CN101382177A - Two-channel magnetorheological damper with passage gating capability - Google Patents
Two-channel magnetorheological damper with passage gating capability Download PDFInfo
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- CN101382177A CN101382177A CNA2008102328744A CN200810232874A CN101382177A CN 101382177 A CN101382177 A CN 101382177A CN A2008102328744 A CNA2008102328744 A CN A2008102328744A CN 200810232874 A CN200810232874 A CN 200810232874A CN 101382177 A CN101382177 A CN 101382177A
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- piston
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Abstract
The invention relates to a dual-passage magnetorheological damper with passage gating capability; a working cylinder, a piston body, an excitation component, an magnetic shield sleeve, a piston rod, a guiding ring, a sealing component, a compensating device and the like are jointly compose the whole dual-passage magnetorheological damper; the structural design ensures the realization of passage gating capability of the dual-passage magnetorheological damper and greatly simplifies the design method of the existing magnetorheological damper; the clearance between the piston component and the excitation component forms an internal passage while the clearance between the piston component and the working cylinder forms an external passage; when external excitation current is not applied, the magnetorheological fluid mainly passes through the internal passage and then the damping force is minimum; when the excitation current achieves saturation, the magnetorheological fluid mainly passes through the external passage and then the damping force is maximum. By the passage gating effect of the flowing of the magnetorheological fluid, the stepless change between the minimum value and the maximum value of the damping force is realized.
Description
Technical field:
The invention belongs to Structure with Intelligent Structure System and structural vibration control technical field, can and use specific to machineries such as vehicle, engineering machinery, weapon platform, the control of civil structure system vibration, be specifically related to a kind of the have two-channel magnetorheological damper of passage gating capability and relevant design method thereof.
Background technique:
In the structural vibration control technical field, people adopt elastic element and damping member to realize that vibration control, damping member wherein adopt oil damper usually usually, utilize fluid to produce the damping force that adapts with external environment condition by the long-pending flow channel of variable cross section.This method need adopt valve arrangement control flow channel by area, causes structural reliability not high, is easy to produce fault; On the other hand, owing to need be adapted to complicated external environment condition by control structure, the damping characteristic of conventional oil fluid shock absorber can't be followed external environment condition and be carried out the self adaption adjusting, cause controlled structure objects to be difficult to the performance that reaches optimum, it is a kind of passive vibration control technology, therefore adopt the half active vibration control that realizes controlled device based on the controllable damping device of magnetic rheological fluid intelligent material, can in complex environment, reach good vibration control effect, the reliability height, good stability, need not to consume a large amount of energy simultaneously, power consumption is extremely low, can advantage such as use in the energy obtains the wild environment of difficulty.
Existing disclosed MR damper structure is had nothing in common with each other, can realize the Semi-active Vibration Control function of controlled device, but they generally have complex structure, design loaded down with trivial details characteristics, especially in design process, need to consider the shear yielding characteristic of magnetic flow liquid material, make MR damper be difficult to accomplish seriation and generalization, limited its application space greatly.For MR damper is more widely used, need make the MR damper design break away from concrete application, to realize seriation, generalization, this has nothing to do with regard to the design performance of inevitable requirement MR damper and concrete magnetic flow liquid material characteristics profile.
Summary of the invention:
The present invention is directed to existing MR damper design and need consider the deficiency of magnetic flow liquid material behavior, pass through special structural design, make to add controllable magnetic field the control of magnetic flow liquid apparent viscosity is changed into control to the MR damper valid circulation area, thereby realize breaking away from MR damper seriation, the General design of magnetic flow liquid material properties.
Two-channel magnetorheological damper with passage gating capability designs inside and outside passage and by guaranteeing inside and outside interchannel size relationship, the MR damper externally-applied magnetic field is changed into the variation of effective discharge area to the change of magnetic flow liquid yield characteristic, externally-applied magnetic field is strong more, the apparent viscosity of internal channel magnetic flow liquid is big more, effectively (equivalent) flow area is then more little, when magnetic field reached capacity, effective (equivalent) flow area of internal channel leveled off to zero.Like this, by the control of externally-applied magnetic field to effective flow area, make MR damper design break away from concrete magnetic flow liquid yield characteristic, the magnetic flow liquid that only requires to adopt reaches the highest yield stress that needs and gets final product.
