CN111946127B - Magnetorheological elastomer intelligent shock insulation support with high vertical bearing capacity - Google Patents
Magnetorheological elastomer intelligent shock insulation support with high vertical bearing capacity Download PDFInfo
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- CN111946127B CN111946127B CN202010837123.6A CN202010837123A CN111946127B CN 111946127 B CN111946127 B CN 111946127B CN 202010837123 A CN202010837123 A CN 202010837123A CN 111946127 B CN111946127 B CN 111946127B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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Abstract
An intelligent isolation bearing with high vertical bearing capacity for a magnetorheological elastomer. The magnetorheological damper comprises an upper base plate, a lower base plate, a magnetorheological elastomer, a steel plate, a permanent magnet, a universal hinge, a vertical connecting rod, a steel cylinder, a coil and a magnetic conduction guide rod; the magnetorheological elastomer intelligent shock-insulation support with high vertical bearing capacity can integrally form a closed magnetic circuit, and the size of a magnetic field generated by a permanent magnet can be changed by changing the size of current applied to a coil, so that the adjustable range of the rigidity of the magnetorheological elastomer can be expanded; the vertical connecting rod and the universal hinge are arranged in the support, so that vertical load can be borne, the deformation of the magnetorheological elastomer and the coil is reduced, the magnetorheological effect of the support and the stability of the coil are ensured, and the service life is prolonged; the support has the advantages of high safety, strong controllability and the like, and solves the problem that the conventional shock isolation device has poor shock absorption effect under the action of the short-fault long-period velocity and displacement pulse earthquake.
Description
Technical Field
The invention belongs to the technical field of vibration control of civil and architectural engineering, and particularly relates to a magnetorheological elastomer intelligent shock-insulation support with high vertical bearing capacity.
Background
The magnetorheological elastomer is a novel composite intelligent material and is formed by combining three basic components, namely soft magnetic particles, an elastomer matrix and an additive. The magnetorheological elastomer overcomes the problems of sedimentation and stability of the magnetorheological fluid, has the advantages of adjustable rigidity, strong reversibility, excellent mechanical property, quick response and the like, and has great development potential in the fields of civil engineering, machinery, aerospace and the like, thereby attracting many scholars to research. One research focus of the magnetorheological elastomer is to apply the magnetorheological elastomer to a shock insulation and vibration reduction device, and solve some problems encountered by the traditional shock insulation and vibration reduction device. At present, scholars at home and abroad research different forms of magnetorheological elastomer shock insulation supports. The establishment and maintenance of the university of Wuhan theory and engineering and the like provides a laminated intelligent adjustable shock insulation support capable of adaptively adjusting the shearing performance, and the support can intelligently adjust the horizontal equivalent stiffness and the equivalent damping ratio of the support so as to adapt to the change of external dynamic load. The invention discloses a combined magnetorheological elastomer intelligent shock insulation support which is invented by Oncaomna minor of the university of the great-continuing work and university, makes full use of the mechanical and electromagnetic properties of materials, has high space utilization rate and magnetic field utilization rate, uniform magnetic field and less magnetic leakage, greatly reduces the size of a coil, reduces the production, use and maintenance cost, has the appearance similar to that of a lead core rubber support, and is convenient to design and construct. Li et al, Sydney scientific and technical university, have proposed a new type of vibration isolator for the basic vibration isolation system, namely the adaptive vibration isolator, this new type of adaptive vibration isolator utilizes the field sensitive material characteristic of the magneto-rheological elastomer, has adopted the design of the traditional vibration isolator, have the laminated structure of the unique steel and magneto-rheological layer, the study shows, the reinforcement of this magneto-rheological vibration isolator can reach 45%, the rigidity can reach 38%. Then, Li et al conducted research and development of a novel highly adjustable magnetorheological basic vibration isolator, designed and manufactured a soft magnetic rheological material with a shear modulus increased by 1300% at a magnetic field of 0.44T, and then applied it in a laminated structure designed for a basic isolator, and then conducted comprehensive experimental research on a prototype of the novel highly adjustable magnetorheological basic isolator, and test results and subsequent analysis showed that the novel magnetorheological