CN107327533B - Magneto-rheological mud damper - Google Patents
Magneto-rheological mud damper Download PDFInfo
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- CN107327533B CN107327533B CN201710569055.8A CN201710569055A CN107327533B CN 107327533 B CN107327533 B CN 107327533B CN 201710569055 A CN201710569055 A CN 201710569055A CN 107327533 B CN107327533 B CN 107327533B
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- mud
- iron core
- cylinder body
- magnetorheological
- piston
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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)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
the invention discloses a magneto-rheological mud damper, which consists of a cylindrical cylinder body with a sealing cover, a piston positioned in the cylinder body and an iron core embedded in the piston and mutually matched with the piston; magnetorheological mud is filled in the cylinder body; the magnet exciting coil is wound on the iron core, a through hole structure I penetrating through the iron core is arranged on the iron core in the direction perpendicular to the magnetic field generated by the magnet exciting coil, and the through hole structure I is communicated with a through hole structure II on the piston to form a magneto-rheological mud channel; pull rods are symmetrically arranged on two sides of the piston, extend out of the cylinder body and are sealed at the connection part of the pull rods and the cylinder body sealing cover; the magnet exciting coil on the iron core is connected with an external power supply through a pore passage in the pull rod. The magneto-rheological mud channel of the magneto-rheological mud damper is positioned in the piston, so that the regulation and control effect is good; the iron core can be replaced, and the mechanical property of the damper is adjustable; the iron core is not stressed directly and has good durability; the magnetorheological mud has high shear yield strength and good anti-settling property.
Description
Technical Field
The invention relates to a magneto-rheological mud damper, and belongs to the technical field of vibration isolation and reduction devices.
Background
with the development of the country and the improvement of the living standard, the important structures such as high-rise buildings, high-rise structures, large-span structures and the like are increasing day by day. Under the action of dynamic loads (such as strong wind and earthquake), the structures can generate larger vibration, the normal use and safety of the structures are influenced, and how to reduce the wind vibration or earthquake reaction of the structures is a leading and important subject. Structural vibration control is a new type of seismic countermeasure, namely, dissipating or isolating vibration energy by providing a shock absorbing or isolating device in the structure, or applying external energy to counteract the effect of external excitation on the structure. The magnetorheological mud is a semi-active control device manufactured by utilizing the characteristic that the shearing yield strength of the magnetorheological material changes along with the strength of an external magnetic field, and is favored by researchers and becomes a research hotspot due to the characteristics of low power consumption, controllability, large output force and small time lag, and the stability of passive control and the adjustability of active control.
The adjustability of the magneto-rheological mud damper is realized by applying a variable magnetic field to the magneto-rheological mud in the magneto-rheological mud damper to enable the magneto-rheological mud to be inverted between a plastic body and a solid body. The magnetorheological mud is used as a novel magnetorheological material, and generally consists of magnetic conductive particles, a non-magnetic conductive plastic matrix and some additives in order to realize the inversion characteristic. Compared with magnetorheological fluid, the magnetorheological mud has better anti-settling property and larger zero-field viscosity. Under the condition of zero magnetic field, the magnetorheological mud is in a plastic state, and the viscosity and the hardness of the magnetorheological mud are both greater than corresponding indexes of the magnetorheological mud. In view of the fact that few researches on the magnetorheological sludge are conducted at home and abroad at present, few researches on the magnetorheological sludge damper are conducted, and the structure of the common magnetorheological damper is not suitable for the magnetorheological sludge, and although the high viscosity of the magnetorheological sludge brings excellent anti-settling property, the coil is easy to wear. Compared with magnetorheological fluid, the magnetorheological mud has the advantage that the high viscosity of the magnetorheological mud is also regulated by a more sensitive uniform magnetic field. These problems have resulted in significant limitations in the practical application of magnetorheological mud dampers.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of providing a magneto-rheological mud damper which has the advantages of replaceable iron core, capability of generating a large uniform and strong adjustable magnetic field and good durability.
The invention content is as follows: in order to solve the technical problems, the technical means adopted by the invention is as follows:
A magneto-rheological mud damper is composed of a cylindrical cylinder body, a piston positioned in the cylinder body and an iron core embedded in the piston and mutually matched with the piston; magnetorheological mud is filled in the cylinder body; the magnet exciting coil is wound on the iron core, a through hole structure I penetrating through the iron core is arranged on the iron core in the direction perpendicular to the magnetic field generated by the magnet exciting coil, and the through hole structure I is communicated with a through hole structure II on the piston to form a magneto-rheological mud channel; pull rods are symmetrically arranged on two sides of the piston, extend out of the cylinder body and are in sealing connection with the cylinder body sealing cover; the magnet exciting coil on the iron core is connected with an external power supply through a pore passage in the pull rod.
