CN1388366A - Test system for rheological characteristics of magnetic rheological liquid - Google Patents
Test system for rheological characteristics of magnetic rheological liquid Download PDFInfo
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- CN1388366A CN1388366A CN 01113648 CN01113648A CN1388366A CN 1388366 A CN1388366 A CN 1388366A CN 01113648 CN01113648 CN 01113648 CN 01113648 A CN01113648 A CN 01113648A CN 1388366 A CN1388366 A CN 1388366A
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Abstract
The present invention relates to the test equipment for rheological characteristics of magnetic rheological liquid. The test system includes magnetic conducting loop, magnetic rheological liquid containing cavity, torque moment measuring strain sheet and magnetic field strength measuring Hall sheet. The containing cavity is one sealed container comprising upper and lower discs of magnetic conducting material and in the same diameter and cylinder of non-magnetic conducting material between the discs and there are stepped motor with main shaft connected to the upper disc shaft and elevating mechanism connected to the lower disc shaft. There are two or more exciting coils near the container and the Hall sheet and the strain sheet are set below the lower disc.
Description
The present invention relates to the measuring equipment of magnetic current and liquid flow variation performance.
Magnetic flow liquid (magnetorheological fluid; Be called for short MRF) be a kind of two-phase or multiphase liquid suspension, externally under the action of a magnetic field, rapid variation can take place in its physical form, promptly becomes the class solid from liquid, and macro manifestations becomes the change of the order of magnitude for its rheological characteristics, shear yield strength for example, apparant viscosity etc.This transformation has controllability, reversibility and response (only being a millisecond magnitude) contour technical characterictic rapidly.In recent years, magnetic flow liquid material and application device thereof demonstrate great application prospect and marketable value in modern industry fields such as dynamic transfer system, Aero-Space servo-drive system, active control in structural vibration, robot control system.Development persons design engineering application devices such as the clutch coupling that can be subjected to outfield control, damper brake, vibroshock, sound suppressor, are progressively moving towards market.The actual use shows, the rheological properties of magnetic flow liquid is accurately tested and assessed is the prerequisite of design of MR material and application and development, only understand the rheological properties of various magnetic flow liquid, could select the magnetic flow liquid of different qualities for use according to various different application demands.
Method of testing and corresponding detection system to magnetic current and liquid flow variation characteristic also is in the property the inquired into development stage at present.Existing in the world method of testing is divided into direct measurement and measures two big classes indirectly.Measure indirectly and mainly contain following two kinds: 1) dull and stereotyped shearing-type, this method are to cause the dull and stereotyped shear flow of MRF to test in magnetic field.By the acting force on the measurement drive plate and the movement velocity of drive plate, indirect calculation obtains the relation of MRF yield stress and rate of strain.If the heterogeneity in magnetic field in the taking into account system is not only just tested itself, there is following shortcoming: the computation model that 1. needs to use hydromechanical dull and stereotyped shear flow; 2. need to adopt the MR constitutive model of supposition in theory.As the Bingham constitutive model.2) channel flow model, this method are to form channel flow in magnetic field, by measuring pressure differential deltap P=P1-P0 and MRF flow, thereby can derive the shear yield stress of MRF.Do not consider that technology realizes going up existing problem, only just test itself, also there is following problem: the computation model that 1. depends on channel flow, it need suppose at first that MR keeps even flow characteristics in flowing, the existing research work of this problem points out that ducted electricity, magnetic flow liquid not necessarily flow by even flow model.2. depend on the constitutive model of MR.In a word, indirect measurement is restricted condition in principle.Particularly need the material constitutive relation is made prior supposition, this point often needs therefore to have very big approximation by measuring, is difficult to make accurately measuring.
Directly measuring is to utilize hydromechanical principle, directly measures the spatially distributed functions of magnetic flow liquid shearing rate in magnetic field.Document [R.B for example
Lter, H.Janocha, St.Helbr ü ck DESIGN OF MAGNETORHEOLOGICALFLUID ACTUATORS, 5
ThInternational Conference on New Actuators ' 1996] and document [Ralf.B
Lter and Hartmut Janocha Design Rules for MR Fluid Actuators in DifferentWorking Modes, Passive Damping and Isolation, Smart Structures and Materials1997, PROCEESINGS OF SPIE] in all introduced a kind of magnetic flow liquid that utilizes in the method for bulk containers as test model.Needing to shear bucket in this method has certain thickness, its result to cause the mean radius of barrel interior external series gap to differ bigger, and outside magnetic field intensity differs also bigger in making.Consider from mechanism in addition, such model, the rigidity of shearing bucket is not high, easily produces distortion, and therefore in operational process, the magnetic field homogeneity in the gap is difficult to guarantee more.Magnetic resistance in this system's magnetic circuit is also bigger, thus under low current drives, magnetic field intensity a little less than.
