CN212957069U

CN212957069U - TMD damping device with adjustable mass, rigidity and damping

Info

Publication number: CN212957069U
Application number: CN202021262316.5U
Authority: CN
Inventors: 吴红刚; 牌立芳; 庞伟军; 董占林; 张俊德
Original assignee: Northwest Research Institute Co Ltd of CREC
Current assignee: Northwest Research Institute Co Ltd of CREC
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-04-13
Anticipated expiration: 2030-06-30

Abstract

The utility model discloses a TMD damping device with adjustable mass, rigidity and damping, which comprises a frame, a conductor plate, a mass block and a permanent magnet, wherein the conductor plate, the mass block and the permanent magnet are arranged in the frame; a mass block with permanent magnets fixed around is arranged on the supporting plate; the guide rails which are arranged oppositely are horizontally fixed at the upper end of the guide shaft, a connecting rod is connected between the guide rails which are arranged oppositely in a sliding mode, a conductor plate is vertically fixed on the connecting rod, and the conductor plate is located on the periphery of the mass block. The TMD damping is controlled by changing the size of the conductor plate so as to adapt to the structural power parameters of the pedestrian bridge structure when vibrated, the compression spring is sleeved on the guide shaft, the instability problem does not exist, the length-diameter ratio of the compression spring is not limited, and the parameters of the compression spring can be adjusted through the nut. When the vibration takes place, the utility model discloses TMD can play effectual shock attenuation control effect to bridge structures.

Description

TMD damping device with adjustable mass, rigidity and damping

Technical Field

The utility model belongs to the technical field of bridge structures vibration control, especially, relate to a quality, rigidity, damping adjustable TMD damping device.

Background

In recent years, with the continuous development of urban economy in China, the construction of pedestrian bridges is developed towards the directions of large span, softness, fineness, attractiveness and structural diversification, but the pedestrian bridge structure has low natural vibration frequency and low damping, and the main load form is pedestrian load, so that the pedestrian vibration becomes a main factor influencing the pedestrian overpass structure, and therefore, how to improve the safety of the bridge structure under the pedestrian vibration becomes a hotspot of research.

A frequency modulation mass damper (TMD) is a passive vibration damping control system commonly used for bridge structures, and mainly comprises a mass block, a spring and a damping system, wherein the self-vibration frequency of the TMD is adjusted to be positioned near the fundamental frequency of a main structure as much as possible, so that the resonance characteristic of the structure is changed, and the aim of vibration damping is fulfilled. However, the dynamic parameters of the bridge structure change with time and under different crowd loads, the cadence between the TMD natural vibration frequency and the structural natural vibration frequency is inconsistent, so that the structural anti-seismic control effect is reduced. Therefore, the structure can be subjected to shock absorption control by adjusting the mass, the rigidity, the damping and the like of the TMD device, even if the dynamic parameters of the pedestrian bridge vibrate under the action of time change and pedestrian load change, the shock absorption control effect on the pedestrian bridge can be ensured, but the TMD shock absorption device with adjustable mass, rigidity and damping, which can effectively improve the shock absorption control effect of the bridge structure, is absent at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a quality, rigidity, damping adjustable TMD damping device reduce the vibration influence that pedestrian bridge dynamic parameter produced under the effect that time-varying and pedestrian load change, effectively improve the damping control effect of TMD to pedestrian bridge.

In order to achieve the above object, the utility model adopts the following technical scheme:

a TMD damping device with adjustable mass, rigidity and damping comprises a frame, a conductor plate arranged at the top of the frame, and a mass block and a permanent magnet which are arranged in the frame, wherein the frame comprises a bottom plate, a support plate, guide shafts and a guide rail, the bottom plate is vertically provided with a plurality of guide shafts with threads, the guide shafts penetrate through the support plate and enable the support plate to be arranged above the bottom plate through nuts, and a pressure spring is sleeved on the guide shafts between the bottom plate and the support plate; a mass block with adjustable height is arranged on a supporting plate in the frame, and the permanent magnet is fixed around the mass block; the upper end of the guide shaft is horizontally fixed with oppositely arranged guide rails, a connecting rod is connected between the oppositely arranged guide rails in a sliding manner, a conductor plate is vertically fixed on the connecting rod, and the conductor plate is positioned on the periphery of the mass block.

