CN109709156A - Magnetorheological fluid sedimentation system safety testing device and test method - Google Patents
Magnetorheological fluid sedimentation system safety testing device and test method Download PDFInfo
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- CN109709156A CN109709156A CN201910065541.5A CN201910065541A CN109709156A CN 109709156 A CN109709156 A CN 109709156A CN 201910065541 A CN201910065541 A CN 201910065541A CN 109709156 A CN109709156 A CN 109709156A
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- magnetorheological fluid
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Abstract
The present invention proposes a kind of magnetorheological fluid sedimentation system safety testing device and test method, comprising: homogeneous constant magnetic field generation device, the magnetorheological fluid container being arranged in the effective output area of homogeneous constant magnetic field generation device, the multipair ohmmeter that resistance between the conductive sheet of different height and each pair of conductive sheet of measurement in magnetorheological fluid container is arranged in.It is using under identical magnetic field strength, the rheological effect of magnetorheological fluid makes magnetic-particle arrange the chain structure to be formed by magnetic direction, make magnetorheological fluid that there is certain electric conductivity, and the characteristic that its resistance is reduced with the increase of granule density, have devised the case where changing with time by comparing the resistance of magnetorheological fluid different location, method to characterize magnetorheological fluid sedimentation process, to obtain the desired technical of the settling property of evaluation magnetorheological fluid materials.
Description
Technical field
The present invention relates to material property detection field more particularly to magnetorheological fluid sedimentation system safety testing device and test methods.
Background technique
Magnetorheological fluid is generally by non-magnetic carrier fluid, high magnetic conductivity, low hysteresis micron particles (common carbonyl iron
Powder), and the functional additive composition for improving certain performances.In the state of not applying magnetic field, magnetorheological fluid is presented
The Newtonian fluid characteristic of low viscosity, even particulate dispersion is in carrier fluid.When applying the magnetic field of some strength, ferromagnetic particle
Magnetization form magnetic dipole and obtain dipole moment, under the action of magnetic moment particle along external magnetic field direction directed movement and formed
Chain structure makes magnetorheological fluid have certain anti-shear ability and electric conductivity, and when removing externally-applied magnetic field, magnetorheological fluid restores
To static condition.This characteristic of magnetorheological fluid makes it have the response time fastly with good controllability, is widely used in damping
The every field such as device, damper, brake.
Currently, magnetorheological fluid differs with carrier fluid about seven times of density contrast due to magnetic-particle, there are particle sedimentation phenomenon,
Sedimentation phenomenon is one of limitation widely applied main problem of magnetorheological fluid.Magnetorheological fluid sedimentation can reduce its working performance, sternly
It even fails when weight, so carrying out performance evaluation to it for the magnetorheological fluid for wanting the moment to keep working performance and stand for a long time
It is even more important, visual method is often used to the method for magnetorheological fluid sedimentation test instantly, inductance method monitors.Visual method can obtain
The relationship of mud line displacement and time, calculates the rate of settling of mud line under each initial concentration, but the method can only monitor transparent magnetic
Rheology liquid infall process, and the sedimentation information of the following all areas of mud line can not be directly obtained, and measure time-consuming, error
Greatly.The magnetic conductivity that magnetorheological fluid is utilized in inductance method reduces with the decline of particle volume, makes the solenoid for surrounding this section of liquid
The inductance of inductance coil reduces therewith, and structure is complicated for this method, and operation experiments are cumbersome, and inductance sensor monitors the movement of position
Error is big, while to the sensitivity requirement of electric inductance measuring-testing instrument height.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of accurate positioning test, structure are simple, at low cost, easy to use
Magnetorheological fluid sedimentation system safety testing device and its method, the present invention specifically use following scheme:
A kind of magnetorheological fluid sedimentation system safety testing device characterized by comprising homogeneous constant magnetic field generation device is arranged in institute
State in the effective output area of homogeneous constant magnetic field generation device (can generate when i.e. homogeneous constant magnetic field generation device works normally
The region of uniform magnetic field) magnetorheological fluid container, it is multipair be arranged in the conductive sheet of different height in magnetorheological fluid container, with
And measure the ohmmeter of resistance between each pair of conductive sheet.
Preferably, the magnetic induction line of homogeneous constant magnetic field produced by the homogeneous constant magnetic field generation device is level；It is described
Magnetorheological fluid container is to be vertically arranged；Each pair of conductive sheet is contour, equidistant and arranged in parallel.
Preferably, the homogeneous constant magnetic field generation device is the magnetizer for being wound with magnet exciting coil, and the magnetizer is C
The both ends of font, the magnet exciting coil are connect with DC current source；The opening of magnetizer is arranged in the magnetorheological fluid container.
Preferably, the conductive sheet shares three pairs, be separately positioned on magnetorheological fluid container contain the top in liquid zone domain, middle part and
Lower part, three ohmmeters pass through conducting wire respectively and connect with each pair of conductive sheet.