1998, the commercial instrument of measuring the MRF rheological property, i.e. the MRF test macro MR-100-450 of being exclusively used in appearred on the German market.Its structure is to make a magnetic conductive loop and cavity volume by ferrimagnet, is provided with a rotating circular disk in cavity volume.Between disk and cavity volume lower surface, be full of MRF liquid.When the energising back formed electromagnetic circuit, the magnetic line of force vertically passed disk and MRF liquid and the MRF class is solidified.Owing on the turning axle surface, post foil gauge, then can calculate torque by the distortion of measuring this.Can find that by structure analysis the mechanical loading that test plate bears is the exponential function of size in magnetic field, strengthen the radius of rotating circular disk and the ratio (R/h) of MRF thickness, help to improve systemic resolution this instrument.But because its rotating circular disk has placed the MRF liquid reservoir, the size of rotating circular disk must strengthen cavity volume when amplifying simultaneously, can cause the difficulty of making when therefore strengthening its physical dimension.The ratio that this moral product equipment MR-100-450 selects for use is 9, makes its sensitivity on the low side; On the other hand, the torque measurement position of this equipment can only be arranged on the rotation axis, is subjected to the influence of uneven magnetic field force and the influence of supporting moment of friction Mf (H), has limited measuring accuracy; And the size of two magnetic poles of this equipment (being rotating disc and cavity volume lower surface) is inconsistent, is easy to cause the inhomogeneous and leakage field phenomenon in magnetic field, thereby influences measuring accuracy; In addition, critical pieces such as the test plate of this equipment can't be dismantled, also can't the adjusting play, neither be convenient for measuring use, and also be not easy to maintenance.
The objective of the invention is to,, provide a kind of test macro with magnetic current and liquid flow variation performance of two disk rotational shear formula structures at the deficiencies in the prior art.
Magnetic current and liquid flow variation characteristic test macro of the present invention, include the magnetic material magnetic conductive loop that constitutes and the cavity volume and the supporting device thereof that hold magnetic flow liquid, on member, be provided with the Hall plate that is used to measure the foil gauge of moment of torsion and measures magnetic field intensity, it is characterized in that, the described cavity volume that holds magnetic flow liquid constitutes like this: two by permeability magnetic material constitute on, down isometrical disk is fixedly mounted on respectively on two axles that are made of non-magnet material, last disc shaft is connected by the main shaft of web member with a stepper motor, lower disc axle lower end is connected with can be in order to regulate the elevating mechanism of its axis direction position, for example, nut screw body.The axis of diaxon is on same straight line, and last lower disc card is relative, and is provided with the gap between the two, generally between 1-6mm.Periphery at lower disc is fixed with a collar that is made of non-magnet material, and composition can hold the tubbiness airtight container of magnetic flow liquid, is clearance fit between the outer circumference surface of last disk and the inner ring surface of the collar, and disk can be rotated relative to the inner ring surface of the collar; Be provided with field coil nearby at bulk containers, its iron core axis and disc shaft line parallel up and down; Described field coil is two or more, and above lower disc axial line is symmetrically distributed; Describedly be separately positioned on the card below and lower disc axle surface of lower disc in order to the Hall plate of measuring magnetic field intensity and the foil gauge of measuring torque.
Magnetic current and liquid flow variation characteristic test macro of the present invention compared with prior art, has the following advantages:
(1) the torque measurement position of this equipment is arranged on the stationary axle that is made of non-magnet material, can not be subjected to the influence of magnetic field force and the influence of supporting moment of friction, can more conveniently measure its torque exactly, has improved measuring accuracy;
(2) owing to the above lower disc rotational symmetry of field coil distributes, so its Distribution of Magnetic Field is even, makes the eccentric moment minimum, has guaranteed measuring accuracy;
(3) strengthen the radius of rotating circular disk and the ratio (R/h) of MRF thickness, help to improve systemic resolution.The ratio R of the radius of rotating circular disk of the present invention and MRF thickness/h value can easily be brought up to more than 30, compares the MR-100-450 that Germany produces, and its R/h only is 9 situation, and sensitivity improves greatly.