Preferably, the mass block is a multi-layer steel plate.

Preferably, the upper edge of the conductor plate is fixed on a connecting rod, and two ends of the connecting rod are slidably connected with the guide rail through pulleys.

Preferably, a plurality of threaded support rods are vertically fixed on a support plate in the frame, and the mass block is fixed on the support plate through the support rods.

Preferably, the number of the support rods is four, the four support rods are respectively arranged on four corners of a rectangle formed on the support plate, and the mass block is located between the four support rods.

Preferably, the number of the guide shafts is four, and the four guide shafts are respectively arranged on four corners of a rectangle formed on the bottom plate.

Preferably, the lower end of the pressure spring is fixed on the bottom plate in a welding mode, and the upper end of the pressure spring is supported at the bottom of the supporting plate.

Compare in prior art's shortcoming and not enough, the utility model discloses following beneficial effect has:

the utility model discloses set up the quality piece that adsorbs the permanent magnet in the frame, but the peripheral vertical conductor plate that sets up horizontal slip of quality piece, quality piece and permanent magnet are through the pressure spring up-and-down motion under the vibration effect, size control TMD damping through changing the conductor plate, structure power parameter when adapting to the pedestrian bridge structure and receive the vibrations, the pressure spring cover is established on the guide shaft, there is not the unstability problem, the draw ratio of pressure spring is unrestricted, adjust the pressure spring parameter through the nut, furthermore, the height of quality piece can be selected as required. When the vibration takes place, adjustable TMD plays certain shock attenuation control effect to the structure, and the motion of quality piece can make the conductor plate cut the magnetic induction line that the permanent magnet produced simultaneously, and then produces the electric energy to make the vibration energy of bridge turn into the electric energy, further improve the shock attenuation control effect of attenuator to the structure.

Drawings

Fig. 1 is a schematic view of a TMD damping device with adjustable mass, stiffness and damping provided by an embodiment of the present invention.

FIG. 2 is a schematic top view of the TMD damper of FIG. 1.

Fig. 3 is a schematic top view of another TMD damping device with adjustable mass, stiffness and damping according to an embodiment of the present invention.

In the figure: 1-a bottom plate; 2-a support plate; 3-a conductor plate; 4-a guide shaft; 5-a pressure spring; 6-supporting rods; 7-a nut; 8-a mass block; 9-a permanent magnet; 10-a guide rail; 11-a connecting rod; 12-cross bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-2, the utility model provides a quality, rigidity, damping adjustable TMD damping device, the device's frame includes bottom plate 1, backup pad 2, guide shaft 4 and guide rail 10, vertically sets up four screwed guide shafts 4 on the bottom plate 1, and the lower extreme of guide shaft 4 is fixed in respectively on the bottom plate forms the four corners of rectangle. The top of bottom plate 1 sets up backup pad 2, and backup pad 2 passes guide shaft 4 and is fixed in on the guide shaft 4 through nut 7, and the cover is equipped with pressure spring 5 on the guide shaft 4 between bottom plate 1 and the backup pad 2, and the lower extreme welded fastening of pressure spring 5 is on bottom plate 1, and the upper end supports in the bottom of backup pad 2, adjusts the rigidity size of pressure spring through nut 7 on the guide shaft 4 above backup pad 2. Set up quality piece 8 and permanent magnet 9 in the frame, vertical fixed four bracing pieces 6 that have the screw thread on backup pad 2 in the frame, four bracing pieces 6 set up respectively in backup pad 2 on the four corners of formation rectangle, quality piece 8 is fixed in between four bracing pieces 6 through nut 7, conductor plate 3 is located the top of quality piece 8, quality piece 8 is the multilayer steel sheet, can increase and decrease the steel sheet number of piles as required, thereby adjust the height of quality piece 8, be fixed with permanent magnet 9 around quality piece 8, the magnetic pole of permanent magnet 9 is the same on the same lateral wall of quality piece 8, permanent magnet 9 is fixed in on the steel sheet through self magnetic force absorption.

