CN1731140A - Measurement system for rheological property of electrorheological fluids (ERF) - Google Patents
Measurement system for rheological property of electrorheological fluids (ERF) Download PDFInfo
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- CN1731140A CN1731140A CN 200510028884 CN200510028884A CN1731140A CN 1731140 A CN1731140 A CN 1731140A CN 200510028884 CN200510028884 CN 200510028884 CN 200510028884 A CN200510028884 A CN 200510028884A CN 1731140 A CN1731140 A CN 1731140A
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Abstract
The invention relates to a measuring system in the field of measuring technology, which comprises: a rotating shaft, an upper part four fluorine insulating sleeve, a beam arm, a measuring space, a conductive ring, a lower part four fluorine insulating sleeve and a base seat. Wherein the rotating shaft, the upper part four fluorine insulating sleeve and the beam arm tightly matching forms the moving unit of the measuring system to displace the upper plate of the ammeter; the base seat adds the conductive ring and the lower part four fluorine insulating sleeve; the inner cylinder of the conductive ring, the lower part four fluorine insulating sleeve and the cylinder of the center of the base seat forms the measuring space; the electrorheological liquid is positioned inside the measuring space; the conductive ring is connected with the positive source; the base seat is connected with the negative source; the field density of the measuring space is radial radiation direction; the beam arm pokes into the measuring space to cut the electrorheological liquid along to the tangential direction.
Description
Technical field
What the present invention relates to is a kind of device of field of measuring technique, specifically is a kind of electrorheological liquid flow variation characteristic measuring system.
Background technology
Electrorheological fluid is a kind of SMART FLUID material, and rheological characteristics is the characteristic of its fundamental sum most critical, and instrument and the method for measuring the electrorheological fluid rheological characteristics are also varied.Existing electrorheological fluid rheological characteristics surveying instrument and method are to reequip on the flow graph that the common fluid rheological characteristics measures and upgrade in existing being used for basically.Common way is exactly to increase high voltage conduction and insulation component on measuring system, forms high electric field at the measurement space of measuring system.Two plane-table operation system with rotary flow graph is an example, and the measure of existing report is with upper flat plate in the measuring system or other parts insulation dull and stereotyped down and instrument, then high voltage is added to insulated upper flat plate or down on the flat board.Up to the present, the required electric field intensity of electrorheological fluid generation significant rheology effect is generally all more than 2000V/mm.If the spacing of upper and lower flat board is 0.5mm in the measuring system, the voltage between two flat boards need reach more than the 1000V so.
Through the new discovery of looking into to prior art, CVO100 flow graph that Britain BOHLIN company (2003 by MALVERN corporate buyout) produces and corresponding high voltage measuring system promptly belong to the above-mentioned type.Wherein, the insulation of upper flat plate and apparatus subject, but the aluminium matter conducting ring above it is immersed in the electrolyte solution groove on the mounting base.The inwall of electrolyte solution groove is a metal, and shell is the phenolics insulating material, makes the insulation of electrolyte solution and apparatus subject.The core pin of high voltage direct current by the BNC connector that is connected with electrolyte solution groove metal inner surface is added to the electrolyte solution in metal inner surface and the groove, so the upper flat plate band high pressure positive electricity of measuring system.The shell of BNC connector and following dull and stereotyped ground connection.During with this instrument actual measurement electrorheological fluid, the rotational speed of upper flat plate can't be stablized, and the shear stress rapid fluctuation can't obtain effective measurement data.By analysis, this is that the characteristics of flow graph itself and the singularity of electrorheological fluid rheological characteristics cause.At first, CVO100 is a high precision flow graph of measuring design for the rheological characteristics of common fluids such as oil, and shear stress resolution and shear rate resolution are very high, but maximum drive moment has only 0.1Nm.Secondly, the electrorheological fluid under the high electric field intensity under the shear action of upper flat plate, before the surrender it to the reacting force of upper flat plate often times over the reacting force of surrender back to upper flat plate.In the experiment, often observing upper flat plate can not be in micro breadth oscillation by the setting value rotation of shear rate, promptly is because the driving moment of flow graph causes inadequately.The 3rd, the version of two plane-table operation system can not guarantee electrorheological fluid and upper flat plate fully with stably contact.The 4th, in the power supply mode of positive electrode, additional shear stress has been introduced in the contact between aluminium matter conducting ring and the electrolyte solution, thereby influences measuring accuracy.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of electrorheological liquid flow variation characteristic measuring system is provided, after rotary flow graph is used this measuring system, can be accurately and measure the rheological characteristics of electrorheological fluid reliably.
