CN108506405B - Double-cylinder double-rod flow type magneto-rheological damper - Google Patents
Double-cylinder double-rod flow type magneto-rheological damper Download PDFInfo
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- CN108506405B CN108506405B CN201810273335.9A CN201810273335A CN108506405B CN 108506405 B CN108506405 B CN 108506405B CN 201810273335 A CN201810273335 A CN 201810273335A CN 108506405 B CN108506405 B CN 108506405B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/20—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with the piston-rod extending through both ends of the cylinder, e.g. constant-volume dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a double-cylinder double-outlet-rod flow type magneto-rheological damper, which comprises a piston cylinder and an electromagnet cylinder; the inner spaces of the piston cylinder body and the electromagnet cylinder body are filled with magnetorheological fluid; a piston is arranged in the piston cylinder body, a piston rod connected to the piston penetrates through the piston cylinder body in a sealing manner, and cavities on two sides of the piston in the piston cylinder body are respectively communicated with the electromagnet cylinder body through guide pipes; an electromagnet is arranged in the electromagnet cylinder body; the magnetic conduction area generated by the electromagnet is used for controlling the magnetorheological fluid to generate the magnetorheological effect. The installation of special maintenance devices can be avoided and the reliability is very high compared with the common mechanical elements during use. The energy required by the device is very low, and even if the energy in the earthquake is interrupted, the device can still be used as a passive energy consumption device to continuously play a control role; the rheological body in the damper can realize the alternation of free flow, viscous flow and semi-solid state by controlling the change of the electric field and the magnetic field within a few milliseconds.
Description
Technical Field
The invention relates to the field of structural vibration control, in particular to a double-cylinder double-rod flow type magneto-rheological damper.
Background
With the rapid development of modern society and economy, people put forward stricter requirements on earthquake-resistant safety and usability of buildings than before, such as: in order to ensure the smooth operation of emergency rescue and relief work after an earthquake, hospitals, communication centers, fire-fighting facilities, important traffic bridges and the like not only require that the structure is not seriously damaged in the earthquake, but also require that the normal use function of the earthquake-proof emergency rescue and relief work cannot be lost; modern high-precision buildings such as industrial factory buildings, computing centers and the like require that the structural response of the buildings under earthquake cannot be overlarge in order to ensure that expensive indoor equipment and instruments are not damaged. Based on this, the research and application of structural vibration control are increasingly receiving attention.
The magneto-rheological damper is a typical semi-active variable damping vibration control device developed on the basis of magneto-rheological effect. When the magneto-rheological damper is applied, the magneto-rheological damper can be arranged on the structure in a damper supporting mode, so that the rigidity and the damping of the structure are increased; the magnetorheological damper is arranged between the adjacent structures or the main attached structure, so that the vibration energy can be redistributed among the structures; meanwhile, the magnetorheological damper can be mixed with a shock insulation system to form a semi-active shock insulation system, and the aim of reducing the seismic response is fulfilled.
However, the current scholars in China still have a lot of problems in the aspect of the development of novel magnetorheological dampers, the magnetorheological dampers used in the field of the current domestic structural vibration control are mostly products purchased in foreign countries, the number of self-developed products is small, and most of the current magnetorheological dampers in China have the problems that the structural design is unreasonable, the magnetic induction intensity and the distribution cannot meet the use requirements and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a double-cylinder double-rod flow type magneto-rheological damper which is simple in structure, high in response speed, good in durability, large in damping force and continuously adjustable.
The invention is realized by the following technical scheme:
a double-cylinder double-outlet-rod flow type magneto-rheological damper comprises a piston cylinder and an electromagnet cylinder; the inner spaces of the piston cylinder body and the electromagnet cylinder body are filled with magnetorheological fluid;
a piston is arranged in the piston cylinder body, a piston rod connected to the piston penetrates through the piston cylinder body in a sealing manner, and cavities on two sides of the piston in the piston cylinder body are respectively communicated with the electromagnet cylinder body through guide pipes;
an electromagnet is arranged in the electromagnet cylinder body; the magnetic conduction area generated by the electromagnet is used for controlling the magnetorheological fluid to generate the magnetorheological effect.
Preferably, the direction of the magnetic force lines of the magnetic conduction area generated by the electromagnet is perpendicular to the flowing direction of the magnetorheological fluid.
Preferably, the electromagnet comprises an iron core provided with a plurality of coil slots, the number of turns of the winding wire on each coil slot is equal, and the directions of the winding wires between two adjacent coil slots are opposite.
Furthermore, the electromagnet comprises an iron core provided with four coil grooves, at least 400 circles of enameled wires are wound on each coil groove, and the wire diameter of each enameled wire is 0.2mm to 0.9 mm.
Preferably, an annular gap is provided between the electromagnet and the inner wall of the cylinder block as a damping channel.
