CN102817955A - Method for modifying giant electrorheological fluid damper polar plate - Google Patents
Method for modifying giant electrorheological fluid damper polar plate Download PDFInfo
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- CN102817955A CN102817955A CN2012101912477A CN201210191247A CN102817955A CN 102817955 A CN102817955 A CN 102817955A CN 2012101912477 A CN2012101912477 A CN 2012101912477A CN 201210191247 A CN201210191247 A CN 201210191247A CN 102817955 A CN102817955 A CN 102817955A
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Abstract
A method for modifying a giant electrorheological fluid damper polar plate is characterized in that micro-nano and roughing process is performed to the surface of the giant electrorheological fluid damper polar plate. Compared with the prior art, micro-nano modification process is performed to the surface of the giant electrorheological fluid damper polar plate, friction coefficient between the giant electrorheological fluid and the polar plate is increased to obtain the giant electrorheological fluid polar plate with high damping force, and damping force of the giant electrorheological fluid dampers can be increased greatly.
Description
Technical field
The present invention relates to a kind of giant electro-rheological body damper pole plate, relate in particular to the modification processing method of this pole plate.
Background technique
Electro rheological fluids (Electrorheological Fluid) is to be scattered in a kind of suspension that forms in the base fluid by polarizable dielectric particles; Its viscosity, shear strength, rheological behaviour etc. can be with reversible, the controlled transformations of variation moment generation of electric field under effect of electric field; When loading electric field; Performance is instantaneous changes for its viscosity, shear strength etc., becomes different viscosity fluids, difficult viscoelastic body or the immobilising high viscosity solid of flowing by runny low viscosity fluid.Under electric field action; The positive and negative charge of particulate separates, and positive charge is shifted to particulate near a side of negative electrode, and negative charge is then shifted to particulate near a side of positive charge; Particle alignment becomes chain structure; Extend to another electrode from an electrode, and at the gap location that does not form particle chains, attract each other between the particulate and constitute fine little shape and arrange.When chain received shear action, particulate was drawn back, and owing to electric charge is still attracting each other, thereby produced shearing stress.Fig. 1 is the electro rheological fluids fundamental diagram.Extra electric field is high more, and the attraction force between this electric charge is strong more, so shearing stress is big more.After electric field removes; It can return to its original state---fluid state again in the millisecond time or in more hour; And institute's energy requirement is very little, can be from self top layer or outsidely obtain change information about environmental conditions, and judge, handle and make response; Change self structure and damping function in good time and it is coordinated with the external world well, have the self-adapting intelligent regulatory function.This reversible, controlled continuous variation characteristic, and good automatically controlled behavior are with a wide range of applications in fields such as defence equipment, the traffic tool, hydraulic equipment, machine building industry, sensor technologies.
The discovery of electro rheological fluids is worth to the huge applications that people show electro rheological fluids; Application facet at electro rheological fluids; Countries in the world particularly developed country are all successively dropped into huge fund and have been developed multiple electro rheological fluids device; Some Hesperian national defence and industrial department drop into hundreds of millions of funds, carry out the research of er material and damping device thereof.U.S.'s " federal science engineering and technological coordination committee " classifies the research of electro rheological fluids as a key areas; Point out in U.S. Department of Energy's " about Final Report of electro rheological fluids research demand appraisal "; " electro rheological fluids is potential become electric--the highest a kind of of energy efficiency in the conversion; and reasonable price, compact structure, quick, the durable in use and variable dynamic range of response, these characteristics are that any other is electric--conversion method all can't be accomplished ".
