CN111155672A - Self-adaptive tuned mass damper based on shear thickening liquid - Google Patents
Self-adaptive tuned mass damper based on shear thickening liquid Download PDFInfo
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- CN111155672A CN111155672A CN202010025852.1A CN202010025852A CN111155672A CN 111155672 A CN111155672 A CN 111155672A CN 202010025852 A CN202010025852 A CN 202010025852A CN 111155672 A CN111155672 A CN 111155672A
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- polyurethane
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- shear thickening
- spiral hose
- hose
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- 230000008719 thickening Effects 0.000 title claims abstract description 45
- 239000007788 liquid Substances 0.000 title claims abstract description 25
- 229920002635 polyurethane Polymers 0.000 claims abstract description 59
- 239000004814 polyurethane Substances 0.000 claims abstract description 59
- 239000012530 fluid Substances 0.000 claims description 20
- 230000000694 effects Effects 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 description 7
- 230000004044 response Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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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- Emergency Management (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a self-adaptive tuning mass damper based on shear thickening liquid, which comprises a base, two side plates, a circular shaft, a mass block, two groups of polyurethane spiral hoses, a linear bearing and two groups of tension springs, wherein the two side plates are mutually symmetrical and are vertically and fixedly connected with the base; when the mass block reciprocates left and right, the polyurethane spiral hose and the shear thickening liquid in the polyurethane spiral hose perform shear motion, and the shear thickening liquid generates shear stress according to the viscosity coefficient at the current vibration speed, so that different rigidity is generated, and the self-adaptive adjustment of the overall rigidity of the damper is realized. The invention has simple structure and wide application range, does not need to depend on any external measures, and can automatically and adaptively adjust the integral rigidity.
Description
Technical Field
The invention belongs to the field of civil engineering vibration control, and particularly relates to a self-adaptive tuned mass damper based on shear thickening liquid.
Background
The tuned mass damper is an economical and reliable vibration damper, and is widely applied to wind-resistant and earthquake-resistant designs of structures such as high-rise buildings, large-span bridges and the like. The basic structure of the vibrator comprises a mass block and an elastic element, wherein the mass block and the elastic element form a vibrator with certain natural vibration frequency. The working mechanism of the tuned mass damper is to design parameters of the mass block and the elastic element, so that the natural vibration frequency of the tuned mass damper is matched with the natural vibration frequency of a certain mode of the controlled structure, and at the moment, the vibrator of the tuned mass damper can absorb the vibration energy of the controlled structure to the maximum extent, so that the optimal control effect is exerted, and the dynamic response of the structure is reduced.
However, in practical applications, it is difficult to precisely measure the natural frequency of the building structure, and when the difference between the natural frequency of the tuned mass damper and the real frequency of the building structure is relatively large, the vibration damping effect is greatly reduced; more importantly, under the load action of external wind, earthquake and the like, the vibration of the building structure often shows multi-modal characteristics, and the vibration of different modes occurs at different moments or a plurality of modes are overlapped at the same time. While the mass and stiffness parameters of the tuned mass damper are often optimized for a certain mode and cannot be changed in a self-adaptive manner according to external vibration, so that the control effect on other mode vibration is weak.
Disclosure of Invention
Aiming at the defects, the invention provides the self-adaptive tuned mass damper based on the shear thickening liquid, which utilizes the mechanical property that the viscosity coefficient of the shear thickening liquid changes along with the shear rate to realize the self-adaptive adjustment of the integral rigidity, so that the self-vibration frequency of the tuned mass damper is close to the current modal frequency of the structure, and the optimal vibration reduction control effect is always exerted under different modes.
The self-adaptive tuned mass damper comprises a base, two side plates, a circular shaft, a mass block, two groups of polyurethane spiral hoses, linear bearings and two groups of tension springs, wherein the two side plates are mutually symmetrical and are vertically and fixedly connected with the base; tension springs are arranged between the two side plates and the mass block, the two tension springs provide initial rigidity, and the mass block is located at a balance position in a static state; polyurethane spiral hoses are arranged between the two groups of side plates and the mass block, one end of each polyurethane spiral hose is fixedly connected with the mass block, and the other end of each polyurethane spiral hose is fixedly connected with the side plate; the inside of each polyurethane spiral hose is filled with shear thickening liquid; when the mass block reciprocates left and right, the polyurethane spiral hose and the shear thickening liquid in the polyurethane spiral hose perform shear motion, and the shear thickening liquid generates shear stress according to the viscosity coefficient at the current vibration speed, so that the self-adaptive adjustment of the overall rigidity of the damper is realized.