Preferably, an annular gap of not more than 1mm is provided between the electromagnet and the inner wall of the electromagnet cylinder body as a damping channel.
Preferably, the guide pipe is hermetically connected to the piston cylinder and the electromagnet cylinder respectively through bolts.
Preferably, the piston rod is arranged to penetrate through the piston rigid body through sealing rotation of the sealing colloid, and an electromagnet outgoing line for supplying power to the electromagnet is arranged to penetrate through the electromagnet cylinder body.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a double-cylinder double-rod flow type magneto-rheological damper, which utilizes magneto-rheological effect to develop a typical semi-active variable damping control device, and adopts a piston double-rod mode, so that a compensator is not required to be additionally arranged to contain magneto-rheological liquid during use, and a servo valve is not required to be arranged, thereby avoiding the installation of a special maintenance device, and having strong reliability compared with common mechanical elements during use. The energy required by the device is very low, and even if the energy in the earthquake is interrupted, the device can still be used as a passive energy consumption device to continuously play a control role; the rheological body in the damper can realize the alternation of free flow, viscous flow and semi-solid state by controlling the change of the electric field and the magnetic field within a few milliseconds.
Drawings
Fig. 1 is a schematic structural view of the damper according to the embodiment of the present invention.
In the figure: 1. the magnetorheological fluid comprises an electromagnet lead-out wire, 2 an electromagnet cylinder body, 3 a coil, 4 an electromagnet, 5 an annular gap, 6 a bolt, 7 a guide pipe, 8 a piston rod, 9 a sealing colloid, 10 a piston cylinder body, 11 a piston, 12 and magnetorheological fluid.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a double-cylinder double-outlet-rod flow type magnetorheological damper, which consists of two cylinders, as shown in figure 1, wherein the two cylinders are respectively a piston cylinder 10 and an electromagnet cylinder 2, a piston 11 and a piston rod 8 are arranged in the piston cylinder 10, the piston rod 8 passes through a piston rigid body 10 through a sealing colloid 9 in a sealing and rotating manner, and the inner space of the piston cylinder 10 is filled with magnetorheological fluid 12; an electromagnet 4 wound with a coil 3 is arranged in the electromagnet cylinder body 2, an electromagnet leading-out wire 1 penetrates through the electromagnet cylinder body 2 to be led out, and a 1mm annular gap is reserved between the electromagnet 4 and the inner wall of the electromagnet cylinder body 2 to serve as a damping channel. The two cylinders are connected by a guide pipe 7, and the preferable guide pipe 7 is respectively connected on the piston cylinder 10 and the electromagnet cylinder 2 in a sealing way through bolts 6. The electromagnet 4 is an iron core with four coil grooves, enameled wires with the wire diameter of 0.9mm are wound on each coil groove for about 400 circles, and the directions of the wound coils between two adjacent coil grooves are opposite, so that the direction of magnetic lines of force in a magnetic conduction area is ensured to be in a state of being vertical to the flowing direction of magnetorheological fluid, and the best magnetorheological effect can be obtained. On the premise of improving the working reliability of the damper, the magnetorheological damper has larger working damping force and a certain adjusting range, and can fully meet the requirement of vibration control of a building structure.
After the magnetorheological damper is mounted in the corresponding position, when the magnetorheological damper is operated, the piston rod 8 can make the piston 11 perform stretching or compressing reciprocating motion due to the action of external excitation. Because the movement of the piston 11 will push the magnetorheological fluid 12 in the piston cylinder 10 to flow into the electromagnet cylinder 2 through the conduit 7, in the electromagnet cylinder 2, an annular gap 5 with a gap of 1mm is left between the electromagnet cylinder 2 and the electromagnet 4, and the magnetorheological fluid can only flow back to the piston cylinder 10 from the annular gap 5.
When the electromagnet 4 is not electrified, the magnetorheological fluid between the annular gaps 5 can be considered as the flow of Newtonian fluid, according to the knowledge of fluid mechanics, when the Newtonian fluid passes through the narrow gaps, a pressure gradient is generated in the fluid, so that a pressure difference is formed between two ends of the piston 11, and the pressure difference is the passive damping force generated by the magnetorheological damper.
When the electromagnet 4 is electrified, a magnetic field perpendicular to the flowing direction of the magnetorheological fluid 12 is generated in the range of the magnetic conduction area of the electromagnet 4, when the magnetorheological fluid flows through the annular gap 5 with the magnetic field, the magnetorheological fluid 12 generates a magnetorheological effect, namely, a blocking flowing area is formed in the middle of the annular flowing gap 5, so that the pressure gradient in the fluid is increased, the pressure difference between two ends of the piston 11 is increased, the damping force output by the damper is increased, the damping force generated by applying the magnetic field is called as active damping force, the strength change of the magnetic field can be controlled by applying currents with different strengths to the electromagnet 4, and the strength of the active damping force is controlled, so that the magnetorheological damper has adjustability.