And a steel pipe is laid in the magnetorheological mud channel and is fixed in the magnetorheological mud channel through epoxy resin.
wherein, the magnetorheological mud channels are provided with a plurality of channels which are respectively arranged at the upper end and the lower end of the iron core.
the cylinder body and the cylinder body sealing covers are connected in a matched mode through internal threads and external threads.
Wherein, be equipped with the magnetic current mud pouring hole on the cylinder body, the pouring hole is last to have sealing device.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
Firstly, the flow channel of the magnetorheological mud in the damper is vertical to the excitation coil (the direction of generating a magnetic field), the flow channel is positioned in the iron core and the coil, and the magnetic field in the iron core is a uniform magnetic field, so that the regulation and control effect is good, the effective working area is enlarged, and the adjustability of the damper is improved;
Secondly, the magnet exciting coil is adjusted into the piston from the outside of the piston, and the surrounding direction of the coil is changed into the horizontal direction, so that the high-viscosity magneto-rheological mud can be effectively prevented from being directly contacted with the magnet exciting coil, the coil is prevented from being damaged, and meanwhile, the iron core is not directly stressed, so that the durability of the magnet exciting coil is improved;
moreover, the flow channel of the magnetorheological mud in the magnetorheological mud damper is not a gap between the piston and the cylinder body, but two small, long and narrow circular pore channels in the piston, so that the output of the damper can be improved;
Finally, the magnetorheological mud damper adopts the split design of the iron core with the excitation coil and the piston, is beneficial to the replacement of coils with different excitation capacities, and can effectively change the mechanical characteristics of the magnetorheological mud damper according to different application occasions, thereby having wide application range; the magneto-rheological mud damper has larger output and better adjustability under the same size.
Drawings
FIG. 1 is a schematic axial cross-sectional view of a magnetorheological mud damper in accordance with the present invention;
FIG. 2 is a schematic structural diagram of an iron core in the magnetorheological mud damper of the present invention;
FIG. 3 is a side view of a piston in the magnetorheological mud damper of the present invention;
FIG. 4 is a top view of a piston in the magnetorheological mud damper of the present invention.
Detailed Description
The invention will be better understood from the following examples. However, those skilled in the art will readily appreciate that the description of the embodiments is only for illustrating the present invention and should not be taken as limiting the invention as detailed in the claims.
As shown in fig. 1 to 4, the magnetorheological mud damper of the invention comprises a cylindrical cylinder 4, a piston 7 positioned in the cylinder 4, and an iron core 9 embedded in the piston 7 and engaged with the piston 7; magnetorheological mud is filled in the cylinder body 4; the peripheries of the piston 7 and the iron core 9 are tightly fit with the inner wall of the cylinder 4, and magnetorheological mud cannot flow from gaps between the piston 7 and the iron core 9 and the cylinder 4; an excitation coil 10 is wound on the iron core 9, a through hole structure I12 penetrating through the iron core is arranged on the iron core 9 in the vertical direction of a magnetic field generated by the excitation coil 10, the through hole structure I12 is communicated with a through hole structure II6 on the piston 7 to form a magneto-rheological mud channel 13, a steel pipe 8 is laid in the magneto-rheological mud channel 13, the steel pipe 8 is fixed in the magneto-rheological mud channel 13 through epoxy resin, and magneto-rheological mud flows through the steel pipe 8 in the magneto-rheological mud channel 13; pull rods 1 are symmetrically arranged on two sides of the piston 7, and the pull rods 1 extend out of the cylinder body 4 and are hermetically connected with the cylinder body sealing cover 3 through sealant; the magnet exciting coil 10 on the iron core 9 is connected with an external power supply through the pore channel 2 in the pull rod 1; two ends of the cylinder body 4 are provided with cylinder body seal covers 3, and the cylinder body 4 and the cylinder body seal covers 3 are mutually matched and connected through internal and external threads; the cylinder body 4 is provided with a magnetorheological mud pouring hole 11, the pouring hole 11 is used for pouring magnetorheological mud into the cylinder body 4 and pouring out the cylinder body 4, and the pouring hole 11 is provided with a sealing device. The magnetorheological mud channels 13 can be multiple and are respectively arranged at the upper end and the lower end of the iron core 9.