The present invention is achieved by the following technical solutions, comprising: rotating shaft, top tetrafluoro insulation sleeve, shear arm, measurement space, conducting ring, bottom tetrafluoro insulation sleeve and pedestal.The closely cooperate dynamic component that constitutes measuring system of rotating shaft, top tetrafluoro insulation sleeve and shear arm replaces original upper flat plate in the flow graph, and dynamic component discord high voltage power supply links to each other; Pedestal has kept the outline mechanical dimension of the original pedestal of flow graph, but conducting ring and bottom tetrafluoro insulation sleeve have been set up in the centre, and the face of cylinder of the inner cylinder face of conducting ring, bottom tetrafluoro insulation sleeve and pedestal center constitutes measurement space, electrorheological fluid is arranged in the measurement space, conducting ring connects high-voltage power cathode, pedestal connects the high-voltage power supply negative pole, electric field intensity in the measurement space is the radial radiation direction, and shear arm stretches into the electrorheological fluid of tangentially shearing in the measurement space wherein.
Wherein, top tetrafluoro insulation sleeve and rotating shaft closely cooperate, and step-like projection is radially outwards arranged at the rotating shaft bottom, and the correspondence position of top tetrafluoro insulation sleeve has step-like indent, and the axial location of the two is able to accurate location.The last root of shear arm is an annular, and it and top tetrafluoro insulation sleeve closely cooperate; Step-like projection is radially outwards arranged at tetrafluoro insulation sleeve bottom, top, and the correspondence position of the annular root of shear arm has step-like indent, and the axial location of the two is able to accurate location.Shear arm is two narrow thin slices that extend vertically below annular root, and the arc length of each thin slice is 2mm, length 11mm, and thickness 0.5mm, two thin slices are that the circumference of 10.75mm is symmetrically distributed with the center of circle along radius.Rotating shaft, top tetrafluoro insulation sleeve and shear arm closely cooperate and constitute the dynamic component of measuring system, and it rotates under the driving of motor.The top of pedestal is a ring groove, and the center that ring groove surrounded is that radius is the cylinder of 10mm.The external cylindrical surface of bottom tetrafluoro insulation sleeve and the face of cylinder, the outside of ring groove closely cooperate, and the bottom surface of bottom tetrafluoro insulation sleeve and the bottom of ring groove contact, and bottom center's circular hole of bottom tetrafluoro insulation sleeve contacts with the inboard face of cylinder of ring groove.The inner cylinder face of the external cylindrical surface of conducting ring and bottom tetrafluoro insulation sleeve is movable to be cooperated, and the inner cylinder face of conducting ring and radius in the middle of the pedestal are that the formation width is the annular measurement space of 1.5mm between the face of cylinder of 10mm.The degree of depth of measurement space is 11mm, is that the cylinder upper surface of 10mm is when contacting when the bottom surface of rotating shaft with the pedestal middle radius, the length that shear arm stretches into measurement space is 10mm, radius in the middle of the inside surface of shear arm and the pedestal is that the distance between the face of cylinder of 10mm is 0.5mm, and the distance between the outside surface of shear arm and the inner cylinder face of conducting ring is 0.5mm.
