CN108895114B - Composite nonlinear energy trap vibration damper - Google Patents

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

A composite nonlinear energy trap vibration reduction device

Technical field

The invention belongs to the field of swing suppression of crane ship hoisting system, wind resistance and earthquake resistance of buildings and bridges. More specifically, it relates to a composite nonlinear energy trap vibration reduction device, which uses a passive control system to reduce the need for input of external energy. In this case, the control force is provided through the interaction between the swing suppression device and the controlled device/structure to achieve the purpose of suppressing the swing of the hanging object system or reducing the vibration of the structure.

Background technique

When an engineering ship is used for installation and construction operations under complex sea conditions, the amplitude of forced vibration generated by the hook is too large. On the engineering ship, the measured swing amplitude of the hook reaches plus or minus 10 meters (swinging along the transverse and longitudinal direction of the ship), and the movement The characteristic is translation (pendulum + rotation). The goal that needs to be controlled is to reduce the horizontal and vertical swing of the hook and improve the efficiency of construction operations.

The traditional nonlinear energy trap is a passive energy absorber, consisting of an auxiliary mass body and a nonlinear track, which can reduce the vibration of a fixed structure stimulated by impact. However, in a swing structure, the vibration amplitude is too large, and its reaction is There are few directions in which the force can be directed, and the vibration reduction effect is not significant enough, making it difficult to apply to complex vibration reduction or swing suppression requirements.

Contents of the invention

In view of the above defects or improvement needs of the prior art, the present invention provides a composite nonlinear energy well vibration damping device. One of its purposes is to realize any direction of the reaction force through orbital compounding, so that it can be applied to complex vibrations. Vibration reduction requirements.

In order to achieve the above object, according to one aspect of the present invention, a composite nonlinear energy well vibration damping device is provided, including: a base plate, an X-direction nonlinear track, a Y-direction nonlinear track, a sphere and a blocking cover;

The X-direction non-linear track and Y-direction non-linear track are distributed along the X-axis and Y-axis directions respectively, and their centers are distributed up and down along the Z-axis; both ends of the X-direction non-linear track and Y-direction non-linear track are equipped with stops Cover, and there are spheres inside; each sphere can move freely in the corresponding X-direction nonlinear orbit and Y-direction nonlinear orbit, and each sphere is in each position of the corresponding X-direction nonlinear orbit and Y-direction nonlinear orbit The direction of the normal force at is a function of the corresponding orbital slope at each position of the sphere.

Another object of the present invention is to further improve the vibration damping effect within a limited space structure through multiple energy dissipation methods. In order to achieve the above object, further, each blocking cover is provided with damping rubber on the side facing the corresponding sphere.

Furthermore, both the X-direction nonlinear track and the Y-direction nonlinear track are made of metal, preferably, the metal is copper; each sphere is provided with annular magnets in the radial direction.

Further, the trajectory curves of the X-direction nonlinear orbit and the Y-direction nonlinear orbit are circular functions or higher-order curves.

Furthermore, both the X-direction nonlinear track and the Y-direction nonlinear track are tubular tracks.

Furthermore, the position of the blocking cover on the X-direction non-linear track and/or the Y-direction non-linear track is adjustable.

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, and the end is divided into a fork shape, and the fork-shaped portion is provided with at least one row of first limits. position hole; the end surface of the blocking cover corresponding to the end is provided with a mounting groove corresponding to the cross section of the fork-shaped part, and the side wall of the blocking cover is provided with at least one second limit corresponding to the first limiting hole. position holes; insert pins or bolts into the second limit holes and different first limit holes to adjust and fix the position of the cover.

Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

1. The composite nonlinear energy well vibration damping device uses two nonlinear rails arranged crosswise in the X and Y directions. When the two spheres move on their respective rails, the theoretically composite reaction force can be directed in three dimensions. Any direction in space can meet the complex vibration reduction requirements of the device during operation.

2. Damping rubber-fixed baffles are installed at both ends of the track. When the sphere moves to the end of the nonlinear track, the sphere collides with the damping rubber installed on the baffle, achieving secondary dissipation of energy. Depending on the damping performance of the damping rubber, the ability to dissipate energy twice is different.

3. The ring magnet is embedded in the sphere. When the sphere rolls on the metal track, a moving magnetic field will be formed. When the moving magnetic field intersects the metal/copper track, the magnetic induction lines and the conductor (i.e. the metal/copper track) cut each other, thereby generating eddy currents in the metal/copper track. The electromagnetic force generated by the eddy current can be equivalent to a viscous damping , thereby using the electromagnetic effect to dissipate energy and achieve energy dissipation again.

