CN204437164U - The MR damper that working clearance is variable - Google Patents
The MR damper that working clearance is variable Download PDFInfo
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- CN204437164U CN204437164U CN201520002500.9U CN201520002500U CN204437164U CN 204437164 U CN204437164 U CN 204437164U CN 201520002500 U CN201520002500 U CN 201520002500U CN 204437164 U CN204437164 U CN 204437164U
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- damper
- piston
- inner core
- damping force
- working clearance
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- 239000007788 liquid Substances 0.000 claims description 16
- 238000013016 damping Methods 0.000 abstract description 54
- 238000010008 shearing Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
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- Fluid-Damping Devices (AREA)
Abstract
The MR damper that working clearance is variable, belongs to the technical field of MR damper.This MR damper is characterized in that: piston cylinder is made up of urceolus (1) and inner core (8); Inner core (8) outer wall is fitted in the internal surface of urceolus (1), and inwall and piston (2) form the working clearance; Inner core (8) has multiple, the height of each inner core (8), and external diameter is identical, and thickness is different, changes the inner core (8) of different-thickness to change the working clearance of MR damper.The utility model, by changing the inner core of different-thickness, changes the working clearance of urceolus and piston space, makes the damping force of damper variable on a large scale, achieve a kind of damper and have exerting oneself of multiple scope, provide cost savings, simple and reliable, there is very large practicability.
Description
Technical field
The utility model relates to the technical field of MR damper, the MR damper that particularly a kind of working clearance is variable.
Background technique
MR damper is nearly ten years a kind of novel structure semi-automatic control devices occurred.Wherein shearing valve type magneto-rheological damper has simple structure, magnetic Circuit Design feature easily.It adopts the structural type of piston and cylinder body usually, and its working principle can be described as: the MR fluid that will extrude piston side in cylinder body when piston and cylinder body produce relative movement, makes it by the opposite side of slit flow to cylinder piston.After the both sides in gap add the magnetic field perpendicular to fluid flow direction, due to " solidification " of magnetic flow liquid in gap, make MR fluid by time the magnetic flow liquid of " solidification " in gap must be made to produce viscoplastic flow, thus produce corresponding damping force.
The damping force Pseudo-static test model being obtained shearing valve type magneto-rheological damper by the bingham model of magnetic flow liquid and fluid mechanics is:
Wherein: τ
ythe shearing stress of magnetic flow liquid, relevant with externally-applied magnetic field; η is the null field viscosity of magnetic flow liquid, sgn is-symbol function, and l is the effective length of piston, and v is the movement velocity of piston, and D is piston diameter, and d is diameter of piston rod; Ap is piston area, and
f
ffor seal friction power, h is damper gap width.
The scope of exerting oneself of shearing valve type magneto-rheological damping can be fixed after structural design completes, and scope of exerting oneself is relevant with the structural parameter of damper.The exert oneself impact of gap size wherein between urceolus and piston on MR damper is very large, and it is too small that gap is got, and MR damper maximum damping force is large, but minimum damping force is also larger; It is excessive that gap is got, and the minimum damping force of MR damper is little, but maximum damping force can reduce.A kind ofly effectively can to address this problem by changing inner core thus changing the MR damper of working clearance, to have great practical value.
Model utility content
The technological scheme that model utility is dealt with problems and adopted: because the working clearance of common MR damper immobilizes, the damping force range causing damping force is fixed, and cannot change in wide range, limits the use of damper.The utility model patent is variable MR damper of a kind of working clearance, by changing the inner core of different-thickness, change the working clearance of urceolus and piston space, make the damping force of damper variable on a large scale, achieve a kind of damper and have exerting oneself of multiple scope, provide cost savings, simple and reliable, there is very large practicability.Model utility also comprises the design method of inner core, rationally determines number and the size of inner core for how according to maximum damping force and Pseudo-static test model, makes to change the damping force variable scope that inner core rationally can expand damper.
The utility model comprises piston cylinder, is installed on the first end cap and second end cap at piston cylinder two ends respectively, to be installed in piston cylinder and to stretch out the piston rod of the first end cap and the second end cap; Piston rod is provided with piston, piston is wound with coil, piston and piston rod are provided with wire guide, the wire of coil is drawn from wire guide; Filling magnetic flow liquid in piston cylinder; First end cap or the second end cap are respectively arranged with seal ring, and the first end cap is provided with the liquid-leaking nozzle with leakage screw closure;
Above-mentioned piston cylinder is made up of urceolus and inner core;
Inner tank theca is fitted in the internal surface of urceolus, and inwall and piston form the working clearance; Inner core has multiple, the height of each inner core, and external diameter is identical, and thickness is different, changes the inner core of different-thickness to change the working clearance of MR damper.
