CN104048903A - Magnetorheological fluid sedimentation rate determination instrument and determination method thereof - Google Patents
Magnetorheological fluid sedimentation rate determination instrument and determination method thereof Download PDFInfo
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- CN104048903A CN104048903A CN201410298389.2A CN201410298389A CN104048903A CN 104048903 A CN104048903 A CN 104048903A CN 201410298389 A CN201410298389 A CN 201410298389A CN 104048903 A CN104048903 A CN 104048903A
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- magnetorheological fluid
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Abstract
The invention discloses a magnetorheological fluid sedimentation rate determination instrument and a determination method thereof. The magnetorheological fluid sedimentation rate determination instrument comprises an inductance sensor and a test tube used for containing a magnetorheological fluid. The determination method comprises the steps of vertically arranging the test tube; arranging the inductance sensor outside the test tube, which is adjustable in height, and placing the inductance sensor until a sleeve cylinder is fixed after pouring a magnetorheological fluid sample with a calibrated volume in the test tube; downwards moving a distance s along a height meter by using a place in which the inductance sensor is flush with the liquid level in the test tube as an initial position, and meanwhile, starting a computer for performing inductance signal processing, data recording and diagraph analysis; obtaining a time t spent by reducing a sedimentation stratification line to the inductance sensor, then figuring out a sedimentation rate s/t, skillfully determining a time when the sedimentation stratification line passes through a position by using a principle of changing over the concentration of ferromagnetic particles therein by using the inductance intensity of the magnetorheological fluid and specially changing the concentration of the ferromagnetic particles when the sedimentation stratification layer passes through the determined position, and figuring out a sedimentation rate for evaluating the sedimentation performance of the magnetorheological fluid material.
Description
Technical field
The present invention relates to a kind of testing tool and method of testing, relate in particular to a kind of magnetorheological fluid sedimentation rate determination instrument and assay method thereof.
Background technology
Magnetic flow liquid is as a kind of intellectual material with studying in widespread attention, its ultimate principle is that magnetic-particle (being generally carbonyl iron dust) is dispersed in water, wet goods carrier fluid, add again some adjuvant evenly to mix, just in outside magnetic field, just show the controlled phenomenon of damping of Millisecond yardstick, be embodied in, along with magnetic field increases gradually from zero, it is changed to semisolid from Newtonian liquid figure, and this process is reversible.This typical characteristics is allowed to condition at nearly all high-performance that need such as vehicle, exact instrument and possesses wide application prospect every the occasion of vibration damping, such as automotive semi-active suspension, Intelligent seat, buildings earthquake vibration isolation etc.Because the main composition composition magnetic-particle of magnetic flow liquid and the density difference between carrier fluid are apart from great disparity (as carbonyl iron dust and oil base carrier fluid density difference are about 7 times), thereby inevitably there is more serious settlement issues, be embodied in magnetic-particle, especially on top, form stratification line clearly.The settlement issues of magnetic flow liquid is to limit at present one of its extensive practical main bugbear, main manifestations is that after a period of time sedimentation, larger variation occurs its rheological parameter, thereby hydraulic performance decline, also to control system, bring puzzlement, therefore the settling property evaluation of magnetic current sex change is seemed to especially necessary.At present the evaluation method of magnetorheological fluid sedimentation performance is mainly within a certain period of time by the visual displacement that records stratification line, calculates thus the rate of descent in the unit interval.Because stratification line displacement is slow, obvious visual meeting causes great error, thereby can not carry out to different magnetic flow liquid samples the comparative evaluation of science.Chinese patent " 200420063877.7 " utilizes external magnet to produce magnetic field and near magnet, places the magnetic field intensity of the diverse location of the vessel that teslameter measurement is equipped with magnetic flow liquid.This invention has utilized magnetic permeability in magnetic flow liquid to be decided by