The piston pull rod 1 comprises a pull rod hole 2 for placing an electric wire and is used for electrifying a coil 10 on an iron core 9; the piston 7 and the iron core 9 move in the cylinder body 4 in a reciprocating manner, the inner space 5 of the cylinder body 4 is used for filling magnetorheological mud, the cylinder body sealing cover 3 and the cylinder body 4 are screwed and connected into a whole through threads, and sealant is coated on the sealing cover; the joint of the piston pull rod 1 and the cylinder body sealing cover 3 is also coated with sealant for sealing, the piston 7 is tightly matched with the cylinder body 4, and two ends of an iron core 9 made of electrician pure iron are made into circular arcs and are also tightly matched with the cylinder body 4 (shell). The piston 7 is connected with the iron core 9 through a cylindrical hollow steel pipe 8, the steel pipe 8, a through hole structure II6 and a through hole structure I12 in the iron core 9 are coated with epoxy resin and are connected and fixed, the cylindrical steel pipe 8 is also used as a channel of magnetorheological mud, an electrified coil 10 is wound in the middle of the iron core 9, the coil 10 is connected with the outside through a pull rod hole channel 2, and the magnetic field control in the damper is realized; the magnetorheological mud is poured or taken out through the two pouring holes 11 on the cylinder body 4.
When the magneto-rheological mud damper bears external load (vibration), the piston 7 and the pull rod 1 reciprocate in the cylinder body 4 (the cylinder body 4 is made of metal), magneto-rheological mud in the inner cavity 5 of the cylinder body 4 is forced to move back and forth on two sides of the piston 7 through the magneto-rheological mud channel 13, and in the moving process, the piston 7 needs to overcome the damping force of the magneto-rheological mud to do work and consume energy, so that the damping effect is achieved. According to the actual situation, the shearing yield strength of the magnetorheological mud can be changed by adjusting the current in the coil 10, so that the damping force can be changed. The coil is usually wound by 50-5000 turns, and the diameter of the coil is 0.1-2 mm.
In the magneto-rheological mud damper, the steel pipe 8 sequentially penetrates through the through hole structure II6 on the piston 7 and the through hole structure I12 in the iron core 9, so that the steel pipe plays a role in connecting the iron core 9 and the piston 7 on one hand, and also serves as a channel for magneto-rheological mud on the other hand. The protruding parts of the iron core 9 are tightly matched with the inner walls of the cylinder body 4 (shell) and the piston 7, a plurality of layers of coils are wound on the necking part in the middle of the iron core 9, the number of turns is determined by the requirement of output force, and the diameter of the iron core 9 after the coils are wound cannot exceed the diameter of the protruding parts on the two sides of the iron core 9, so that the cylindrical electromagnetic iron core 9 can be inserted into the hole of the piston 7. The structure can ensure that the coil 10 and the iron core 9 do not directly receive force in the reciprocating motion process of the piston 7, thereby effectively solving the problems of abrasion of the coil 10 and the durability of the iron core 9 caused by high viscosity of the magnetorheological mud. The magnetorheological mud is perpendicular to the direction of a magnetic field generated by the coil 10 through the steel pipe 8, the coil 10 forms a uniform magnetic field in the through hole structure I12 in the iron core 9, the direction of magnetic lines of force is perpendicular to the movement direction of the magnetorheological mud, and a magnetic chain formed by ferromagnetic particles in the magnetorheological mud can effectively block the movement of the magnetorheological mud, so that the damper has a large effective working area and good adjustability.
According to the magneto-rheological mud damper, direct contact between the iron core 9 and the coil 10 and magneto-rheological mud is well avoided, abrasion of the coil 10 and the iron core 9 due to movement of the magneto-rheological mud can be effectively avoided, the winding direction of the coil 10 is parallel to the movement direction of the magneto-rheological mud, so that a uniform magnetic field in a magneto-rheological mud channel in the iron core 9 is perpendicular to the channel direction, channels in the whole iron core 9 are effective working areas, magnetic induction lines in the coil 10 are dense, the magnetic field regulation and control effect is good, and the structure can obtain larger output by combining with high viscosity of the magneto-rheological mud; in addition, according to the needs of actual conditions, the iron core wound with different coil turns can be replaced to obtain different maximum output force, the efficiency of the whole device is high, the whole device has large output force and a regulation range, and the whole device has good durability.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.
