CN115163716A - Viscous damper with variable friction damping - Google Patents
Viscous damper with variable friction damping Download PDFInfo
- Publication number
- CN115163716A CN115163716A CN202210805252.6A CN202210805252A CN115163716A CN 115163716 A CN115163716 A CN 115163716A CN 202210805252 A CN202210805252 A CN 202210805252A CN 115163716 A CN115163716 A CN 115163716A
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- Prior art keywords
- damping
- friction
- wall
- variable friction
- bush
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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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
- F16F7/09—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other in dampers of the cylinder-and-piston type
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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
- F16F9/30—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium
- F16F9/303—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium the damper being of the telescopic type
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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
- F16F2224/00—Materials; Material properties
- F16F2224/04—Fluids
- F16F2224/048—High viscosity, semi-solid pastiness
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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
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
- F16F2228/066—Variable stiffness
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
The invention provides a variable friction damping viscous damper, which comprises a cylinder body, wherein the cylinder body comprises a first lining and a second lining, the outer wall of the first lining extends into the inner wall of the second lining to form a cylinder body with a closed inner part, the first lining is filled with viscous damping materials, a piston rod is fixed in the second lining, a piston is fixed on the piston rod, a plurality of damping holes are formed in the piston, a gap is formed between the piston and the inner wall of the first lining, and a variable friction material layer is arranged on the inner wall of the second lining. According to the invention, viscous damping force is generated by flowing of viscous damping material in the cylinder barrel, variable friction damping force can be provided by the friction material on the inner wall of the second bushing, the space which is originally required for installing the variable friction damper and the viscous damper can be saved by only one damper, the damping effect of the structure is improved by using less space, and the purpose of providing viscous damping and frictional damping by using one damper and optimizing the damping can be achieved.
Description
Technical Field
The invention relates to the technical field of damping equipment, in particular to a viscous damper with variable friction damping.
Background
The viscous damper is a common damping device and has the advantages of no additional rigidity, simplicity in assembly and multiple application scenes. The equivalent additional damping ratio added for the structure has the characteristics of easy calculation and obvious effect. The structure is added at a plurality of positions simultaneously, so that the damping and energy dissipation capacity of the structure to wind and earthquake environmental loads can be effectively improved. The viscous damper generates damping force related to the movement speed through the viscous damping material in the cylinder tube flowing through the piston during the movement. At the initial stage of an earthquake, the viscous damper at a lower velocity cannot provide sufficient damping force. Meanwhile, the viscous damper has inevitable constant friction, which causes the viscous damper to have hard-to-overcome static friction force when subjected to smaller environmental load, so that the viscous damper cannot effectively absorb energy and even amplify structural response.
Disclosure of Invention
The invention aims to provide a viscous damper with variable friction damping, which has the capability of simultaneously providing displacement type damping force and speed type damping force and the self-adaptive damping and energy consumption effects.
According to one object of the invention, the viscous damper with variable friction damping comprises a cylinder body, wherein the cylinder body comprises a first lining and a second lining, the outer wall of the first lining extends into the inner wall of the second lining to form the cylinder body with the inner part being closed, viscous damping materials are filled in the first lining, a piston rod is fixed in the second lining, a piston is fixed on the piston rod, a plurality of damping holes are formed in the piston, a gap is formed between the piston and the inner wall of the first lining, and a variable friction material layer is arranged on the inner wall of the second lining.
Further, pin heads are respectively fixed to the end heads of the first bushing and the second bushing.
Further, the cylinder body is a horizontally arranged centrosymmetric cylinder body structure.
Further, the first bushing outer wall is in sliding connection with the second bushing, and the first bushing is in frictional connection with the variable friction material layer.
Further, the two ends formed by the first bushing and the second bushing are sealed by a circular sealing ring and an annular sealing ring to the viscous damping material.
Furthermore, air holes are reserved at the end part of the second bushing.
Further, the number of the pistons is one or more.
Further, the friction-changing material layer is made of polytetrafluoroethylene.
Further, the friction-changing material layer includes a plurality of friction layers arranged along the axial direction of the second bush, and the friction coefficients of the plurality of friction layers gradually increase from the outer side to the inner side of the second bush.
Furthermore, the inner side of the inner wall of the second bushing is provided with the friction materials with three friction coefficients, and the three friction materials are distributed on the inner wall of the second bushing according to the length.
According to the technical scheme, viscous damping force is generated by flowing of viscous damping material in the cylinder barrel, variable friction damping force can be provided by the friction material on the inner wall of the second bushing, the space which is originally required for installing the variable friction damper and the viscous damper can be saved by only one damper, and the damping (vibration) effect of the structure is improved by using less space. By reasonably arranging the arrangement range of different friction layer materials, the defect that the speed type viscous damper is insensitive to response at a low speed in the initial vibration stage is overcome, and the purpose of providing viscous damping and frictional damping by using one damper and optimizing the damping can be achieved. The limit type damping device breaks through the limitation of the traditional viscous damper for the structure, and can provide stable and continuous damping energy dissipation effect for the structure under different environmental loads.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic cross-sectional view of a damper according to an embodiment of the present invention.