the principle of magnetic-particle concentration, attempts drawing magnetic-particle concentration by measured magnetic field intensity, and recycling differing heights, different time institute measured value draw sedimentation layering situation.Yet although there is inevitable contacting between magnetic field intensity and magnetic permeability, how this invention not explanation draws the relation between magnetic field intensity or magnetic permeability and magnetic-particle concentration, thereby can not draw magnetic-particle concentration relation over time.This invention does not also provide the concrete grammar of how accurately judging stratification line position, and due to the regular moving magnet of needs, has caused thus positioning error, complicated operation.In addition this contrive equipment structure is not compact, needs mobile parts too much, such as be difficult to guarantee that teslameter is in apart from the identical position of vessel and angle, to cause error at every turn.Chinese patent " 201110003447.0 " employing X-ray emission coefficient and imaging system obtain the distribution situation of magnetic-particle concentration in container, also can obtain the positional information of stratification line, yet X-ray system is too expensive and complicated, also has processing safety problem.The people such as the Chen Lesheng of Shanghai Communications University have delivered the article of a piece " inductance method is measured the research of magnetorheological fluid sedimentation coefficient ", this article based on prerequisite be the test tube height long enough of hypothesis splendid attire magnetic flow liquid, think along with (occurring hyaline layer on top) occurs in sedimentation, magnetic flow liquid concentration below hyaline layer is constant, and this hypothesis does not square with the fact, and need prior mobile inductance sensor demarcate the relation between inductance and displacement while measuring, again magnetic flow liquid liquid level is arranged in inductance sensor, the relation of demarcating before then utilizing obtains the triggered time, in mensuration process, inductance sensor drives motion by coordinate translation platform, complex structure, error is large.
Therefore, need a kind of novel magnetorheological fluid sedimentation rate determination instrument and assay method, to make up the deficiencies in the prior art, simplified structure, reduces error, improves and measures precision, reduces equipment cost.
Summary of the invention
In view of this, the object of this invention is to provide that a kind of accurate quantification is measured, magnetorheological fluid sedimentation rate determination instrument and assay method thereof easy and simple to handle.
Magnetorheological fluid sedimentation rate determination instrument of the present invention, comprises inductance sensor and for holding the test tube of magnetic flow liquid; Described test tube is vertically placed; Described inductance sensor is located at test tube outside and highly adjustable;
Further, also comprise base; Described base is provided with for ferrule sleeve fixing and support test tube;
Further, also comprise shaft-like altitude gauge, described altitude gauge vertically arranges and is fixed on base;
Further, described inductance sensor is set in test tube outside and is installed on altitude gauge in adjustable for height mode;
Further, also comprise for the inductance signal to inductance sensor process, the computing machine of data recording and mapping analysis;
Further, described inductance sensor comprises shell and inductive coil; Described inductive coil is circumferentially wound around along test tube; Described shell is coated on inductive coil outside in the form of a ring; Shell adopts high permeability material to make;
Further, described shell diameter of bore and ferrule sleeve diameter of bore equate with test tube external diameter;
Further, described number of inductive coil turns is 300～600 circles; Described shell axial length is 5～30mm;
The assay method of magnetorheological fluid sedimentation rate determination instrument of the present invention, comprises the following steps:
A, pours the magnetic flow liquid sample having stirred of demarcating volume in vitro into;
B, puts into inductance sensor also until ferrule sleeve is fixed by test tube;
C, moves down inductance sensor apart from s as initial position along altitude gauge with the equal place of liquid level in vitro, open simultaneously computing machine to the inductance signal of inductance sensor process, data recording and mapping analysis;
D, obtains according to inductance signal and time chart the time t that sedimentation stratification line is down to inductance sensor place experience, and calculating thus subsidence rate is s/t;
Further, change s value repeating step c and d calculated settlement speed average value.