basic vibration isolator has significant self-adaptive capability, i.e., when applied current is switched from 0.0 to 3.0A, it can generate a force increase of up to 1479% and a stiffness increase of 1630%. Yang et al, university of Wollongong, designed and manufactured a negative variable stiffness magnetorheological seismic isolation device that included a hybrid magnetic system that generated a magnetic field that was superimposed by a permanent magnetic field and an electromagnetic field, the main feature of which was that it allowed the overall magnitude of the magnetic field to be increased and decreased, i.e., the lateral stiffness of the isolation device to be increased and decreased, studies showed that the effective stiffness decreased when positive current was applied and increased when negative current was applied. Behrooz et al, university of Nevada, USA, proposes a novel variable stiffness damped isolation device, it is that a rigidity and damping are adjustable and adopt the isolation bearing of upper and lower twin coil design, and research shows that the device all shows good shock attenuation effect under the seismic waves of difference, and the isolation device that receives shows well in the aspect of reducing acceleration and relative displacement. Although the performance of the magnetorheological elastomer shock-insulation support is continuously improved in recent years, the magnetorheological effect of the magnetorheological elastomer shock-insulation support is attenuated along with the increase of the strain of the material, and the performance of the magnetorheological elastomer shock-insulation support under the condition of large deformation is obviously lower than that under the condition of small deformation, so that the problem of reducing the strain of the material is one problem to be solved at present. Therefore, there is a need for further improvements in intelligent seismic isolation devices.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a magnetorheological elastomer intelligent vibration-isolating support with high vertical bearing capacity.
In order to achieve the purpose, the magnetorheological elastomer intelligent shock insulation support with high vertical bearing capacity provided by the invention comprises an upper base plate, a lower base plate, a magnetorheological elastomer, a steel plate, a permanent magnet, a universal hinge, a vertical connecting rod, a steel cylinder, a coil and a magnetic guide rod; wherein, a plurality of lower connecting bolt holes are formed on the peripheral edge of the lower bottom plate at intervals; the upper bottom plate is horizontally arranged above the lower bottom plate, a plurality of smooth sliding grooves are formed by inwards sinking the outer part of the bottom surface at intervals along the circumferential direction, and a plurality of upper connecting bolt holes are formed at intervals of the peripheral edge; the upper end of one magnetic conduction guide rod is connected with the middle part of the bottom surface of the upper bottom plate, and the lower end of the other magnetic conduction guide rod is connected with the middle part of the surface of the lower bottom plate; an annular permanent magnet is sleeved outside each magnetic conduction guide rod; the magnetorheological elastomer and the steel plate are both circular and are arranged between the two permanent magnets and the two magnetic conductive guide rods in an alternate overlapping mode; the lower ends of the vertical connecting rods are fixed at the outer side of the surface of the lower bottom plate at intervals along the circumferential direction, the upper ends of the vertical connecting rods are respectively provided with a universal hinge, and each universal hinge is positioned in a smooth sliding chute on the upper bottom plate; the steel cylinder is composed of a plurality of arc-shaped steel plates, and two side edges of each arc-shaped steel plate are respectively connected to two adjacent vertical connecting rods; the coil is tightly attached to the inner circumferential surface of the steel cylinder and is composed of wound insulated copper wires, two ends of the coil are connected with a direct current power supply, and gaps are reserved among the coil, the magnetorheological elastomer, the steel plate and the permanent magnet.
The magnetorheological elastomer is prepared by uniformly mixing carbonyl iron powder, 704 silicon rubber and dimethyl silicon oil to prepare a magnetorheological elastomer mixture, slowly pouring the mixture into a mold, standing until no bubbles exist, covering a top cover of the mold, then placing the mixture in a uniform high magnetic field, curing for 12 hours, and then demolding.
When the vertical load born by the support is large, the vertical connecting rod and the steel cylinder can be replaced by the steel cylinder with large wall thickness and integral structure, the top of the steel cylinder is provided with a universal hinge, and the smooth sliding groove on the upper bottom plate is arranged into a ring shape.
The upper bottom plate, the lower bottom plate, the steel plate, the vertical connecting rod, the steel cylinder and the magnetic guide rod are all made of materials with good magnetic conductivity, including silicon steel and low-carbon steel.