The design method of the replaceable MR damper of inner core:
The main structure parameters of given MR damper, comprising: urceolus internal diameter D, diameter of piston rod d, the yield strength τ under magnetic flow liquid magnetic field is saturated, MRF zero magnetic field lower yield strength τ
0, MRF null field viscosity η, operating rate v, piston effective length l, seal friction power F
f;
Shearing valve type magneto-rheological damper damping force computation model is expressed as:
Wherein: τ
ythe shearing stress of magnetic flow liquid, relevant with externally-applied magnetic field; η is the null field viscosity of magnetic flow liquid, sgn is-symbol function, and l is the effective length of piston, and v is the movement velocity of piston, and D is piston diameter, and d is diameter of piston rod, and Ap is piston area, and
f
ffor seal friction power, h is damper gap width;
The model of the exerting oneself main structure parameters of given MR damper being substituted into shearing valve type magneto-rheological damper calculates the scope of exerting oneself of damper, only changes the numerical value of working clearance h, other parameter constants, calculates the scope of exerting oneself of damper; Because too small h can make the working clearance block, the value of initial h gets 1mm;
When working clearance h is large and certain value time, the change of the minimum damping force of damper will be very little, and getting this value is maximum working gap; Maximum working gap is divided into multistage, and partitioning standards is the density degree that scope of exerting oneself changes, and the external diameter of internal diameter corresponding to every period of working clearance of inner core, the external diameter of inner core is the internal diameter of urceolus.
The beneficial effects of the utility model are: by replacement to MR damper inner core, can change the working clearance of MR damper, thus realize damper and to exert oneself the variable of scope.When needing maximum damping force larger, use the inner core that internal diameter is little, when the minimum damping force of needs is less, change the inner core that internal diameter is large, avoid the MR damper using different model, provide cost savings.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of MR damper entirety;
The structural representation of accompanying drawing 2 inner core;
Number in the figure title: 1. urceolus, 2. piston, 3. piston rod, 4A. first end cap, 4B. second end cap, 5. coil, 6. magnetic flow liquid, 7. leakage screw, 8. inner core, 9A. first seal ring, 9B. second seal ring.
Embodiment
Be clearly and completely described to the technological scheme in the utility model embodiment below, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment of the present utility model, as shown in Figure 1:
The utility model comprises piston cylinder, is installed on the first end cap 4A and the second end cap 4B at piston cylinder two ends respectively, to be installed in piston cylinder and to stretch out the piston rod 3 of the first end cap 4A and the second end cap 4B; Piston rod 3 is provided with piston 2, piston 2 is wound with coil 5, piston 2 and piston rod 3 are provided with wire guide, and the wire of coil 5 is drawn from wire guide; Filling magnetic flow liquid 6 in piston cylinder; First end cap 4A or the second end cap 4B is respectively arranged with seal ring 9A and seal ring 9B, and the first end cap 9A is provided with the liquid-leaking nozzle closed with leakage screw 7;
Above-mentioned piston cylinder is made up of urceolus 1 and inner core 8;
Inner core 8 outer wall is fitted in the internal surface of urceolus 1, and inwall and piston 2 form the working clearance; Inner core 8 has multiple, the height of each inner core 8, and external diameter is identical, and thickness is different, changes the inner core 8 of different-thickness to change the working clearance of MR damper.
Concrete design example:
Example 1;
Just determine the structural parameter of certain model damper except h as follows:
Shearing valve type magneto-rheological damper damping force computation model is expressed as:
Wherein τ is the shearing stress of magnetic flow liquid, and τ y is the yield stress of magnetic flow liquid, relevant with externally-applied magnetic field.
η is the plastic viscosity of magnetic flow liquid, and γ is the shear strain rate of magnetic flow liquid, sgn is-symbol function.L is the effective length of piston, and piston diameter D, v are the movement velocity of piston, diameter of piston rod d, and damper gap width is h.
Just fixed parameter is substituted into shearing valve type magneto-rheological damper damping force computation model, the scope of the damping force at different gap place can be obtained:
The gap of damper is 1mm, and maximum damping force is 6000N, and minimum damping force is 431N;
The gap of damper is 2mm, and maximum damping force is 3148N, and minimum damping force is 233N;
The gap of damper is 3mm, and maximum damping force is 2200N, and minimum damping force is 187N;
The gap of damper is 4mm, and maximum damping force is 1739N, and minimum damping force is 167N;
Can find out when the working clearance is greater than 3mm, the minimum value change of damping force is not obvious, therefore by working clearance total thickness location 3mm.3mm is divided into 3 layers, 1mm, 2mm, 3mm, needs processing two kinds of specification sleeves.
The internal diameter of inner core 1 is: 42mm external diameter is: 46mm
The internal diameter of inner core 2 is: 44mm external diameter is: 46mm
When use No. 1 inner core, working clearance 1mm, maximum damping force is 6000N, and minimum damping force is 431N
When use No. 2 inner cores, gap becomes 2mm, and maximum damping force is 3148N, and minimum damping force is 233N
When not using inner core, gap becomes 3mm, and maximum damping force is 2200N, and minimum damping force is 187N
Can find out can be reached by this design method and change different sleeve and change damper and to exert oneself the effect of scope.