Just begun to adopt the research of the adjustable damping suspension shock-absorber of electro rheological fluids abroad at the initial stage eighties.The active electromagnetic inductive suspension system has been applied in the Cadillac SRX4.6L series.The Lord company of the U.S. has multiple electrorheological products such as engine mounting, vehicle suspension and introduces to the market; Half active electro rheological fluids automobile suspension system of Lubrizol company development has carried out road test in Ford Motor Company, has greatly improved the stationarity of automobile, has obtained good effect; Companies such as Naval Research Lab and Army materials Lab, Ford and General Mators also are being devoted to the research of electro-rheological technology." brave horse " automobile adopts electromagnetic suspension system; The self adaption suspension arrangement can make the speed of a motor vehicle improve 1～2 times; Its cross-country speed improves 2 times, and the stability of platform improves 5～10 times, has reduced vibrations; The vertical, horizontal swing reduces 6～8 times, and Toyota, Nissan and the Onoda company of Japan have all dropped into the application study that a large amount of manpower and financial resources are carried out electrorheological; Britain has seven tame influential companies to set up electro-rheological technology research center-Xin Jiadi, carries out the development of electro-rheological technology, and the two-way shock absorber of AFS company can be realized the damping force of 4000N under the electric field strength of 3KV/mm; The Bayer company of Germany has developed a kind of electrorheological break simple in structure.
At the initial stage, the shear strength of electro rheological fluids is lower, has only 10kPa, and after 2003, people have brought up to 100kPa with the intensity of electro rheological fluids, for distinguishing with original electro rheological fluids, just is referred to as giant electro-rheological body (Giantelectrorheological Fluid).
At present, people are placed on the research of electro rheological fluids material and the research of static damping device with main energy and research emphasis.Conventional damper pole plate is exactly that on-load voltage after the material process processing of conduction is got final product.The document of this type can application reference do
Although electro rheological fluids has huge application potential in theory, practical application is few.Its main cause is that present nearly all electro rheological fluids all can't satisfy the application demand of high comprehensive mechanical property, good temperature and suspension stability etc. simultaneously.More lack to the electro rheological fluids characteristic research of specific demands such as damping device and device architecture design thereof and according to material, structure, device, the control integrated design of device property demand.The electro rheological fluids pole plate is single; Electro rheological fluids some usefulness when work obtains performance; Because electro rheological fluids has produced slippage under external force, slippage takes place and causes the electro rheological fluids damping to descend in meeting between the electro rheological fluids of curing and the pole plate, and the yield strength of electro rheological fluids is obviously reduced; Be difficult to satisfy the actual demand of practical applications; Therefore the operating mode according to the damping equipment design, preferably with may command power backup rheological body material, design current variant damper pole plate, it is a new topic of developing of needing breakthrough badly that optimal design prepares the electro rheological fluids device.
Summary of the invention
Technical problem to be solved by this invention is to the above-mentioned state of the art a kind of preparation method that can give full play to the giant electro-rheological body damper pole plate of electro rheological fluids damping and amortization to be provided.
Friction factor between giant electro-rheological body and the pole plate is less than normal, causes the frictional force between them less than normal.Frictional force when it bears shearing force in other words when the giant electro-rheological body running between pole plate and the giant electro-rheological body just depends on the friction factor of giant electro-rheological body pole plate, and friction factor is bigger, and the frictional force that then produces between the two is just big.When the giant electro-rheological body running owing to giant electro-rheological body and pole plate between friction factor be easy to generate for a short time to slide and cause shearing force low.
By external electric field polarization and the giant electro-rheological body of multiviscosisty, curing produces shearing slip and reduces the mechanical property of damper at pole plate place easily, seriously restrict the raising of giant electro-rheological body damper damping force.In general the shear strength of giant electro-rheological body is more than the 100kPa; That is to say when the giant electro-rheological body in when work; When the frictional force of giant electro-rheological body and electrode surface must be greater than itself shearing force (100kPa), the damping capacity competence exertion of giant electro-rheological body comes out, otherwise; Giant electro-rheological body some usefulness when work obtains performance, because the giant electro-rheological body has produced slippage under external force.Multi-operating mode is satisfied in design, preparation, (0～200Hz) vibration isolation, vibration damping requirement, pole plate micro-nano coarsenization technique are difficult point and the keys that obtains the high-performance damper to wide band.Its damping force of area of contact that increases pole plate and giant electro-rheological body can be geometrical progression to be increased; And slippage takes place and causes giant electro-rheological body damping to descend in meeting between giant electro-rheological body that solidifies and the pole plate, and the yield strength of giant electro-rheological body is obviously reduced.Through the cast setting effect of pole plate to particle chains, increase surface of contact, improve frictional force, improve the interface binding power of pole plate and particle chains, suppress sliding, drift, obtain the high performance structural design parameter.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: a kind of modification processing method of giant electro-rheological body damper pole plate is characterized in that electro rheological fluids damper polar board surface is carried out the micro-nano roughened.