When the present invention worked, the high-pressure side of high-voltage power supply was connected to conducting ring, and the ground wire of high-voltage power supply is connected to pedestal.When the output voltage of high-voltage power supply was 2000V, the radial electric field intensity of shear arm position was 2000V/mm, and the radial electric field intensity of other position is 1333V/mm.Electrorheological fluid is injected measurement space, is that the cylinder upper surface of 10mm contact with the descend bottom surface make it and pedestal middle radius of rotating shaft, and the upper and lower distance of setting this moment is zero.With the rotating shaft 2mm that rises, so the length of shear arm in measurement space is 8mm.In rotating shaft when rotation,, shear arm is sheared the electrorheological fluid in the measurement space, and the shearing moment that shear arm is subjected to is detected by the torque sensor in the flow graph through rotating shaft, the shear stress values that can calculate electrorheological fluid by the arm of force length and the shear area of shear arm.The rheological characteristics of electrorheological fluid can be described with shear rate under the different electric field intensity and the relation between the shear stress.
Because therefore the thickness of shear arm, can think that the arm of force length of inside and outside shear surface of shear arm all is R much smaller than the radius R of shear arm.If it is H that shear arm immerses the length of measurement space, the arc length of shear arm is L, and shearing moment is M, shear stress
If the shear line speed of shear arm is V, the radius in the middle of the inside and outside surface of shear arm and the pedestal is that the distance between the inner cylinder face of the face of cylinder of 10mm and conducting ring is D, shear rate
Can obtain the concrete parameter of various electrorheological fluid rheological characteristics models by the measurement data of shear stress under the different electric field intensity and shear rate.
Compared with prior art, the homogeneity of shear rate of the present invention is better than two plane-table operation systems, because radially be uneven at two plane-table operation system medium shear rate.Because the bottom of shear arm is to be immersed in the electrorheological fluid, the two can contact reliably.Though the shear stress of electrorheological fluid is much larger than common fluid, but the shear area of measuring system of the present invention is very little, can also further be limited by upper and lower the moving of rotating shaft simultaneously, make the maximum drive moment of the suffered maximum shear torque of rotating shaft, to guarantee the normal surveying work of flow graph less than flow graph.Rotating shaft does not have other acting force except being subjected to shearing moment, eliminated in the original pair of plane-table operation system the additional shearing moment that brings that contacts for the aluminium matter conducting ring of High Voltage Power Supply and electrolyte solution.By conducting ring, high voltage direct current can be added on the current liquid of measurement space easily.Current liquid only need fill up the measurement space of measuring system, and the consumption of electrorheological fluid is few.After measurement is finished, can clean measurement space by the dismounting conducting ring.The present invention has made full use of the function of existing flow graph, has embodied the mechanism characteristics of electrorheological fluid on principle and structure, and High Voltage Power Supply does not influence measuring accuracy, and the electrorheological fluid consumption is few, and cleaning is convenient, helps the investigation of materials of electrorheological fluid.
Description of drawings
Fig. 1 one-piece construction synoptic diagram of the present invention
Embodiment
As shown in Figure 1, the present invention includes: rotating shaft 1, top tetrafluoro insulation sleeve 2, shear arm 3, measurement space 4, conducting ring 5, bottom tetrafluoro insulation sleeve 6 and pedestal 7.The closely cooperate dynamic component that constitutes measuring system of rotating shaft 1, top tetrafluoro insulation sleeve 2 and shear arm 3 replaces original upper flat plate in the flow graph, and dynamic component discord high voltage power supply links to each other; Conducting ring 5 and bottom tetrafluoro insulation sleeve 6 have been set up in the middle of the pedestal 7, and the face of cylinder of the inner cylinder face of conducting ring 5, bottom tetrafluoro insulation sleeve 6 and pedestal 7 centers constitutes measurement space 4, electrorheological fluid is arranged in the measurement space 4, conducting ring 5 connects high-voltage power cathode, pedestal 7 connects the high-voltage power supply negative pole, electric field intensity in the measurement space 4 is the radial radiation direction, and shear arm 3 stretches into the electrorheological fluid of tangentially shearing in the measurement space 4 wherein.
