CN107355022B

CN107355022B - Two-way suspension mass pendulum vibration reduction system

Info

Publication number: CN107355022B
Application number: CN201710584641.XA
Authority: CN
Inventors: 霍林生; 黄辰
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2017-07-18
Filing date: 2017-07-18
Publication date: 2022-12-27
Anticipated expiration: 2037-07-18
Also published as: CN107355022A

Abstract

The invention belongs to the technical field of vibration reduction of civil engineering building structures, and provides a bidirectional suspension mass pendulum vibration reduction system. A bidirectional suspension mass pendulum vibration reduction system is composed of a pendulum ball, a cycloid, a sliding support, a semi-annular retaining plate, a baffle, a retaining plate, a connecting rod and a bottom plate. Compared with the traditional mass pendulum, the suspension type mass pendulum is additionally provided with the sliding support, and the problem that the traditional suspension mass pendulum only has single frequency is solved. By utilizing the designed sliding support, the suspension mass pendulum has different effective pendulum lengths in two directions of a horizontal plane, so that the pendulum has different frequencies, and the vibration of a building structure in different directions is better controlled.

Description

Two-way suspension mass pendulum vibration reduction system

Technical Field

The invention belongs to the technical field of vibration reduction of civil engineering building structures, and provides a bidirectional suspension mass pendulum vibration reduction system.

Background

For many practical building structures, excessive dynamic response can cause many hidden dangers to the safety and the use function of the structure, and the normal work of the structure is influenced. The structural vibration control is a method for solving the problems, and the suspension mass pendulum vibration reduction system is used as a passive control system, has the advantages of good vibration reduction effect, simple principle and convenient installation, and is more and more valued by people. Suspension mass pendulums have been widely used in practical engineering, with the frequency being determined by pendulum length. The vibration frequency of the suspended mass pendulum is typically tuned to be the same or close to the first order natural frequency of vibration of the structure to reduce the dynamic response of the structure.

But the frequencies in different directions tend to be different for building structures. The suspension mass pendulum is a frequency-sensitive vibration damping device, and if the traditional suspension mass pendulum is used for vibration control, the vibration of the structure in a certain direction can be only controlled due to the unicity of the self frequency, and the problem of bidirectional vibration damping control of the structure cannot be well solved.

Disclosure of Invention

In order to solve the problems, the invention provides a bidirectional suspension mass pendulum vibration damping system, which utilizes a designed sliding support to enable the suspension mass pendulum to have different effective pendulum lengths in two directions of a horizontal plane, so that the pendulum has different frequencies and is better suitable for the frequencies of building structures in different directions.

The technical scheme of the invention is as follows:

a bidirectional suspension mass pendulum vibration reduction system comprises a mass ball, a cycloid, a sliding support, a baffle, a connecting rod and a bottom plate; the mass ball is fixed on the bottom plate through a cycloid, and the cycloid penetrates through the sliding support; the two baffles are fixed on the bottom plate through connecting rods, and the baffles are provided with slideways; the sliding support slides on the baffle, and a through hole is formed in the middle of the sliding support and is used for the cycloid to pass through;

the direction of the baffle is the y-axis direction, and the direction vertical to the baffle is the x-axis direction; the swing of the cycloid in the y-axis direction is not limited, and the length from the bottom plate to the mass ball is the effective swing length L, the value of which is determined by the formula (1), wherein f _y Is the frequency of the structure being controlled in the y-direction;

the length from the sliding support to the mass ball is the effective pendulum length L' due to the blocking of the cycloid by the sliding support in the x-axis direction, and the value is determined by the formula (2), wherein f _x Is the frequency of the structure being controlled in the x-axis direction;

the sliding support and the baffle slide in a rolling mode, namely, the retaining plate is a 'n' -shaped plate, round holes for placing balls are formed in the retaining plate, and the diameter of each round hole is smaller than that of each ball.

The through hole on the sliding support is formed by two semicircular retaining plates, the inner sides of the semicircular retaining plates are clamping grooves, and the balls are limited in the clamping grooves.

The invention has the beneficial effects that: the invention solves the problem that the traditional suspension mass pendulum vibration reduction system only has single frequency. In actual engineering, due to the unicity of the suspension mass pendulum frequency, the vibration of the structure in a certain direction can be controlled. By utilizing the designed sliding support, the pendulum has different effective pendulum lengths in two directions of a horizontal plane, so that the pendulum has different frequencies, and the vibration of the structure in different directions is better controlled.

Drawings

FIG. 1 is an overall view of the bi-directional suspended mass pendulum damping system of the present invention.

FIG. 2 is a perspective view of the bi-directional suspended mass pendulum vibration reduction system of the present invention.

FIG. 3 is a front view of the bi-directional suspended mass pendulum vibration reduction system of the present invention.

FIG. 4 is a left side view of the bi-directional suspended mass pendulum damping system of the present invention.

Fig. 5 is a structural view of the shoe.

Fig. 6 is a structural view of the semi-annular retainer plate.

Fig. 7 is a structural view of the holding plate.

In the figure: 1, swinging a ball; 2, cycloid; 3, sliding a support; 4 a semi-annular retaining plate; 5, a baffle plate; 6 a holding plate; 7 connecting rods; 8, a bottom plate; 9 bolt holes.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

A bidirectional suspension mass pendulum vibration damping system comprises a mass ball 1, a cycloid 2, a sliding support 3, a semi-annular retaining plate 4, a baffle 5, a retaining plate 6, a connecting rod 7 and a bottom plate 8.