4. The cover is movable, so that the position of the cover can be adjusted according to different usage scenarios or requirements, thereby adjusting the movement range of the sphere and thereby adjusting the vibration damping amplitude.

Description of the drawings

Figure 1 is a perspective view of the composite nonlinear energy trap vibration damping device of the present invention;

Figure 2 is a top view of Figure 1;

Figure 3 is a front view of Figure 1;

Figure 4 is a cross-sectional view along line A-A of Figure 3;

FIG. 5 is a perspective view of the cover in FIG. 4 .

Throughout the drawings, the same reference numbers refer to the same elements or structures, wherein:

1-Base plate, 2-Y-direction non-linear track, 3-X-direction non-linear track, 4-Y-direction support seat, 5-X-direction support seat, 6-Sphere, 7-Ring magnet, 8-Block cover, 9- Damping rubber, 10-groove, 11-first limit hole, 12-installation groove, 13-second limit hole.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in Figures 1 to 4, the composite nonlinear energy well vibration damping device in the preferred embodiment of the present invention includes: base plate 1, Y-direction nonlinear track 2, X-direction nonlinear track 3, Y-direction support base 4, To the support base 5, ball 6, ring magnet 7, cover 8 and damping rubber 9.

Please refer to Figures 1 and 4. The cross-section of the main part of the support seats 4 and 5 is designed to be trapezoidal, with a space in the center that fits the tubular track, and the non-linear track and the support seat are welded and fixed.

The two nonlinear rails in this embodiment are both tubular rails and are arranged crosswise in the X and Y directions respectively. The X-direction non-linear track 3 is arranged on the bottom floor, and the Y-direction non-linear track 2 is arranged on the upper level. The damping rubber in this embodiment is preferably high damping rubber, such as HDR. Stoppers 8 fixed with high damping rubber are installed at both ends of each track. When the two spheres 6 roll in their respective pipes, the theoretically combined reaction force can point in any direction in the three-dimensional space, which can meet the complex vibration reduction requirements of the device during operation. When the sphere 6 moves to the ends of the nonlinear tracks 2 and 3, it collides with the high-damping rubber installed on the cover 8, dissipating energy twice (if the damping rubber 9 is not provided, the collision can also dissipate some energy, set Damping rubber 9 will then greatly enhance energy dissipation capabilities). In addition, the annular magnet 7 (permanent magnet in this embodiment) is embedded in the sphere 6. When the sphere 6 rolls in the metal pipe, a moving magnetic field will be formed. The metal in this embodiment is copper. When the moving magnetic field intersects the copper pipe, the magnetic field lines and the conductor are cut into each other, thereby generating eddy currents in the copper pipe. The electromagnetic force generated by the eddy current can be equivalent to a viscous Damping, whereby electromagnetic effects are used to dissipate energy.

When the ball 6 rolls back and forth along the non-linear track, the reaction force of the ball on the track is transferred to the main structure to which the track is attached. The direction of the normal force between the sphere and the orbit is a function of the slope of the orbit at each position of the sphere.

The orbit curve of the nonlinear orbit can adopt circular function, 4th degree function curve and higher degree function curve.

Please refer to Figures 1 and 3 to 5. In the non-linear rails 2 and 3, first limiting holes 11 (threaded holes in this embodiment) are drilled at different corresponding positions of the tubular rails. The vertical center plane position of the pipe, A groove 10 is opened so that the cover 8 can be inserted into the pipe through the installation groove 12 for movement.

The blocking cover 8 in this embodiment is fixed on the non-linear track through bolts. In the directions of 90 degrees and 270 degrees, through holes are drilled in the blocking cover, and a second limiting hole 13 (threaded hole in this embodiment) is drilled in the side wall of the corresponding pipe. ), use 2 bolts for installation and fixation. In order to ensure the stability of the installation, in addition to using 2 bolts to fix the cover, 8 setscrews are also needed to assist in fixing. The set screw presses or embeds a part with its end to fix the position between two parts (for example, fixing the damping rubber 9). The blocking cover 8 can be installed at different positions of the pipeline depending on the first limiting hole 11 used.

In other embodiments, the shape of the nonlinear track is not limited to tubular. Several nonlinear rods may be arranged according to the shape of the tubular track of the preferred embodiment to form a nonlinear track, or the tubular track of the preferred embodiment may be Instead of a rod with the same shape as its center line, the sphere is sleeved on the rod and slides along the rod, etc.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements, etc., made within the spirit and principles of the present invention, All should be included in the protection scope of the present 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).