Be further described below by embodiment and accompanying drawing thereof.
Fig. 1 is a kind of example structure synoptic diagram of the present invention.
Among Fig. 1, (1) for having the stepper motor of frequency-variable controller, it by screw retention on the top board (2) of bearing support.(4) be the last rotation axis that is connected with the stepper motor main shaft.(3) for supporting the bearing holder (housing, cover) of going up rotation axis, it is fixed on the upper base plate (6) of bearing support.(5) be last disk, it is fixedly mounted on the lower end of rotation axis, and when stepper motor started, last rotation axis drives went up the disk rotation.(8) be lower disc, it is fixedly mounted on down the upper end of stationary axle (9).Last rotation axis is identical with the axis of following stationary axle, and upper and lower disk diameter is identical, and the 3mm gap is arranged between the two.For avoiding the interference to magnetic field structure, the material of last rotation axis, following stationary axle is copper.(7) for being installed in the collar on the lower disc circumference with interference fit, ring is high to surpass last disk, and formation will go up disk and be included in wherein open containers, and wherein in order to hold magnetic flow liquid, the material of this collar also is a copper.Described bearing support constitutes integral body by top board (2), upper base plate (5), following seat board (10), base plate (11) and many group threaded connectors.Wherein upper base plate, following seat board constitute by non-magnet material, to prevent magnetic dispersion.(19) be hot-wire coil, its mandrel upper end is provided with screw thread, is fixed on the upper base plate by nut.The mandrel of two identical hot-wire coils all with the parallel axes of last rotation axis (or down stationary axle), and with its symmetrical distribution.Two coils are near the side of open containers but do not contact.Also be provided with upper and lower demarcation strip (20), (18) at the two ends up and down of coil, both are magnetic material, to guarantee that the magnetic line of force is unobstructed.Described hot-wire coil is connected on the adjustable direct supply that has current controller, can control magnetic field intensity.(16) for being attached to the lip-deep foil gauge of lower disc axle, in order to measure its torque.(17) for being attached to Hall plate, in order to measure magnetic field intensity at the upper surface of following demarcation strip.The lower end of described down stationary axle (9) is a screw rod, threads engaged on it and axle sleeve (15) inner hole wall, formation nut screw body.There is a conical gear (14) Guan County on the periphery of axle sleeve, is equipped with the outer end of the angular wheel shaft (13) of its engagement and rotates handwheel (12), or directly be connected with stepper motor.When this axle (13) rotated, the engagement of conical gear group drove axle sleeve (15) and rotates, because it is provided with the nut screw body, made down stationary axle (9) can produce upper and lower displacement, thereby reached the purpose of regulating gap length between the upper and lower disk.
Operating process when present embodiment is used for actual test is: the stepper motor input end is connected to the end frequency of signal generator, selects different signal frequencies to regulate the rotating speed of stepper motor, thereby different big or small rotational shear power are provided; Coil input end is connected on the adjustable direct supply of standard the magnetic field intensity of selecting suitable supply voltage and strength of current to come regulating winding to produce; The output terminal that will be used to measure the Hall plate of actual magnetic field intensity is connected to teslameter; The output terminal that will be used to measure the foil gauge of stationary axle distortion size is connected to the strain amplifier that is connected with half bridge circuit.Inject magnetic flow liquid to be measured then in cavity volume, rotate adjusting handle, regulating can the start-up system operation behind the gap (being the thickness of magnetic flow liquid) between the shearing disk.Usually according to the rotating speed of initial value, operation back numerical value and the stepper motor of strain amplifier, read actual magnetic field strength date etc. from teslameter and carry out analysis-by-synthesis, can obtain the relation curve of relation curve, Shear Yield Stress of Magnetorheological Fluids and the magnetic field intensity of Shear Yield Stress of Magnetorheological Fluids and shearing rate, thereby obtain the rheological characteristics parameter of magnetic flow liquid to be measured.