Technological scheme of the present invention is as follows:
Two-channel magnetorheological damper with passage gating capability, comprise clutch release slave cylinder, piston rod, piston assembly, black box and compensation device, wherein, piston assembly is made up of piston only, excitation component, magnetic shield tube, excitation component is installed in piston only inside, and the magnetic shield tube is fitted on the piston only by interference fit; Piston rod links to each other with piston assembly, inserts in the clutch release slave cylinder, and axial motion in clutch release slave cylinder is full of magnetic flow liquid in the clutch release slave cylinder, and described clutch release slave cylinder is separated into two chambeies up and down by piston assembly, seals by seal arrangement between piston rod and clutch release slave cylinder mouth; It is characterized by:
Constitute the mobile external chennel of magnetic flow liquid between piston assembly and clutch release slave cylinder, gap between piston assembly and excitation component constitutes the mobile internal channel of magnetic flow liquid, magnetic flow liquid enters inside and outside passage by the hole on the piston only, the damping effect that described damper produces when utilizing the inside and outside passage that magnetic flow liquid forms by piston assembly realizes the controlled structure in outside is produced damping force.
Two-channel magnetorheological damper with passage gating capability includes clutch release slave cylinder, piston rod, piston external member, compensation device and seal arrangement, be full of magnetic flow liquid in the clutch release slave cylinder, and be divided into up and down two chambeies by the piston external member, compensator is used to compensate the clutch release slave cylinder volume-variation of moving and producing owing to piston rod in clutch release slave cylinder, and the end of clutch release slave cylinder is sealed by seal arrangement.The piston external member is made of piston only, magnetic shield tube, excitation component, guide ring, the magnetic shield tube is fitted in and forms piston assembly on the piston only, constitute the mobile external chennel of magnetic flow liquid between piston assembly and clutch release slave cylinder, and the gap between excitation component constitutes the mobile internal channel of magnetic flow liquid, and guarantee internal channel gap (or flow area) 2 times greater than external chennel gap (or flow area) by structural design, to guarantee to realize the control effect of passage gating to damping force.
The present invention has following advantage:
1, the design process of MR damper is simplified greatly.Existing MR damper is because the restriction of single channel design, obtain the minimum damping force of damper at the null field state, but the maximum damping force that damper can reach, and add damping force characteristic curve under the field current effect in difference, not only the magnetic field state that can reach with excitation structure is relevant, more closely related with the shear yield stress characteristic of magnetic flow liquid, damper designs can not break away from the material behavior of magnetic flow liquid.The present invention is based on the structural design of novelty, with the control of controllable magnetic field to the magnetic flow liquid apparent viscosity, change the control of the equivalent circulation area of MR damper into, thereby make damper designs can break away from the magnetic flow liquid material properties, only require excitation structure to reach enough strong magnetic field and magnetic flow liquid and have enough big high shearing yield stress.
2, because the design process of magnetic rheological liquid damper can break away from the magnetic flow liquid material properties, novel design method with magnetic rheological liquid damper of passage gating capability helps realizing the seriation and the generalization of MR damper, thereby the design that makes MR damper breaks away from concrete application, realize seriation and generalization, help application and development, the performance boost that brings vibration control related facility equipment based on half ACTIVE CONTROL system of magnetic rheological fluid intelligent material.
3, existing relatively single channel design MR damper, because the existence of normal open external chennel, the passage that novel MR damper will effectively overcome under the at a high speed big field current state blocks, and the damping force hysteresis problem of bringing thus, improve the dynamics of MR damper, can avoid using high-pressure aerated, double-barrel structure design etc. to be used to overcome the measure that damping force lags behind.
4, simplify the MR damper structure.Be different from other MR damper structures, this two-channel magnetorheological damper piston and excitation part are except that stuffing box packing, coil winding and standard piece, 4 individual part are only arranged, be respectively sealing cover 12, field core 16, piston only 17, magnetic shield tube 18, have simple in structure, the advantage of reliable operation.Piston only 17 bottoms are guide structure, need not to adopt independent guider, further simplified structure, polytetrafluorethyleguide guide ring 22 is in good guidance, have antifriction, lubrication, adopt the epoxy resin filler that lead-in wire and winding position are sealed simple and reliable process, good sealing effect, concrete structure please refer to accompanying drawing 2.
Description of drawings:
Accompanying drawing 1 is the two-channel magnetorheological damper overall construction drawing that the present invention has passage gating capability;
Accompanying drawing 2 is two-channel magnetorheological damper piston, excitation component and package structure figure that the present invention has passage gating capability, relates to key structure of the present invention, comprises inside and outside Twin channel, piston guide device structure and lead-in wire mode etc.
Embodiment:
According to Figure of description technological scheme of the present invention is described in further detail below.
