CN110715782A - Vortex-induced vibration suppression experimental device based on nonlinear energy trap - Google Patents
Vortex-induced vibration suppression experimental device based on nonlinear energy trap Download PDFInfo
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- CN110715782A CN110715782A CN201910976759.6A CN201910976759A CN110715782A CN 110715782 A CN110715782 A CN 110715782A CN 201910976759 A CN201910976759 A CN 201910976759A CN 110715782 A CN110715782 A CN 110715782A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a vortex-induced vibration suppression experimental device based on a nonlinear energy trap, which comprises an experimental water tank, a connecting and fixing device and a vibration damping device, wherein a water tank cover is arranged at the top of the experimental water tank; the connecting and fixing device comprises a guide rail, a test piece, a support and a first spring, the guide rail is fixed on the inner walls of two opposite sides of the experimental water tank, the lower end of the support is connected with the test piece, the upper end of the support is connected with the first spring, and the cylindrical test piece and the support slide up and down along the guide rail; the vibration reduction device comprises a stainless steel square box, a nonlinear spring and a linear damper, wherein the bottom surface of the stainless steel square box is downwards connected with a first spring; the bottoms of the nonlinear spring and the linear damper are connected with a stainless steel square box, and the top of the nonlinear spring and the linear damper is connected with a water tank cover; the side of the stainless steel square box is provided with a plurality of slots, and the quality pieces are selectively inserted into the slots. The vortex-induced vibration suppression experimental device provided by the invention is simple in structure, and can effectively suppress vortex-induced vibration by designing various adjustable parameters of mass, rigidity and damping.
Description
Technical Field
The invention relates to a vortex-induced vibration suppression experimental device based on a nonlinear energy trap, and belongs to the technical field of ocean engineering.
Background
The submarine pipeline is connected with submarine resources and a sea surface platform, bears important work such as information communication, liquid guiding, mud guiding, drilling and the like, is the weakest ring of the whole platform system, and once an accident occurs, the normal operation of the whole system is influenced, and meanwhile, serious accidents such as crude oil leakage and the like can be caused. Vortex-induced vibration is one of the main causes of damage to submarine pipelines, and pipelines are prone to fatigue and even direct structural damage under the action of the vortex-induced vibration.
At present, the suppression method of pipeline vortex-induced vibration in ocean engineering is mainly passive suppression, and the measures are of three types: influencing the separation line or the separation shear layer by surface protrusions, influencing the entrainment layer by entrainment and preventing the interaction of the entrainment layer by the near wake stabilizer. These solutions essentially interfere and change the conditions of vortex generation and wake flow state by changing the shape of the surface or cylinder according to the fluid mechanics principle, although a certain effect can be obtained, they have the disadvantages of difficult installation, complex process, great influence by parameters, etc.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a vortex-induced vibration suppression device based on a nonlinear energy trap.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a vortex-induced vibration suppression experimental device based on a nonlinear energy trap comprises an experimental water tank, a connecting and fixing device and a vibration damping device, wherein a water tank cover is arranged at the top of the experimental water tank;
the connecting and fixing device comprises a support and a first spring, two opposite side walls of the experimental water tank are respectively fixed with a guide rail, the upper end of the support is connected with the first spring, the lower end of the support is connected with a test piece, the side surface of the support and two ends of the test piece are both nested and connected with the guide rails, so that the test piece and the support slide up and down along the guide rails;
the vibration damping device comprises a mass block, a nonlinear spring and a linear damper, wherein the bottom surface of the mass block is downwards detachably connected with the first spring, and the top surface of the mass block is upwards detachably connected with the nonlinear spring and the linear damper; the upper ends of the nonlinear spring and the linear damper are respectively detachably connected with the water tank cover; the mass of the mass is variable.
Further, the guide rails are welded and fixed on the inner walls of the two sides of the experimental water tank, and the surfaces of the two sides of the guide rails are flat and smooth.
Furthermore, the support is a door-shaped support, the lower ends of two vertical rods of the door-shaped support are connected with the testing piece, the middle position of a transverse rod of the door-shaped support is upwards connected with the first spring, the left end and the right end of the testing piece are connected with the guide rail in a nested manner, and the side faces of the two vertical rods of the support are connected with the guide rail in a nested manner, so that the testing piece and the support slide up and down along the guide rail.
Further, the number of the nonlinear springs is two, and the two nonlinear springs are respectively arranged on two sides of the linear damper.
Furthermore, the mass block is connected with the first spring, the mass block is connected with the nonlinear spring, the mass block is connected with the linear damper, the water tank cover is connected with the nonlinear spring, and the water tank cover is connected with the linear damper through U-shaped hooks.
Furthermore, the mass block is a square box body made of stainless steel, a plurality of slots are formed in the side face of the box body, and mass pieces are inserted into the slots.
Further, the mass pieces are steel pieces, and the mass of each mass piece is different.