FIG. 2 is a graphical representation of the frictional force provided by a damper in accordance with an embodiment of the present invention;
the damping device comprises a pin head 1, a pin head 2, a circular sealing ring 3, a viscous damping material 4, a first lining, a second lining, a variable friction material layer 6, a piston 7, a piston 8, a damping hole 9, a piston rod 10, an annular sealing ring 11 and air holes.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1-2, a viscous damper with variable friction damping, the viscous damper with variable friction damping of this embodiment is a horizontally arranged centrosymmetric tube structure, including a cylinder body, the cylinder body includes a first bush 4 and a second bush 5, the outer wall of the first bush 4 is adapted to the inner wall of the second bush 5 in size so that the first bush 4 and the second bush 5 can be tightly connected, the outer wall of the first bush 4 extends into the inner wall of the second bush 5 to form an inner closed cylinder body, two ends of the cylinder body formed by the first bush 4 and the second bush 5 are sealed by a circular sealing ring 2 and an annular sealing ring 10, the cylinder body is filled with viscous damping material 3, and the viscous damping material 3 is sealed by the circular sealing ring 2 and the annular sealing ring 10.
The end heads of the first lining 4 and the second lining 5 are respectively fixed with a pin head 1, and the end part of the second lining 5 is provided with a breather hole 11 so that the atmospheric pressure inside and outside the second lining 5 is balanced in the cylinder movement process. A piston rod 9 is fixed inside the second bush 5, a piston 7 is fixed on the piston rod 9, a plurality of damping holes 8 are formed in the piston 7, and a gap is kept between the piston 7 and the inner wall of the first bush 4, so that the viscous damping material 3 can flow through the piston 7 in the movement process, and along with the movement of the piston 7, the viscous damping material 3 passes through the piston 7 from a high-pressure-value area to a low-pressure-value area and generates damping force related to speed. In the case of one piston 7 in fig. 1, it is also possible to provide a plurality of pistons 7 as needed, or to use a viscous damping material having a different exponential relationship with the velocity, and the viscous damping material 3 applies a fluid pressure difference to the piston 7 along with the movement of the damper and generates a velocity-dependent damping force.
The inner walls of the first bush 4 and the second bush 5 are connected and generate variable friction damping force along with displacement. The variable friction damping force has the characteristic of increasing along with the increase of the displacement, and can present the linear and nonlinear variable friction damping effect with the displacement of the damper according to the design. Such as a variable friction material layer 6 disposed on the inner wall of the second bush 5, the variable friction material layer 6 being located between the first bush 4 and the second bush 5, the variable friction material layer 6 being made of a friction material having a stable coefficient of friction such as teflon, and the variable friction material layer 6 being disposed on the inner wall of the second bush 5.
The present embodiment provides the variable friction damping force and the viscous damping force by the viscous damping material 3 and the friction-varying material layer 6 on the sliding surface, respectively. The friction-changing material layer 6 includes a plurality of friction layers having a friction coefficient gradually increasing from the outer side to the inner side of the second bush 5 in the axial direction of the second bush 5, that is, the friction coefficient of the friction layer on the inner side of the inner wall of the second bush 5 is larger than that of the friction layer on the outer side. In this example, the number of the variable friction layers inside the inner wall of the second liner 5 is three, representing three friction coefficients. Each variable coefficient of friction material is distributed in length within the inner wall of the second liner 5 when viewed in cross-section. It should be noted that the arrangement of the layers of friction-changing material 6 may be selected to be offset or equally arranged according to the specific requirements of the project. By arranging the variable friction material layers 6 with different roughness coefficients and numbers, the average friction coefficient under the same piece of area coverage will become larger according to the increase of displacement due to the progressive friction coefficient towards the inner side of the second liner 5, thereby generating the variable friction damping force.
As shown in fig. 2, the three examples of the variable friction layer result in the variable friction force calculated according to the classical coulomb theorem to be characterized by multi-stage, which represents the diversity of the variable friction force that can be realized and the necessity of reasonably designing the variable friction force type. The specific dimensions of the connecting structure part at the pin head 1 should meet the strength checking calculation.
The invention can provide output in various damping forms by only one damper, and the friction force can be linearly and nonlinearly changed in high order to break through the limit of constant and nonlinear friction force. Under the condition of larger response, the friction damping force and the viscous damping force with saturated hysteresis curves can be provided at the same time, and the energy consumption capability is extremely strong. The invention can be provided with a plurality of dampers of the same type according to actual conditions and can be designed and used simultaneously.
