CN111350291B - Variable-damping variable-rigidity viscoelastic-friction composite damper - Google Patents
Variable-damping variable-rigidity viscoelastic-friction composite damper Download PDFInfo
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- CN111350291B CN111350291B CN202010209364.6A CN202010209364A CN111350291B CN 111350291 B CN111350291 B CN 111350291B CN 202010209364 A CN202010209364 A CN 202010209364A CN 111350291 B CN111350291 B CN 111350291B
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- 238000013016 damping Methods 0.000 title claims abstract description 38
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 193
- 239000010959 steel Substances 0.000 claims abstract description 193
- 239000003190 viscoelastic substance Substances 0.000 claims abstract description 44
- 238000004873 anchoring Methods 0.000 claims abstract description 23
- 238000004073 vulcanization Methods 0.000 claims description 6
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 description 15
- 238000001125 extrusion Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000005284 excitation Effects 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 230000035939 shock Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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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- 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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- Vibration Prevention Devices (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Vibration Dampers (AREA)
Abstract
The invention discloses a variable-damping variable-stiffness viscoelastic-friction composite damper which comprises two symmetrical cylindrical viscoelastic damper units and two cylindrical friction damper units, wherein the friction damper units are sleeved on the outer sides of the cylindrical viscoelastic damper units. The cylinder type viscoelastic damper unit comprises an annular inner steel cylinder, an annular viscoelastic material layer and an annular middle steel cylinder from inside to outside in sequence, wherein an elastic element is sleeved in the middle of the annular inner steel cylinder, sealing steel plates are arranged at two ends of the annular inner steel cylinder, cylindrical viscoelastic materials are arranged on the inner sides of two end parts of the annular middle steel cylinder, and connecting and anchoring steel plates are arranged at two ends of the annular middle steel cylinder; the friction damper unit is sequentially provided with an annular middle steel cylinder, an annular friction plate and an annular outer steel cylinder from inside to outside, the annular friction plate is divided into a first annular friction plate and a second annular friction plate, and the annular outer steel cylinder is formed by assembling and connecting an upper semi-annular outer steel cylinder and a lower semi-annular outer steel cylinder through bolts.
Description
Technical Field
The invention relates to a damper, in particular to a variable-damping variable-rigidity viscoelastic-friction composite damper, belonging to the technical field of energy dissipation and shock absorption.
Background
Viscoelastic dampers and friction dampers are the most commonly used dampers in civil engineering. The traditional viscoelastic damper is suitable for resisting wind vibration and small vibration, can start to consume energy under small displacement, and has good fatigue performance and energy consumption performance. The traditional friction damper can only provide constant friction force, the damping force can not obviously change along with the increase of the displacement, the traditional friction damper does not have the characteristic of providing different damping forces under the different earthquake excitations of wind vibration, small vibration, middle vibration and large vibration, and the phenomenon of abrasion fatigue under the action of the small displacement (wind vibration and small vibration) for a plurality of times for a long time is serious. When the sliding force value of the friction damper is set to be too high, the damping can not slide or the sliding displacement is too small, so that a good energy consumption effect cannot be exerted; when the slip force value is set to be too low, the damping force provided under the conditions of medium and large earthquakes is too small, and the required energy consumption capability cannot be met. Therefore, the friction variable coefficient and the method for adjusting the pretightening force are adopted to realize that different excitations and different stages provide different resistances, and the advantages of the viscoelastic damper are combined, so that the development of the variable damping variable stiffness viscoelastic-friction composite damper is necessary.