Preferably, silicon steel sheet and the insulation tree that is arranged in adjacent two panels silicon steel sheet between of the magnetizer by intersecting
Rouge layer is constituted.
Preferably, the magnetorheological fluid container is fixed by the bracket.
And a kind of test method of magnetorheological fluid sedimentation, which comprises the following steps:
Step S1: it is poured into magnetorheological fluid container and has demarcated grain volume fraction and uniform magnetorheological fluid sample, and in magnetic
The multipair conductive sheet positioned at different height under magnetorheological fluid sample liquid level of setting in rheology liquid container；
Step S2: magnetorheological fluid container is put into effective output area of homogeneous constant magnetic field generation device；
Step S3: as initial time at the time of after standing using magnetorheological fluid sample, homogeneous constant is generated at each measurement moment
Magnetic field measures resistance value between each pair of conductive sheet by ohmmeter, and records each resistance value at subsequent measurement moment.
Preferably, step S3 continues until each resistance value is no longer changed at any time.
Preferably, in step sl, each pair of conductive sheet is contour, equidistant and arranged in parallel.
Preferably, the homogeneous constant magnetic field passes through the magnetizer for being wound with magnet exciting coil being vertically arranged and generates；It is described
Magnetizer is C font, and the both ends of the magnet exciting coil are connect with DC current source；The magnetorheological fluid container, which is vertically arranged in, leads
The opening of magnet；The conductive sheet is vertical with the setting plane of magnetizer.
The device and method that the present invention and its preferred embodiment provide, using under identical magnetic field strength, magnetorheological fluid
Rheological effect makes magnetic-particle arrange the chain structure to be formed by magnetic direction, and magnetorheological fluid is made to have certain electric conductivity, and
Its resistance characteristic reduced with the increase of granule density, have devised resistance by comparing magnetorheological fluid different location with
The case where variation of time, the method to characterize magnetorheological fluid sedimentation process, to obtain the heavy of evaluation magnetorheological fluid materials
The desired technical of performance drops.
Compared with prior art, the present invention has following benefit: test device structure is simple, and it is convenient to realize, low in cost,
It is practical.Test method overcomes the defect of visual method, can not only monitor transparent magnetorheological fluid, is also applied for nontransparent
Magnetorheological fluid, and the sedimentation situation of mud line following region can be monitored, and this method, relative to inductance method, experimental implementation is more
Simply, data testing accuracy is improved, it is made to can be widely applied to the superior and inferior evaluating to magnetorheological fluid sedimentation performance.
Detailed description of the invention
The present invention is described in more detail with reference to the accompanying drawings and detailed description:
Fig. 1 is overall structure diagram of the embodiment of the present invention；
Figure label explanation: 1- DC current source；2- magnet exciting coil；3- magnetizer；The upper conductive sheet of 4-；
Conductive sheet in 5-；Conductive sheet under 6-；7- ohmmeter；8- bracket；
9- magnetorheological fluid container.
Specific embodiment
For the feature and advantage of this patent can be clearer and more comprehensible, special embodiment below, and cooperate attached drawing, make specifically
It is bright as follows:
As shown in Figure 1, the present embodiment device includes: the magnetizer 3 of C font and the magnet exciting coil 2 being wrapped on magnetizer 3, encourage
2 both ends of magnetic coil are connect with DC current source 1, and 3 opening of magnetizer is equipped with magnetorheological fluid container 9 and for fixing magnetorheological fluid
The bracket 8 of container 9, the upper conductive sheet 4 being positioned in magnetorheological fluid container 9 pair, middle conductive sheet 5, lower conductive sheet 6, are metal
Material, each pair of conductive sheet is preferably contour, equidistant and arranged in parallel, and it is each right for measuring to be equipped with by the opening of magnetizer 3
The ohmmeter 7 of resistance between conductive sheet.
In the present embodiment, pairs of upper conductive sheet 4, middle conductive sheet 5, lower conductive sheet 6 are pairs of respectively is placed on magnetic current
Become the different height in the upper, middle and lower of liquid container 9, infall process of the monitoring magnetorheological fluid in different height.Pairs of upper conductive sheet
4, middle conductive sheet 5, it is each in lower conductive sheet 6 connected between two conductive sheets with conducting wire, ohmmeter 7 is all set on the conducting wire.
