Understand the rheological characteristics of magnetic flow liquid under flow at high speed and high shear rate situation, have important theory and practical significance for magnetic converting technique being expanded to the thump field.
Summary of the invention
The object of the present invention is to provide a kind of magnetic flow liquid that makes that swiftly flowing device takes place, be used to measure the rheological characteristics of magnetic flow liquid under flow at high speed and high shear rate situation.
The technical solution that realizes the object of the invention is: magnetic current and liquid flow variation characteristic measurement mechanism under a kind of flow at high speed situation, form by oil cylinder, parallel-plate head piece device, support, excitation unit and recovery oil drum, described parallel-plate head piece device is inserted in the groove of oil cylinder bottom, both are fixed by support jointly, excitation unit is placed on and is used for producing magnetic field relatively uniformly on the lower carrier plate of support, and make magnetic field penetration parallel-plate chute, reclaim oil drum be placed on the parallel-plate chute below, be used to reclaim the magnetic flow liquid that flows out from the parallel-plate chute; Parallel-plate head piece device is formed through bolt by back plate, header board, and offers rectangle parallel-plate chute on the plate of back, after two boards is fixing, reprocesses out a circular counter bore, and the oil jacket that goes out of oil cylinder inserts this counterbore, avoids magnetorheological overflowing.
The present invention compared with prior art, its remarkable advantage: (1) utilizes the principle of work of Venturi tube, allows magnetic flow liquid flow into a narrow slit type parallel-plate head piece in the thick oil cylinder, can realize that the hypervelocity of magnetic flow liquid flows, and for example reaches about 50m/s; Realize the ultra-high shear rate of magnetic flow liquid, for example reach the above magnitude of 105s-1.(2) utilize the streamlined flow (parallel-plate head piece) of fluid to measure, can be used to study the rheological characteristics of magnetic flow liquid under the hypervelocity mobility status.(3) simple in structure, implement easily.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is a magnetic current and liquid flow variation characteristic measurement mechanism structural representation under the flow at high speed situation of the present invention.
Fig. 2 is oil cylinder of the present invention and parallel-plate head piece apparatus structure synoptic diagram.
Fig. 3 is a parallel-plate head piece apparatus structure synoptic diagram of the present invention.
Fig. 4 is the formation structural representation of parallel-plate head piece of the present invention.
Fig. 5 is an oil cylinder cut-open view structural representation of the present invention.
Fig. 6 is a supporting structure synoptic diagram of the present invention.
Fig. 7 is the cut-open view of magnetic current and liquid flow variation characteristic measurement mechanism under the flow at high speed situation of the present invention.
Fig. 8 is an excitation unit structural representation of the present invention.
Embodiment
In conjunction with Fig. 1, the magnetic current and liquid flow variation characteristic measurement mechanism has utilized the principle of work of Venturi tube under the flow at high speed situation of the present invention: magnetic flow liquid is flowed through in the thicker oil cylinder and is flowed out behind the narrow slit type parallel-plate head piece, magnetic flow liquid has obtained very high flow velocity in the parallel-plate head piece, comprise oil cylinder 100, parallel-plate head piece device 200, support 300, excitation unit 400 and reclaim oil drum 500 compositions.Wherein, parallel-plate head piece device 200 is inserted in the groove interior (Fig. 2) of oil cylinder 100 bottoms, and both are fixed by support 300 jointly.Excitation unit is placed on that (Fig. 6) is used for producing magnetic field relatively uniformly on the lower carrier plate 305 of support 300, and makes magnetic field penetration parallel-plate chute 205 (Fig. 3, Fig. 4).Reclaim following (Fig. 7) that oil drum 500 is placed on parallel-plate chute 205, be used to reclaim the magnetic flow liquid that flows out from parallel-plate chute 205.
In conjunction with Fig. 3 and Fig. 4, parallel-plate head piece device 200 of the present invention comprises back plate 201, header board 202, they through bolt 203 and 204 fixing after, and on the plate 201 of back, offering rectangle parallel-plate chute 205.Two boards 201,202 is reprocessed out a circular counter bore 206 after bolt 203,204 is fixed, be used for matching with the oil jacket 109 (Fig. 5) that goes out of oil cylinder 100, and promptly the oil jacket 109 that goes out of oil cylinder 100 inserts these counterbores 206, avoids magnetorheological overflowing.Wherein, the diameter of oil cylinder 100 is much larger than the size of parallel-plate chute 205, and the diameter of oil cylinder 100 is 150～200mm, the size of parallel-plate chute 205 (1～2) x (10～20) mm.