Disclosure of Invention
The invention aims to solve the problems of the existing friction damper, and provides a variable-damping variable-stiffness viscoelastic-friction composite damper which has the technical advantages of a viscoelastic damper and a variable-coefficient friction damper, can effectively reduce the vibration response of a structure under small earthquake and wind vibration, can enable the damper to generate good energy consumption capacity under medium earthquake and large earthquake, and has the advantage of good fatigue performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a variable damping variable stiffness viscoelasticity-friction composite damper is of a symmetrical structure integrally and comprises two cylinder type viscoelasticity damper units and two cylinder type friction damper units, wherein the two cylinder type viscoelasticity damper units are symmetrically and oppositely connected, and the two friction damper units are correspondingly sleeved outside the two cylinder type viscoelasticity damper units respectively; wherein,
the cylindrical viscoelastic damper unit is characterized in that all parts are coaxially arranged and sequentially provided with an annular inner steel cylinder, an annular viscoelastic material layer and an annular middle steel cylinder from inside to outside, an elastic element is sleeved outside the middle section of the annular inner steel cylinder, the annular middle steel cylinder is divided into a left annular middle steel cylinder and a right annular middle steel cylinder which are respectively sleeved on the left section and the right section of the annular inner steel cylinder and connected with the elastic element, and the annular viscoelastic material layer is filled among the left annular middle steel cylinder, the right annular middle steel cylinder and the annular inner steel cylinder; the two ends of the annular middle steel cylinder far away from the two ends are respectively connected with a connecting anchoring steel plate;
the friction damper unit is characterized in that all parts of the friction damper unit are coaxially arranged and sequentially comprise an annular middle steel cylinder, an annular friction plate and an annular outer steel cylinder from inside to outside, the outer steel cylinder is sleeved outside the annular middle steel cylinder, the annular friction plate is sleeved on the annular middle steel cylinder, the annular friction plate is attached to a groove in the inner wall of the annular outer steel cylinder, and the annular friction plate is in friction contact with the annular friction plate.
Further, the annular friction plate is divided into a first annular friction plate and a second annular friction plate, the first annular friction plate has a smaller friction coefficient, and the second annular friction plate has a larger friction coefficient.
Furthermore, a plurality of annular fixing grooves are formed in the outer surface of the annular middle steel cylinder at equal intervals, the size of each annular fixing groove is matched with that of each annular friction plate, and the depth of each annular fixing groove is 5-20 mm.
Furthermore, the annular outer steel cylinder is formed by assembling and connecting an upper semicircular outer steel cylinder and a lower semicircular outer steel cylinder by bolts, the first annular friction plate is formed by a first upper semicircular friction plate and a first lower semicircular friction plate, and the first upper semicircular friction plate and the first lower semicircular friction plate are correspondingly attached to inner wall annular grooves of the upper semicircular outer steel cylinder and the lower semicircular outer steel cylinder respectively; the second annular friction plate consists of a second upper semicircular friction plate and a second lower semicircular friction plate, the second upper semicircular friction plate and the second lower semicircular friction plate are correspondingly attached to inner wall annular grooves of the upper semicircular outer steel cylinder and the lower semicircular outer steel cylinder respectively, and viscoelastic compressible gaskets are arranged between the upper semicircular outer steel cylinder, the lower semicircular outer steel cylinder, the first upper semicircular friction plate, the first lower semicircular friction plate and between the second upper semicircular friction plate and the second lower semicircular friction plate.
Furthermore, the steel cylinder keeps away from both ends mutually in the annular and is equipped with left sealed steel sheet and right sealed steel sheet, steel cylinder keeps away from both ends mutually in the steel cylinder and the right annular in the left side annular and is provided with cylinder viscoelastic material.
Preferably, the distance between the left annular middle steel cylinder and the right annular middle steel cylinder is 80-180 mm.
Further, the annular inner steel cylinder, the annular middle steel cylinder and the annular viscoelastic material layer are connected in a high-temperature high-pressure vulcanization mode or an adhesion mode.
Further, the annular middle steel cylinder is connected with the cylinder viscoelastic material inside the annular middle steel cylinder in a high-temperature high-pressure vulcanization mode or an adhesion mode.
Preferably, the connection and anchoring steel plate is divided into a left connection and anchoring steel plate and a right connection and anchoring steel plate, the spacing distance between the left end surface of the annular outer steel cylinder and the left connection and anchoring steel plate is 200-400 mm, and the spacing distance between the right end surface of the annular outer steel cylinder and the right connection and anchoring steel plate is 200-400 mm.