Example 2:
Just determine the structural parameter of certain model damper except h as follows:
Just fixed parameter is substituted into shearing valve type magneto-rheological damper damping force computation model, the scope of the damping force at different gap place can be obtained:
The gap of damper is 1mm, and maximum damping force is 24280N, and minimum damping force is 2000N;
The gap of damper is 1.5mm, and maximum damping force is 16000N, and minimum damping force is 1060N;
The gap of damper is 2mm, and maximum damping force is 12100N, and minimum damping force is 745N;
The gap of damper is 3mm, and maximum damping force is 8278N, and minimum damping force is 509N;
The gap of damper is 4mm, and maximum damping force is 6382N, and minimum damping force is 413N;
Can find out when the working clearance for being greater than 3mm time, damping force minimum value change not obvious, therefore by the working clearance total thickness location 3mm.3mm is divided into 3 layers, 1mm, 1.5mm, 3mm, needs processing two kinds of specification sleeves.
The internal diameter of inner core 1 is: 42mm external diameter is: 46mm
The internal diameter of inner core 2 is: 43mm external diameter is: 46mm
When use No. 1 inner core, working clearance 1mm, maximum damping force is 24280N, and minimum damping force is 2000N
When use No. 2 inner cores, gap becomes 1.5mm, and maximum damping force is 16000N, and minimum damping force is 1060N
When not using inner core, gap becomes 3mm, and maximum damping force is 8278N, and minimum damping force is that 509N can be found out can be reached by this design method and changes different sleeve and change damper and to exert oneself the effect of scope.
Claims (1)
1. the MR damper that the working clearance is variable,
Comprise piston cylinder, be installed on the first end cap (4A) and second end cap (4B) at piston cylinder two ends respectively, to be installed in piston cylinder and to stretch out the piston rod (3) of the first end cap (4A) and the second end cap (4B); Piston rod (3) is provided with piston (2), piston (2) is wound with coil (5), piston (2) and piston rod (3) are provided with wire guide, and the wire of coil (5) is drawn from wire guide; Filling magnetic flow liquid (6) in piston cylinder; First end cap (4A) or the second end cap (4B) are respectively arranged with the first seal ring (9A) and the second seal ring (9B), and the first end cap (9A) is provided with the liquid-leaking nozzle closed with leakage screw (7);
It is characterized in that:
Above-mentioned piston cylinder is made up of urceolus (1) and inner core (8);
Inner core (8) outer wall is fitted in the internal surface of urceolus (1), and inwall and piston (2) form the working clearance; Inner core (8) has multiple, the height of each inner core (8), and external diameter is identical, and thickness is different, changes the inner core (8) of different-thickness to change the working clearance of MR damper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520002500.9U CN204437164U (en) | 2015-01-04 | 2015-01-04 | The MR damper that working clearance is variable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520002500.9U CN204437164U (en) | 2015-01-04 | 2015-01-04 | The MR damper that working clearance is variable |
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| CN204437164U true CN204437164U (en) | 2015-07-01 |
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| CN201520002500.9U Expired - Fee Related CN204437164U (en) | 2015-01-04 | 2015-01-04 | The MR damper that working clearance is variable |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104534012A (en) * | 2015-01-04 | 2015-04-22 | 南京航空航天大学 | Mageto-rheological damper with changeable working gap and parameter optimizing method thereof |
| CN105041955A (en) * | 2015-07-20 | 2015-11-11 | 常州大学 | Double-pole multistage diffraction passive single-control variable-damping magneto-rheological damper |
| CN105065550A (en) * | 2015-07-18 | 2015-11-18 | 常州大学 | Self-adaptive magnetorheological damper with double-pole gradient cylinder |
| CN105065558A (en) * | 2015-07-20 | 2015-11-18 | 常州大学 | Active double-control variable-damping magneto-rheological damper with single pole and variable orifice |
-
2015
- 2015-01-04 CN CN201520002500.9U patent/CN204437164U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104534012A (en) * | 2015-01-04 | 2015-04-22 | 南京航空航天大学 | Mageto-rheological damper with changeable working gap and parameter optimizing method thereof |
| CN104534012B (en) * | 2015-01-04 | 2016-06-01 | 南京航空航天大学 | The MR damper that working clearance is variable and parameter optimization method thereof |
| CN105065550A (en) * | 2015-07-18 | 2015-11-18 | 常州大学 | Self-adaptive magnetorheological damper with double-pole gradient cylinder |
| CN105041955A (en) * | 2015-07-20 | 2015-11-11 | 常州大学 | Double-pole multistage diffraction passive single-control variable-damping magneto-rheological damper |
| CN105065558A (en) * | 2015-07-20 | 2015-11-18 | 常州大学 | Active double-control variable-damping magneto-rheological damper with single pole and variable orifice |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20170104 |