Rotating shaft 1, top tetrafluoro insulation sleeve 2 and shear arm 3 closely cooperate and constitute the dynamic component of measuring system, and it rotates under the driving of motor.The top of pedestal 7 is ring grooves, and the center that ring groove surrounded is that radius is the cylinder of 10mm.The external cylindrical surface of bottom tetrafluoro insulation sleeve 6 and the face of cylinder, the outside of ring groove closely cooperate, and the bottom surface of bottom tetrafluoro insulation sleeve 6 and the bottom of ring groove contact, and bottom center's circular hole of bottom tetrafluoro insulation sleeve 6 contacts with the inboard face of cylinder of ring groove.The inner cylinder face of the external cylindrical surface of conducting ring 5 and bottom tetrafluoro insulation sleeve 6 is movable to be cooperated, and the inner cylinder face of conducting ring 5 and radius in the middle of the pedestal 7 are that the formation width is the annular measurement space 4 of 1.5mm between the face of cylinder of 10mm.The degree of depth of measurement space 4 is 11mm, when the radiuses in the middle of the bottom surface of rotating shaft 1 and the pedestal 7 are that the cylinder upper surface of 10mm is when contacting, the length that shear arm 3 stretches into measurement space 4 is 10mm, radius in the middle of the inside surface of shear arm 3 and the pedestal 7 is that the distance between the face of cylinder of 10mm is 0.5mm, and the distance between the inner cylinder face of the outside surface of shear arm 3 and conducting ring 5 is 0.5mm.
Top tetrafluoro insulation sleeve 2 and rotating shaft 1 closely cooperate, and step-like projection is radially outwards arranged at rotating shaft 1 bottom, and the correspondence position of top tetrafluoro insulation sleeve 2 has step-like indent, and the axial location of the two is able to accurate location.The last root of shear arm 3 is an annular, it and top tetrafluoro insulation sleeve 2 closely cooperate, and step-like projection is radially outwards arranged at tetrafluoro insulation sleeve 2 bottoms, top, and the correspondence position of the annular root of shear arm 3 has step-like indent, and the axial location of the two is able to accurate location.Shear arm 3 is two narrow thin slices that extend vertically below annular root, and the arc length of each thin slice is 2mm, length 11mm, and thickness 0.5mm, two thin slices are that the circumference of 10.75mm is symmetrically distributed with the center of circle along radius.Shear arm 3 discord high voltage power supplies directly are connected.
During measurement, the high-pressure side of high-voltage power supply is connected to conducting ring 5, and the ground wire of high-voltage power supply is connected to pedestal 7.Electrorheological fluid is injected measurement space 4, is that the cylinder upper surface of 10mm contact with the descend bottom surface that makes it and pedestal 7 middle radius of rotating shaft 1, and the upper and lower distance of setting this moment is zero.With rotating shaft 1 rising 2mm, so the length of shear arm 3 in measurement space 4 is 8mm.During rotating shaft 1 rotation, the electrorheological fluid that shear arm 3 is sheared in the measurement space 4, the shearing moment that shear arm 3 is subjected to is detected by the torque sensor in the flow graph through rotating shaft 1, the shear stress values that can calculate electrorheological fluid by the arm of force length and the shear area of shear arm 3.
Claims (10)
1, a kind of electrorheological liquid flow variation characteristic measuring system that is applied to rotary flow graph, comprise: rotating shaft (1), top tetrafluoro insulation sleeve (2), shear arm (3), pedestal (7), it is characterized in that, also comprise: measurement space (4), conducting ring (5) and bottom tetrafluoro insulation sleeve (6), wherein, rotating shaft (1), the closely cooperate dynamic component that constitutes measuring system of top tetrafluoro insulation sleeve (2) and shear arm (3) replaces upper flat plate in the flow graph, conducting ring (5) and bottom tetrafluoro insulation sleeve (6) have been set up in the middle of the pedestal (7), and the inner cylinder face of conducting ring (5), the face of cylinder of bottom tetrafluoro insulation sleeve (6) and pedestal (7) center constitutes measurement space (4), electrorheological fluid is arranged in the measurement space (4), conducting ring (5) connects high-voltage power cathode, pedestal (7) connects the high-voltage power supply negative pole, electric field intensity in the measurement space (4) is the radial radiation direction, and shear arm (3) stretches into the electrorheological fluid of tangentially shearing in the measurement space (4) wherein.