The upper end of four guide shafts 4 passes through the fixed relative guide rail 10 that sets up of nut 7 level, refer to fig. 2, the upper end of four guide shafts 4 passes through the fixed two relative guide rail 10 that set up of nut 7 level, sliding connection has connecting rod 11 between the guide rail 10 that sets up two relatively, pulley and the relative guide rail 10 sliding connection that sets up are passed through at the both ends of connecting rod 11, vertical fixed conductor board 3 and conductor board 3 are located the periphery of quality piece 8 on connecting rod 11, in this structure, fix permanent magnet 9 at two relative lateral wall of quality piece 8, set up conductor board 3 respectively in the periphery of the 8 both sides wall of quality piece both sides that are fixed with permanent magnet 9, the upper end of guide shaft 4 is provided with horizontal pole 12 with the adjacent both sides of the two relative guide rail 10 that set up. The other structure is as follows: four guide rails 10 of nut 7 level are passed through to the upper end of four guide shafts 4, four guide rails 10 meet in proper order end to end and form the rectangle, the upper end of four guide shafts 4 is located four corners departments that four guide rails 10 formed the rectangle respectively, refer to fig. 2, sliding connection has connecting rod 11 between the relative guide rail 10, pulley and relative guide rail 10 sliding connection are passed through at the both ends of connecting rod 11, vertical fixed conductor board 3 and conductor board 3 are located the periphery of quality piece 8 on connecting rod 11, in this structure, at the fixed permanent magnet 9 of the lateral wall of quality piece 8, conductor board 3 sets up the periphery at quality piece 8 respectively. The area of the conductor plate 3 for cutting the magnetic induction lines is adjusted by adjusting the position of the connecting rod 11 sliding on the guide rail 10.

The utility model discloses a theory of operation: set up a plurality of in the bridge construction the utility model discloses a TMD damping device, when the pedestrian bridge takes place the vibration, quality piece 8 turns into the vibration of quality piece 8 with the vibration of main structure through the effect of pressure spring 5 with permanent magnet 9 together, produces the electric energy through 3 cutting magnetic induction lines of conductor plate to produce the damping, make the bridge at the in-process dissipation energy of vibration, reach the purpose that reduces and control pedestrian bridge structural vibration.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A TMD damping device with adjustable mass, rigidity and damping is characterized by comprising a frame, a conductor plate arranged at the top of the frame, and a mass block and a permanent magnet which are arranged in the frame, wherein the frame comprises a bottom plate, a support plate, guide shafts and a guide rail, a plurality of guide shafts with threads are vertically arranged on the bottom plate, the guide shafts penetrate through the support plate and enable the support plate to be arranged above the bottom plate through nuts, and a pressure spring is sleeved on the guide shaft between the bottom plate and the support plate; a mass block with adjustable height is arranged on a supporting plate in the frame, and the permanent magnet is fixed around the mass block; the upper end of the guide shaft is horizontally fixed with oppositely arranged guide rails, a connecting rod is connected between the oppositely arranged guide rails in a sliding manner, a conductor plate is vertically fixed on the connecting rod, and the conductor plate is positioned on the periphery of the mass block.

2. The TMD damping device with adjustable mass, stiffness, and damping of claim 1, wherein the mass is a multi-layered steel plate.

3. The TMD damping device with adjustable mass, stiffness and damping of claim 1, wherein the upper edge of the conductive plate is fixed to a connecting rod, and both ends of the connecting rod are slidably connected to the guide rails through pulleys.

4. The TMD damping device with adjustable mass, stiffness, and damping of claim 1, wherein a plurality of threaded support rods are vertically fixed on a support plate inside the frame, and the mass is fixed on the support plate through the support rods.

5. The TMD damping device with adjustable mass, stiffness and damping of claim 4, wherein the number of the supporting rods is four, and the four supporting rods are respectively arranged on four corners of a rectangle formed on the supporting plate, and the mass block is arranged between the four supporting rods.

6. The TMD damping device with adjustable mass, stiffness and damping of claim 1, wherein four guide shafts are provided, each being disposed at four corners of a rectangle formed on the bottom plate.

7. The TMD shock absorber with adjustable mass, stiffness and damping of claim 1, wherein the lower end of the compression spring is welded and fixed on the bottom plate, and the upper end is supported on the bottom of the supporting plate.