Preferably, the elastic element is a high-strength spring, the annular viscoelastic material layer and the cylindrical viscoelastic material layer are both made of a high-damping ternary isopropyl rubber composite material or a high-damping silicone rubber composite material, the annular friction plate is a high-wear-resistance steel friction plate, the first annular friction plate is a polytetrafluoroethylene plate, and the second annular friction plate is a brass plate.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the composite damper has the technical advantages of both the viscoelastic damper and the variable coefficient friction damper, and under the action of small vibration or wind vibration, the viscoelastic damper starts to work to consume energy and bears most of energy consumption, and the energy consumption performance and the fatigue performance are good; under the action of medium and large earthquakes, the viscoelastic damper and the friction damper work simultaneously to dissipate earthquake energy together, so that the dissipation capacity of the damper is obviously improved, the damper can effectively reduce the vibration response of the structure under the small earthquakes and the wind earthquakes, the damper can generate better energy dissipation capacity under the medium earthquakes and the large earthquakes, meanwhile, under the action of the small earthquakes or the wind earthquakes, the friction damper is prevented from being worn and fatigued to cause the failure of the whole damper, the service life of the whole damper is greatly prolonged, and under the action of the medium earthquakes and the large earthquakes, the limiting function of the damper prevents the viscoelastic material from being sheared and damaged; the composite damper can play a good role in damping the vibration of the structure under small vibration, wind vibration, medium vibration and large vibration.
The damping force adjusting device has the technical advantages of capability of better adjusting damping performance under different excitations, and meets the requirements of damping force (rigidity and damping) by adjusting the materials and the sizes of the annular friction plate and the friction plate and adjusting the size of pretightening force according to the requirements of the required damping force performance. The high-strength elastic element arranged in the middle of the annular inner steel cylinder can provide larger elastic restoring rigidity when being pressed and pulled, so that the deformation resistance of the whole damper is improved, and the damper has a self-resetting function; the extrusion deformation of the cylinder viscoelastic material at the end part of the middle steel cylinder not only provides the extrusion energy consumption function, but also provides larger rigidity to play a limiting role, and ensures that the annular viscoelastic material layer between the inner cylinder and the middle cylinder is not damaged by shearing. The edges of each viscoelastic material layer are well constrained, so that the fatigue resistance of the viscoelastic material layer is good; the friction damper units are connected in an assembly mode, and the friction damper units are guaranteed to have the advantages that friction plates are easy to replace, the unit utilization rate is high, and the like.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a sectional view taken along A-A of the annular inner steel cylinder, the annular viscoelastic layer, the annular left middle steel cylinder, the annular second friction plate and the annular outer steel cylinder in FIG. 1;
FIG. 3 is a cross-sectional view taken along the direction B-B of the annular inner steel cylinder, the annular viscoelastic layer, the annular right middle steel cylinder, the first annular friction plate and the annular outer steel cylinder in FIG. 1;
FIG. 4 is a cross-sectional view of the viscoelastic material C-C of the annular right middle steel cylinder and the cylinder in FIG. 1;
FIG. 5 is a schematic structural view of the connecting and anchoring steel plate according to the present invention;
in the figure: 1 elastic element, 2 annular inner steel cylinders, 3-1 left annular viscoelastic material layer, 3-2 right annular viscoelastic material layer, 4-1 left annular middle steel cylinder, 4-2 right annular middle steel cylinder, 5-1 left annular friction plate, 5-2 right annular friction plate, 6-1 first upper semi-annular friction plate, 6-2 first lower semi-annular friction plate, 7-1 second upper semi-annular friction plate, 7-2 second lower semi-annular friction plate, 8-1 upper semi-annular steel cylinder, 8-2 lower semi-annular steel cylinder, 9-1 left sealing steel plate, 9-2 right sealing steel plate, 10-1 left viscoelastic material, 10-2 right cylinder viscoelastic material, 11-1 left connecting anchoring steel plate, 11-2 right connecting anchoring steel plate, 12-1 left perforated connecting piece, 12-2 right perforated connecting piece, 13 high-strength bolt and 14 viscoelastic compressible gasket.