Claims (3)
1. A magneto-rheological mud damper is characterized in that: the device consists of a cylindrical cylinder body with a sealing cover, a piston positioned in the cylinder body and an iron core which is embedded in the piston and mutually matched with the piston; magnetorheological mud is filled in the cylinder body; the magnet exciting coil is wound on the iron core, a through hole structure I penetrating through the iron core is arranged on the iron core in the direction perpendicular to the magnetic field generated by the magnet exciting coil, and the through hole structure I is communicated with a through hole structure II on the piston to form a magneto-rheological mud channel; pull rods are symmetrically arranged on two sides of the piston, extend out of the cylinder body and are in sealing connection with the cylinder body sealing cover; the magnet exciting coil on the iron core is connected with an external power supply through a pore channel in the pull rod; a steel pipe is laid in the magnetorheological mud channel and is fixed in the magnetorheological mud channel through epoxy resin; the magnetorheological mud channels are respectively arranged at the upper end and the lower end of the iron core; the magnetorheological mud moves along the direction vertical to the magnetic field generated by the coil through the steel pipe; the diameter of the iron core wound with the excitation coil part does not exceed the diameter of the protruding parts on the two sides of the iron core.
2. The magnetorheological mud damper of claim 1, wherein: the two ends of the cylinder body are provided with cylinder body sealing covers, and the cylinder body sealing covers are connected in a matched mode through internal threads and external threads.
3. The magnetorheological mud damper of claim 1, wherein: the magnetorheological sludge cylinder is characterized in that a magnetorheological sludge filling hole is formed in the cylinder body, and a sealing device is arranged on the filling hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710569055.8A CN107327533B (en) | 2017-07-12 | 2017-07-12 | Magneto-rheological mud damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710569055.8A CN107327533B (en) | 2017-07-12 | 2017-07-12 | Magneto-rheological mud damper |
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| Publication Number | Publication Date |
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| CN107327533A CN107327533A (en) | 2017-11-07 |
| CN107327533B true CN107327533B (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710569055.8A Active CN107327533B (en) | 2017-07-12 | 2017-07-12 | Magneto-rheological mud damper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108265847B (en) * | 2018-02-27 | 2019-12-27 | 同济大学 | Piston type particle damper |
| CN108466636A (en) * | 2018-03-18 | 2018-08-31 | 昆明创培知识产权服务有限公司 | A kind of track intelligence accident prevention system and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587738A (en) * | 2004-07-09 | 2005-03-02 | 北京工业大学 | Inverse type magnetic flow damper |
| CN102889331A (en) * | 2012-10-19 | 2013-01-23 | 北京交通大学 | Valve control constant magnetic magnetorheological damper |
| DE102012013480A1 (en) * | 2012-07-09 | 2014-01-09 | Inventus Engineering Gmbh | Assembly and method of manufacturing an assembly |
| CN104675905A (en) * | 2015-03-10 | 2015-06-03 | 中国科学技术大学 | Buffer using magneto-rheological cement gum |
| CN105805217A (en) * | 2016-05-09 | 2016-07-27 | 江苏大学 | Magneto-rheological damper for circular magnetic circuit |
-
2017
- 2017-07-12 CN CN201710569055.8A patent/CN107327533B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587738A (en) * | 2004-07-09 | 2005-03-02 | 北京工业大学 | Inverse type magnetic flow damper |
| DE102012013480A1 (en) * | 2012-07-09 | 2014-01-09 | Inventus Engineering Gmbh | Assembly and method of manufacturing an assembly |
| EP2870379A1 (en) * | 2012-07-09 | 2015-05-13 | Inventus Engineering GmbH | Method for producing a subassembly and subassembly |
| CN102889331A (en) * | 2012-10-19 | 2013-01-23 | 北京交通大学 | Valve control constant magnetic magnetorheological damper |
| CN104675905A (en) * | 2015-03-10 | 2015-06-03 | 中国科学技术大学 | Buffer using magneto-rheological cement gum |
| CN105805217A (en) * | 2016-05-09 | 2016-07-27 | 江苏大学 | Magneto-rheological damper for circular magnetic circuit |
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| CN107327533A (en) | 2017-11-07 |
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