CN111043211A - Built-in eddy current tuned mass damper - Google Patents

Built-in eddy current tuned mass damper Download PDF

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Publication number
CN111043211A
CN111043211A CN201911202943.1A CN201911202943A CN111043211A CN 111043211 A CN111043211 A CN 111043211A CN 201911202943 A CN201911202943 A CN 201911202943A CN 111043211 A CN111043211 A CN 111043211A
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CN
China
Prior art keywords
block
eddy current
mass
fixed
fixing piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911202943.1A
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Chinese (zh)
Inventor
黄国
张宏杰
杨风利
韩军科
邵帅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Original Assignee
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, China Electric Power Research Institute Co Ltd CEPRI filed Critical State Grid Corp of China SGCC
Priority to CN201911202943.1A priority Critical patent/CN111043211A/en
Publication of CN111043211A publication Critical patent/CN111043211A/en
Pending legal-status Critical Current

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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
    • F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
    • 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
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
    • 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
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
    • F16F15/035—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means by use of eddy or induced-current damping
    • 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
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
    • 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
    • F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T19/00—Devices providing for corona discharge
    • H01T19/04—Devices providing for corona discharge having pointed electrodes
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/0005—Attachment, e.g. to facilitate mounting onto confer adjustability

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The invention provides a built-in eddy current tuned mass damper, which comprises a first fixing piece (2), a suspender (4), a mass block (5), a copper block (6) and a second fixing piece (7); the upper end of the suspender (4) is fixed at the central position of the first fixing piece (2), and the lower end of the suspender is fixed with the mass block (5); the copper block (6) is fixed at the central position of the second fixing piece (7), the suspender swings along with the mass block, the lightning rod with larger specification and quality can be damped, the damping effect is good, the copper block is fixed on the inner wall of the steel pipe type lightning rod through the bolt, the weather resistance is good, the welding process is avoided, and the installation and the construction are convenient; according to the invention, the mass block is suspended inside the steel tube type lightning rod through the suspension rod, so that the size of the vibration damper is not limited, and the vibration damper can be suitable for steel tube lightning rods with various specifications; the damper does not need external energy supply, and has the advantages of small elastic modulus, large section size, small length size and convenience in design, manufacture and installation of the damper.