The permanent magnet is made of neodymium iron boron materials.
The magnetorheological elastomer intelligent shock-insulation support with high vertical bearing capacity can integrally form a closed magnetic circuit, and the size of a magnetic field generated by a permanent magnet can be changed by changing the size of current applied to a coil, so that the adjustable range of the rigidity of the magnetorheological elastomer can be expanded; the vertical connecting rod and the universal hinge are arranged in the support, so that vertical load can be borne, the deformation of the magnetorheological elastomer and the coil is reduced, the magnetorheological effect of the support and the stability of the coil are ensured, and the service life is prolonged; the support has the advantages of high safety, strong controllability and the like, and solves the problem that the conventional shock isolation device has poor shock absorption effect under the action of the short-fault long-period velocity and displacement pulse earthquake.
Drawings
FIG. 1 is a sectional view of an intelligent magnetorheological elastomer seismic isolation bearing with high vertical bearing capacity provided by the invention.
FIG. 2 is a plan view of an upper base plate in the magnetorheological elastomer intelligent vibration-isolating support with high vertical bearing capacity provided by the invention.
FIG. 3 is a cross section view of the magnetorheological elastomer intelligent vibration-isolating support with high vertical bearing capacity provided by the invention.
Detailed Description
The magnetorheological elastomer intelligent vibration-isolating support with high vertical bearing capacity provided by the invention is described in detail below by combining the attached drawings and specific embodiments.
As shown in fig. 1, 2 and 3, the intelligent magnetorheological elastomer vibration-isolating support with high vertical bearing capacity provided by the invention comprises an upper base plate 1, a lower base plate 2, a magnetorheological elastomer 3, a steel plate 4, a permanent magnet 5, a universal hinge 6, a vertical connecting rod 7, a steel cylinder 8, a coil 9 and a magnetic guide rod 10; wherein, a plurality of lower connecting bolt holes 12 are formed on the peripheral edge of the lower bottom plate 2 at intervals; the upper bottom plate 1 is horizontally arranged above the lower bottom plate 2, a plurality of smooth sliding grooves 13 are formed by inwards sinking the outer part of the bottom surface at intervals along the circumferential direction, and a plurality of upper connecting bolt holes 11 are formed at intervals of the peripheral edge; the upper end of one magnetic conduction guide rod 10 is connected with the middle part of the bottom surface of the upper bottom plate 1, and the lower end of the other magnetic conduction guide rod 10 is connected with the middle part of the surface of the lower bottom plate 2; an annular permanent magnet 5 is sleeved outside each magnetic conduction guide rod 10; the magnetorheological elastomer 3 and the steel plate 4 are both circular and are arranged between the two permanent magnets 5 and the two magnetic conducting guide rods 10 in an alternate overlapping mode; the lower ends of a plurality of vertical connecting rods 7 are fixed at the outer side of the surface of the lower bottom plate 2 at intervals along the circumferential direction, the upper ends of the vertical connecting rods are respectively provided with a universal hinge 6, and each universal hinge 6 is positioned in a smooth sliding groove 13 on the upper bottom plate 1; the steel cylinder 8 is composed of a plurality of arc-shaped steel plates, and two side edges of each arc-shaped steel plate are respectively connected to two adjacent vertical connecting rods 7; the coil 9 is tightly attached to the inner circumferential surface of the steel cylinder 8 and is composed of wound insulated copper wires, two ends of the coil are connected with a direct current power supply, and gaps are reserved among the coil 9, the magnetorheological elastomer 3, the steel plate 4 and the permanent magnet 5.
The magnetorheological elastomer 3 is prepared by uniformly mixing carbonyl iron powder, 704 silicon rubber and dimethyl silicon oil to prepare a magnetorheological elastomer mixture, slowly pouring the mixture into a mold, standing until no bubbles exist, covering a top cover of the mold, then placing the mixture in a uniform high magnetic field, curing for 12 hours, and then demolding.
When the vertical load born by the support is large, the vertical connecting rod 7 and the steel cylinder 8 can be replaced by the steel cylinder with large wall thickness and integral structure, the top of the steel cylinder is provided with the universal hinge 6, and meanwhile, the smooth sliding groove 13 on the upper bottom plate 1 is arranged into a ring shape.