As preferably, described micro-nano roughened can adopt at least a in the processing of receiving of texture groove, the processing of receiving of differential arc oxidation or the processing of receiving of laser ablation.
Further, groove depth is 0.5 ~ 5 micron in the processing of described receiving of texture groove, and groove width is 0.5 ~ 10 micron.Its texture can erect, horizontal, oblique layout, and texture can intersect, and can just intersect, also can skewed crossing, and the gap size between the texture is adjustable.But also exist the groove processing surface roughness high, too little effect is not obvious, too big convection cell rheology rule characteristics such as exert an influence.
Further, described trench cross section can be triangle, trapezoidal, rectangle or circle.
Further, the NaOH aqueous solution that the differential arc oxidation treatment fluid comprises 1.5 ~ 3.5g/L in the processing of described receiving of differential arc oxidation for the Na of 4 ~ 8g/L
2SiO
3The aqueous solution, the current density of loading are 1 ~ 3A/m
2, the polar board surface roughness after the processing is Ra0.5 ~ Ra1.5.
Further, be that the NaCl aqueous solution of 3 ~ 8mol/L of 5 ~ 20m/s is electrolytic solution with flow velocity in the processing of described receiving of laser ablation, laser power density is 1 ~ 5 * 107w/cm2; Two frequency-doubling crystals are KTP; θ=90 °, Φ=23.5 °, the surface roughness of handling the back pole plate is Ra0.5 ~ Ra1.4.
Compared with prior art; The invention has the advantages that: through to electrode pad surface micro-nano modification treatment technology; Improve the friction factor between giant electro-rheological body and pole plate,, significantly improve the damping force of giant electro-rheological body damping device to obtain the electro rheological fluids pole plate of high damping force.
Description of drawings
Fig. 1 is the electro rheological fluids fundamental diagram.
Fig. 2 is the working drawing of different texture micro-nano groove.
Fig. 3 is the micrograph of different texture micro-nano processing pole plate when loading the 4kVmm-1 electric field.
Fig. 4 is differential arc oxidation micro-nano polar board surface figure.
Fig. 5 is the micrograph of differential arc oxidation micro-nano processing pole plate when loading the 4kVmm-1 electric field.
Fig. 6 is laser ablation micro-nano polar board surface figure.
Fig. 7 is the micrograph of laser ablation micro-nano processing pole plate when loading the 4kVmm-1 electric field.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment 1, as shown in Figures 2 and 3, and during general smooth pole plate; Damping force is 100kPa, through being processed into the degree of depth 15 μ m, the circular arc joint arc round angle R5 of radius 25 μ m; The quadrature reticulate pattern; Reticulate pattern is 3mm at interval, and the damping force when process is processed into the aluminum alloy pole plate behind the reticulate pattern is 280kPa, improves 280%.
Embodiment 2, and like Fig. 4 and shown in Figure 5, during general smooth pole plate, damping force is 100kPa, through differential arc oxidation by following process treating: the prescription of differential arc oxidation treatment fluid is: NaOH 2.5g/l, Na
2SiO
36g/l, the current density of loading is 2A/m
2The surface that makes polar board surface produce high abrasion, micro-rough, surface roughness Ra 0.8.Damping force during aluminum alloy pole plate after micro-nano is handled is 245kPa, improves 145%.