2, electrorheological liquid flow variation characteristic measuring system according to claim 1, it is characterized in that, tetrafluoro insulation sleeve (2) and rotating shaft (1) closely cooperate, and step-like projection is radially outwards arranged at rotating shaft (1) bottom, and the correspondence position of top tetrafluoro insulation sleeve (2) has step-like indent, and the axial location of the two is located.
3, electrorheological liquid flow variation characteristic measuring system according to claim 2, it is characterized in that, the last root of shear arm (3) is an annular, it and top tetrafluoro insulation sleeve (2) closely cooperate, and step-like projection is radially outwards arranged at top tetrafluoro insulation sleeve (2) bottom, and the correspondence position of the annular root of shear arm (3) has step-like indent, and the axial location of the two is located.
4, electrorheological liquid flow variation characteristic measuring system according to claim 3 is characterized in that, shear arm (3) is two narrow thin slices that extend vertically below annular root, and two thin slices are symmetrically distributed with the center of circle along circumference.
5, electrorheological liquid flow variation characteristic measuring system according to claim 4 is characterized in that, the arc length of each thin slice is 2mm, length 11mm, and thickness 0.5mm, two thin slices are that the circumference of 10.75mm is symmetrically distributed with the center of circle along radius.
6, electrorheological liquid flow variation characteristic measuring system according to claim 1 is characterized in that, the top of pedestal (7) is a ring groove, and the center that ring groove surrounded is that radius is the cylinder of 10mm.
7, according to claim 1 or 6 described electrorheological liquid flow variation characteristic measuring systems, it is characterized in that, the face of cylinder, the outside of the external cylindrical surface of bottom tetrafluoro insulation sleeve (6) and pedestal (7) ring groove closely cooperates, the bottom surface of bottom tetrafluoro insulation sleeve (6) contacts with the bottom of pedestal (7) ring groove, and bottom center's circular hole of bottom tetrafluoro insulation sleeve (6) contacts with the inboard face of cylinder of ring groove.
8, electrorheological liquid flow variation characteristic measuring system according to claim 1 is characterized in that, the inner cylinder face of the external cylindrical surface of conducting ring (5) and bottom tetrafluoro insulation sleeve (6) is movable to be cooperated.
9, electrorheological liquid flow variation characteristic measuring system according to claim 1, it is characterized in that, measurement space (4) is for the radius in the middle of the inner cylinder face of conducting ring (5) and the pedestal (7) is that the width that constitutes between the face of cylinder of 10mm is the annular measurement space of 1.5mm.