In conjunction with Fig. 5, oil cylinder 100 of the present invention mainly comprises piston rod 101, piston 103, upper cylinder body 106, lower cylinder body 107 and goes out oil jacket 109 etc.Wherein, upper cylinder body 106 and lower cylinder body 107 are by being threaded togather.Packing ring 108 also is housed on the flange of upper cylinder body 106, and the bottom surface of the upper supporting plate 304 of this packing ring future and support 300 contacts, and promotes the secure fixation of 300 pairs of oil cylinders 100 of support and parallel-plate head piece device 200.Similar with common hydraulic cylinder, piston rod 101 and piston 103 are installed in the upper cylinder body 106, also have O-ring seal 104 on piston 103, play the sealing function of piston 103 in moving downward process.On piston 103, also have oiling spiral shell 105, oiling spiral shell 105 is opened, can between upper cylinder body 106 and lower cylinder body 107, inject magnetic flow liquid in the formed cavity through oil hole.Oil jacket 109 is installed out on lower cylinder body 107, and magnetic flow liquid flows into parallel-plate chute 205 through going out oil jacket 109.Go out the base plate of oil jacket 109 by bolt 111 and lower cylinder body 107 and link together,, go out oil jacket and also be pressed with O-ring seal 110 109 times in order to guarantee sealing.Go out oil jacket 109 after installing on the lower cylinder body 107, have part pipe shape to protrude in the bottom of lower cylinder body 107, purpose is match with the circular counter bore 206 of parallel-plate head piece device (Fig. 7).Oil cylinder 100 has end cap 102, plays the guide effect to piston rod 101, has bleeder vent at end cap 102.
In conjunction with Fig. 6, support 300 of the present invention is used for support cylinder 100 and parallel-plate head piece device 200.Support 300 comprises pillar 301, nut 302, nut 303, upper supporting plate 304, lower carrier plate 305, base 306 etc.Upper supporting plate 304 with holes is pressed on the upper end of pillar 301 by nut 302, and lower carrier plate 305 is placed on the nut 303, and nut 303 is connected with screw thread on the pillar 301, by adjusting four nuts 303, can adjust the height of lower carrier plate 305.Base 306 is used for fixing pillar 301.
Fig. 7 has more clearly represented the annexation of each parts.As can be seen from this figure, oil cylinder 100 and parallel-plate head piece device 200 are clamped between upper supporting plate 304 and the lower carrier plate 305, the bottom surface of its middle washer 108 and upper supporting plate 304 contacts, and the bottom surface of parallel-plate head piece device 200 contacts with the upper surface of lower carrier plate 305.By tightening four nuts 303, can be clamped in oil cylinder 100 and parallel-plate head piece device 200 reliably on the support 300.
Fig. 8 has represented excitation unit 400, comprises coil 401 and back-shaped permeability magnetic material 402.Excitation unit 400 can produce magnetic field relatively uniformly, acts on the magnetic flow liquid of the parallel-plate chute 205 of flowing through.
Below lower carrier plate 305, be placed with and reclaim oil drum 500, be used to hold the magnetic flow liquid that flows out from parallel-plate chute 205.
By the magnetorheological instrument pilot system of whole hypervelocity being set up based on the mobile mathematical model of the visco-plasticity of Navier-Stokes equation, according to the theoretical prediction result of resistance and the comparison of test findings, can set up magnetic flow liquid have, no excitation situation down cut stress and the relation of shearing rate and the relation of apparent viscosity and shearing rate, pick out the yield stress of magnetic flow liquid, and be based upon the yield stress of magnetic flow liquid under the flow at high speed situation and the mathematical relation of magnetic field intensity.
Claims (3)
1. magnetic current and liquid flow variation characteristic measurement mechanism under the flow at high speed situation, it is characterized in that: by oil cylinder (100), parallel-plate head piece device (200), support (300), excitation unit (400) and recovery oil drum (500) are formed, described parallel-plate head piece device (200) is inserted in the groove of oil cylinder (100) bottom, both are fixed by support (300) jointly, excitation unit (400) is placed on and is used for producing magnetic field relatively uniformly on the lower carrier plate (305) of support (300), and make magnetic field penetration parallel-plate chute (205), reclaim oil drum (500) be placed on parallel-plate chute (205) below, be used for reclaiming the magnetic flow liquid that flows out from parallel-plate chute (205); Parallel-plate head piece device (200) is fixedly formed through bolt (203,204) by back plate (201), header board (202), and on back plate (201), offer rectangle parallel-plate chute (205), after two boards (201,202) is fixing, reprocess out a circular counter bore (206), the oil jacket (109) that goes out of oil cylinder (100) inserts this counterbore (206), avoids magnetorheological overflowing.