Description

Built-in eddy current tuned mass damper
Technical Field
The invention relates to the technical field of wind vibration control in electric power engineering, in particular to a built-in eddy current tuned mass damper.
Background
In order to prevent important electrical equipment in a substation from being damaged by lightning, a lightning rod is usually erected in the substation. The lightning rod is usually in an independent steel pipe type, is convenient to design, process and install and is widely used in China. However, the lightning rod of the independent steel pipe type also has the defect that when wind blows over the steel pipe lightning rod, vortexes which fall off alternately are generated at the rear part of the steel pipe lightning rod, and the vortexes generate vortex shedding force in the transverse wind direction. When the frequency of vortex shedding is close to the natural frequency of the steel pipe lightning rod, resonance occurs, which is called vortex-induced vibration in engineering. The high-frequency reciprocating vibration can possibly cause fatigue damage to the steel tube lightning rod, so that the steel tube lightning rod is broken and collapsed.
The lightning rod is an important component of the transformer substation and plays an important role in lightning protection of the transformer substation. In the structural design of the lightning rod, the influence of downwind wind vibration is mainly considered, but the lightning rod structure can also generate transverse wind vortex vibration at a lower wind speed, and the collapse accident of the steel tube lightning rod occurs from a transformer substation with 220 kV-750 kV lines, so that the wind vibration control problem of the steel tube lightning rod becomes a key problem to be solved urgently in power transmission and transformation engineering. The lightning rod vibration damper of the transformer substation in the prior art comprises a hoop sleeved on the outer wall surface of the top of a lightning rod body along the circumference, an annular mass block is horizontally sleeved outside the hoop, a spring and a damper are connected between the outer wall of the hoop and the inner wall of the annular mass block, a support is fixed on the lightning rod body above the hoop in a mode of extending outwards, and the support is connected with the upper end face of the annular mass block through a suspension cable. The support adopts a plurality of bracing pieces of welding on the lightning rod needle body, and the bracing piece outwards extends and evenly distributed is at the lightning rod needle body periphery. The disadvantages of the above-described damping device are as follows: 1) when the lightning rod is connected, a large amount of welding processes are used, so that the lightning rod is inconvenient to install and construct; 2) a large number of springs are used for providing elastic force, so that the size of the vibration damping device is limited, and the vibration damping device is usually large in size and inconvenient to develop in a miniaturized mode; 3) the lightning rod is arranged outside the lightning rod, and the weather resistance is poor; 4) the suspension cable is used for supporting the mass block, the strength of the suspension cable is limited, the mass of the mass block is limited, and the lightning rod with large specification and large mass cannot be damped.
Disclosure of Invention
In order to overcome the defect that the lightning rod with larger specification and mass can not be damped in the prior art, the invention provides a built-in eddy current tuned mass damper, which comprises a first fixing piece (2), a suspender (4), a mass block (5), a copper block (6) and a second fixing piece (7); the upper end of the suspender (4) is fixed at the central position of the first fixing piece (2), and the lower end of the suspender is fixed with the mass block (5); the copper block (6) is fixed in the central position of second mounting (7), and the jib is along with the quality piece swing, can carry out the damping to the great lightning rod of specification and quality, and the damping is effectual.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a built-in eddy current tuned mass damper, which comprises a first fixing piece (2), a suspender (4), a mass block (5), a copper block (6) and a second fixing piece (7);
the first fixing piece (2) and the second fixing piece (7) are fixed on the inner wall of the steel tube lightning rod (1), the upper end of the suspender (4) is fixed at the central position of the first fixing piece (2), and the lower end of the suspender is fixed with the mass block (5); the copper block (6) is fixed at the center of the second fixing piece (7), and a certain distance is reserved between the copper block (6) and the mass block (5).
The first fixing piece (2) and the second fixing piece (7) are the same in size and are both cross fixing rods.
The included angle of two adjacent limb edges in the cross-shaped fixing rod is 90 degrees, and a chamfer angle circular arc is arranged.
The copper block (6) is circular, and the thickness of the copper block is 1-3 cm.
The distance is 3-10 mm.
The suspender (4) is a solid cylinder and is made of stainless steel or aluminum.
A through hole is formed in the center of the mass block (5);
the lower end of the suspender (4) passes through the through hole and is fixed with the mass block (5).
The mass block (5) is a disc-shaped permanent magnet and is axially magnetized.
And bolts are used for fixing the suspension rod (4) and the first fixing piece (2), the suspension rod (4) and the mass block (5) and the copper block (6) and the second fixing piece (7).
The distance between the mass block (5) and the steel pipe lightning rod (1) is larger than the maximum horizontal design amplitude;
the length of the suspender (4) and the mass of the mass block (5) are determined according to the maximum horizontal design amplitude;
the maximum horizontal design amplitude is determined according to the wind speed and the quality of the steel tube lightning rod (1).