Claims (2)
1. the rheological characteristics test macro of a magnetic flow liquid, include the magnetic material magnetic conductive loop that constitutes and the cavity volume and the supporting device thereof that hold magnetic flow liquid, on member, be provided with the Hall plate that is used to measure the foil gauge of moment of torsion and measures magnetic field intensity, it is characterized in that, the described cavity volume that holds magnetic flow liquid constitutes like this: two by permeability magnetic material constitute on, isometrical disk is fixedly mounted on two respectively by on the non-magnet material axle down, last disc shaft joins by the main shaft of a web member and a stepper motor, the axis of diaxon is on same straight line, last lower disc card is relative, and be provided with the gap between the two, periphery at lower disc is fixed with a collar that is made of non-magnet material, composition can hold the tubbiness airtight container of magnetic flow liquid, and is gapped between the outer circumference surface of last disk and the inner ring surface of the collar; Be provided with field coil nearby at bulk containers, its iron core axis and disc shaft line parallel up and down; Described field coil is two or more, and above lower disc axial line is symmetrically distributed; Describedly be separately positioned on the card below and lower disc axle surface of lower disc in order to the Hall plate of measuring magnetic field intensity and the foil gauge of measuring torque.
2. the rheological characteristics test macro of magnetic flow liquid according to claim 1 is characterized in that being connected with on the described lower disc axle can be in order to regulate the elevating mechanism of its axis direction position.
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| CNB011136480A CN1147722C (en) | 2001-05-25 | 2001-05-25 | Test system for rheological characteristics of magnetic rheological liquid |
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| CNB011136480A CN1147722C (en) | 2001-05-25 | 2001-05-25 | Test system for rheological characteristics of magnetic rheological liquid |
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| CN1147722C CN1147722C (en) | 2004-04-28 |
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| CNB011136480A Expired - Fee Related CN1147722C (en) | 2001-05-25 | 2001-05-25 | Test system for rheological characteristics of magnetic rheological liquid |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003104845A1 (en) * | 2002-06-10 | 2003-12-18 | Valtion Teknillinen Tutkimuskeskus | Method and arrangement for determining sedimentation in a magnetorheological fluid |
| CN100381808C (en) * | 2005-08-18 | 2008-04-16 | 上海交通大学 | Measurement system for rheological property of electrorheological fluids (ERF) |
| CN100385230C (en) * | 2005-09-15 | 2008-04-30 | 上海交通大学 | Magnetic current and liquid flow variation characteristic measuring system |
| CN101551316B (en) * | 2009-05-15 | 2011-01-26 | 南京理工大学 | Rheological characteristic measuring device of magnetorheological fluid under the condition of high-speed flow |
| CN102128770A (en) * | 2010-12-22 | 2011-07-20 | 宁波大学 | Device for testing rheological properties of magnetorheological fluid |
| CN102175576A (en) * | 2011-01-27 | 2011-09-07 | 重庆大学 | Horizontal annular slot type test device for magnetorheological material |
| CN102759498A (en) * | 2012-08-01 | 2012-10-31 | 重庆大学 | Dual-runner magnetorheological fluids (MRFs) characteristic test device and test method thereof |
| CN102879174A (en) * | 2012-08-30 | 2013-01-16 | 江苏大学 | Magneto-rheological fluid yield stress test method and device |
| CN102975183A (en) * | 2012-11-08 | 2013-03-20 | 江苏技术师范学院 | Magnetorheological fluid rotary working platform device |
| CN103161873A (en) * | 2013-04-03 | 2013-06-19 | 山东理工大学 | Analytical calculation method of magneto shearing stress coefficient of shock absorber magneto-rheological liquid |
| CN103512690A (en) * | 2012-06-29 | 2014-01-15 | 东南大学常州研究院 | Testing device for magneto-rheological fluid shear yield stress |
| CN103674783A (en) * | 2013-12-20 | 2014-03-26 | 上海应用技术学院 | Double-coil magneto-rheological fluid performance test device |