Two-channel magnetorheological damper general structure with passage gating capability as shown in Figure 1.It mainly contains lead-in wire 1, oil sealing 2, guide holder 3, guide holder supporting 4, clutch release slave cylinder 5, piston rod 6, magnetic flow liquid 7, piston assembly 8, compensator 9, guide ring 10, clutch release slave cylinder base 11 compositions.Wherein oil sealing 2, guide holder 3, the guide holder supporting 4 common seal arrangements that constitute MR damper, they finish the guide function of damper again with piston assembly 8, prevent from that piston rod and piston assembly from producing to wave and rock when to-and-fro motion; Compensator 9 is used to hold because piston rod passes in and out the volume that the magnetic flow liquid of clutch release slave cylinder formation changes, and its adopts hydraulic tube piece to communicate with the clutch release slave cylinder cavity of resorption, can adopt common hydraulic accumulator, not only makes design simplification, also increases the reliability of damper work.
The concrete structure of above-mentioned piston assembly 8 as shown in Figure 2, it mainly is made of clutch release slave cylinder 5, piston rod 6, sealing cover 12, sealing cover O shape circle 13, epoxy sealing filler 14, field coil 15, field core 16, piston only 17, magnetic shield tube 18, piston base O shape circle 19, elastic washer 20, locking nut 21, guide ring 22.Elastic washer 20 and locking nut 21 utilize piston rod end be threaded piston assembly and piston rod 6, constitute the integral body of associated movement; Have radially circular hole B of 4 axial waist drum type hole A and 8 near the piston base, they are respectively the paths that magnetic flow liquid enters inside and outside passage; Have aperture C on field core 16, as the extraction channel of lead-in wire 1 from field coil 15, lead-in wire is drawn the damper outside in the welding of tapered collar epoxy resins filler position and by the piston rod endoporus; In order to guarantee the sealing of excitation component, prevent that magnetic flow liquid from passing through the piston rod endoporus and leaking, adopt epoxy sealing filler 14, sealing cover O shape circle 13, piston base O shape circle 19 to seal; The bottom of piston only 17 is a guide structure, and polytetrafluorethyleguide guide ring 22 is embedded in the guider annular groove, play the guiding role jointly with guide holder 3 among Fig. 1; Form the loop between the magnetic flow liquid of magnetic field in field core 16, piston only 17 and internal channel that field coil 15 produces, non-magnet materials such as magnetic shield tube 18 usefulness aluminum alloys are made, be fitted on the piston only 17, be used to weaken the influence of access road, magnetic field, The results shows, the magnetic shield tube reaches certain thickness, the piston only magnetic resistance hour, it is very little that magnetic field sees through the influence that causes magnetic shield tube access road; Field coil 15 in said structure is made up of two groups of coil winding, when as installed, must guarantee that their magnetic field polarity under correct energising situation are opposed, i.e. the homopolar end directed in opposite of two coil winding.
According to the viscous fluid kinetic theory of Clearance Flow between donut, when inside and outside annulus is all motionless the flow representation as the formula (1), internal channel is in internal piston, does not have relative movement between wall, it flows and then to belong to this situation.Wherein Δ p is that the piston pressure at two ends is poor, and it is the sign of damping force size, d
nBe internal channel diameter, h
nBe the internal channel gap width, μ is the kinetic viscosity by medium, and l is the length of piston, and q is the flow between the clutch release slave cylinder upper and lower cavity, and it equals the upper and lower cavity volume-variation that the piston axial motion produces.As seen, the cube of the damping force of MR damper and gap width is inversely proportional to.
When a ring moved axially with certain speed another ring, the flow equation formula as the formula (2) at this moment.Because the relative movement between piston and the cylinder barrel, the runner of external chennel then belongs to this situation, and U is the speed of related movement of piston in the formula, d
wBe external chennel diameter, h
wBe the external chennel gap width.Its expression (1) and the stack of piston shaft to the mobile flow that brings, for the occasion of damper, because the piston motion direction is opposite with flow direction all the time, formula can only be got negative sign in (2), and this moment, flow was less than all motionless occasion of inside and outside ring.