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention provides a built-in eddy current tuned mass damper, which comprises a first fixing piece (2), a suspender (4), a mass block (5), a copper block (6) and a second fixing piece (7); the first fixing piece (2) and the second fixing piece (7) are fixed on the inner wall of the steel tube lightning rod (1), the upper end of the suspender (4) is fixed at the central position of the first fixing piece (2), and the lower end of the suspender is fixed with the mass block (5); the copper block (6) is fixed at the center of the second fixing piece (7), a certain distance is reserved between the copper block (6) and the mass block (5), the suspender swings along with the mass block, the lightning rod with large specification and mass can be damped, and the damping effect is good;
the built-in eddy current tuned mass damper is built-in and is fixed on the inner wall of the steel tube type lightning rod through the bolt, so that the built-in eddy current tuned mass damper is good in weather resistance, avoids using a welding process and is convenient to install and construct;
according to the invention, the mass block is suspended inside the steel tube type lightning rod through the suspension rod, so that the size of the vibration damper is not limited, and the vibration damper can be suitable for steel tube lightning rods with various specifications;
the suspender has no initial friction, provides an extremely low lower limit value for the damping of the damper, improves the wind vibration control sensitivity of the damper, can play a role in inhibiting vibration when the steel pipe lightning rod has small vibration, has the same section inertia moment in all directions of 360 degrees, can control the vibration of the steel pipe lightning rod generated by wind in all directions, does not need to provide energy from the outside, has smaller elastic modulus, larger section size and smaller length size, and is convenient for the design, manufacture and installation of the damper;
the mass block is a disc-shaped permanent magnet which generates a magnetic field, when the disc-shaped permanent magnet moves relative to the copper block, eddy current can be generated in the copper block, vibration energy is dissipated into heat energy generated by the eddy current, external energy is not needed, a large damping ratio can be realized, in the swinging process of the mass block, the copper block can cut magnetic induction lines around the mass block to form magnetic damping, the size of the magnetic damping can be flexibly adjusted by adjusting the thickness of copper block and the distance (namely air gap) between the permanent magnet and the copper block, and a large adjusting range is achieved;
the invention changes the rigidity of the damper by changing the diameter and the length of the hanging rod, so that the rigidity of the damper is zero-activity adjustable, the mechanical friction problem and the sealing problem are avoided, and the reliability and the durability are good.
Drawings
FIG. 1 is a front view of an embodiment of the present invention with an internal eddy current tuned mass damper;
FIG. 2 is a top view of an embodiment of the present invention with an internal eddy current tuned mass damper;
FIG. 3 is a diagram illustrating the structure of the first fixing member/the second fixing member according to an embodiment of the present invention;
in the figure, 1, a steel pipe lightning rod, 2, a first fixing piece, 3, a bolt, 4, a suspender, 5, a mass block, 6, a copper block, 7, a second fixing piece, 8 and a bolt hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention provides a built-in eddy current tuned mass damper which is fixed inside a steel tube type lightning rod 1 through a bolt 3, and the built-in eddy current tuned mass damper provided by the embodiment of the invention comprises a first fixing piece 2, a suspender 4, a mass block 5, a copper block 6 and a second fixing piece 7;
the first fixing piece 2 and the second fixing piece 7 are fixed on the inner wall of the steel tube lightning rod 1, the upper end of the suspender 4 is fixed at the central position of the first fixing piece 2, and the lower end of the suspender is fixed with the mass block 5; the copper block 6 is fixed at the center of the second fixing member 7.
First mounting 2 and 7 sizes of second mounting are the same, and are the cross dead lever, are equipped with bolt hole 8 on first mounting 2 and the second mounting 7, and first mounting 2 and second mounting pass through the bolt hole 8 through the bolt and are fixed with the inner wall of steel pipe lightning rod 1.
The included angle between two adjacent limb edges in the cross-shaped fixed rod is 90 degrees, and a chamfer angle circular arc is arranged.
The copper block 6 is round or square, and the thickness of the copper block is 1-3 cm.
The copper block 6 and the mass block 5 are spaced by a certain distance, and the distance is 3-10 mm.
The suspender 4 is a solid cylinder made of stainless steel or aluminum.
A through hole is formed in the center of the mass block 5;
the lower end of the suspension rod 4 passes through the through hole and is fixed with the mass block 5.
The mass block 5 is a disk-shaped permanent magnet, which is axially magnetized.
Bolts are used for fixing the suspension rod 4 and the first fixing piece 2, the suspension rod 4 and the mass block 5, and the copper block 6 and the second fixing piece 7.
The distance between the mass block 5 and the steel tube lightning rod 1 is larger than the maximum horizontal design amplitude;
the length and the diameter of the suspender 4 and the mass of the mass block 5 are determined according to the maximum horizontal design amplitude, and the diameter of the suspender 4 is 3-10 mm in the embodiment of the invention.
The maximum horizontal design amplitude is determined according to the wind speed and the quality of the steel tube lightning rod 1.
The working principle of the built-in eddy current tuned mass damper provided by the embodiment of the invention is as follows:
when the steel tube lightning rod 1 vibrates, the mass block 5 at the lower part of the suspender 4 vibrates, the mass block 5 moves relative to the copper block 6, the copper block 6 cuts magnetic induction lines generated by the mass block, eddy current is generated in the copper block 6, the eddy current further generates heat energy, and the heat energy is dissipated along with air, so that the steel tube lightning rod 1 is protected.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.