Magnetorheological fluid sedimentation rate determination instrument of the present invention and assay method thereof, utilize ferromagnetic particle concentration change wherein of magnetic flow liquid inductance intensity and change and determine position sedimentation stratification line by time ferromagnetic particle concentration (that is inductance intensity) there is the principle of special variation, position more than sedimentation stratification line, along with sedimentation stratification line continues to decline, magnetic-particle content total in inductance sensor declines, and its inductance value recording is along with time remaining declines; And position below sedimentation stratification line (as long as sedimentation stratification line does not also arrive this place), due to the almost vanishing of the above magnetic-particle concentration of sedimentation stratification line, cause thus the magnetic-particle concentration below sedimentation stratification line to rise, the magnetic-particle content in this place's inductance sensor rises, and its inductance value recording is along with time remaining rises.Thereby keep inductance sensor in suitable known location, when sedimentation stratification line moves down and passes through this position from initial liquid level position, the special Changing Pattern of its measured inductance value experience first increases and then decreases, and maximal value place appears at sedimentation stratification line by the moment of this position.The displacement of known sedimentation stratification line and institute's elapsed-time standards, can calculate subsidence rate thus, and it is simple in structure, compact, easy and simple to handle, measures precision high, and equipment cost is low.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is inductance value and time chart.
Embodiment
Fig. 1 is structural representation of the present invention, and Fig. 2 is inductance value and time chart, as shown in the figure: the magnetorheological fluid sedimentation rate determination instrument of the present embodiment, comprises inductance sensor 1 and for holding the test tube 2 of magnetic flow liquid 3; Described test tube 2 is vertically placed; Described inductance sensor 1 is located at test tube 2 outsides and highly adjustable, utilize ferromagnetic particle concentration change wherein of magnetic flow liquid 3 inductance intensities and change and determine position sedimentation stratification line by time ferromagnetic particle concentration (that is inductance intensity) there is the principle of special variation, position more than sedimentation stratification line, along with sedimentation stratification line continues to decline, the interior total magnetic-particle content of inductance sensor 1 declines, and its inductance value recording is along with time remaining declines; And position below sedimentation stratification line (as long as sedimentation stratification line does not also arrive this place), due to the almost vanishing of the above magnetic-particle concentration of sedimentation stratification line, cause thus the magnetic-particle concentration below sedimentation stratification line to rise, the magnetic-particle content in this place's inductance sensor 1 rises, and its inductance value recording is along with time remaining rises.Thereby keep inductance sensor 1 in suitable known location, when sedimentation stratification line moves down and passes through this position from initial liquid level position, the special Changing Pattern of its measured inductance value experience first increases and then decreases, and maximal value place appears at sedimentation stratification line by the moment of this position.The displacement of known sedimentation stratification line and institute's elapsed-time standards, can calculate subsidence rate thus.Inductance sensor 1 is located at test tube 2 outsides and is directly obtained inductance signal, do not need extra acquisition sensor as teslameter etc., and only need faint electric current can obtain good inductance signal, can ignore the impact of inductance sensor 1 on magnetic flow liquid 3 settling characters own.Its compact conformation, easy and simple to handle, measure precision high, equipment cost is low; Can directly inductance sensor 1 be installed on to test tube 2 walls in adjustable for height mode, for example, sucker be installed on inductance sensor 1 and it is adsorbed and be fixed on test tube 2 walls by sucker, then test tube 2 is positioned on 2, existing test tube and make its vertical display; A special-purpose test tube flat also can corresponding test tube 2 be set fixing test tube 2 is carried out vertically support, and inductance sensor 1 is installed on to this test tube flat to maintain the relative position between inductance sensor 1 and test tube 2 in adjustable for height mode; The signal that can produce inductance sensor 1 by existing equipments such as computers records, processing and mapping analysis, so that obtain the time that sedimentation stratification line is down to inductance sensor 1 place experience.
In the present embodiment, also comprise base 7; Described base 7 is provided with for ferrule sleeve 8 fixing and support test tube 2; Can place test tube 2 the reliable positional precision that guarantees test tube 2, and then guarantee to measure precision.
In the present embodiment, also comprise shaft-like altitude gauge 5, described altitude gauge 5 vertically arranges and is fixed on base 7, and altitude gauge 5 is provided with scale, so respective heights meter 5 can be read inductance sensor 1 fast to the distance of liquid level.