Can be expressed as with following formula (2):
For common damper structure design, following relation is arranged: Δ p〉1Mpa, h
w＜1mm, μ ≈ 0.1Pas, l＜0.1m, U＜1m/s, as seen:
Like this, the hydrokinetics difference when we can ignore piston relative movement is arranged thinks that the inside and outside passage of MR damper produces damping force and all is inversely proportional to the cube of gap width.As long as when design, make internal channel gap h
n(or flow area) is greater than external chennel gap h
w(or flow area) 2 times, because flow q is decided by the characteristics of motion of piston, the damping force f that produce during inside and outside passage individualism this moment
n, f
wFollowing relation: f will be arranged
w8f
nWhen not applying externally-applied magnetic field, magnetic flow liquid is simultaneously by inside and outside passage, but because the external chennel resistance is big, and is very little by flow, this moment damping force near but be slightly less than f
nWhen applying saturation magnetic field, the internal channel magnetic flow liquid is owing to magnetic rheology effect solidifies, this moment magnetic flow liquid mainly by there not being the external chennel of magnetic field control, and damping force near and be slightly less than f
wAs seen,, change the control of the equivalent circulation area of MR damper into, realize passage gating capability by with the control of controllable magnetic field to the magnetic flow liquid apparent viscosity, can be similar to make MR damper damping force at f
nTo f
wBetween change.According to the gap width of the inside and outside passage of fluid dynamic theory design damper, and realize excitation structure make magnetic field from null field to saturated State Control, the two-channel magnetorheological damper with passage gating capability can realize that damping force is from f
nTo f
wStepless variation.
The embodiment who more than provides is in order to the practical application of explanation the present invention and it, and therefore makes those skilled in the art can make and use the present invention.But this only is a preferred embodiment, be not that the present invention is done any pro forma restriction, any one professional and technical personnel is in the scope that does not depart from technical solution of the present invention, and above technology of foundation and method do certain modification and the equivalent embodiment who is considered as equivalent variations is worked as in change.
Claims (8)
1, the two-channel magnetorheological damper that has passage gating capability, comprise clutch release slave cylinder, piston rod, piston assembly, black box, wherein, piston assembly is made up of piston only, excitation component, magnetic shield tube, excitation component is installed in piston only inside, and the magnetic shield tube is fitted on the piston only by interference fit; Piston rod links to each other with piston assembly, inserts in the clutch release slave cylinder, and axial motion in clutch release slave cylinder; Be full of magnetic flow liquid in the described clutch release slave cylinder, clutch release slave cylinder is separated into two chambeies up and down by piston assembly, seals by seal arrangement between piston rod and clutch release slave cylinder mouth; It is characterized by:
The gap constitutes the mobile external chennel of magnetic flow liquid between piston assembly and clutch release slave cylinder, piston only in the piston assembly and the gap between excitation component constitute the mobile internal channel of magnetic flow liquid, magnetic flow liquid enters inside and outside passage by the hole on the piston only, the damping effect that described Twin channel magnetic current damper produces when utilizing the inside and outside passage that magnetic flow liquid forms by piston assembly realizes the controlled structure in outside is produced damping force.
2, two-channel magnetorheological damper according to claim 1, it is characterized in that: have circular hole or dolioform hole that magnetic flow liquid enters inside and outside passage on the described piston only, inside and outside passage constitutes the flow channel of magnetic flow liquid between the clutch release slave cylinder upper and lower cavity together.
3, two-channel magnetorheological damper according to claim 1, it is characterized in that: the bottom of piston only is a guide structure, teflon material guide ring is directly installed on the guide structure of piston only, and form the sliding movement pair between clutch release slave cylinder, reach the purpose of steady motion direction and antifriction; The end that piston rod is positioned at the clutch release slave cylinder mouth is provided with the guide holder structure.
4, two-channel magnetorheological damper according to claim 1 is characterized in that: piston rod passes the intermediate hole of excitation component, realizes being threaded between the screw thread by the piston rod end and piston only, installs elastic washer additional between nut and piston only.
5, two-channel magnetorheological damper according to claim 1, it is characterized in that: after the field coil coiling of excitation component is finished, seal at coil outer surface coating epoxy resin, and after sclerosis, epoxy coating is machined to the excitation component external diameter and flushes, the excitation component lead-in wire is drawn by the aperture that has in the piston rod, adopt the epoxy resin filler to seal at the lead bonding position, adopt O shape circle to seal at the junction plane place at excitation component two ends simultaneously.
6, two-channel magnetorheological damper according to claim 1 is characterized in that: the ratio of internal channel gap width and external chennel gap width is greater than 2, or make the internal channel gap by area and the external chennel gap ratio by area greater than 2.
7, two-channel magnetorheological damper according to claim 1, it is characterized in that: this MR damper also comprises compensator, adopt hydraulic tube piece to communicate with the clutch release slave cylinder cavity of resorption, be used to hold because piston rod passes in and out the volume that the magnetic flow liquid of clutch release slave cylinder formation changes, increase the reliability of damper work.