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.
In the following, reference is made to fig. 1 to 5:
the invention relates to a variable damping and variable stiffness viscoelastic-friction composite damper, the whole damper is of a symmetrical structure and comprises two cylinder type viscoelastic damper units and two cylinder type friction damper units, the two cylinder type viscoelastic damper units are symmetrically and oppositely connected, the two friction damper units are respectively and correspondingly sleeved at the outer sides of the two cylinder type viscoelastic damper units, wherein,
the cylindrical viscoelastic damper unit is characterized in that all parts are coaxially arranged and sequentially comprise an annular inner steel cylinder 2, an annular viscoelastic material layer 3 and an annular middle steel cylinder 4 from inside to outside, the annular inner steel cylinder 2 is divided into a left section, a middle section and a right section, the annular middle steel cylinder 4 is divided into a left annular middle steel cylinder 4-1 and a right annular middle steel cylinder 4-2, the left annular middle steel cylinder 4-1 and the right annular middle steel cylinder 4-2 are sleeved on the left section and the right section of the annular inner steel cylinder 2 at a certain distance, and the preferable distance is 80-180 mm. An annular viscoelastic material layer 3 is filled between the annular inner steel cylinder 2 and the left annular middle steel cylinder 4-1 and the right annular middle steel cylinder 4-2, and the annular inner steel cylinder 2 is connected with the left annular middle steel cylinder 4-1, the right annular middle steel cylinder 4-2 and the annular viscoelastic material layer 3 in a high-temperature and high-pressure vulcanization mode or an adhesive mode, so that the integrity of the annular inner steel cylinder 2 and the left annular middle steel cylinder 4-1 is ensured, and the annular inner steel cylinder 4-2 and the annular viscoelastic material layer 3 are prevented from being separated from each other during vibration. The middle section of the annular inner steel cylinder 2 is sleeved with an elastic element 1, two ends of the elastic element 1 are fixedly connected with the left annular middle steel cylinder 4-1 and the right annular middle steel cylinder 4-2 respectively, and preferably, the elastic element 1 is a high-strength spring to ensure the extrusion and stretching resistance of the elastic element. The two ends of the annular inner steel cylinder 2 are provided with a left sealing steel plate 9-1 and a right sealing steel plate 9-2, under the action of a large shock, the sealing plates can be uniformly contacted with the cylindrical viscoelastic material 10 to generate extrusion deformation energy consumption, meanwhile, the cylindrical viscoelastic material provides large rigidity to play a limiting role, the annular viscoelastic material layer 3 is prevented from being subjected to large displacement shearing damage, the cylindrical viscoelastic material 10 is arranged in the two mutually far ends of the annular middle steel cylinder 4, the annular middle steel cylinder 4 and the cylindrical viscoelastic material 10 are connected in a high-temperature high-pressure vulcanization mode or a high-strength adhesive bonding mode, the cylindrical viscoelastic material 10 not only provides the extrusion energy consumption function during extrusion deformation, but also provides the large rigidity to play the limiting role, and the annular viscoelastic material layer 3 between the annular inner cylinder 2 and the annular middle cylinder 4 is guaranteed not to be sheared and damaged. The outer end part of the left annular middle steel cylinder 4-1 is provided with a left connecting and anchoring steel plate 11-1, the outer end part of the right annular middle steel cylinder 4-2 is provided with a right connecting and anchoring steel plate 11-2, the annular middle steel cylinder 4 is fixedly connected with the connecting and anchoring steel plate 11 in a welding manner, the outer side of the connecting and anchoring steel plate 11 is provided with a perforated connecting piece, the connecting and anchoring steel plate 11 is fixedly connected with a perforated connecting piece 12 in a welding manner, and the shockproof steel cylinder can be fixed at a place, needing shockproof, of a building through the perforated connecting piece 12.