In the present embodiment, described inductance sensor 1 is set in test tube 2 outsides and is installed on altitude gauge 5 in adjustable for height mode, and inductance sensor 1 is provided with mount pad 4 and is installed on altitude gauge 5 by this mount pad 4; Altitude gauge 5 can adopt metal material to make, its structural strength is large, can carry out accurately inductance sensor 1, locate reliably, between altitude gauge 5 and inductance sensor 1, by feed screw nut auxiliary structure, be connected, altitude gauge 5 outer walls are processed with screw thread and form leading screw, the mount pad 4 of inductance sensor 1 is provided with a nut, and described nut axis vertically arranges and is connected in mount pad 4 in the mode that can rotate around himself axis; The lateral surface of nut arranges anti-skidding striped and outside at least partly lateral surface is exposed to, in order to manual drives nut rotation, controls inductance sensor 1 height; Certainly between inductance sensor 1 and altitude gauge 5, also can adopt rack-and-pinion or latch to be connected in altitude gauge 5 realizes and highly can be in harmonious proportion location.
In the present embodiment, also comprise for the inductance signal to inductance sensor 1 process, the computing machine 6 of data recording and mapping analysis, computing machine 6 is connected in the signal output part of inductance sensor 1 by wire 9, by prior art, can realize the inductance signal that inductance sensor 1 is detected and process and along time shaft, inductance value carried out to imaging, not repeat them here; Computing machine 6 comprise LCR equipment so that inductance signal is processed, record, end recycling mapping software to be tested is mapped, to obtain the settling time.
In the present embodiment, described inductance sensor 1 comprises shell 11 and inductive coil 10; Described inductive coil 10 is circumferentially wound around along test tube 2; Described shell 11 is coated on inductive coil 10 outsides in the form of a ring; Shell 11 adopts high permeability material to make; Inductance sensor 1 shell 11 adopts high magnetic conductive material, the magnetic circuit that its induced inside coil 10 produces is limited in shell 11, therefore mark position that can be using the shell of inductance sensor 1 11 tops as known location, thereby maximal value place also appear at stratification line by the moment on inductance sensor 1 top, be convenient to obtain inductance sensor 1 and be down to accurate distance and the sedimentation stratification line of liquid level the precise time that inductance sensor 1 place experiences.
In the present embodiment, described shell 11 diameter of bores and ferrule sleeve 8 diameter of bores equate with test tube 2 external diameters, can guarantee the positioning precision of test tube 2, inductance sensor 1 fits tightly with test tube 2 simultaneously, magnetic flow liquid 3 is carried out to non-contact testing, directly obtain inductance signal, do not need extra acquisition sensor as teslameter etc., and only need faint electric current can obtain good inductance signal, can ignore the impact of inductance sensor 1 on magnetic flow liquid 3 settling characters own, compact conformation, easy and simple to handle, cost is low.
In the present embodiment, described inductive coil 10 numbers of turn are 300～600 circles, are especially 400～500 circles, can guarantee higher sensitivity, described shell 11 axial lengths are 5～30mm, especially be 10～25mm, there is less longitudinal height, because inductance sensor has certain longitudinal height, so measured real total inductance for the magnetic flow liquid in its whole inner diameter volume comprising of inductance of inductance sensor, therefore, when sedimentation separatrix appears at sensor top and starts to move down, total content of the magnetic flow liquid comprising in sensor reduces, obviously institute's inductance value of surveying decline, but, if sensor is longitudinally highly little, the proportion that the amount reducing accounts for the total content of sensor is larger, the trend changing is more obvious, the protruding curve in Fig. 2 can be more obvious, be conducive to find accurate settling time point.