Further, the first spring is a high-strength steel spring.
Has the advantages that: the experiment device for inhibiting the vortex-induced vibration based on the nonlinear energy trap is simple in structure and convenient to use, and can be used for adjusting parameters such as mass, rigidity and damping in the vibration damping device and researching the influence rule of each parameter on the vortex-induced vibration by arranging the nonlinear spring, the mass sheet and the like which can be disassembled and replaced, so that the experiment device can be used for carrying out parameter optimization experiment research on the vibration absorption structure of the nonlinear energy trap and further effectively inhibiting the vortex-induced vibration.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged detail view of portion A of FIG. 1;
fig. 3 is a schematic side view of a mass.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the vortex-induced vibration suppression test device based on the nonlinear energy trap comprises an experimental water tank 1, a connecting and fixing device and a vibration damping device, wherein a water tank cover 9 is arranged at the top of the experimental water tank 1.
Connect fixing device and include guide rail 2, test 5, support 3 and first spring 4, select a cylinder test piece as test 5, guide rail 2 fixes at experiment basin 1 double-phase offside inner wall, support 3 is door type support, and test 5 is connected to two montant lower extremes of support 3, and the horizontal pole intermediate position of support 3 upwards connects first spring 4, both ends and 2 nested connection of guide rail about test 5, two montant lateral surfaces and 2 nested connection of guide rail of support 3, specifically, the both ends of test 5 are equipped with the concave groove, and two montant lateral surfaces of support 3 also are equipped with the concave groove, and the concave groove joint is on guide rail 2 to make test 5 and support 3 can slide from top to bottom along guide rail 2.
In order to reduce the vibration of the guide rail as much as possible, the guide rail 2 is welded and fixed on the inner wall of the experimental water tank 1, the surfaces of the two sides of the guide rail 2 are flat and smooth, and the damping between the cylindrical test piece 5 and the guide rail 2 is reduced.
In order to avoid the interference of the first spring 4 and the vibration damper to the flow field, the first spring 4 and the vibration damper are arranged above the free liquid level in the experimental water tank, and the bracket 3 is connected with the cylindrical test piece 5 through the guide rail 2.
The vibration damping device comprises a mass block 6, a nonlinear spring 7 and a linear damper 8, wherein the bottom surface of the mass block 6 is downwards detachably connected with the first spring 4, and the top surface of the mass block 6 is upwards detachably connected with the nonlinear spring 7 and the linear damper 8; the upper ends of the nonlinear spring 7 and the linear damper 8 are respectively detachably connected with a water tank cover 9. The number of the nonlinear springs 7 is two, and the two springs are respectively arranged on two sides of the linear damper 8.
Referring to fig. 1 and 3, the mass block 6 is a square box made of stainless steel, a plurality of slots 10 are formed in the side surface of the box, and mass plates are inserted into the slots 10. The quality piece is the steel sheet, and the quality of each quality piece is different. In this embodiment, five slots 10 are provided, and n slots are selected to be inserted into mass pieces of different masses as required, where n is less than or equal to 5, so that the overall mass of the mass block 6 can be adjusted, and the influence rule of the mass parameters on the vortex-induced vibration can be studied.
Referring to fig. 2, a U-shaped hook 11 is disposed on the bottom surface of the mass block 6, and the top end of the first spring 4 is sleeved on the U-shaped hook; the top surface of the mass block 6 is provided with three U-shaped hooks 11, the lower surface of the water tank cover 9 is provided with three U-shaped hooks 11, the upper ends of the nonlinear spring 7 and the linear damper 8 are sleeved on the U-shaped hooks 11 below the water tank cover 9, and the lower ends of the nonlinear spring and the linear damper are sleeved on the U-shaped hooks 11 on the top surface of the mass block 6. The nonlinear spring 7 and the linear damper 8 are detachably connected with the stainless steel square box 6 and the water tank top cover 9 respectively, the nonlinear spring and the linear damper can be conveniently detached and replaced as required, parameters such as rigidity and damping are adjusted, and the influence rule of each parameter on vortex-induced vibration is researched.
