CN105547923A - A double-tension-source type yield stress measuring system for a magnetorheological fluid - Google Patents
A double-tension-source type yield stress measuring system for a magnetorheological fluid Download PDFInfo
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- CN105547923A CN105547923A CN201510967974.1A CN201510967974A CN105547923A CN 105547923 A CN105547923 A CN 105547923A CN 201510967974 A CN201510967974 A CN 201510967974A CN 105547923 A CN105547923 A CN 105547923A
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- 239000012530 fluid Substances 0.000 title abstract description 10
- 239000007788 liquid Substances 0.000 claims description 67
- 102000011842 Serrate-Jagged Proteins Human genes 0.000 claims description 10
- 108010036039 Serrate-Jagged Proteins Proteins 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000003028 elevating effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 101150006573 PAN1 gene Proteins 0.000 description 1
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- 238000011156 evaluation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
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- 230000002441 reversible effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/0026—Investigating specific flow properties of non-Newtonian fluids
- G01N2011/0033—Yield stress; Residual stress at zero shear rate
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Abstract
The invention relates to a double-tension-source type yield stress measuring system for a magnetorheological fluid. The system comprises a lifting device, a magnetic field generating device and a lifting block. The magnetic field generating device comprises a radial multi-stage magnetic ring and a magnetorheological fluid tank. The magnetorheological fluid tank is cylindrical and is disposed in the radial multi-stage magnetic ring. The magnetorheological fluid tank and the radial multi-stage magnetic ring are coaxially arranged. The magnetic field generating device is arranged horizontally. The bottom of the magnetic field generating device is provided with the lifting device. The lifting block is in a cylinder shape. The outer diameter of the lifting block is smaller than the inner diameter of the magnetorheological fluid tank. The lifting block and the magnetorheological fluid tank are coaxially arranged. The lifting block is pulled by a pulling rope to move along the straight line where the axis of the magnetorheological fluid tank is. The pulling rope is provided with a tension sensor. Compared with the prior art, the system is advantaged by accurate measurement results, visual data presentation, and the like.
Description
Technical field
The present invention relates to a kind of magnetorheological fluid performance research field, especially relate to a kind of two pulling force sources formula magnetic flow liquid yield stress measurement mechanism.
Background technology
Magnetic flow liquid (MRF) is that material jumpy occurs one rheological characteristics under additional magnetic fields, and it is when without externally-applied magnetic field, shows as the Newtonian fluid that flowing is good; But under adding strong magnetic field action outside, its apparent viscosity can increase several order of magnitude in millisecond, and presents the mechanical property of similar solid, and viscosity B coefficent is continuous reversible, namely once after removing magnetic field, becomes again the liquid that can flow.Utilize the characteristic of magnetic flow liquid, can by regulating magnetic field intensity thus reaching the object changing system dynamics.
The magnetic flow liquid of research is of a great variety both at home and abroad at present, but magnetorheological POLARIZATION MECHANISM does not obtain unified understanding so far yet, application scenario and the condition of various magnetic flow liquid can not be widely used in the structure of magnetic flow liquid and the description of mechanical property, the mathematical model of magnetic flow liquid and control technology also imperfection, therefore may there is design objective and experiment value difference in the application greatly, even greatly depart from the situation of estimated performance.And the yield stress of magnetic flow liquid is one of Specifeca tion speeification of magnetic flow liquid, accurately test magnetic flow liquid yield stress is carrying out there is important meaning in the theoretical research of magnetic flow liquid, performance evaluation, engineer applied and design magnetic flow liquid components and parts.The current ways and means occurring a variety of test magnetic flow liquid yield stress, conventional has parallel disk method, Tube flow method and dull and stereotyped czochralski method etc.These method of testings all based on different theoretical models and method of testing, thus result in that to adopt different method of testings to measure the data that same magnetic flow liquid sample obtains not identical yet.
Summary of the invention
Object of the present invention be exactly provide to overcome defect that above-mentioned prior art exists a kind of measurement result accurately, data present two pulling force sources formula magnetic flow liquid yield stress measuring system intuitively.
Object of the present invention can be achieved through the following technical solutions:
A kind of two pulling force sources formula magnetic flow liquid yield stress measuring system, comprise jacking gear, field generator for magnetic and lift block, described field generator for magnetic is made up of radial multi-stage magnet ring and magnetorheological liquid bath, described magnetorheological liquid bath cylindrically, be positioned at radial multi-stage magnet ring, coaxially arrange with radial multi-stage magnet ring; Described field generator for magnetic horizontal positioned, bottom is provided with jacking gear, and lift block is cylindric, external diameter is less than the internal diameter of magnetorheological liquid bath, coaxially arranges with magnetorheological liquid bath, by the axle place rectilinear motion of stay cord traction along magnetorheological liquid bath, stay cord is provided with pulling force sensor.