Because under the action of applying external magnetic field, the chain structure of magnetorheological fluid particle has magnetorheological fluid centainly
Electric conductivity.With the generation of magnetorheological fluid sedimentation, magnetic-particle continues to decline at any time, until it is deposited in container bottom, and
Under external magnetic field, the magnetorheological fluid resistance that throughout conductive sheet measures changes also with the infall process of particle.Magnetic
Upper 4 resistance of conductive sheet is gradually increased in rheology liquid, and when settling and starting significant change does not occur for middle 5 resistance of conductive sheet, then by
Cumulative big, lower 6 resistance of conductive sheet then first significantly decreases trend, then tend towards stability, and finally throughout conductive sheet measures
Resistance is all consistent in the state of whether there is or not magnetic field, i.e., resistance no longer responds externally-applied magnetic field variation everywhere, and magnetorheological fluid is lost the job
Performance.
In the present embodiment, the effect of magnetizer 3 and magnet exciting coil 2 is to provide for that the uniform of the above effect can be triggered
Stationary magnetic field, according to design provided in this embodiment, magnetizer 3 is regarded as uniform magnetic in the induced magnetic field that opening generates
?；The magnetizer 3 is superimposed by silicon steel sheet, and adjacent two panels silicon steel sheet is mutually bonded by intermediate insulating resin, and use is insulated from each other
Silicon steel sheet stack at the beneficial effect as field core be its saturation induction density with higher, it is cheap, simultaneously
Play the role of reducing vortex in the circuit of thin-and-long.DC current source 1 then ensure that the constant of magnetic field, so as to realize
The control of measurand.Certainly, the design scheme of this kind of homogeneous constant magnetic field is not the unique selection for realizing the object of the invention, is led to
Homogeneous constant magnetic field, but this reality can also be constructed by crossing other design schemes such as pairs of strip permanent magnet, parallel electrically conductive metal plate
It is preferable to apply example offer scheme measured result.
The electric current that DC current source 1 generates generates induced magnetic field by magnet exciting coil 2 inside magnetizer 3, incudes magnetic
Field is constrained on inside magnetizer and is vertically pierced by an open end of magnetizer, and sequentially passes through magnetorheological fluid and hold
9 outer wall of device, conductive sheet, magnetorheological fluid, another conductive sheet in a pair of conductive piece, 9 other side outer wall of magnetorheological fluid container, finally
The magnetic loop for forming closure is vertically penetrated inside magnetizer from another open end of magnetizer, is measured using ohmmeter 7
Pass through the resistance at the conductive sheet both ends of induced magnetic field.
The present embodiment device overcomes the defect of common visual method and inductance method, and structure is simple, at low cost, experimental implementation letter
Just.Using electric conductivity of the magnetorheological fluid under externally-applied magnetic field, between the conductive sheet in different time periods by measuring different location
Resistance monitor its infall process, determine the working performance of magnetorheological fluid.This method clear principle is simple, device operation letter
Single, the data precision of acquisition is high, it is made to can be widely applied to the superior and inferior evaluating to magnetorheological fluid sedimentation performance.
Based on apparatus above, it is possible thereby to realize the test of magnetorheological fluid sedimentation, test method includes the present embodiment
Following steps:
A is poured into magnetorheological fluid container 9 and has been demarcated grain volume fraction and uniform magnetorheological fluid sample；
B, adjustment magnetizer 3 are vertically arranged, and magnetorheological fluid container 9 is put into the opening of magnetizer 3 and is placed on bracket 8 vertically
On, in order to guarantee that magnetic field's regularity, magnetorheological fluid container 9 are preferably disposed on the plane of symmetry of magnetizer 3 as far as possible；
C connects the DC current source 3 of magnet exciting coil 2 as initial time at the time of using after magnetorheological fluid sample standing, to produce
Raw homogeneous constant magnetic field, adjustable magnetizer 3 is placed in the location of each pairs of conductive sheet in magnetorheological fluid at this time, and makes to encourage
Magnetic coil 2, which is powered in each position and generates induced magnetic field inside magnetizer, passes through conductive sheet, passes perpendicularly through conduction with magnetic induction line
Piece, i.e. conductive sheet are vertical with the setting plane of magnetizer 3 to be preferred, and measures resistance value between each pair of conductive sheet by ohmmeter 7.
D hereafter different time points, only connects the DC current source of magnet exciting coil 2 when needing to measure resistance
3, (ensuring that magnetic field will not impact normal infall process) is disconnected at remaining moment, and repeat above-mentioned measurement resistance step
Suddenly, and record the reading of magnetorheological fluid each moment each ohmmeter 7, by each resistance value change with time situation reflect it is magnetorheological
The infall process of fluid samples.The measurement continues to each resistance value to be no longer changed that (variation occurred is small to arrive at any time
Can not be measured) until, at this time it is considered that each resistance value will not change at any time, i.e., infall process is complete
At.
This patent is not limited to above-mentioned preferred forms, anyone can obtain other each under the enlightenment of this patent
The magnetorheological fluid sedimentation system safety testing device and test method of kind form, all equivalent changes done according to scope of the present invention patent
With modification, it should all belong to the covering scope of this patent.
