CN217733729U

CN217733729U - Bidirectional TMD vibration damper for multi-mode vibration control of riding sling

Info

Publication number: CN217733729U
Application number: CN202221817142.3U
Authority: CN
Inventors: 郝海飞; 史玉龙; 郝艳波; 刘涛; 崔依; 张小利; 张四化; 张子阳; 李胜利
Original assignee: Zhengzhou University; China Second Metallurgy Group Co Ltd
Current assignee: Zhengzhou University; China Second Metallurgy Group Co Ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-11-04
Anticipated expiration: 2032-07-15

Abstract

The utility model relates to a bidirectional TMD vibration damping device for multi-mode vibration control of a straddle type sling, which effectively solves the problems of insufficient vibration suppression, complex maintenance and high cost of the prior straddle type sling structure; the technical scheme comprises the following steps: the damping and buffering of vibration in two directions (horizontal and vertical) of the riding type sling can be realized by arranging the transverse TMD vibration damper and the vertical TMD vibration damper, the traditional oil damper is replaced by the high-damping hollow rubber cylinder, the single cost is far lower than that of the oil damper, the later-stage maintenance process is simplified (the maintenance is not required to be directly replaced once the maintenance is damaged), the cost is reduced, and the economical efficiency is good.

Description

Bidirectional TMD vibration damper for multi-mode vibration control of riding sling

Technical Field

The utility model belongs to the technical field of suspension bridge hoist cable damping, especially, relate to a two-way TMD vibration damper for riding straddle type hoist cable multi-mode vibration control.

Background

Along with the development of economy, the bridge construction career develops rapidly, a plurality of large-span suspension bridges appear, and many problems also appear when the suspension bridges are widely applied, the straddle type sling is an important structural form of a sling structure of the suspension bridge, four cable bodies are arranged in space, and the sling is of a flexible structure, has small mass and low damping, and is easy to vibrate under the actions of wind, rain, vehicle loads and the like, particularly the straddle type sling after ice is coated in a cold environment, the large vibration of the sling threatens the health of the cable bodies, the service life of the sling is shortened, and the suspension bridge has potential safety hazards;

at present, a method for inhibiting the vibration of a cable structure mainly comprises the steps of installing a damper, namely installing the damper (mostly an oil damper) on a cable, but the damping performance is greatly reduced due to the fact that the oil damper is in an outdoor harsh environment for a long time, the sealing performance of the oil damper is reduced (the rubber sealing ring is aged), further, internal oil is leaked, and finally, the damping function is lost;

the maintenance is difficult, the device needs to be detached, and the device is reinstalled after the maintenance is finished (time and labor are wasted, labor cost is consumed), or the device is directly replaced (consumable cost is increased), so that the cost is not saved;

in view of the above, we provide a bi-directional TMD damping device for multi-modal vibration control of a riding sling to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to the above situation, the utility model provides a two-way TMD vibration damper for riding straddle type hoist cable multimode vibration control, through setting up horizontal TMD vibration damper, vertical TMD vibration damper can realize the damping to riding two orientations of straddle type hoist cable (horizontal, vertical) and go up the vibration, the buffering, replace traditional oil damper through setting up high damping hollow rubber cylinder, single cost is far less than oil damper moreover, the maintenance process in later stage has been simplified (in case the damage need not the direct change of maintenance), the expenditure of cost has also been reduced, economic nature is good.

The utility model provides a two-way TMD vibration damper for riding straddle type hoist cable multimode vibration control, its characterized in that, first damping frame and first damping frame both ends that set up including two horizontal intervals are connected with the cable clamp respectively, the cable clamp is installed on riding straddle type hoist cable, fixedly connected with second damping frame between the first damping frame that two horizontal intervals set up, be equipped with horizontal TMD vibration damper on the first damping frame, be equipped with vertical TMD vibration damper on the second damping frame.