Described radial multi-stage magnet ring is made up of multiple coaxial radial multi-stage magnet ring unit arranged of a plane that is positioned at, and described radial multi-stage magnet ring unit is circular, is surrounded by multiple arcuation permanent magnet; Described arcuation permanent magnet is placed in permanent magnet grid groove, and permanent magnet grid groove is fixed on flat board.The present invention can change the size of magnetic field intensity by the number increasing or reduce radial multi-stage magnet ring unit.
Described jacking gear is hydraulic package, and described hydraulic package comprises piston rod and cylinder barrel, and hydraulic package is vertically placed, and top is fixed with dull and stereotyped lower surface, and bottom is fixed on base.
Preferably, the external diameter of described lift block is 1/2 ~ 9/10 of magnetorheological liquid bath internal diameter.
The side of described lift block is provided with around its side rectangular channel of a week or serrate slot.For eliminating " wall effect ", must ensure that magnetic flow liquid " pinning " is in coupling material (lift block), can not produce slip.Therefore at the many grooves of surface working of coupling material (lift block).
Described rectangular channel or serrate slot are provided with multiple, and the axis direction along lift block is arranged.
Preferably, described rectangular channel or the degree of depth of serrate slot are 1/50 ~ 1/5 of lift block bottom surface radius, and width is 1/100 ~ 1/5 of lift block profile height.
Described stay cord one end is connected with the top of lift block, and the other end is walked around fixed pulley and hung weight.
Described weight comprises the counterweight in scale pan and scale pan.
This system also comprises for the rope clamp of fixed pulling rope and the apparatus for controlling of lifting for controlling elevating mechanism.
Improve the degree of accuracy of measurement result, one is the loading of power and measure must accurately, and be secondly that magnetic field is wanted evenly, the 3rd is will be reduced to minimum by the various resistances in power transmittance process.If the accurate loading of power and Measurement accuracy adopt the mode loaded continuously, measure and adopt sensor measurement generally can ensure accuracy requirement, the uneven of magnetic field affects very large on measurement, because the yield point that we measure is the surrender under certain intensity, so need to ensure the even of magnetic field in magnetic Circuit Design.
When measuring magnetic flow liquid yield stress, the presentation mode of pulling force has the following two kinds:
(1) fix jacking gear, make it not move up and down; To lift block to insert in magnetic flow liquid, pulling force sensor registration is 0, the scale pan stay cord walking around fixed pulley and pulling force sensor, lift block and is connected, by adding counterweight to lifting block applying pulling force upwards; Measure pulling force used with pulling force sensor, the yield stress of magnetic flow liquid can be conversed.
(2) lift block is inserted the stay cord fixed after in magnetic flow liquid on fixed pulley, it is made not to be moved, pulling force sensor registration is 0, start jacking gear, its uniform speed slow is declined, produce relative tension to lift block, pulling force sensor measures pulling force size, can converse the yield stress of magnetic flow liquid.
(3) to be converted into the concrete formula of magnetic flow liquid yield stress as follows for pulling force:
By known formula:
Can obtain:
Wherein: Δ F-pulling force and the difference lifting block gravity;
C-constant, is determined, generally between 2 ~ 3 by concrete lift situation;
The profile height of L-lift block;
The degree of depth of h-magnetorheological liquid bath.