Under the excitation of environmental load, the viscous damper with variable friction damping ensures that the damper can still provide excellent damping and energy dissipation capacity under the condition of low speed, and further improves the performance level of the damper in engineering application. The variable friction damping force and the viscous damping force are generated through the displacement and the speed of the damper response, and the output of the two damping forces can be provided by only one damper. The friction coefficient can be linearly changed by reasonably arranging the arrangement range of different friction layer materials. However, this setting may cause the friction force to vary linearly and nonlinearly at higher orders, which breaks the limit of constant nonlinearity of the friction force. Under the condition of larger response, the friction damping force and the viscous damping force with saturated hysteresis curves can be provided at the same time, and the energy consumption capability is extremely strong.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a viscidity attenuator with become friction damping, a serial communication port, including the jar barrel, the jar barrel includes first bush and second bush, the outer wall of first bush stretches into second bush inner wall forms inside confined the jar barrel, the inside viscidity damping material that is full of first bush, the inside of second bush is fixed with the piston rod, be fixed with the piston on the piston rod, be provided with a plurality of damping holes in the piston, the piston with the clearance has between the first bush inner wall, be equipped with the friction material layer that becomes on the inner wall of second bush.
2. The viscous damper with variable friction damping of claim 1, wherein a pin head is fixed to each end of the first bushing and the second bushing.
3. The viscous damper with variable friction damping of claim 1, wherein the cylinder barrel is a horizontally disposed, centrosymmetric barrel structure.
4. The viscous damper with variable friction damping of claim 1, wherein the first bushing outer wall is in sliding connection with the second bushing and the first bushing is in frictional connection with the layer of variable friction material.
5. The viscous damper with variable friction damping of claim 1, wherein the viscous damping material is sealed at both ends formed by the first and second bushings by a circular sealing ring and an annular sealing ring.
6. The viscous damper with variable friction damping of claim 1, wherein the second bushing end leaves air holes.
7. A viscous damper with variable friction damping according to claim 1, characterised in that the number of pistons is one or more.
8. The viscous damper with variable friction damping of claim 1, wherein the layer of variable friction material is made of polytetrafluoroethylene.
9. The viscous damper with variable friction damping according to claim 1, wherein the variable friction material layer includes a plurality of friction layers arranged in an axial direction of the second liner, and a coefficient of friction of the plurality of friction layers gradually increases from an outer side to an inner side of the second liner.
10. The viscous damper with variable friction damping of claim 9, wherein the friction material with three coefficients of friction is disposed inside the inner wall of the second bushing, and the three friction materials are distributed on the inner wall of the second bushing by length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210805252.6A CN115163716A (en) | 2022-07-08 | 2022-07-08 | Viscous damper with variable friction damping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210805252.6A CN115163716A (en) | 2022-07-08 | 2022-07-08 | Viscous damper with variable friction damping |
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| Publication Number | Publication Date |
|---|---|
| CN115163716A true CN115163716A (en) | 2022-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210805252.6A Pending CN115163716A (en) | 2022-07-08 | 2022-07-08 | Viscous damper with variable friction damping |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117150953A (en) * | 2023-08-21 | 2023-12-01 | 北京建筑大学 | Method and system for predicting damping force of double-order viscous damper |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518731A (en) * | 2011-12-09 | 2012-06-27 | 北京工业大学 | Gap self-adapting viscous damper with high energy consumption |
| JP2015031385A (en) * | 2013-08-07 | 2015-02-16 | オイレス工業株式会社 | Friction damper |
| CN104948631A (en) * | 2015-07-03 | 2015-09-30 | 上海上材减振科技有限公司 | Parallel type adjustable variable friction damper |
| CN105840713A (en) * | 2016-05-20 | 2016-08-10 | 济南大学 | Damper with viscous-friction combined action |
| CN213270836U (en) * | 2020-06-30 | 2021-05-25 | 江苏工邦振控科技有限公司 | Friction viscous fluid composite damper |
-
2022
- 2022-07-08 CN CN202210805252.6A patent/CN115163716A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518731A (en) * | 2011-12-09 | 2012-06-27 | 北京工业大学 | Gap self-adapting viscous damper with high energy consumption |
| JP2015031385A (en) * | 2013-08-07 | 2015-02-16 | オイレス工業株式会社 | Friction damper |
| CN104948631A (en) * | 2015-07-03 | 2015-09-30 | 上海上材减振科技有限公司 | Parallel type adjustable variable friction damper |
| CN105840713A (en) * | 2016-05-20 | 2016-08-10 | 济南大学 | Damper with viscous-friction combined action |
| CN213270836U (en) * | 2020-06-30 | 2021-05-25 | 江苏工邦振控科技有限公司 | Friction viscous fluid composite damper |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117150953A (en) * | 2023-08-21 | 2023-12-01 | 北京建筑大学 | Method and system for predicting damping force of double-order viscous damper |
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