8, two-channel magnetorheological damper according to claim 7 is characterized in that: described compensator adopts hydraulic accumulator.
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| CNA2008102328744A CN101382177A (en) | 2008-10-15 | 2008-10-15 | Two-channel magnetorheological damper with passage gating capability |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793302A (en) * | 2010-03-18 | 2010-08-04 | 河海大学 | Three-cylinder type large-capacity magneto-rheological damper |
| CN102588499A (en) * | 2012-03-01 | 2012-07-18 | 谢宁 | Ultralong-stroke magnetorheological damper |
| CN103396655A (en) * | 2013-08-14 | 2013-11-20 | 株洲时代新材料科技股份有限公司 | Potting adhesive for magnetorheological dampers, and preparation and application methods thereof |
| CN105065554A (en) * | 2015-07-20 | 2015-11-18 | 常州大学 | Multi-stage diffractive active single-control variable-damping magnetorheological damper with single rod |
| CN105508494A (en) * | 2015-12-30 | 2016-04-20 | 中国海洋大学 | Anti-impact magnetorheological damper |
| CN106402256A (en) * | 2016-11-29 | 2017-02-15 | 哈尔滨工业大学 | Multichannel magnetorheological damper with built-in parallel coils |
| CN108180250A (en) * | 2018-01-22 | 2018-06-19 | 华东交通大学 | A kind of built-in magnet valve improves the two-wire ring MR damper of damping capacity |
| CN109083965A (en) * | 2018-09-21 | 2018-12-25 | 株洲时代新材料科技股份有限公司 | Automobile suspension system isolation mounting and its design method |
| CN109826903A (en) * | 2019-02-13 | 2019-05-31 | 杨泽达 | Set channel MR damper in a kind of bottom of band sedimentation Active dispersion devices |
| CN110736682A (en) * | 2019-10-23 | 2020-01-31 | 合肥工业大学 | Magnetorheological suspensions flow mode rheology attribute testing arrangement |
| CN114992268A (en) * | 2021-03-02 | 2022-09-02 | 本田技研工业株式会社 | Suspension device |
| CN115440119A (en) * | 2022-11-09 | 2022-12-06 | 德阳市人民医院 | Model and method for dynamically demonstrating cerebral infarction pathology |
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2008
- 2008-10-15 CN CNA2008102328744A patent/CN101382177A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793302A (en) * | 2010-03-18 | 2010-08-04 | 河海大学 | Three-cylinder type large-capacity magneto-rheological damper |
| CN102588499A (en) * | 2012-03-01 | 2012-07-18 | 谢宁 | Ultralong-stroke magnetorheological damper |
| CN103396655A (en) * | 2013-08-14 | 2013-11-20 | 株洲时代新材料科技股份有限公司 | Potting adhesive for magnetorheological dampers, and preparation and application methods thereof |
| CN105065554A (en) * | 2015-07-20 | 2015-11-18 | 常州大学 | Multi-stage diffractive active single-control variable-damping magnetorheological damper with single rod |
| CN105508494A (en) * | 2015-12-30 | 2016-04-20 | 中国海洋大学 | Anti-impact magnetorheological damper |
| CN106402256A (en) * | 2016-11-29 | 2017-02-15 | 哈尔滨工业大学 | Multichannel magnetorheological damper with built-in parallel coils |
| CN108180250A (en) * | 2018-01-22 | 2018-06-19 | 华东交通大学 | A kind of built-in magnet valve improves the two-wire ring MR damper of damping capacity |
| CN109083965A (en) * | 2018-09-21 | 2018-12-25 | 株洲时代新材料科技股份有限公司 | Automobile suspension system isolation mounting and its design method |
| CN109826903A (en) * | 2019-02-13 | 2019-05-31 | 杨泽达 | Set channel MR damper in a kind of bottom of band sedimentation Active dispersion devices |
| CN110736682A (en) * | 2019-10-23 | 2020-01-31 | 合肥工业大学 | Magnetorheological suspensions flow mode rheology attribute testing arrangement |
| CN110736682B (en) * | 2019-10-23 | 2022-01-11 | 合肥工业大学 | Magnetorheological suspensions flow mode rheology attribute testing arrangement |
| CN114992268A (en) * | 2021-03-02 | 2022-09-02 | 本田技研工业株式会社 | Suspension device |
| US11926186B2 (en) | 2021-03-02 | 2024-03-12 | Honda Motor Co., Ltd. | Suspension device |
| CN115440119A (en) * | 2022-11-09 | 2022-12-06 | 德阳市人民医院 | Model and method for dynamically demonstrating cerebral infarction pathology |
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