CN108895114B - Composite nonlinear energy trap vibration damper - Google Patents
Composite nonlinear energy trap vibration damper Download PDFInfo
- Publication number
- CN108895114B CN108895114B CN201811001108.7A CN201811001108A CN108895114B CN 108895114 B CN108895114 B CN 108895114B CN 201811001108 A CN201811001108 A CN 201811001108A CN 108895114 B CN108895114 B CN 108895114B
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- Prior art keywords
- track
- nonlinear
- linear
- composite
- sphere
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- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000013016 damping Methods 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 230000009467 reduction Effects 0.000 abstract description 5
- 239000004020 conductor Substances 0.000 abstract description 3
- 230000005288 electromagnetic effect Effects 0.000 abstract description 3
- 230000006698 induction Effects 0.000 abstract description 3
- 230000021715 photosynthesis, light harvesting Effects 0.000 abstract description 3
- 230000006798 recombination Effects 0.000 abstract description 2
- 238000005215 recombination Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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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
- 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
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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
- F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a composite nonlinear energy trap vibration damper, which adopts two nonlinear orbits which are respectively arranged in an intersecting manner in the X direction and the Y direction. The X-direction tubular track is arranged at the bottom layer, and the Y-direction tubular track is arranged at the upper layer. When two spheres roll in the respective pipelines, the reaction force formed by theoretical recombination can point to any direction in the three-dimensional space, and the complex vibration reduction requirement of the device in operation can be met. And the two ends of each track are provided with a baffle cover fixed with high damping rubber, so that the energy dissipation during impact is enhanced. In addition, the permanent magnet is embedded into the sphere, and when the sphere rolls in the pipeline, a moving magnetic field is formed. When the moving magnetic field intersects the metal pipe, the magnetic induction line and the conductor are mutually cut, so that eddy current is generated in the metal pipe, and electromagnetic force generated by the eddy current can be equivalent to viscous damping, so that energy is dissipated by utilizing electromagnetic effect.
Description
Technical Field
The invention belongs to the field of wind resistance and earthquake resistance of a crane system, a building and a bridge, and particularly relates to a composite nonlinear energy trap vibration damper.
Background
When the engineering ship is adopted to carry out installation construction operation under complex sea conditions, the forced vibration amplitude generated by the lifting hook is overlarge, and the actually measured swing amplitude of the lifting hook reaches plus or minus 10 meters (swing along the transverse direction and the longitudinal direction of the ship), and the motion characteristic is translational motion (swing+rotation). The aim of the control is to reduce the transverse and longitudinal swinging of the lifting hook and improve the construction operation efficiency.
The traditional nonlinear energy trap is a passive energy absorber, and consists of an auxiliary mass body and a nonlinear track, so that vibration of a fixed structure excited by impact can be reduced, but in a swinging structure, the vibration amplitude is overlarge, the reactive force of the vibration trap can point to a small direction, the vibration reduction effect is not obvious enough, and the vibration trap is difficult to meet complex vibration reduction or vibration suppression requirements.
Disclosure of Invention
In order to meet the above defects or improvement demands of the prior art, the invention provides a composite nonlinear energy trap vibration damper, and one of the purposes is to realize any direction of reaction force in a track composite mode, so that the composite nonlinear energy trap vibration damper can meet complex vibration damping requirements.
To achieve the above object, according to one aspect of the present invention, there is provided a composite nonlinear energy trap vibration damping device comprising: the device comprises a bottom plate, an X-direction nonlinear track, a Y-direction nonlinear track, a sphere and a baffle cover;
the X-direction nonlinear track and the Y-direction nonlinear track are respectively distributed along the X-axis and the Y-axis, and the centers of the X-direction nonlinear track and the Y-direction nonlinear track are vertically distributed along the Z-axis; both ends of the X-direction nonlinear track and both ends of the Y-direction nonlinear track are respectively provided with a blocking cover, and the interiors of the X-direction nonlinear track and the Y-direction nonlinear track are respectively provided with a sphere; the spheres can freely move in the corresponding X-direction nonlinear track and Y-direction nonlinear track, and the directions of normal force of the spheres at the corresponding positions of the X-direction nonlinear track and the Y-direction nonlinear track are functions of track slopes corresponding to the positions of the spheres respectively.