All parts of the friction damper unit are coaxially arranged and sequentially comprise an annular middle steel cylinder 4, an annular friction plate 5, a first annular friction plate 6, a second annular friction plate 7 and an annular outer steel cylinder 8 from inside to outside. The annular outer steel cylinder 8 is sleeved outside the annular middle steel cylinder 4, and an annular friction plate 5 and an annular friction plate 6 are arranged between the annular outer steel cylinder and the annular middle steel cylinder. A plurality of annular fixing grooves are formed in the outer wall of the annular middle steel cylinder 4 at equal intervals, and the annular friction plates 5 are sleeved in the fixing grooves and then fixed on the outer wall of the annular middle steel cylinder 4. The annular friction plates are divided into a first annular friction plate 6 and a second annular friction plate 7, the first annular friction plate 6 consists of a first upper semicircular friction plate 6-1 and a first lower semicircular friction plate 6-2, and the first upper semicircular friction plate 6-1 and the first lower semicircular friction plate 6-2 are correspondingly attached to the inner wall grooves of the upper semicircular outer steel cylinder 8-1 and the lower semicircular outer steel cylinder 8-2 respectively; the second annular friction plate 7 consists of a second upper semicircular friction plate 7-1 and a second lower semicircular friction plate 7-2, the second upper semicircular friction plate 7-1 and the second lower semicircular friction plate 7-2 are correspondingly attached to the inner wall grooves of the upper semicircular outer steel cylinder 8-1 and the lower semicircular outer steel cylinder 8-2 respectively, and viscoelastic compressible gaskets 14 are arranged between the upper semicircular outer steel cylinder 8-1 and the lower semicircular outer steel cylinder 8-2, the first upper semicircular friction plate 6-1 and the first lower semicircular friction plate 6-2, the second upper semicircular friction plate 7-1 and the second lower semicircular friction plate 7-2; the depth of the annular groove on the inner wall is 5 mm-20 mm. ) The annular friction plates are divided into a first annular friction plate 6 and a second annular friction plate 7, wherein the friction coefficient of the first annular friction plate 6 is small, the friction coefficient of the second annular friction plate 7 is large, and when the sliding force value of the friction damper is set to be too high, the damping can be unsliding or the sliding displacement is too small to play a good energy consumption role; when the slip force value is set to be too low, the damping force provided under the conditions of medium and large earthquakes is too small, and the required energy consumption capability cannot be met. Therefore, different excitations and different stages of providing different resistances are realized by adopting a friction coefficient and a method for adjusting the pretightening force, preferably, the first annular friction plate 6 is a polytetrafluoroethylene plate, the second annular friction plate 7 is a brass plate, and the annular friction plate 5 is a high-wear-resistance steel friction plate.
The annular outer steel cylinder 8 is formed by assembling and connecting an upper semi-annular outer steel cylinder 8-1 and a lower semi-annular outer steel cylinder 8-2 through high-strength bolts 13, a viscoelastic compressible gasket 14 is arranged between the upper semi-annular outer steel cylinder 8-1 and the lower semi-annular outer steel cylinder 8-2, the viscoelastic compressible gasket 14 is provided with holes matched with the high-strength bolts 13, and the viscoelastic compressible gasket can be adjusted through the high-strength bolts 13 according to the required pre-tightening force.
The spacing distance between the left end face of the annular outer steel cylinder 8 and the left connecting and anchoring steel plate 11-1 is 200 mm-400 mm, and the spacing distance between the right end face of the annular outer steel cylinder 8 and the right connecting and anchoring steel plate 11-2 is 200 mm-400 mm.
Preferably, the annular viscoelastic material layer 3 and the cylindrical viscoelastic material 10 are both high-damping ternary isopropyl rubber composite materials or high-damping silicone rubber composite materials.
When in use: the variable damping variable stiffness viscoelasticity-friction composite damper is arranged between building structure layers by adopting a herringbone support, an armpit support or a diagonal bracing.