Claims (3)
1. A double-cylinder double-outlet-rod flow type magneto-rheological damper is characterized by comprising a piston cylinder (10) and an electromagnet cylinder (2); the inner spaces of the piston cylinder body (10) and the electromagnet cylinder body (2) are filled with magnetorheological fluid (12);
a piston (11) is arranged in the piston cylinder body (10), a piston rod (8) connected to the piston (11) is arranged to penetrate through the piston cylinder body (10) in a sealing manner, and cavities on two sides of the piston (11) in the piston cylinder body (10) are respectively communicated with the electromagnet cylinder body (2) through guide pipes (7);
an electromagnet (4) is arranged in the electromagnet cylinder body (2); the magnetic conduction area generated by the electromagnet (4) is used for controlling the magnetorheological fluid (12) to generate a magnetorheological effect;
the direction of magnetic force lines of a magnetic conduction area generated by the electromagnet (4) is vertical to the flowing direction of the magnetorheological fluid (12);
the electromagnet (4) comprises an iron core provided with a plurality of coil slots, the number of turns of winding wires on each coil slot is equal, and the directions of winding coils between two adjacent coil slots are opposite;
an annular gap with the thickness not more than 1mm is arranged between the electromagnet (4) and the inner wall of the electromagnet cylinder body (2) and is used as a damping channel;
the piston rod (8) is sealed by a sealing colloid (9) and rotates to penetrate through the piston cylinder body (10), and an electromagnet outgoing line (1) for supplying power to the electromagnet (4) penetrates through the electromagnet cylinder body (2) and is led out;
when the electromagnet (4) is not electrified, the magnetorheological fluid between the annular gaps (5) forms Newton fluid, and when the Newton fluid passes through the narrow gaps, pressure gradient is generated in the fluid, so that passive damping force is formed at two ends of the piston (11);
when the electromagnet (4) is electrified, the magnetic conduction area of the electromagnet (4) generates a magnetic field perpendicular to the flowing direction of the magnetorheological fluid (12), and when the magnetorheological fluid (12) flows through the annular gap (5) with the magnetic field, the magnetorheological fluid (12) generates a magnetorheological effect to form an active damping force.
2. The double-cylinder double-rod flow type magnetorheological damper according to claim 1, wherein the electromagnet (4) comprises an iron core with four coil slots, at least 400 circles of enameled wires are wound on each coil slot, and the wire diameter of the enameled wires is 0.2mm to 0.9 mm.
3. The double-cylinder double-rod flow type magnetorheological damper as claimed in claim 1, wherein the guide pipe (7) is hermetically connected to the piston cylinder (10) and the electromagnet cylinder (2) respectively through bolts (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810273335.9A CN108506405B (en) | 2018-03-29 | 2018-03-29 | Double-cylinder double-rod flow type magneto-rheological damper |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810273335.9A CN108506405B (en) | 2018-03-29 | 2018-03-29 | Double-cylinder double-rod flow type magneto-rheological damper |
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| CN108506405A CN108506405A (en) | 2018-09-07 |
| CN108506405B true CN108506405B (en) | 2020-10-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019112190A1 (en) * | 2019-05-09 | 2020-11-12 | Mack Rides Gmbh & Co. Kg | Locking device of a safety bar, passenger reception and amusement ride with such a locking device |
| CN110822009B (en) * | 2019-11-26 | 2021-02-05 | 重庆大学 | Separated double-cylinder magnetorheological damper |
| CN111895031A (en) * | 2020-07-28 | 2020-11-06 | 河海大学 | Magnetorheological fluid damper with heat insulation function |
| CN114483862A (en) * | 2022-01-04 | 2022-05-13 | 株洲时代新材料科技股份有限公司 | Magneto-rheological damper |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE202004008024U1 (en) * | 2004-05-19 | 2005-10-06 | Bauerfeind Ag | Adjustable motion damper |
| US9453552B2 (en) * | 2014-07-14 | 2016-09-27 | Honeywell International Inc. | Adaptive three parameter isolator assemblies including external magneto-rheological valves |
| CN106168266A (en) * | 2016-08-11 | 2016-11-30 | 张广 | A kind of double rod by-pass type magneto-rheological vibration damper |
| CN206145049U (en) * | 2016-11-13 | 2017-05-03 | 华东交通大学 | Damper system is controlled to asymmetric magnetorheological valve |
| CN206159354U (en) * | 2016-11-16 | 2017-05-10 | 华东交通大学 | Twin coil magnetorheological valve accuse double acting cylinder damping system |
| CN107061603B (en) * | 2017-03-21 | 2019-02-01 | 哈尔滨工程大学 | A kind of magnetorheological fluid Multi-regulation vibration isolator |
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