The beneficial effects of the technical scheme are as follows:

(1) According to the scheme, the TMD vibration reduction device formed by matching the mass block, the spring and the high-damping hollow rubber cylinder is arranged, so that large additional damping can be improved, the vibration of the sling rope is restrained, and the sling rope is prevented from fatigue damage;

(2) According to the scheme, the first vibration reduction frames arranged at transverse intervals, the second vibration reduction frames arranged longitudinally and the TMD vibration reduction devices arranged on the first vibration reduction frames are matched, so that the bidirectional (transverse and longitudinal) vibration of the sling can be reduced and buffered, and the defects in the aspect of vibration control of the existing straddle type sling are overcome;

(3) According to the scheme, the traditional oil damper is replaced by the high-damping rubber, once the high-damping rubber is damaged, the high-damping rubber is directly replaced (the unit price of the high-damping rubber is far lower than that of the oil damper), the later-stage maintenance process is simplified, the cost is reduced, and the economical efficiency is good.

Drawings

FIG. 1 is a schematic view of a straddle sling structure of the present invention;

FIG. 2 is a schematic view of the mounting structure of the TMD damping device of the present invention;

FIG. 3 is a schematic view of a partial structure of the TMD damping device of the present invention;

FIG. 4 is a schematic sectional view of the cover with a semicircular column shape according to the present invention;

fig. 5 is a state diagram of the two semicircular cylindrical covers spliced together.

Detailed Description

The foregoing and other technical matters, features and functions of the present invention will become more apparent from the following detailed description of the embodiments with reference to the attached drawings of fig. 1 to 5, wherein all structural matters mentioned in the following embodiments are referred to by the attached drawings of the specification.

Embodiment 1, this embodiment provides a two-way TMD damping device for multi-modal vibration control of a straddle-type sling 7, as shown in fig. 2, including two first damping frames 1 transversely spaced apart from each other, and two ends of the first damping frame 1 are respectively connected with cable clamps 2, as shown in fig. 1, the straddle-type sling 7 passes through the cable clamps 2 (the cable clamps 2 include two semicircular clamps, and the two semicircular clamps are directly and fixedly connected via bolts), the two semicircular clamps cooperate with the bolts to fix the cable clamps 2 on the straddle-type sling 7, as shown in fig. 1, the layout structure of the straddle-type sling 7 is generally that the four slings are spatially arranged, as shown in fig. 2, the four slings are omitted, the first damping frame 1 longitudinally disposed is fixedly connected between the two cable clamps 2 located on the same side, and a second damping frame 8 is fixedly connected at a middle position of the two first damping frames 1 (the second damping frame 8 fixedly connects the two first damping frames 1), two ends of the first damping frame 1 and the two damping clamps 2, and two ends of the second damping frame 8 are fixedly connected via welding;

the two first damping frames 1 are provided with transverse TMD damping devices, the second damping frame 8 is provided with a longitudinal TMD damping device, when the sling has large vibration displacement and generates vibration displacement along the transverse direction and the longitudinal direction, the transverse TMD damping devices and the longitudinal TMD damping devices can respectively realize transverse and longitudinal damping and buffering on the sling, so that transverse and longitudinal energy borne by the sling can be dissipated, and the transverse and longitudinal vibration of the sling can be suppressed;

the transverse TMD damping device and the longitudinal TMD damping device are arranged on the four suspension ropes which are arranged in space to form a damping system, and the bidirectional (transverse and longitudinal) vibration control of the four suspension ropes which are arranged in space can be realized.

Embodiment 2, on the basis of embodiment 1, as shown in fig. 2, the transverse TMD damping device includes a transverse mass block 5 (a hollow cylinder) slidably mounted and sleeved on the first damping frame 1, one side of the transverse mass block 5 facing the cable clamp 2 is connected with a transverse spring 4, and the other end of the transverse spring 4 is fixedly connected to the cable clamp 2 (screw holes are respectively formed at the connecting positions of the cable clamp 2 and the transverse mass block 5 with the two ends of the transverse spring 4), and the two ends of the transverse spring 4 are threaded and are fixedly connected through the screw holes formed in the cable clamp 2 and the transverse mass block 5, respectively (the screw holes are used for providing a mounting position for mounting the transverse spring 4);