2. magnetic current and liquid flow variation characteristic measurement mechanism under the flow at high speed situation according to claim 1, it is characterized in that: oil cylinder (100) comprises piston rod (101), piston (103), upper cylinder body (106), lower cylinder body (107), wherein upper cylinder body (106) and lower cylinder body (107) are by being threaded togather, oiling spiral shell (105) is set on piston (103), oiling spiral shell (105) is opened, between upper cylinder body (106) and lower cylinder body (107), injected magnetic flow liquid in the formed cavity through oil hole; Oil jacket (109) is installed out on lower cylinder body (107), magnetic flow liquid flows into parallel-plate chute (205) through going out oil jacket (109), this pipe shape that goes out oil jacket (109) protrudes in the bottom of lower cylinder body (107), matches with the circular counter bore (206) of parallel-plate head piece device (200).
3. magnetic current and liquid flow variation characteristic measurement mechanism under the flow at high speed situation according to claim 1, it is characterized in that: the diameter of oil cylinder (100) is much larger than the size of parallel-plate chute (205), the diameter that is oil cylinder (100) is 150～200mm, size (1～2) x (10～20) mm of parallel-plate chute (205).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100279983A CN101551316B (en) | 2009-05-15 | 2009-05-15 | Rheological characteristic measuring device of magnetorheological fluid under the condition of high-speed flow |
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| CN2009100279983A CN101551316B (en) | 2009-05-15 | 2009-05-15 | Rheological characteristic measuring device of magnetorheological fluid under the condition of high-speed flow |
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| CN101551316B true CN101551316B (en) | 2011-01-26 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104458203B (en) * | 2014-11-05 | 2017-01-25 | 吉林大学 | Piston type testing device for squeezing flow dynamic characteristics of magnetorheological fluid |
| CN104535489B (en) * | 2015-01-08 | 2017-08-01 | 重庆材料研究院有限公司 | Magnetic control hydrodynamic characteristic test device under high speed shear pattern |
| CN107727947B (en) * | 2017-09-30 | 2019-12-10 | 南京航空航天大学 | Device for detecting DC electric field intensity by using electrorheological fluid |
| CN108679234B (en) * | 2018-07-04 | 2023-11-17 | 清华大学 | Rotary rheometer measuring system suitable for rheological property of magnetic liquid |
| CN109374477A (en) * | 2018-12-14 | 2019-02-22 | 沈阳建筑大学 | A kind of magnetorheological liquid viscosity test macro and measurement method |
| CN109682719B (en) * | 2018-12-21 | 2021-08-17 | 合肥工业大学 | Automatic testing system and method for rheological property of magnetorheological fluid in flow mode |
| CN110346244B (en) * | 2019-07-16 | 2022-03-11 | 重庆大学 | Device and method for measuring response time of magnetorheological fluid |
Citations (4)
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| CN1388366A (en) * | 2001-05-25 | 2003-01-01 | 中国科学技术大学 | Test system for rheological characteristics of magnetic rheological liquid |
| US20030066341A1 (en) * | 2000-05-18 | 2003-04-10 | Rheologics, Inc. | Electrorheological and magnetorheological fluid scanning rheometer |
| CN1746654A (en) * | 2005-09-15 | 2006-03-15 | 上海交通大学 | Magnetic current and liquid flow variation characteristic measuring system |
| CN101324500A (en) * | 2008-07-11 | 2008-12-17 | 重庆大学 | Method and apparatus for detecting magnetic rheology and fluid rheology characteristics |
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2009
- 2009-05-15 CN CN2009100279983A patent/CN101551316B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030066341A1 (en) * | 2000-05-18 | 2003-04-10 | Rheologics, Inc. | Electrorheological and magnetorheological fluid scanning rheometer |
| CN1388366A (en) * | 2001-05-25 | 2003-01-01 | 中国科学技术大学 | Test system for rheological characteristics of magnetic rheological liquid |
| CN1746654A (en) * | 2005-09-15 | 2006-03-15 | 上海交通大学 | Magnetic current and liquid flow variation characteristic measuring system |
| CN101324500A (en) * | 2008-07-11 | 2008-12-17 | 重庆大学 | Method and apparatus for detecting magnetic rheology and fluid rheology characteristics |
Non-Patent Citations (1)
| Title |
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| JP特开平10-104149A 1998.04.24 |
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