Under the conditions of small earthquake and wind vibration, the annular viscoelastic material layer 3 between the annular inner steel cylinder 2 and the annular middle steel cylinder 4 is sheared and deformed to play most of energy consumption role, and the annular friction plate 5 and the first annular friction plate 6 are relatively rubbed to play a small part of energy consumption role.
In the middle earthquake, the annular viscoelastic material 3 layer between the annular inner steel cylinder 2 and the annular middle steel cylinder 4 generates shearing deformation, and the annular friction plate 5, the first annular friction plate 6 and the second annular friction plate 7 slide and rub relatively to consume energy together, so that the energy consumption capability is greatly improved.
Under the condition of heavy shock, the annular viscoelastic material layer 3 between the annular inner steel cylinder 2 and the annular middle steel cylinder 4 generates shearing deformation, the annular friction plate 5 and the first annular friction plate 6 and the second annular friction plate 7 perform relative sliding friction, and the cylindrical viscoelastic material 10 performs extrusion deformation to jointly consume energy, so that the energy consumption capacity is greatly improved, a larger rigidity is provided to play a limiting role, and the annular viscoelastic material layer between the annular inner steel cylinder 2 and the annular middle steel cylinder 4 is ensured not to be sheared and damaged.
In addition, the high-strength elastic element 1 arranged in the middle of the annular inner steel cylinder 2 can provide large elastic restoring rigidity when being pressed and pulled, so that the deformation resistance of the whole damper is improved, and the damper has a self-resetting function.
According to the requirement of the required damping force performance, the requirements of rigidity and damping can be met by adjusting the friction coefficients and the sizes of the annular friction plates 6 and 7 and adjusting the pre-tightening force through the high-strength bolt 13.
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 (9)
1. A variable damping and variable stiffness viscoelastic-friction composite damper is characterized in that: the whole structure is a symmetrical structure and comprises two cylindrical viscoelastic damper units and two cylindrical friction damper units, wherein the two cylindrical viscoelastic damper units are symmetrically and oppositely connected, and the two friction damper units are respectively sleeved outside the two cylindrical viscoelastic damper units correspondingly; wherein,
the cylindrical viscoelastic damper unit is characterized in that all parts are coaxially arranged and sequentially provided with an annular inner steel cylinder, an annular viscoelastic material layer and an annular middle steel cylinder from inside to outside, an elastic element is sleeved outside the middle section of the annular inner steel cylinder, the annular middle steel cylinder is divided into a left annular middle steel cylinder and a right annular middle steel cylinder which are respectively sleeved on the left section and the right section of the annular inner steel cylinder and connected with the elastic element, and the annular viscoelastic material layer is filled among the left annular middle steel cylinder, the right annular middle steel cylinder and the annular inner steel cylinder; the two ends of the annular middle steel cylinder far away from the two ends are respectively connected with a connecting anchoring steel plate;
the friction damper unit is characterized in that all parts of the friction damper unit are coaxially arranged and sequentially comprise an annular middle steel cylinder, an annular friction plate and an annular outer steel cylinder from inside to outside, the outer steel cylinder is sleeved outside the annular middle steel cylinder, the annular friction plate is sleeved on the annular middle steel cylinder, the annular friction plate is divided into a first annular friction plate and a second annular friction plate which have different friction coefficients and are respectively attached to grooves in the inner wall of the annular outer steel cylinder, and the annular friction plate is in friction contact with the annular friction plate.
2. The variable damping and stiffness viscoelastic-friction composite damper as claimed in claim 1, wherein: the first annular friction plate has a relatively low coefficient of friction and the second annular friction plate has a relatively high coefficient of friction.
3. The variable damping and stiffness viscoelastic-friction composite damper as claimed in claim 2, wherein: the steel cylinder keeps away from both ends mutually in the annular and is equipped with left side and seals steel sheet and right side and seal the steel sheet, steel cylinder keeps away from both ends inside with the right side annular in the steel cylinder in the left side annular mutually and is provided with cylinder viscoelastic material, steel cylinder passes through high temperature high pressure vulcanization mode or sticky mode with its inside cylinder viscoelastic material in the annular and is connected.