Claims (10)

1. A built-in eddy current tuned mass damper is characterized by comprising a first fixing piece (2), a suspender (4), a mass block (5), a copper block (6) and a second fixing piece (7);
the first fixing piece (2) and the second fixing piece (7) are fixed on the inner wall of the steel tube lightning rod (1), the upper end of the suspender (4) is fixed at the central position of the first fixing piece (2), and the lower end of the suspender is fixed with the mass block (5); the copper block (6) is fixed at the center of the second fixing piece (7), and a certain distance is reserved between the copper block (6) and the mass block (5).
2. The built-in eddy current tuned mass damper according to claim 1, characterized in that the first fixture (2) and the second fixture (7) are the same size and are both cross-fixed rods.
3. The internal eddy current tuned mass damper according to claim 2, wherein the angle between two adjacent limbs in said cross-shaped fixed rod is 90 ° and is provided with a chamfered arc.
4. The built-in eddy current tuned mass damper according to claim 1, characterized in that the copper block (6) is circular with a thickness of 1-3 cm.
5. The built-in eddy current tuned mass damper according to claim 1, wherein said distance is 3-10 mm.
6. The internal eddy current tuned mass damper according to claim 1, wherein the suspension rod (4) is a solid cylinder made of aluminum.
7. The built-in eddy current tuned mass damper according to claim 1, characterized in that the mass (5) is provided with a through hole in the center;
the lower end of the suspender (4) passes through the through hole and is fixed with the mass block (5).
8. The built-in eddy current tuned mass damper according to claim 1, characterized in that the mass (5) is a disc-shaped permanent magnet, which is axially magnetized.
9. The built-in eddy current tuned mass damper according to claim 1, wherein the suspension rod (4) and the first fixture (2), the suspension rod (4) and the mass block (5), and the copper block (6) and the second fixture (7) are fixed by bolts.
10. The built-in eddy current tuned mass damper according to claim 1, characterized in that the distance between the mass block (5) and the steel pipe lightning rod (1) is larger than the maximum horizontal design amplitude;
the length and the diameter of the suspender (4) and the mass of the mass block (5) are determined according to the maximum horizontal design amplitude;
the maximum horizontal design amplitude is determined according to the wind speed and the quality of the steel tube lightning rod (1).
CN201911202943.1A 2019-11-29 2019-11-29 Built-in eddy current tuned mass damper Pending CN111043211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911202943.1A CN111043211A (en) 2019-11-29 2019-11-29 Built-in eddy current tuned mass damper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911202943.1A CN111043211A (en) 2019-11-29 2019-11-29 Built-in eddy current tuned mass damper

Publications (1)

Publication Number Publication Date
CN111043211A true CN111043211A (en) 2020-04-21

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Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113202697A (en) * 2021-04-26 2021-08-03 上海泰胜风能装备股份有限公司 High-damping wind power tower cylinder
WO2022099717A1 (en) * 2020-11-11 2022-05-19 中国电力科学研究院有限公司 Eddy-current tuned mass damper for vibration control of steel-tube lightning rod

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022099717A1 (en) * 2020-11-11 2022-05-19 中国电力科学研究院有限公司 Eddy-current tuned mass damper for vibration control of steel-tube lightning rod
CN113202697A (en) * 2021-04-26 2021-08-03 上海泰胜风能装备股份有限公司 High-damping wind power tower cylinder
CN113202697B (en) * 2021-04-26 2023-02-24 上海泰胜风能装备股份有限公司 High-damping wind power tower cylinder

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