The overall schematic view, the front view and the left view of the invention are shown in figures 1-4, and the structure of the sliding support is shown in figure 5. A retaining plate 6 is mounted in a track on the outside of the shoe 3 and provided with balls to allow the shoe 3 to slide freely on the track of the baffle 5. The two sliding supports are connected by adopting bolts and fixed on the specific position of the cycloid 2, so that the sliding supports 3 are ensured to slide only along the y-axis direction, and the pendulum has different effective pendulum lengths in the x-axis and y-axis directions. In order to reduce the friction between the cycloid 2 and the edge of the sliding support 3 and prolong the service life of the cycloid 2, two semi-annular retaining plates 4 are arranged at the edge of the cycloid 2, which is in friction with the sliding support 3, and balls are arranged on the semi-annular retaining plates 4. And one end of the connecting rod 7 is welded on the baffle 5, and the other end of the connecting rod is welded on the bottom plate 8, so that the baffle 5 is fixed in the using process. In order to enable the cycloid 2 to be fixed and swing better, the cycloid 2 is made of flexible steel stranded wires, one end of each steel stranded wire is welded at the central point of the bottom plate 8, the other end of each steel stranded wire penetrates through a square ring at the upper part of the mass ball 1 to be knotted and is fixed by an aluminum alloy pressing sleeve ring, and therefore the cycloid 2 can be enabled to play a role stably; bolt holes 9 are drilled on the periphery of the bottom plate 8, and the bottom plate 8 can be fixed on a structure to be controlled through bolts, so that the whole suspension mass pendulum system is stably hung on the structure.

The semi-annular holding plate 4 has a structure as shown in fig. 6, in which balls are inserted through openings at both ends and can freely rotate in the semi-annular holding plate 4. The two semi-annular retainer plates 4 are connected and fixed to the shoe 3 with bolts. The retainer plate 6 is constructed as shown in fig. 7, and the diameter of the retainer ring is slightly smaller than that of the balls, thus ensuring that the balls do not fall off. The holding plate 6 is fixed to the upper part of the rail outside the shoe 3 by bolts. The plates are lubricated on all the balls to reduce friction.

The specific installation mode of the invention is as follows: firstly, one end of a cycloid 2 penetrates through a square ring at the upper part of a mass ball 1 and is fixed by an aluminum alloy pressing collar, and the other end of the cycloid is welded on the center of a bottom plate 8; then, two sliding supports 3 and a semi-annular retaining plate 4 are connected and fixed to a specific position of the cycloid 2 by bolts, and the other end of the two sliding supports is arranged on a track of a baffle plate 5; then the baffle 5 is welded on the bottom plate 8 through a connecting rod 7; finally, the base plate 8 is bolted to the structure to which the suspended mass pendulum is to be mounted.

As shown in fig. 3 and 4, the effective pendulum length of the suspended mass pendulum in the y-axis direction is L, and the value thereof is determined by formula (1), where f _y Is the frequency of the structure being controlled in the y-direction.

The effective pendulum length in the x-axis direction is L', the value of which is determined by equation (2), where f _x Is the frequency of the structure being controlled in the x-direction.

The advantages of the invention can be summarized as follows: the effective pendulum length of the suspended mass pendulum in different directions can be changed, the problem that the traditional suspended mass pendulum only has single frequency is solved, and the vibration of the structure in different directions is better controlled. The structure is simple, the manufacturing and mounting processes are simple, the applicability is strong, the maintenance is convenient, and the bidirectional vibration damping control device can play a good role in the bidirectional vibration damping control of the building structure.

Claims

1. A bidirectional suspension mass pendulum damping system is characterized in that the suspension mass pendulum damping system comprises a mass ball (1), a cycloid (2), a sliding support (3), a baffle (5), a connecting rod (7) and a bottom plate (8); the mass ball (1) is fixed on the bottom plate (8) through the cycloid (2), and the cycloid (2) penetrates through the sliding support (3); the two baffles (5) are fixed on the bottom plate (8) through connecting rods (7), and the baffles (5) are provided with slideways; one end of the connecting rod (7) is welded on the baffle (5), and the other end is welded on the bottom plate (8); the sliding support (3) slides on the baffle (5), a through hole is formed in the middle of the sliding support (3), and the cycloid (2) penetrates through the through hole; the through hole on the sliding support (3) is formed by two semi-annular retaining plates (4), the inner sides of the semi-annular retaining plates (4) are clamping grooves, and the balls are limited in the clamping grooves;

the sliding support (3) and the baffle (5) slide in a rolling mode, and the retaining plate (6) is fixed on the inner top wall of the track on the outer side of the sliding support (3) through bolts; the holding plate (6) is a 'n' -shaped plate, round holes for placing the balls are formed in the holding plate (6), and the diameter of each round hole is smaller than that of each ball;

the direction of the baffle (5) is the y-axis direction, and the direction vertical to the baffle (5) is the x-axis direction; the swing of the cycloid (2) in the y-axis direction is not limited, and the length from the base plate (8) to the mass ball (1) is the effective swing length L, and the value is determined by the formula (1), wherein f _y Is the frequency of the structure being controlled in the y-direction;

the length from the sliding support (3) to the mass ball (1) is the effective pendulum length L' in the x-axis direction due to the blocking of the cycloid (2) by the sliding support (3), the value of which is determined by the formula (2), wherein f _x Is the frequency of the structure being controlled in the x-axis direction;