4. The variable damping and stiffness viscoelastic-friction composite damper as claimed in claim 3, wherein: the outer surface of the annular middle steel cylinder is provided with a plurality of annular fixing grooves at equal intervals, the size of each annular fixing groove is matched with that of each annular friction plate, and the depth of each annular fixing groove is 5-20 mm.
5. The variable damping and stiffness viscoelastic-friction composite damper as claimed in claim 4, wherein: the annular outer steel cylinder is formed by assembling and connecting an upper semicircular outer steel cylinder and a lower semicircular outer steel cylinder by bolts, the first annular friction plate is formed by a first upper semicircular friction plate and a first lower semicircular friction plate, and the first upper semicircular friction plate and the first lower semicircular friction plate are correspondingly attached to annular grooves in inner walls of the upper semicircular outer steel cylinder and the lower semicircular outer steel cylinder respectively; the second annular friction plate consists of a second upper semicircular friction plate and a second lower semicircular friction plate, the second upper semicircular friction plate and the second lower semicircular friction plate are correspondingly attached to inner wall annular grooves of the upper semicircular outer steel cylinder and the lower semicircular outer steel cylinder respectively, and viscoelastic compressible gaskets are arranged between the upper semicircular outer steel cylinder, the lower semicircular outer steel cylinder, the first upper semicircular friction plate, the first lower semicircular friction plate and between the second upper semicircular friction plate and the second lower semicircular friction plate.
6. The variable damping and stiffness viscoelastic-friction composite damper as claimed in claim 5, wherein: the distance between the left annular middle steel cylinder and the right annular middle steel cylinder is 80-180 mm.
7. The variable damping and stiffness viscoelastic-friction composite damper as claimed in claim 6, wherein: the annular inner steel cylinder, the annular middle steel cylinder and the annular viscoelastic material layer are connected in a high-temperature high-pressure vulcanization mode or an adhesion mode.
8. The variable damping and stiffness viscoelastic-friction composite damper as claimed in claim 7, wherein: the connection anchoring steel plate is divided into a left connection anchoring steel plate and a right connection anchoring steel plate, the spacing distance between the left end face of the annular outer steel cylinder and the left connection anchoring steel plate is 200-400 mm, and the spacing distance between the right end face of the annular outer steel cylinder and the right connection anchoring steel plate is 200-400 mm.
9. The variable damping and stiffness viscoelastic-friction composite damper as claimed in claim 8, wherein: the elastic element is a high-strength spring, the annular viscoelastic material layer and the cylindrical viscoelastic material layer are both made of high-damping ternary isopropyl rubber composite materials or high-damping silicon rubber composite materials, the annular friction plate is a high-wear-resistance steel friction plate, the first annular friction plate is a polytetrafluoroethylene plate, and the second annular friction plate is a brass plate.
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| CN202010209364.6A CN111350291B (en) | 2020-03-23 | 2020-03-23 | Variable-damping variable-rigidity viscoelastic-friction composite damper |
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| CN111962701B (en) * | 2020-08-14 | 2021-09-21 | 中交鹭建有限公司 | Self-resetting lead friction-viscoelasticity composite damper and working method thereof |
| CN112922182B (en) * | 2021-01-28 | 2022-04-19 | 武汉工程大学 | Self-resetting variable-damping variable-rigidity viscoelastic and friction composite damper |
| CN113309809B (en) * | 2021-04-13 | 2022-04-05 | 中国电力科学研究院有限公司 | Damping device and design method thereof |
| CN113882544B (en) * | 2021-10-19 | 2022-11-18 | 湖北文理学院 | Spatial multidirectional viscoelastic-shape memory alloy damping system |
| CN114645580B (en) * | 2022-04-16 | 2023-07-18 | 北京工业大学 | Self-resetting rigidity-changing friction damping device based on permanent magnet repulsive force |
| CN116164068A (en) * | 2023-04-26 | 2023-05-26 | 江苏佳力得新材料科技有限公司 | Self-resetting composite type variable friction damper and use method thereof |
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