Compared with prior art, the present invention has following beneficial effect:
(1) measuring process is easy to observe, and operating process is convenient, measures gained yield value of stress accurate;
(2) this measurement mechanism adopts two pulling force source, and namely the producing method of pulling force has two kinds, and one is utilize counterweight to come to produce pulling force to lift block by stay cord; Another is the upper end of fixing lift block, utilizes jacking gear that field generator for magnetic is declined, and then produces pulling force to lift block.And the pulling force that these two kinds of modes produce is all more stable, avoids motor to provide the fluctuation of pulling force;
(3) by this system, quantitative test is carried out to the surrender shear stress of experiment magnetic flow liquid, be conducive to magnetic flow liquid and give full play to its performance characteristic in the application.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of permanent magnet grid groove of the present invention;
Fig. 3 is the Distribution of Magnetic Field schematic diagram of radial multi-stage magnet ring of the present invention;
Fig. 4 is lifting device structure figure of the present invention;
Fig. 5 is the semisectional view of the lift block with rectangular channel of the present invention;
Fig. 6 is the plan structure schematic diagram of the lift block with rectangular channel of the present invention;
Fig. 7 is the semisectional view of the lift block with serrate slot of the present invention;
Fig. 8 is the plan structure schematic diagram of the lift block with serrate slot of the present invention;
In figure, 1 is counterweight and scale pan, and 2 is fixed pulley, and 3 is stay cord, and 4 is pulling force sensor, and 5 is lift block, and 6 is magnetorheological liquid bath, and 7 is permanent magnet grid groove, and 8 is dull and stereotyped, and 9 is piston rod, and 10 is cylinder barrel, and 11 is base, and 12 is arc-shaped permanent magnet.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
A kind of two pulling force sources formula magnetic flow liquid yield stress measuring system, as shown in Figure 1, comprises jacking gear, field generator for magnetic and lift block 5.Field generator for magnetic as shown in figures 2-3, be made up of radial multi-stage magnet ring and magnetorheological liquid bath 6, radial multi-stage magnet ring is made up of multiple coaxial radial multi-stage magnet ring unit arranged of a plane that is positioned at, radial multi-stage magnet ring unit is circular, surrounded by multiple arcuation permanent magnet 12, arcuation permanent magnet 12 is placed in permanent magnet grid groove 7, and permanent magnet grid groove 7 is fixed on dull and stereotyped 8, can be changed the size of magnetic field intensity by the number increasing or reduce radial multi-stage magnet ring unit.Magnetorheological liquid bath 6 cylindrically, is positioned at radial multi-stage magnet ring, coaxially arranges with radial multi-stage magnet ring.Field generator for magnetic horizontal positioned, bottom is provided with jacking gear, and jacking gear as shown in Figure 4, is hydraulic package, and hydraulic package comprises piston rod 9 and cylinder barrel 10, and hydraulic package is vertically placed, and top is fixed with the lower surface of flat board 8, and bottom is fixing on the pedestal 11.Lift block 5 is in cylindric, external diameter 8mm less of the internal diameter of magnetorheological liquid bath 6, coaxially arrange with magnetorheological liquid bath 6, the axle place rectilinear motion along magnetorheological liquid bath 6 is drawn by stay cord 3, lift block 5 side be provided with multiple along lift block 5 axis direction arrange around its side rectangular channel of a week, as shown in Fig. 5 ~ 6, the width of rectangular channel is 1mm, and the degree of depth is 1mm.Stay cord 3 is provided with pulling force sensor 4, and stay cord 3 one end is connected with the top of lift block 5, and the other end is walked around two fixed pulleys 2 and hung counterweight and scale pan 1.This system is also provided with the rope clamp of fixed pulling rope 3 and the apparatus for controlling of lifting for controlling elevating mechanism.
When measuring magnetic flow liquid yield stress, fixing jacking gear, making it not move up and down; Insert in magnetic flow liquid by lift block 5, scale pan is with the stay cord 3 walking around fixed pulley 2 and pulling force sensor 4 and lift block 5 and be connected, by adding the pulling force that counterweight applies upwards to lift block 5; Measure pulling force used with pulling force sensor 4, the yield stress of magnetic flow liquid can be conversed.
Embodiment 2
The present embodiment and embodiment are substantially identical, and difference is, the side of the pulling block 5 in the present embodiment be provided with that multiple axis direction along lift block 5 arranges around its side serrate slot of a week, as shown in Fig. 7 ~ 8, the width of serrate slot is 2mm, and the degree of depth is 1mm.The method measured measuring magnetic flow liquid yield stress is similar to Example 1.
Embodiment 3
One two pulling force sources formula magnetic flow liquid yield stress measuring system of the present embodiment is substantially the same manner as Example 1, difference is, measuring in the present embodiment in the method measuring magnetic flow liquid yield stress is lift block 5 is inserted the stay cord 3 fixed after in magnetic flow liquid on fixed pulley 2, it is made not to be moved, start jacking gear, its uniform speed slow is declined, relative tension is produced to lift block 5, pulling force sensor 4 measures pulling force size, can converse the yield stress of magnetic flow liquid.
Embodiment 4
The present embodiment is substantially the same manner as Example 1, and the external diameter that difference is to lift in the present embodiment block 5 is 1/2 of magnetorheological liquid bath 6 internal diameter; The degree of depth of rectangular channel is 1/50 of lift block 5 bottom surface radius, and width is 1/100 of lift block 5 profile height.
Embodiment 5
The present embodiment is substantially the same manner as Example 1, and the external diameter that difference is to lift in the present embodiment block 5 is 9/10 of magnetorheological liquid bath 6 internal diameter; The degree of depth of rectangular channel is 1/5 of lift block 5 bottom surface radius, and width is 1/5 of lift block 5 profile height.