The upper base plate 1, the lower base plate 2, the steel plate 4, the vertical connecting rod 7, the steel cylinder 8 and the magnetic guide rod 10 are all made of materials with good magnetic conductivity, including silicon steel and low-carbon steel.
The permanent magnet 5 is made of neodymium iron boron materials. The rubidium iron boron material has the characteristics of high dimensional precision, uniform and excellent magnetic performance and the like; assuming that the magnetic field intensity generated by the permanent magnet 5 is T0When the maximum current is introduced in the forward direction, the magnetorheological elastomer 3 reaches a magnetic saturation state, the shear stiffness of the support is the maximum, and when the maximum current is introduced in the reverse direction, the generated magnetic field intensity is-T0At the moment, the shear stiffness of the support is minimum; the size of the permanent magnet 5 should meet the upper limit requirement of the bearing capacity of the support, and the magnetic pole direction is determined according to the design requirement of the support and the directions of the positive electrode and the negative electrode of the direct-current power supply of the coil 9.
The installation and use method of the magnetorheological elastomer intelligent vibration-isolating support with high vertical bearing capacity provided by the invention is explained as follows:
the magnetorheological elastomer intelligent shock insulation support with high vertical bearing capacity provided by the invention can be applied to building structures or large-span space structures and the like. Firstly, the upper bottom plate 1 of the support is connected with a building structure or a large span space structure to be damped by bolts through upper connecting bolt holes 11 by workers, and the lower bottom plate 2 is connected with a foundation by bolts through lower connecting bolt holes 12.
When an earthquake occurs, the support can vibrate to enable the upper base plate 1 and the lower base plate 2 to generate relative displacement, in the process, the upper part of the universal hinge 6 horizontally and freely slides in two directions in the smooth sliding groove 13 of the upper base plate 1, and the friction coefficient is about 0.01-0.02. The support can form a closed magnetic circuit integrally, and the size of the magnetic field generated by the permanent magnet 5 can be changed by changing the current applied to the coil 9, so that the adjustable range of the rigidity of the magnetorheological elastomer 3 can be expanded. Because the support is provided with the vertical connecting rod 7 and the universal hinge 6, the support can bear vertical load so as to reduce the deformation of the magnetorheological elastomer 3 and the coil 9; the steel cylinder 8 can increase the buckling strength of the vertical connecting rod 7, and meanwhile, the coil 9 can be protected, so that the magneto-rheological effect of the magneto-rheological elastomer intelligent vibration isolation support and the stability of the coil 9 are guaranteed, the safety of the whole structure is improved, and the service life of the support is prolonged.
Claims (5)
1. The utility model provides a magnetic current becomes elastomer intelligence isolation bearing with high vertical bearing capacity which characterized in that: the magnetorheological elastomer intelligent shock insulation support with high vertical bearing capacity comprises an upper base plate (1), a lower base plate (2), a magnetorheological elastomer (3), a steel plate (4), a permanent magnet (5), a universal hinge (6), a vertical connecting rod (7), a steel cylinder (8), a coil (9) and a magnetic guide rod (10); wherein a plurality of lower connecting bolt holes (12) are formed at intervals on the peripheral edge of the lower bottom plate (2); the upper bottom plate (1) is horizontally arranged above the lower bottom plate (2), a plurality of smooth sliding grooves (13) are formed in the outer portion of the bottom surface in an inwards recessed mode along the circumferential distance, and a plurality of upper connecting bolt holes (11) are formed in the peripheral edge of the bottom surface at intervals; the upper end of one magnetic guide rod (10) is connected to the middle of the bottom surface of the upper bottom plate (1), and the lower end of the other magnetic guide rod (10) is connected to the middle of the surface of the lower bottom plate (2); an annular permanent magnet (5) is sleeved outside each magnetic conduction guide rod (10); the magnetorheological elastomer (3) and the steel plate (4) are both circular and are arranged between the two permanent magnets (5) and the two magnetic guide rods (10) in an alternate overlapping mode; the lower ends of the vertical connecting rods (7) are fixed at the outer side of the surface of the lower bottom plate (2) at intervals along the circumferential direction, the upper ends of the vertical connecting rods are respectively provided with a universal hinge (6), and each universal hinge (6) is positioned in a smooth sliding groove (13) on the upper bottom plate (1); the steel cylinder (8) is composed of a plurality of arc-shaped steel plates, and two side edges of each arc-shaped steel plate are respectively connected to two adjacent vertical connecting rods (7); the coil (9) is tightly attached to the inner circumferential surface of the steel cylinder (8) and is composed of wound insulated copper wires, two ends of the coil are connected with a direct current power supply, and gaps are reserved among the coil (9), the magnetorheological elastomer (3), the steel plate (4) and the permanent magnet (5).