The invention also has the following technical characteristics: the self-adaptive tuned mass damper based on the shear thickening fluid is characterized in that the rigidity provided by the polyurethane spiral hose filled with the shear thickening fluid is as follows:
in the formula: k is the stiffness provided by a polyurethane spiral hose filled with a shear thickening fluid inside;
g is the shear modulus of the polyurethane hose;
dextis the outer diameter of the polyurethane spiral hose;
dintis the inner diameter of the polyurethane spiral hose;
n is the effective number of turns of the polyurethane spiral hose;
d is the pitch diameter of the polyurethane spiral hose;
τ (ω) is the shear stress achieved by the shear thickening fluid, which varies with the shear rate, in relation to the vibration frequency ω; when the structure vibrates in different modes, the vibration frequency is changed, the corresponding shearing rate is changed, and the rigidity realized by the shearing thickening liquid is changed, so that the self frequency of the damper is close to the current vibration, and the optimal vibration reduction control effect is always kept.
Of the above mentioned stiffnesses, the stiffness provided by the polyurethane hose is a material constant and does not change with external vibrations, but the stiffness provided by the shear thickening fluid will change with external vibrations. Generally, the higher the structural vibration mode, the greater the speed response will be. The viscosity coefficient of shear thickening fluids increases with increasing shear rate. Therefore, when the vibration modes of the structure are different, the shear rates of the shear thickening liquid in the spiral hose are different, the viscosity coefficient of the shear thickening liquid is changed, the realized shear stress is changed along with the frequency, the integral rigidity is adaptively changed according to the change of the vibration mode of the external structure, the self frequency of the tuned mass damper is always close to the vibration frequency of the current structure, and the optimal vibration reduction control effect is exerted.
The invention has the advantages that: the self-adaptive tuned mass damper has the advantages of simple structure, wide application range, no need of depending on any external measures, no need of knowing the current vibration state of the structure, and capability of automatically and adaptively adjusting the integral rigidity by utilizing the mechanical property of the shear thickening liquid, so that the self frequency of the tuned mass damper is close to the current vibration frequency of the structure, and the self-adaptive tuned mass damper has the intelligent characteristic of self-adaptation, and is particularly suitable for multi-mode vibration damping control of the structure.
Drawings
FIG. 1 is an overall configuration of an adaptive tuned mass damper based on shear thickening fluids according to the present invention;
FIG. 2 is an end connection of a polyurethane flexible hose according to the present invention;
FIG. 3 is a view of a polyurethane spiral hose and shear thickening fluid of the present invention;
FIG. 4 is a schematic of the working mechanism of the present invention;
the device comprises a base 1, a base 2, side plates 3, a nut 4, a circular shaft 5, a linear bearing 6, a mass block 7, an end connection 8, a polyurethane spiral hose 9, shear thickening liquid 10 and a tension spring.
Detailed Description
The invention will be described in further detail below by way of example with reference to the accompanying drawings, to which, however, the scope of the invention is not limited.
Example 1
As shown in fig. 1, the self-adaptive tuned mass damper based on shear thickening fluid comprises a base 1, two groups of side plates 2, a circular shaft 4, a linear bearing 5, a mass block 6, a polyurethane spiral hose 8 and two groups of tension springs 10; the base 1 is made of a common steel plate, and round holes are reserved at two ends of the base, so that the base is convenient to mount with a structure; the two groups of side plates 2 are symmetrically fixed on the base 1 through welding, and the circular shaft 4 is fixed between the two side plates 2 through a nut 3;
the mass block 6 is connected with the round shaft 4 in a sliding way through a linear bearing 5; the mass block 6 can freely move along the circular shaft 4 to form a mass part of the tuned mass damper; the two groups of tension springs 10 are symmetrically distributed between the side plate 2 and the mass block 6, provide the initial rigidity of the mass block 6 and keep the mass block 6 at a balance position in a static state;
the polyurethane hose is processed into a spiral shape through hot molding, the inner diameter of the polyurethane hose is 2mm larger than that of the round shaft 4, so that the polyurethane hose can smoothly pass through the round shaft 4, the two ends of the polyurethane hose are respectively fixed on the side plate 2 and the mass block 6 through end connections 7, and the polyurethane hose 8 can move along with the mass block 6 in stretching and compressing states.