Another object of the present invention is to further enhance the damping effect in a limited space structure by means of multiple energy dissipation. In order to achieve the above purpose, further, a damping rubber is arranged on one side of each baffle cover facing the corresponding sphere.
Further, the X-direction nonlinear track and the Y-direction nonlinear track are made of metal, preferably copper; annular magnets are arranged on the radial direction of each sphere.
Further, the track curves of the X-direction nonlinear track and the Y-direction nonlinear track are circular functions or higher-order curves.
Further, the X-direction nonlinear track and the Y-direction nonlinear track are tubular tracks.
Further, the position of the baffle cover on the X-direction nonlinear track and/or the Y-direction nonlinear track can be adjusted.
Further, at least one end of the X-direction nonlinear track and/or the Y-direction nonlinear track is provided with a groove along the longitudinal section direction, the end is divided into a fork shape, and at least one row of first limiting holes are arranged at the fork-shaped part; the end face of the baffle cover corresponding to the end part is provided with an installation groove with a shape corresponding to the cross section of the fork-shaped part, and the side wall of the baffle cover is provided with at least one second limiting hole corresponding to the first limiting hole; the second limiting holes and the different first limiting holes are inserted through pins or bolts so as to adjust and fix the position of the retaining cover.
In general, the above technical solutions conceived by the present invention, compared with the prior art, can achieve the following beneficial effects:
1. the composite nonlinear energy trap vibration damper adopts two nonlinear tracks which are respectively arranged in an intersecting manner in the X and Y directions, and when two spheres respectively move on the respective tracks, the reaction force formed by theoretical composite can point to any direction in a three-dimensional space, so that the complex vibration damper can meet the requirement of the device in operation.
2. The two ends of the track are provided with the baffle covers fixed with damping rubber, the ball body moves to the end of the nonlinear track, and the ball body collides with the damping rubber arranged on the baffle covers, so that the secondary dissipation of energy is realized. The ability to dissipate twice is different depending on the damping properties of the damping rubber.
3. The ring magnets are embedded into the sphere, and when the sphere rolls on the metal track, a moving magnetic field is formed. When the moving magnetic field intersects with the metal/copper track, the magnetic induction line and the conductor (namely the metal/copper track) are mutually cut, so that eddy currents are generated in the metal/copper track, electromagnetic force generated by the eddy currents can be equivalent to viscous damping, and therefore energy is dissipated by utilizing electromagnetic effect, and re-dissipation of the energy is achieved.
4. The retaining cover is movable, so that the position of the retaining cover can be adjusted according to different use scenes or requirements, the moving range of the ball body can be adjusted, and the vibration reduction amplitude can be adjusted.
Drawings
FIG. 1 is a perspective view of a composite nonlinear energy trap vibration damping device of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a front view of FIG. 1;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
fig. 5 is a perspective view of the cover of fig. 4.
The same reference numbers are used throughout the drawings to reference like elements or structures, wherein:
the device comprises a 1-bottom plate, a 2-Y-direction nonlinear track, a 3-X-direction nonlinear track, a 4-Y-direction supporting seat, a 5-X-direction supporting seat, a 6-sphere, a 7-ring magnet, an 8-baffle cover, 9-damping rubber, a 10-groove, a 11-first limit hole, a 12-mounting groove and a 13-second limit hole.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1 to 4, a composite nonlinear energy trap vibration damping device of a preferred embodiment of the present invention includes: the base plate 1, the Y-direction nonlinear track 2, the X-direction nonlinear track 3, the Y-direction supporting seat 4, the X-direction supporting seat 5, the ball 6, the annular magnet 7, the baffle cover 8 and the damping rubber 9.
Referring to fig. 1 and 4, the cross section of the main body of the support seat 4 and 5 is trapezoidal, and a space is left at the center of the main body for fitting with the tubular rail, so that the nonlinear rail and the support seat are welded and fixed.