the first damping frame is sleeved with the inherent transverse high-damping rubber 3, the transverse high-damping rubber 3 and the transverse mass block 5 are arranged at a certain distance (the distance is used for realizing that when the sling vibrates transversely, transverse vibration generated by the sling is reflected in a reciprocating mode through the transverse mass block 5 so as to be in contact with the transverse high-damping rubber 3 to dissipate vibration energy of the sling and suppress vibration of the sling), when the sling vibrates transversely and generates large displacement, the transverse mass block 5 can do reciprocating motion along the first damping frame 1 under the action of the transverse spring 4 and the transverse high-damping rubber 3, and the transverse mass block 5 and the transverse high-damping rubber 3 collide in the motion process (when the structure vibrates, part of vibration energy is dissipated through viscous internal friction between rubber molecular chains, the high-damping rubber has high equivalent viscous damping and high energy dissipation performance), so that the vibration energy is dissipated, the sling is restrained from continuing to vibrate, and the transverse spring 4 can play a role of buffering the movement of the transverse mass block 5, and further restraining the progress of vibration.

Embodiment 3, on the basis of embodiment 1, the longitudinal TMD damping device includes a longitudinal mass block 10 slidably mounted and sleeved on the second damping frame 8, one end of the longitudinal mass block 10 is connected to one of the first damping frames 1 through a longitudinal spring 11, screw holes are respectively provided at the connection positions of the longitudinal mass block 10, the first damping frame 1 and the longitudinal spring 11 (for connecting the longitudinal spring 11 to the longitudinal mass block 10 and the first damping frame 1 to provide the mounting position), and both ends of the longitudinal spring 11 are respectively provided with threads and respectively disposed in the screw holes corresponding thereto, so as to achieve the fixed connection with the longitudinal mass block 10 and the first damping frame 1;

when the sling generates longitudinal vibration, the longitudinal mass block 10 can move back and forth relative to the second vibration damping piece, so that the longitudinal mass block 10 can move back and forth along the longitudinal direction under the action of the longitudinal spring 11 and the longitudinal high-damping rubber 9, the process is the same as the action relation among the transverse mass block 5, the transverse spring 4 and the transverse high-damping rubber 3 when the sling generates vibration along the transverse direction, and excessive description is not given here, so that the effect of buffering and inhibiting the longitudinal vibration of the sling is realized.

Embodiment 4, on the basis of embodiment 1, as shown in fig. 2, a high damping rubber layer is installed in the cable clamp 2, so that the high damping rubber layer is in contact with the suspension cable penetrating through the cable clamp 2, and when the suspension cable generates vibration, the high damping rubber layer can primarily dissipate a part of the vibration energy.

In example 5, the first and second

vibration damping frames

1 and 8 are formed from steel columns in addition to example 1.

Embodiment 6, based on embodiments 1 to 5, two ends of a first vibration damping frame 1 are respectively provided with a transverse TMD vibration damping device, as shown in fig. 2, that is, two ends of the first vibration damping frame 1 are respectively provided with a set of transverse TMD vibration damping devices, including a transverse mass block 5, a transverse spring 4, and a transverse high damping rubber 3, which are matched with each other, when being set, the two transverse springs 4 arranged at two ends of the first vibration damping frame 1 have different elastic coefficients, so that when a sling generates vibration of different sizes in the transverse direction, the corresponding transverse springs 4 can play a better role in buffering and absorbing vibration energy;

if the energy of the vibration generated by the sling is less, the transverse spring 4 with the smaller elasticity coefficient, the transverse mass block 5 matched with the transverse spring 4 and the transverse high-damping rubber 3 mainly play roles in dissipating, absorbing and buffering the vibration energy of the sling (because the sling has small shaking amplitude and the vibration energy is smaller, the transverse spring 4 with the larger elasticity coefficient and the transverse mass block 5 connected with the transverse spring 4 cannot move along the first vibration damping frame 1, or the movement distance is smaller, and the effects of vibration damping and buffering of the sling in the current state cannot be achieved);

if the vibration energy generated by the sling is large, the transverse spring 4 with large elastic coefficient, the transverse mass block 5 matched with the transverse spring 4 and the transverse high-damping rubber 3 mainly play roles of dissipating, absorbing and buffering the vibration energy of the sling (because the sling has large shaking amplitude and large vibration energy, although the transverse spring 4 with small elastic coefficient and the transverse mass block 5 connected with the transverse spring 4 move along the first vibration damping frame 1, the transverse spring 4 with small elastic coefficient has obviously insufficient capability of suppressing the vibration of the sling, and the dissipating and suppressing force of the vibration energy of the sling is obviously weak), and the transverse spring 4 with large elastic coefficient and the transverse mass block 5 matched with the transverse spring 4 as main vibration damping and buffering execution units realize the vibration damping and buffering of the sling, so that the vibration control of the multi-mode sling (different vibration modes) can be realized.