Claims (10)
1. a kind of magnetorheological fluid sedimentation system safety testing device characterized by comprising homogeneous constant magnetic field generation device, setting exist
Magnetorheological fluid container, multipair setting in the effective output area of homogeneous constant magnetic field generation device is in magnetorheological fluid container
The ohmmeter of resistance between the conductive sheet and each pair of conductive sheet of measurement of different height.
2. magnetorheological fluid sedimentation system safety testing device according to claim 1, it is characterised in that: the homogeneous constant magnetic field produces
The magnetic induction line of homogeneous constant magnetic field produced by generating apparatus is level；The magnetorheological fluid container is to be vertically arranged；Each pair of conductive sheet
It is contour, equidistant and arranged in parallel.
3. magnetorheological fluid sedimentation system safety testing device according to claim 1, it is characterised in that: the homogeneous constant magnetic field produces
Generating apparatus is the magnetizer for being wound with magnet exciting coil, and the magnetizer is C font, the both ends of the magnet exciting coil and DC current
Source connection；The opening of magnetizer is arranged in the magnetorheological fluid container.
4. magnetorheological fluid sedimentation system safety testing device according to claim 1, it is characterised in that: the conductive sheet shares three
It is right, it is separately positioned on the upper, middle and lower that magnetorheological fluid container contains liquid zone domain, three ohmmeters pass through conducting wire and every respectively
Conductive sheet is connected.
5. magnetorheological fluid sedimentation system safety testing device according to claim 3, it is characterised in that: the magnetizer is by cross-bedding
Folded silicon steel sheet and the insulating resin layer being arranged between adjacent two panels silicon steel sheet are constituted.
6. -5 any magnetorheological fluid sedimentation system safety testing device according to claim 1, it is characterised in that: the magnetic current
Become liquid container to be fixed by the bracket.
7. a kind of test method of magnetorheological fluid sedimentation, which comprises the following steps:
Step S1: it is poured into magnetorheological fluid container and has demarcated grain volume fraction and uniform magnetorheological fluid sample, and in magnetic
The multipair conductive sheet positioned at different height under magnetorheological fluid sample liquid level of setting in rheology liquid container；
Step S2: magnetorheological fluid container is put into effective output area of homogeneous constant magnetic field generation device；
Step S3: as initial time at the time of after standing using magnetorheological fluid sample, homogeneous constant is generated at each measurement moment
Magnetic field measures resistance value between each pair of conductive sheet by ohmmeter, and records each resistance value at subsequent measurement moment.
8. the test method of magnetorheological fluid sedimentation according to claim 7, it is characterised in that: step S3 continues to each electricity
Until resistance value is no longer changed at any time.
9. the test method of magnetorheological fluid sedimentation according to claim 7, it is characterised in that: in step sl, each pair of
Conductive sheet is contour, equidistant and arranged in parallel.
10. according to the test method of any magnetorheological fluid sedimentation of claim 7-9, it is characterised in that: described
Homogeneous constant magnetic field passes through the magnetizer for being wound with magnet exciting coil being vertically arranged and generates；The magnetizer is C font, described to encourage
The both ends of magnetic coil are connect with DC current source；The magnetorheological fluid container is vertically arranged in the opening of magnetizer；It is described to lead
Electric piece is vertical with the setting plane of magnetizer.
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| CN201910065541.5A CN109709156A (en) | 2019-01-24 | 2019-01-24 | Magnetorheological fluid sedimentation system safety testing device and test method |
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| CN201910065541.5A CN109709156A (en) | 2019-01-24 | 2019-01-24 | Magnetorheological fluid sedimentation system safety testing device and test method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111812566A (en) * | 2020-07-15 | 2020-10-23 | 沈阳工业大学 | System and method for measuring magnetic properties of liquid material |
| CN113008939A (en) * | 2019-12-18 | 2021-06-22 | 财团法人工业技术研究院 | Electromagnetic characteristic measuring device and system and electromagnetic characteristic measuring method |
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| CN2752769Y (en) * | 2004-11-29 | 2006-01-18 | 关新春 | Magnetic current varying liquid sedimentation layered tester |
| CN103635288A (en) * | 2011-04-13 | 2014-03-12 | Qed技术国际股份有限公司 | Method and apparatus for measurement and control of magnetic particle concentration in a magnetorheological fluid |
| CN106546517A (en) * | 2016-09-29 | 2017-03-29 | 中国农业大学 | Magnetorheological fluid sedimentation process electric capacity monitoring device and monitoring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113008939A (en) * | 2019-12-18 | 2021-06-22 | 财团法人工业技术研究院 | Electromagnetic characteristic measuring device and system and electromagnetic characteristic measuring method |
| CN111812566A (en) * | 2020-07-15 | 2020-10-23 | 沈阳工业大学 | System and method for measuring magnetic properties of liquid material |
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Application publication date: 20190503 |