The two nonlinear tracks in this embodiment are tubular tracks, and are respectively arranged in the X and Y directions in a crossing manner. The X-direction nonlinear track 3 is arranged at the bottom layer, and the Y-direction nonlinear track 2 is arranged at the upper layer. The damping rubber of the present embodiment is preferably a high damping rubber, such as HDR. A blocking cover 8 fixed with high damping rubber is arranged at two ends of each track. When the two spheres 6 roll in the respective pipelines, the reaction force formed by theoretical recombination can point to any direction in the three-dimensional space, and the complex vibration reduction requirement of the device in operation can be met. When the ball 6 moves to the end of the nonlinear tracks 2 and 3, the ball collides with high damping rubber arranged on the retaining cover 8, and energy is secondarily dissipated (if the damping rubber 9 is not arranged, some energy can be dissipated due to collision, and the energy dissipation capacity is greatly enhanced after the damping rubber 9 is arranged). In addition, a ring magnet 7 (in this embodiment, a permanent magnet) is embedded in the sphere 6, and when the sphere 6 rolls in the metal pipe, a moving magnetic field is formed. The metal of this embodiment is copper, and when the moving magnetic field intersects the copper pipeline, the magnetic induction line and the conductor are caused to cut each other, so that an eddy current is generated in the copper pipeline, and the electromagnetic force generated by the eddy current can be equivalently a viscous damping, so that the electromagnetic effect is utilized to dissipate energy.
The reaction force of the ball on the track is transferred to the main structure to which the track is attached when the ball 6 rolls back and forth along the non-linear track. The direction of the normal force between the sphere and the rail is a function of the slope of the rail at each location where the sphere is located.
The track curve of the nonlinear track may employ a circular function, a 4-degree function curve, and higher-degree function curves.
Referring to fig. 1 and fig. 3 to 5, the nonlinear rails 2 and 3 are provided with first limiting holes 11 (threaded holes in this embodiment) at different corresponding positions of the tubular rail, and a groove 10 is formed at the vertical center plane of the pipe, so that the blocking cover 8 can be sleeved into the pipe to move through the mounting groove 12.
The baffle cover 8 of the embodiment is fixed on the nonlinear track through bolts, through holes are drilled on the baffle cover in the directions of 90 degrees and 270 degrees, second limiting holes 13 (threaded holes in the embodiment) are drilled on the side wall of the corresponding pipeline, and 2 bolts are used for installation and fixation. In order to ensure the stability of installation, the retaining cover is fixed by using 2 bolts, and 8 set screws are also required to be used for auxiliary fixation. The set screw is pressed with its end against or embedded in a part for fixing the position between the two parts (e.g. fixing the damping rubber 9). The retaining cap 8 can be mounted at different positions of the pipeline according to the first limiting hole 11.
In other embodiments, the shape of the nonlinear track is not limited to a tubular shape, and several nonlinear rods may be arranged according to the shape of the tubular track of the preferred embodiment to form the nonlinear track, or the tubular track of the preferred embodiment is replaced by a rod with the same shape as the central line of the tubular track, and a sphere is sleeved on the rod and slides along the rod, etc.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. A composite nonlinear energy trap vibration damping device, comprising: the device comprises a bottom plate (1), an X-direction nonlinear track (3), a Y-direction nonlinear track (2), an X-direction supporting seat (5), a Y-direction supporting seat (4), a sphere (6) and a baffle cover (8);
the X-direction nonlinear track (3) and the Y-direction nonlinear track (2) are respectively distributed along the X-axis and the Y-axis, are respectively fixed on the bottom plate (1) through the X-direction supporting seat (5) and the Y-direction supporting seat (4), and are vertically distributed along the Z-axis at the centers; both ends of the X-direction nonlinear track (3) and the Y-direction nonlinear track (2) are provided with baffle covers (8), and the inside is provided with spheres (6); the spheres (6) can freely move in the corresponding X-direction nonlinear tracks (3) and Y-direction nonlinear tracks (2), and the directions of normal forces of the spheres (6) at the positions of the corresponding X-direction nonlinear tracks (3) and Y-direction nonlinear tracks (2) are functions of track slopes corresponding to the positions of the spheres (6) respectively;
the X-direction nonlinear track (3) and the Y-direction nonlinear track (2) are made of metal, and annular magnets (7) are arranged in the radial direction of each sphere (6).
2. A composite non-linear energy trap vibration damping device according to claim 1, characterized in that the side of each cover (8) facing the corresponding sphere (6) is provided with damping rubber.
3. A composite non-linear energy well vibration damper according to claim 1, wherein the metal is copper.
4. A composite non-linear energy well vibration damper according to claim 1, wherein the trajectory curves of the X-direction non-linear track (3) and the Y-direction non-linear track (2) are circular functions or higher order curves.