Claims (10)
1. two pulling force sources formula magnetic flow liquid yield stress measuring system, it is characterized in that, comprise jacking gear, field generator for magnetic and lift block, described field generator for magnetic is made up of radial multi-stage magnet ring and magnetorheological liquid bath, described magnetorheological liquid bath cylindrically, be positioned at radial multi-stage magnet ring, coaxially arrange with radial multi-stage magnet ring; Described field generator for magnetic horizontal positioned, bottom is provided with jacking gear, and lift block is cylindric, external diameter is less than the internal diameter of magnetorheological liquid bath, coaxially arrange with magnetorheological liquid bath, by the axle place rectilinear motion of stay cord traction along magnetorheological liquid bath, stay cord is provided with pulling force sensor.
2. one according to claim 1 two pulling force sources formula magnetic flow liquid yield stress measuring system, it is characterized in that, described radial multi-stage magnet ring is made up of multiple coaxial radial multi-stage magnet ring unit arranged of a plane that is positioned at, described radial multi-stage magnet ring unit is circular, is surrounded by multiple arcuation permanent magnet; Described arcuation permanent magnet is placed in permanent magnet grid groove, and permanent magnet grid groove is fixed on flat board.
3. one according to claim 2 two pulling force sources formula magnetic flow liquid yield stress measuring system, it is characterized in that, described jacking gear is hydraulic package, described hydraulic package comprises piston rod and cylinder barrel, hydraulic package is vertically placed, top is fixed with dull and stereotyped lower surface, and bottom is fixed on base.
4. one according to claim 1 two pulling force sources formula magnetic flow liquid yield stress measuring system, it is characterized in that, the external diameter of described lift block is 1/2 ~ 9/10 of magnetorheological liquid bath internal diameter.
5. one according to claim 1 two pulling force sources formula magnetic flow liquid yield stress measuring system, it is characterized in that, the side of described lift block is provided with around its side rectangular channel of a week or serrate slot.
6. one according to claim 5 two pulling force sources formula magnetic flow liquid yield stress measuring system, it is characterized in that, described rectangular channel or serrate slot are provided with multiple, and the axis direction along lift block is arranged.
7. the two pulling force sources of the one according to claim 5 or 6 formula magnetic flow liquid yield stress measuring system, it is characterized in that, described rectangular channel or the degree of depth of serrate slot are 1/50 ~ 1/5 of lift block bottom surface radius, and width is 1/100 ~ 1/5 of lift block profile height.
8. one according to claim 1 two pulling force sources formula magnetic flow liquid yield stress measuring system, is characterized in that, described stay cord one end is connected with the top of lift block, and the other end is walked around fixed pulley and hung weight.
9. one according to claim 8 two pulling force sources formula magnetic flow liquid yield stress measuring system, it is characterized in that, described weight comprises the counterweight in scale pan and scale pan.
10. one according to claim 1 two pulling force sources formula magnetic flow liquid yield stress measuring system, is characterized in that, also comprising for the rope clamp of fixed pulling rope and the apparatus for controlling of lifting for controlling elevating mechanism.
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| CN201510967974.1A CN105547923B (en) | 2015-12-21 | 2015-12-21 | A kind of double pulling force source formula magnetorheological fluid yield stress measuring systems |
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| CN105547923B CN105547923B (en) | 2018-05-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769412A (en) * | 2016-12-26 | 2017-05-31 | 邱艳 | A kind of waste steel bar compression verifying attachment for building |
| CN110095220A (en) * | 2019-05-22 | 2019-08-06 | 上海应用技术大学 | A kind of Shear Yield Stress of Magnetorheological Fluids measuring device |
| CN112016805A (en) * | 2020-07-23 | 2020-12-01 | 上海工程技术大学 | Magnetorheological fluid performance evaluation method and system |
| CN112858100A (en) * | 2021-01-15 | 2021-05-28 | 上海工程技术大学 | Lifting type magnetorheological fluid yield stress measuring device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769412A (en) * | 2016-12-26 | 2017-05-31 | 邱艳 | A kind of waste steel bar compression verifying attachment for building |
| CN106769412B (en) * | 2016-12-26 | 2019-05-10 | 江苏苏南建筑安装工程有限公司 | A kind of waste steel bar compression verifying attachment for building |
| CN110095220A (en) * | 2019-05-22 | 2019-08-06 | 上海应用技术大学 | A kind of Shear Yield Stress of Magnetorheological Fluids measuring device |
| CN112016805A (en) * | 2020-07-23 | 2020-12-01 | 上海工程技术大学 | Magnetorheological fluid performance evaluation method and system |
| CN112016805B (en) * | 2020-07-23 | 2023-06-06 | 上海工程技术大学 | Magnetorheological fluid performance evaluation method and system |
| CN112858100A (en) * | 2021-01-15 | 2021-05-28 | 上海工程技术大学 | Lifting type magnetorheological fluid yield stress measuring device |
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