The assay method of the magnetic flow liquid 3 subsidence rate analyzers of the present embodiment, comprises the following steps:
A pours the magnetic flow liquid having stirred 3 samples of demarcating volume in test tube 2;
B, puts into inductance sensor 1 also until ferrule sleeve 8 is fixing by test tube 2;
C, moves down inductance sensor 1 apart from s along altitude gauge 5 as initial position with the equal place of the interior liquid level of test tube 2, and the inductance signal of simultaneously opening 6 pairs of inductance sensors 1 of computing machine is processed, data recording and mapping analysis;
D, obtains according to inductance signal and time chart the time t that sedimentation stratification line is down to inductance sensor 1 place experience, and calculating thus subsidence rate is s/t.
In test tube 2, pour the magnetic flow liquid having stirred 3 samples of demarcating volume into, the exact position of the liquid level of known magnetic flow liquid 3 in test tube 2 thus, and using this position as the initial position on inductance sensor 1 shell 11 tops, again test tube 2 is put into inductance sensor 1 also until ferrule sleeve 8, subsequently altitude gauge 5 is moved down to suitable displacement together with inductance sensor 1 on altitude gauge 5 screw thread guide rails, record this shift value, open computing machine 6, start to detect and record inductance value data.Referring to Fig. 2, can utilize computing machine 6 by record data and time relationship mapping, can be by asking extreme value to obtain maximum induction value constantly to inductance signal function L (t) to time t, be sedimentation stratification line by the stratification line time on inductance sensor 1 top, utilize thus known displacement s and this Time Calculation to go out subsidence rate, compared with prior art, it is simple in structure, compact, easy and simple to handle, measure precision high, equipment cost is low.
In the present embodiment, change s value repeating step c and d calculated settlement speed average value, further improve and measure precision.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. a magnetorheological fluid sedimentation rate determination instrument, is characterized in that: comprise inductance sensor and for holding the test tube of magnetic flow liquid; Described test tube is vertically placed; Described inductance sensor is located at test tube outside and highly adjustable.
2. magnetorheological fluid sedimentation rate determination instrument according to claim 1, is characterized in that: also comprise base; Described base is provided with for ferrule sleeve fixing and support test tube.
3. magnetorheological fluid sedimentation rate determination instrument according to claim 2, is characterized in that: also comprise shaft-like altitude gauge, described altitude gauge vertically arranges and is fixed on base.
4. magnetorheological fluid sedimentation rate determination instrument according to claim 3, is characterized in that: described inductance sensor is set in test tube outside and is installed on altitude gauge in adjustable for height mode.
5. magnetorheological fluid sedimentation rate determination instrument according to claim 1, is characterized in that: also comprise for the inductance signal to inductance sensor process, the computing machine of data recording and mapping analysis.
6. according to the magnetorheological fluid sedimentation rate determination instrument described in the arbitrary claim of 2-4, it is characterized in that: described inductance sensor comprises shell and inductive coil; Described inductive coil is circumferentially wound around along test tube; Described shell is coated on inductive coil outside in the form of a ring; Shell adopts high permeability material to make.
7. magnetorheological fluid sedimentation rate determination instrument according to claim 6, is characterized in that: described shell diameter of bore and ferrule sleeve diameter of bore equate with test tube external diameter.
8. magnetorheological fluid sedimentation rate determination instrument according to claim 6, is characterized in that: described number of inductive coil turns is 300～600 circles; Described shell axial length is 5～30mm.
9. an assay method for magnetorheological fluid sedimentation rate determination instrument, is characterized in that: comprise the following steps:
A, pours the magnetic flow liquid sample having stirred of demarcating volume in vitro into;
B, puts into inductance sensor also until ferrule sleeve is fixed by test tube;
C, moves down inductance sensor apart from s as initial position along altitude gauge with the equal place of liquid level in vitro, open simultaneously computing machine to the inductance signal of inductance sensor process, data recording and mapping analysis;
D, obtains according to inductance signal and time chart the time t that sedimentation stratification line is down to inductance sensor place experience, and calculating thus subsidence rate is s/t.