5. A composite non-linear energy trap vibration damping device as claimed in claim 4, wherein the X-direction non-linear track (3) and the Y-direction non-linear track (2) are tubular tracks.
6. A composite non-linear energy trap vibration damping device as claimed in any one of claims 1 to 5, wherein the position of the cover (8) on the X-direction non-linear track (3) and/or the Y-direction non-linear track (2) is adjustable.
7. A composite nonlinear energy trap vibration damping device as claimed in claim 6, characterized in that at least one end of the X-direction nonlinear track (3) and/or the Y-direction nonlinear track (2) is provided with a groove (10) along the longitudinal section direction, dividing the end into a fork shape, and the fork-shaped part is provided with at least one row of first limiting holes (11); the end face of the baffle cover (8) corresponding to the end is provided with a mounting groove (12) with a shape corresponding to the cross section of the fork-shaped part, and the side wall of the baffle cover (8) is provided with at least one second limiting hole (13) corresponding to the first limiting hole (11); the second limiting holes (13) and the different first limiting holes (11) are inserted through pins or bolts so as to adjust and fix the position of the baffle cover (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811001108.7A CN108895114B (en) | 2018-08-30 | 2018-08-30 | Composite nonlinear energy trap vibration damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811001108.7A CN108895114B (en) | 2018-08-30 | 2018-08-30 | Composite nonlinear energy trap vibration damper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108895114A CN108895114A (en) | 2018-11-27 |
| CN108895114B true CN108895114B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811001108.7A Active CN108895114B (en) | 2018-08-30 | 2018-08-30 | Composite nonlinear energy trap vibration damper |
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| Country | Link |
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| CN (1) | CN108895114B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109505922B (en) * | 2018-11-26 | 2020-06-05 | 东北大学 | Multistable nonlinear energy trap with piecewise linear beam and permanent magnet negative stiffness |
| CN109404460B (en) * | 2018-12-06 | 2020-08-04 | 陕西理工大学 | Combined laminated friction damping vibration absorber under magnetic constraint |
| CN111720482A (en) * | 2020-06-18 | 2020-09-29 | 哈尔滨工程大学 | Three-dimensional coupling collision rail type nonlinear vibration damping device |
| CN113944819A (en) * | 2021-11-09 | 2022-01-18 | 同济大学 | Spherical magnetic particle type pipeline multidimensional vibration damper |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03169984A (en) * | 1989-11-28 | 1991-07-23 | Okumura Corp | Vibration controller of building |
| CN1136650A (en) * | 1995-01-19 | 1996-11-27 | 石川岛播磨重工业株式会社 | Vibration damper |
| US5934029A (en) * | 1997-05-16 | 1999-08-10 | Okumura Corporation | Base isolator having mutually eccentric rotators |
| CN1265723A (en) * | 1997-08-08 | 2000-09-06 | 鲁宾逊地震有限公司 | Energy absorber |
| CN209041424U (en) * | 2018-08-30 | 2019-06-28 | 华中科技大学 | A kind of composite non-linear energy wells vibration absorber |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100414569B1 (en) * | 2001-05-04 | 2004-01-07 | 재단법인서울대학교산학협력재단 | Directional Rolling Friction Pendulum Seismic Isolation System and Roller Assembly Unit for the System |
| US7237364B2 (en) * | 2004-07-02 | 2007-07-03 | Chong-Shien Tsai | Foundation shock eliminator |
-
2018
- 2018-08-30 CN CN201811001108.7A patent/CN108895114B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03169984A (en) * | 1989-11-28 | 1991-07-23 | Okumura Corp | Vibration controller of building |
| CN1136650A (en) * | 1995-01-19 | 1996-11-27 | 石川岛播磨重工业株式会社 | Vibration damper |
| US5934029A (en) * | 1997-05-16 | 1999-08-10 | Okumura Corporation | Base isolator having mutually eccentric rotators |
| CN1265723A (en) * | 1997-08-08 | 2000-09-06 | 鲁宾逊地震有限公司 | Energy absorber |
| CN209041424U (en) * | 2018-08-30 | 2019-06-28 | 华中科技大学 | A kind of composite non-linear energy wells vibration absorber |
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| Publication number | Publication date |
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| CN108895114A (en) | 2018-11-27 |
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