10, according to claim 1 or 9 described electrorheological liquid flow variation characteristic measuring systems, it is characterized in that, the degree of depth of measurement space (4) is 11mm, when the radius in the middle of the bottom surface of rotating shaft (1) and the pedestal (7) is that the cylinder upper surface of 10mm is when contacting, the length that shear arm (3) stretches into measurement space (4) is 10mm, radius in the middle of the inside surface of shear arm (3) and the pedestal (7) is that the distance between the face of cylinder of 10mm is 0.5mm, and the distance between the inner cylinder face of the outside surface of shear arm (3) and conducting ring (5) is 0.5mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100288842A CN100381808C (en) | 2005-08-18 | 2005-08-18 | Measurement system for rheological property of electrorheological fluids (ERF) |
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| CNB2005100288842A CN100381808C (en) | 2005-08-18 | 2005-08-18 | Measurement system for rheological property of electrorheological fluids (ERF) |
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| CN1731140A true CN1731140A (en) | 2006-02-08 |
| CN100381808C CN100381808C (en) | 2008-04-16 |
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Cited By (8)
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| CN102519842A (en) * | 2011-11-30 | 2012-06-27 | 长城汽车股份有限公司 | Method and device for quickly testing low temperature torque and similar viscosity of oil |
| CN101526459B (en) * | 2009-04-16 | 2012-11-14 | 中国船舶重工集团公司第七二五研究所 | Flectrorheological material damping performance test device and method thereof |
| CN103115851A (en) * | 2013-01-25 | 2013-05-22 | 中国兵器工业第五二研究所 | Giant current variant shearing strength testing device and testing method thereof |
| CN105044158A (en) * | 2015-08-18 | 2015-11-11 | 西北工业大学 | Electro-rheological characteristic test device and electro-rheological characteristic test method of flammable and combustible liquid |
| CN109752235A (en) * | 2019-03-27 | 2019-05-14 | 上海大学 | A kind of giant electro-rheological liquid extruding force test device |
| CN111257168A (en) * | 2020-02-27 | 2020-06-09 | 清华大学 | Electrorheological property testing device and method |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87207349U (en) * | 1987-07-31 | 1988-03-09 | 上海建筑材料工业学院 | Rheometer for determining two-parameter with rotary inner vane in outer drum |
| US5177997A (en) * | 1991-09-16 | 1993-01-12 | The United States Of America As Represented By The Secretary Of The Navy | Dynamic test apparatus for electro-rheological fluids |
| DE19826574A1 (en) * | 1998-06-15 | 2000-02-17 | Vogel Ruprecht | Method to determine rheological properties of freshly mixed plaster or similar mortar type substance; involves following standard preparation procedure and using shearing probe |
| CN1109238C (en) * | 2000-07-06 | 2003-05-21 | 中国科学院力学研究所 | Fluid rheological characteristics measuring method adopting annular flowing device |
| CN1147722C (en) * | 2001-05-25 | 2004-04-28 | 中国科学技术大学 | Test system for rheological characteristics of magnetic rheological liquid |
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2005
- 2005-08-18 CN CNB2005100288842A patent/CN100381808C/en not_active Expired - Fee Related
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| CN102519842A (en) * | 2011-11-30 | 2012-06-27 | 长城汽车股份有限公司 | Method and device for quickly testing low temperature torque and similar viscosity of oil |
| CN102519842B (en) * | 2011-11-30 | 2013-12-11 | 长城汽车股份有限公司 | Method for quickly testing low temperature torque and similar viscosity of oil |
| CN103115851A (en) * | 2013-01-25 | 2013-05-22 | 中国兵器工业第五二研究所 | Giant current variant shearing strength testing device and testing method thereof |
| CN105044158A (en) * | 2015-08-18 | 2015-11-11 | 西北工业大学 | Electro-rheological characteristic test device and electro-rheological characteristic test method of flammable and combustible liquid |
| CN105044158B (en) * | 2015-08-18 | 2017-11-03 | 西北工业大学 | A kind of flammable and combustible liquids electrorheological property test device and method of testing |
| CN109752235A (en) * | 2019-03-27 | 2019-05-14 | 上海大学 | A kind of giant electro-rheological liquid extruding force test device |
| CN111257168A (en) * | 2020-02-27 | 2020-06-09 | 清华大学 | Electrorheological property testing device and method |
| CN112268502A (en) * | 2020-10-15 | 2021-01-26 | 李玲 | Indoor distance measuring device utilizing electrorheological fluid to measure |
| CN112268502B (en) * | 2020-10-15 | 2022-05-27 | 深圳洲际设计有限公司 | Indoor distance measuring device utilizing electrorheological fluid to measure |
| CN112284224A (en) * | 2020-11-10 | 2021-01-29 | 殷晓倩 | New forms of energy electric automobile motor and rear axle concentricity detection device |
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