The cylindrical test piece 5 is provided with a vibration sensor and a displacement sensor, and the stainless steel square box 6 is provided with the displacement sensor; the vibration sensor is used for monitoring the vibration of the cylindrical test piece 5, and the displacement sensor is used for capturing the motion displacement of the cylindrical test piece 5 and the stainless steel square box 6. The signals monitored by the vibration sensor and the displacement sensor can be wirelessly transmitted to an external computer for analysis.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. The utility model provides a vortex induced vibration restraines experimental apparatus based on nonlinear energy trap which characterized in that: comprises an experimental water tank (1), a connecting and fixing device and a vibration damping device, wherein the top of the experimental water tank is provided with a water tank cover (9);
the connecting and fixing device comprises a support (3) and a first spring (4), two opposite side walls of the experimental water tank (1) are respectively fixed with a guide rail (2), the upper end of the support (3) is connected with the first spring (4), the lower end of the support (3) is connected with a test piece (5), the side surface of the support (3) and two ends of the test piece (5) are both connected with the guide rail (2) in a nested manner, so that the test piece (5) and the support (3) can slide up and down along the guide rail (2);
the vibration damping device comprises a mass block (6), a nonlinear spring (7) and a linear damper (8), wherein the bottom surface of the mass block (6) is downwards detachably connected with the first spring (4), and the top surface of the mass block (6) is upwards detachably connected with the nonlinear spring (7) and the linear damper (8); the upper ends of the nonlinear spring (7) and the linear damper (8) are respectively detachably connected with a water tank cover (9); the mass of the mass (6) is variable.
2. The nonlinear energy trap-based vortex induced vibration suppression experimental apparatus as recited in claim 1, wherein: the guide rail (2) is welded and fixed on the inner walls of the two sides of the experimental water tank (1), and the surfaces of the two sides of the guide rail (2) are flat and smooth.
3. The nonlinear energy trap-based vortex induced vibration suppression experimental apparatus as recited in claim 1, wherein: support (3) are door type support, and test piece (5) are connected to two montant lower extremes of door type support, and the horizontal pole intermediate position of door type support upwards connects first spring (4), both ends and guide rail (2) nested connection about test piece (5), two montant lateral surfaces and guide rail (2) nested connection of support (3), make test piece (5) and support (3) slide from top to bottom along guide rail (2).
4. The nonlinear energy trap-based vortex induced vibration suppression experimental apparatus as recited in claim 1, wherein: the two nonlinear springs (7) are respectively arranged at two sides of the linear damper (8).
5. The nonlinear energy trap-based vortex induced vibration suppression experimental apparatus as recited in claim 1, wherein: the mass block (6) is connected with the first spring (4), the mass block (6) is connected with the nonlinear spring (7), the mass block (6) is connected with the linear damper (8), the water tank cover (9) is connected with the nonlinear spring (7), and the water tank cover (9) is connected with the linear damper (8) through U-shaped hooks.
6. The nonlinear energy trap-based vortex induced vibration suppression experimental apparatus as claimed in claim 1 or 5, wherein: the mass block (6) is a square box body made of stainless steel, a plurality of slots (10) are formed in the side face of the box body, and mass sheets are inserted into the slots (10).
7. The nonlinear energy trap-based vortex induced vibration suppression experimental apparatus as recited in claim 6, wherein: the quality piece is the steel sheet, and the quality of each quality piece is different.
8. The nonlinear energy trap-based vortex induced vibration suppression experimental apparatus as recited in claim 1, wherein: the first spring (4) is a high-strength steel spring.
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Cited By (6)
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| CN111219296A (en) * | 2020-04-14 | 2020-06-02 | 扬州大学 | Device suitable for restraining vortex-induced vibration of wind turbine tower |
| CN111306243A (en) * | 2020-04-01 | 2020-06-19 | 青岛理工大学 | Slideway type nonlinear energy trap vibration damper |
| CN113611195A (en) * | 2021-08-10 | 2021-11-05 | 合肥工业大学 | Dynamic vibration reduction experimental device and experimental method |
| CN114165549A (en) * | 2021-11-23 | 2022-03-11 | 中国空间技术研究院 | Nonlinear vibration damper for micro vibration of satellite disturbance source |
| CN114291209A (en) * | 2021-12-31 | 2022-04-08 | 中国船舶重工集团公司第七一九研究所 | Adjustable-stiffness transverse damper, mooring device, system and method |
| CN114561836A (en) * | 2021-11-03 | 2022-05-31 | 无锡希声科技有限公司 | Nonlinear steel rail damper and steel rail damping system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111306243A (en) * | 2020-04-01 | 2020-06-19 | 青岛理工大学 | Slideway type nonlinear energy trap vibration damper |
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| CN113611195A (en) * | 2021-08-10 | 2021-11-05 | 合肥工业大学 | Dynamic vibration reduction experimental device and experimental method |
| CN114561836A (en) * | 2021-11-03 | 2022-05-31 | 无锡希声科技有限公司 | Nonlinear steel rail damper and steel rail damping system |
| CN114165549A (en) * | 2021-11-23 | 2022-03-11 | 中国空间技术研究院 | Nonlinear vibration damper for micro vibration of satellite disturbance source |
| CN114165549B (en) * | 2021-11-23 | 2023-11-10 | 中国空间技术研究院 | Nonlinear vibration damper for satellite disturbance vibration source micro-vibration |
| CN114291209A (en) * | 2021-12-31 | 2022-04-08 | 中国船舶重工集团公司第七一九研究所 | Adjustable-stiffness transverse damper, mooring device, system and method |
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