The polyurethane spiral hose 8 is filled with the shear thickening liquid 9, when the mass block 6 reciprocates, the polyurethane spiral hose 8 stretches and compresses, and the shear thickening liquid 9 in the corresponding section generates shear motion. At the moment, the shear thickening liquid 9 generates shear stress according to the viscosity coefficient under the current vibration speed, and provides different rigidity along with the change of the vibration speed in a self-adaptive manner;
the embodiment aims at the defect that the traditional tuned mass damper cannot change the rigidity independently, changes the rigidity of the damper according to the difference of structural vibration response speeds by utilizing the mechanical characteristics of shear thickening liquid, adjusts the natural vibration frequency, and is close to the structural vibration frequency, so that the optimal vibration reduction control effect is always kept under different vibration modes.
Example 2
FIG. 2 shows an end connection schematic of a polyurethane spiral hose in an adaptive tuned mass damper based on shear thickening fluid according to the present invention. The end connection 7 is provided with a round hole in the middle for passing through the round shaft 4; the width of the end connection 7 is slightly smaller than the inner diameter of the polyurethane spiral hose 8 and presses at least one end of the polyurethane spiral hose 8, so that the polyurethane spiral hose 8 can always follow the movement of the mass 6.
As shown in fig. 3, the polyurethane spiral hose 8 is filled with the shear thickening fluid 9, and the two components together form a composite spiral spring with the following stiffness:
where k is the stiffness provided by a polyurethane spiral hose internally filled with a shear thickening fluid;
g is the shear modulus of the polyurethane hose;
dextis the outer diameter of the polyurethane spiral hose;
dintis the inner diameter of the polyurethane spiral hose;
n is the effective number of turns of the polyurethane spiral hose;
d is the pitch diameter of the polyurethane spiral hose;
τ (ω) is the shear stress achieved by the shear thickening fluid, which varies with the shear rate, and is related to the vibration frequency ω.
The rigidity provided by the polyurethane spiral hose 8 is determined by the size and material parameters of the polyurethane spiral hose, is a constant and does not change along with the change of external vibration; the viscosity coefficient of the shear thickening fluid 9 changes with the vibration rate (mainly influenced by the structural modal frequency ω within the same amplitude range), so that when the structural vibration modes are different, the polyurethane spiral hose filled with the shear thickening fluid can realize different rigidities, that is, the self rigidity can be adaptively changed according to the current structural vibration state.
Example 3
FIG. 4 is a schematic diagram showing the working mechanism of the self-adaptive tuned mass damper based on shear thickening fluid applied to control the first two-stage vibration of the structure. Generally, the higher the order of the structural vibration mode, the greater the speed response due to the increase of the vibration frequency. The secant stiffness of the polyurethane spiral hose is different under the maximum speed response of the first-order and second-order vibration of the structure. The integral rigidity of the tuned mass damper is adjusted by selecting the parameters of the inner diameter, the outer diameter, the intermediate diameter and the like of the polyurethane spiral hose, so that the frequency of the tuned mass damper is matched with the first order and the second order of the structure respectively. When the structure generates vibration of different modes, the tuned mass damper disclosed by the invention can self-adaptively adjust the integral rigidity of the tuned mass damper based on the current vibration rate, so that the optimal vibration reduction control effect is achieved.
Claims (2)
1. The utility model provides a self-adaptation harmonious mass damper based on shear thickening liquid, includes base, two curb plates, circle axle, quality piece, two sets of polyurethane helical hose, linear bearing and two sets of extension springs, the mutual symmetry of both sides board and the perpendicular fixed connection of base, its characterized in that: two ends of the round shaft are respectively fixedly connected with the two side plates, the mass block is provided with a through hole, a linear bearing is arranged in the through hole, and the mass block is connected with the round shaft in a sliding manner through the linear bearing; tension springs are arranged between the two side plates and the mass block, the two tension springs provide initial rigidity, and the mass block is located at a balance position in a static state; polyurethane spiral hoses are arranged between the two groups of side plates and the mass block, one end of each polyurethane spiral hose is fixedly connected with the mass block, and the other end of each polyurethane spiral hose is fixedly connected with the side plate; the inside of each polyurethane spiral hose is filled with shear thickening liquid; when the mass block reciprocates left and right, the polyurethane spiral hose and the shear thickening liquid in the polyurethane spiral hose perform shear motion, and the shear thickening liquid generates shear stress according to the viscosity coefficient at the current vibration speed, so that different rigidity is generated, and the self-adaptive adjustment of the overall rigidity of the damper is realized.