Embodiment 3, and like Fig. 6 and shown in Figure 7, during general smooth pole plate, damping force is 100kPa, is that the 5mol/L NaCl solution of 10m/s is electrolytic solution with the flow velocity, and laser power density is 2*10
7W/cm
2, two frequency-doubling crystals are selected KTP for use, θ=90 °, φ=23.5 °.The surface that method through laser ablation makes polar board surface produce high abrasion, micro-rough, surface roughness Ra 1.0.Damping force during through laser ablation micro-nano aluminium alloy treated pole plate is 256kPa, improves 156%.
Claims (6)
1. the modification processing method of a giant electro-rheological body damper pole plate is characterized in that electro rheological fluids damper polar board surface is carried out the micro-nano roughened.
2. modification processing method according to claim 1 is characterized in that at least a in the processing of receiving of texture groove, the processing of receiving of differential arc oxidation or the processing of receiving of laser ablation of described micro-nano roughened.
3. modification processing method according to claim 2 is characterized in that groove depth is 0.5 ~ 5 micron in the processing of described receiving of texture groove, and groove width is 0.5 ~ 10 micron.
4. modification processing method according to claim 3 is characterized in that described trench cross section is triangle, trapezoidal, rectangle or circle.
5. modification processing method according to claim 2, it is characterized in that the NaOH aqueous solution that differential arc oxidation treatment fluid in the processing of described receiving of differential arc oxidation comprises 1.5 ~ 3.5g/L for the Na of 4 ~ 8g/L
2SiO
3The aqueous solution, the current density of loading are 1 ~ 3A/m
2, the polar board surface roughness after the processing is Ra0.5 ~ Ra1.5.
6. modification processing method according to claim 2 is characterized in that in the processing of described receiving of laser ablation with flow velocity being that the NaCl aqueous solution of 3 ~ 8mol/L of 5 ~ 20m/s is electrolytic solution, and laser power density is 1 ~ 5 * 10
7W/cm
2, two frequency-doubling crystals are KTP, θ=90 °, and Φ=23.5 °, the surface roughness of handling the back pole plate is Ra0.5 ~ Ra1.4.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108473906A (en) * | 2015-12-04 | 2018-08-31 | 旭化成株式会社 | ER fluid and electric equipment |
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| DE202008002049U1 (en) * | 2008-02-14 | 2008-08-14 | Diabal, Milan, Dr. | Electroheological resonance damper |
| CN101311326A (en) * | 2007-05-25 | 2008-11-26 | 比亚迪股份有限公司 | Micro arc oxidation electrolytic solution for light metals and micro arc oxidation method |
| CN101556126A (en) * | 2008-04-09 | 2009-10-14 | 中国科学院化学研究所 | Film with high heat conduction efficiency and antifouling capability and preparation method thereof |
| CN101980369A (en) * | 2010-08-30 | 2011-02-23 | 河南安彩高科股份有限公司 | Thin-film solar cell and manufacturing method thereof |
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2012
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070031694A1 (en) * | 2005-08-01 | 2007-02-08 | Permelec Electrode Ltd. | Conductive diamond electrode and process for producing the same |
| CN101089165A (en) * | 2006-06-15 | 2007-12-19 | 中国科学院物理研究所 | Electric rheologic liquid electrode plate for surface modification |
| CN101311326A (en) * | 2007-05-25 | 2008-11-26 | 比亚迪股份有限公司 | Micro arc oxidation electrolytic solution for light metals and micro arc oxidation method |
| DE202008002049U1 (en) * | 2008-02-14 | 2008-08-14 | Diabal, Milan, Dr. | Electroheological resonance damper |
| CN101556126A (en) * | 2008-04-09 | 2009-10-14 | 中国科学院化学研究所 | Film with high heat conduction efficiency and antifouling capability and preparation method thereof |
| CN101980369A (en) * | 2010-08-30 | 2011-02-23 | 河南安彩高科股份有限公司 | Thin-film solar cell and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108473906A (en) * | 2015-12-04 | 2018-08-31 | 旭化成株式会社 | ER fluid and electric equipment |
| CN108473906B (en) * | 2015-12-04 | 2021-12-10 | 旭化成株式会社 | Electrorheological fluid and electrical equipment |
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| CN102817955B (en) | 2014-09-03 |
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