2. The magnetorheological elastomer intelligent vibration-isolating support with the high vertical bearing capacity according to claim 1, wherein: the magnetorheological elastomer (3) is prepared by uniformly mixing carbonyl iron powder, 704 silicon rubber and dimethyl silicon oil to prepare a magnetorheological elastomer mixture, slowly pouring the mixture into a mold, standing until no bubbles exist, covering a top cover of the mold, then placing the mixture in a uniform high magnetic field, curing for 12 hours, and then demolding.
3. The magnetorheological elastomer intelligent vibration-isolating support with the high vertical bearing capacity according to claim 1, wherein: when the vertical load born by the support is large, the vertical connecting rod (7) and the steel cylinder (8) can be replaced by the steel cylinder with large wall thickness and an integral structure, a universal hinge (6) is arranged at the top of the steel cylinder, and meanwhile, a smooth sliding groove (13) on the upper bottom plate (1) is arranged into a ring shape.
4. The magnetorheological elastomer intelligent vibration-isolating support with the high vertical bearing capacity according to claim 1, wherein: the upper base plate (1), the lower base plate (2), the steel plate (4), the vertical connecting rod (7), the steel cylinder (8) and the magnetic conduction guide rod (10) are all made of silicon steel or low-carbon steel materials.
5. The magnetorheological elastomer intelligent vibration-isolating support with the high vertical bearing capacity according to claim 1, wherein: the permanent magnet (5) is made of neodymium iron boron materials.
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| CN202010837123.6A CN111946127B (en) | 2020-08-19 | 2020-08-19 | Magnetorheological elastomer intelligent shock insulation support with high vertical bearing capacity |
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| CN202010837123.6A CN111946127B (en) | 2020-08-19 | 2020-08-19 | Magnetorheological elastomer intelligent shock insulation support with high vertical bearing capacity |
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| CN111946127B true CN111946127B (en) | 2021-07-30 |
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| CN112943839B (en) * | 2021-02-09 | 2023-02-10 | 上海工程技术大学 | Magnetorheological elastomer shock absorber with adjustable working stroke |
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| JP4409742B2 (en) * | 2000-10-05 | 2010-02-03 | 株式会社東芝 | Variable spring type damping device |
| CN101586641B (en) * | 2009-06-23 | 2010-11-03 | 武汉理工大学 | Laminated intelligent shock-isolation bearing capable of self-adaptively regulating cutting performance |
| CN102733483A (en) * | 2012-07-02 | 2012-10-17 | 大连理工大学 | Variable rigidity shock insulation integral intelligent support seat |
| CN107013073B (en) * | 2017-03-24 | 2019-05-31 | 南京理工大学 | Composite-structure magnetorheological elastomer isolator |
| CN109295844A (en) * | 2018-10-30 | 2019-02-01 | 扬州大学 | A kind of magnetorheological high damping elastomer single support of laminated type |
| CN109972667B (en) * | 2019-03-20 | 2020-09-25 | 南京理工大学 | Composite-structure magnetorheological elastomer negative-stiffness shock isolator |
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Inventor after: Lv Yang Inventor after: Zhang Yike Inventor after: Mei Pinbin Inventor after: Huijiantong Inventor after: Chen Yu Inventor after: Huang Xin Inventor after: Zhang Huidong Inventor before: Lv Yang Inventor before: Zhang Yike Inventor before: Mei Pinbin Inventor before: Huijiantong Inventor before: Chen Yu Inventor before: Huang Xin |
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