2. An adaptive tuned mass damper based on shear thickening fluids according to claim 1, wherein: the stiffness provided by the polyurethane spiral hose with the shear thickening fluid filled inside is:
in the formula: k is the stiffness provided by a polyurethane spiral hose filled with a shear thickening fluid inside;
g is the shear modulus of the polyurethane hose;
dextis the outer diameter of the polyurethane spiral hose;
dintis the inner diameter of the polyurethane spiral hose;
n is the effective number of turns of the polyurethane spiral hose;
d is the pitch diameter of the polyurethane spiral hose;
τ (ω) is the shear stress achieved by the shear thickening fluid, which varies with the shear rate, in relation to the vibration frequency ω; when the structure vibrates in different modes, the vibration frequency is changed, the corresponding shearing rate is changed, and the rigidity realized by the shearing thickening liquid is changed, so that the self frequency of the damper is close to the current vibration, and the optimal vibration reduction control effect is always kept.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010025852.1A CN111155672B (en) | 2020-01-10 | 2020-01-10 | Self-adaptive tuned mass damper based on shear thickening liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010025852.1A CN111155672B (en) | 2020-01-10 | 2020-01-10 | Self-adaptive tuned mass damper based on shear thickening liquid |
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| CN111155672A true CN111155672A (en) | 2020-05-15 |
| CN111155672B CN111155672B (en) | 2021-04-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112695911A (en) * | 2020-12-18 | 2021-04-23 | 中铁大桥局集团有限公司 | Self-adaptive variable-rigidity tuned mass damper |
| CN113843638A (en) * | 2021-09-14 | 2021-12-28 | 华中科技大学 | Method for improving machining stability of thin-wall part and application |
| CN115709295A (en) * | 2022-12-08 | 2023-02-24 | 哈尔滨理工大学 | Self-adaptive vibration-damping boring bar filled with shear thickening fluid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9303709B2 (en) * | 2014-08-11 | 2016-04-05 | Ggodrich Corporation | Shock damper |
| CN106438796A (en) * | 2016-11-08 | 2017-02-22 | 浙江工业大学 | Composite spiral spring |
| CN206268366U (en) * | 2016-11-08 | 2017-06-20 | 浙江工业大学 | Based on shear thickening glue non-linear spring device |
| CN108589957A (en) * | 2018-06-20 | 2018-09-28 | 沈阳建筑大学 | A kind of STF and MRF combined types tuned mass damper |
| CN110485267A (en) * | 2019-09-03 | 2019-11-22 | 哈尔滨工业大学（深圳） | A kind of adhesion type self-tuning mass damper and its application method based on shear thickening liquid |
-
2020
- 2020-01-10 CN CN202010025852.1A patent/CN111155672B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9303709B2 (en) * | 2014-08-11 | 2016-04-05 | Ggodrich Corporation | Shock damper |
| CN106438796A (en) * | 2016-11-08 | 2017-02-22 | 浙江工业大学 | Composite spiral spring |
| CN206268366U (en) * | 2016-11-08 | 2017-06-20 | 浙江工业大学 | Based on shear thickening glue non-linear spring device |
| CN108589957A (en) * | 2018-06-20 | 2018-09-28 | 沈阳建筑大学 | A kind of STF and MRF combined types tuned mass damper |
| CN110485267A (en) * | 2019-09-03 | 2019-11-22 | 哈尔滨工业大学（深圳） | A kind of adhesion type self-tuning mass damper and its application method based on shear thickening liquid |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112695911A (en) * | 2020-12-18 | 2021-04-23 | 中铁大桥局集团有限公司 | Self-adaptive variable-rigidity tuned mass damper |
| CN113843638A (en) * | 2021-09-14 | 2021-12-28 | 华中科技大学 | Method for improving machining stability of thin-wall part and application |
| CN115709295A (en) * | 2022-12-08 | 2023-02-24 | 哈尔滨理工大学 | Self-adaptive vibration-damping boring bar filled with shear thickening fluid |
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| CN111155672B (en) | 2021-04-30 |
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