10. the assay method of magnetorheological fluid sedimentation rate determination instrument according to claim 9, is characterized in that: change s value repeating step c and d calculated settlement speed average value.
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Cited By (10)
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| CN106596660A (en) * | 2016-12-22 | 2017-04-26 | 重庆大学 | Test method for magnetorheological-fluid floating property and tester thereof |
| CN106872320A (en) * | 2017-03-22 | 2017-06-20 | 太原理工大学 | The apparatus and method of aggregate sedimentation in a kind of test fill paste |
| CN107421860A (en) * | 2017-08-08 | 2017-12-01 | 浙江大学 | One-dimensional vertical barged-in fill granule density test device and method of testing |
| CN107807142A (en) * | 2017-10-26 | 2018-03-16 | 北京航空航天大学 | A kind of measuring system and measuring method of solid impurities concentration |
| CN108385740A (en) * | 2018-03-11 | 2018-08-10 | 韩少鹏 | foundation sedimentation monitoring system |
| CN109374485A (en) * | 2018-10-11 | 2019-02-22 | 浙江师范大学 | A kind of magnetorheological fluid sedimentation speed detector, method and system |
| CN109780121A (en) * | 2019-02-13 | 2019-05-21 | 重庆大学 | Anti-settling MR damper based on on-line monitoring |
| CN110145564A (en) * | 2019-01-22 | 2019-08-20 | 天津大学 | A kind of controllable flexible shock-absorbing device for thin-walled parts machining |
| CN114486650A (en) * | 2021-12-24 | 2022-05-13 | 鞍钢集团矿业有限公司 | Device and method for detecting sedimentation velocity of magnetite particles under composite force field |
| CN115127966A (en) * | 2022-08-26 | 2022-09-30 | 北京博汇特环保科技股份有限公司 | Measuring device and measuring method for sludge sedimentation performance |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596660A (en) * | 2016-12-22 | 2017-04-26 | 重庆大学 | Test method for magnetorheological-fluid floating property and tester thereof |
| CN106872320A (en) * | 2017-03-22 | 2017-06-20 | 太原理工大学 | The apparatus and method of aggregate sedimentation in a kind of test fill paste |
| CN107421860A (en) * | 2017-08-08 | 2017-12-01 | 浙江大学 | One-dimensional vertical barged-in fill granule density test device and method of testing |
| CN107807142A (en) * | 2017-10-26 | 2018-03-16 | 北京航空航天大学 | A kind of measuring system and measuring method of solid impurities concentration |
| CN108385740A (en) * | 2018-03-11 | 2018-08-10 | 韩少鹏 | foundation sedimentation monitoring system |
| CN109374485A (en) * | 2018-10-11 | 2019-02-22 | 浙江师范大学 | A kind of magnetorheological fluid sedimentation speed detector, method and system |
| CN109374485B (en) * | 2018-10-11 | 2021-01-26 | 浙江师范大学 | Magnetorheological fluid settling velocity detection device, method and system |
| CN110145564B (en) * | 2019-01-22 | 2023-12-29 | 天津大学 | Controllable flexible vibration damper for cutting thin-wall part |
| CN110145564A (en) * | 2019-01-22 | 2019-08-20 | 天津大学 | A kind of controllable flexible shock-absorbing device for thin-walled parts machining |
| CN109780121A (en) * | 2019-02-13 | 2019-05-21 | 重庆大学 | Anti-settling MR damper based on on-line monitoring |
| CN114486650A (en) * | 2021-12-24 | 2022-05-13 | 鞍钢集团矿业有限公司 | Device and method for detecting sedimentation velocity of magnetite particles under composite force field |
| CN115127966A (en) * | 2022-08-26 | 2022-09-30 | 北京博汇特环保科技股份有限公司 | Measuring device and measuring method for sludge sedimentation performance |
| CN115127966B (en) * | 2022-08-26 | 2022-12-13 | 北京博汇特环保科技股份有限公司 | Measuring device and measuring method for sludge sedimentation performance |
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Application publication date: 20140917 |