| CN103837444A (en) * | 2014-03-07 | 2014-06-04 | 黑龙江工程学院 | Alternate reverse-magnetic-field variable magnetorheological fluid performance testing device and testing method |
| CN103901168A (en) * | 2014-04-08 | 2014-07-02 | 中国矿业大学 | Magnetorheological fluid behavior tester |
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| CN108196209A (en) * | 2017-12-18 | 2018-06-22 | 中国矿业大学 | A kind of magnetorheological fluid characteristic tester |
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2001
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Cited By (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003104845A1 (en) * | 2002-06-10 | 2003-12-18 | Valtion Teknillinen Tutkimuskeskus | Method and arrangement for determining sedimentation in a magnetorheological fluid |
| CN100381808C (en) * | 2005-08-18 | 2008-04-16 | 上海交通大学 | Measurement system for rheological property of electrorheological fluids (ERF) |
| CN100385230C (en) * | 2005-09-15 | 2008-04-30 | 上海交通大学 | Magnetic current and liquid flow variation characteristic measuring system |
| CN101551316B (en) * | 2009-05-15 | 2011-01-26 | 南京理工大学 | Rheological characteristic measuring device of magnetorheological fluid under the condition of high-speed flow |
| CN102128770B (en) * | 2010-12-22 | 2013-07-31 | 宁波大学 | Device for testing rheological properties of magnetorheological fluid |
| CN102128770A (en) * | 2010-12-22 | 2011-07-20 | 宁波大学 | Device for testing rheological properties of magnetorheological fluid |
| CN102175576A (en) * | 2011-01-27 | 2011-09-07 | 重庆大学 | Horizontal annular slot type test device for magnetorheological material |
| CN102175576B (en) * | 2011-01-27 | 2012-08-01 | 重庆大学 | Horizontal annular slot type test device for magnetorheological material |
| CN103512690A (en) * | 2012-06-29 | 2014-01-15 | 东南大学常州研究院 | Testing device for magneto-rheological fluid shear yield stress |
| CN103512690B (en) * | 2012-06-29 | 2015-08-19 | 东南大学常州研究院 | Shear Yield Stress of Magnetorheological Fluids proving installation |
| CN102759498B (en) * | 2012-08-01 | 2014-03-12 | 重庆大学 | Dual-runner magnetorheological fluids (MRFs) characteristic test device and test method thereof |
| CN102759498A (en) * | 2012-08-01 | 2012-10-31 | 重庆大学 | Dual-runner magnetorheological fluids (MRFs) characteristic test device and test method thereof |
| CN102879174A (en) * | 2012-08-30 | 2013-01-16 | 江苏大学 | Magneto-rheological fluid yield stress test method and device |
| CN102879174B (en) * | 2012-08-30 | 2015-08-26 | 江苏大学 | Magnetic flow liquid yield stress method of testing and device thereof |
| CN102975183A (en) * | 2012-11-08 | 2013-03-20 | 江苏技术师范学院 | Magnetorheological fluid rotary working platform device |
| CN103161873A (en) * | 2013-04-03 | 2013-06-19 | 山东理工大学 | Analytical calculation method of magneto shearing stress coefficient of shock absorber magneto-rheological liquid |
| CN103161873B (en) * | 2013-04-03 | 2014-11-05 | 山东理工大学 | Analytical calculation method of magneto shearing stress coefficient of shock absorber magneto-rheological liquid |
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| CN106404889A (en) * | 2016-09-08 | 2017-02-15 | 上海应用技术大学 | Gap adjustable type mechanical property testing device of magneto-rheological liquid |
| CN106404889B (en) * | 2016-09-08 | 2019-08-02 | 上海应用技术大学 | Clearance adjustable type magnetorheological fluid Mechanics Performance Testing device |
| CN106772144A (en) * | 2016-11-29 | 2017-05-31 | 上海工程技术大学 | A kind of magnetic flow liquid magnetic field loading test device |
| CN107907447A (en) * | 2017-10-30 | 2018-04-13 | 常州大学 | The parallel plate fixtures of rotational rheometer |
| CN108196209A (en) * | 2017-12-18 | 2018-06-22 | 中国矿业大学 | A kind of magnetorheological fluid characteristic tester |
| CN110346244A (en) * | 2019-07-16 | 2019-10-18 | 重庆大学 | Measure the device and method of magnetorheological fluid response time |
| CN113740414A (en) * | 2021-07-22 | 2021-12-03 | 抚顺煤矿电机制造有限责任公司 | Device for detecting rotor magnetic steel of permanent magnet motor by adopting magnetorheological fluid |
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