Embodiment 7, on embodiment 6 basis, as shown in fig. 2, vertical high damping rubber 9, horizontal high damping rubber 3 make hollow cylinder, in order to be convenient for change it in the later stage, the accessible splices two semi-circular hollow cylinder into a complete hollow cylinder, when installing, at first with two semi-circular hollow cylinder joint respectively at the surface of damping frame and then splice into a complete cylinder, then through iron wire or other commonly used fixed mode with splice together two semi-circular hollow cylinder ligatures on the damping frame, annotate: the iron wire or the fixing piece fixed through other fixing modes should be far away from one end of the mass block, so that the mass block is prevented from touching the iron wire or other fixing pieces during reciprocating movement in the later period, and the dissipation and inhibition of vibration energy are influenced.

Embodiment 8, on the basis of embodiment 7, in the dashed-line frame region shown in fig. 3, a protective cover is provided, as shown in fig. 4, the protective cover is formed by splicing two matched semicircular cylindrical covers 12 (formed by processing polypropylene plastics), as shown in fig. 5, one ends of the two semicircular cylindrical covers 12, which are far away from the mass block, are fixedly connected by bolts, one ends of the two semicircular cylindrical covers 12, which are fixedly connected by bolts, are provided with a sealing shape, and the inner diameters of the two semicircular cylindrical covers are matched with the size of the vibration damping frame, so that the two semicircular cylindrical covers 12 can be fixed on the vibration damping frame after being spliced into a cylindrical cover, the high-damping rubber inside the two semicircular cylindrical covers can be protected to a certain extent, the damage of bad weather to the high-damping rubber (such as sunlight, acid-base rain water and the like) can be better avoided, the service life of the high-damping rubber is prolonged, and the high-damping rubber can be conveniently replaced and maintained (the later maintenance efficiency is improved) when the high-damping rubber needs to be replaced;

the above-described structure can also be provided on the second vibration damping mount 8 to protect the high damping rubber provided thereon.

The above description is only for the purpose of illustrating the present invention, and it should be understood that the present invention is not limited to the above embodiments, and various modifications conforming to the spirit of the present invention are within the scope of the present invention.

Claims

1. The utility model provides a two-way TMD vibration damper for riding straddle type hoist cable multimode vibration control, its characterized in that, first damping frame (1) and first damping frame (1) both ends that set up including two horizontal intervals are connected with cable clamp (2) respectively, cable clamp (2) are installed on riding straddle type hoist cable (7), fixedly connected with second damping frame (8) between first damping frame (1) that two horizontal intervals set up, be equipped with horizontal TMD vibration damper on first damping frame (1), be equipped with vertical TMD vibration damper on second damping frame (8).

2. The two-way TMD damper for multimodal vibration control of a straddle type sling according to claim 1, wherein the transverse TMD damper comprises a transverse mass block (5) slidably mounted and sleeved on the first damper frame (1), a transverse spring (4) is connected between the transverse mass block (5) and the cable clamp (2), an inherent transverse high damping rubber (3) is sleeved on the first damper frame (1) on the side of the transverse mass block (5) departing from the cable clamp (2) connected with the transverse mass block through the transverse spring (4), and the transverse high damping rubber (3) and the transverse mass block (5) are arranged at a certain distance.

3. The bi-directional TMD vibration damper for multi-modal vibration control of a straddle sling according to claim 1, wherein the longitudinal TMD vibration damper comprises a longitudinal mass block (10) slidably mounted and sleeved on a second vibration damping frame (8), one end of the longitudinal mass block (10) is connected with one of the first vibration damping frames (1) through a longitudinal spring (11), and the second vibration damping frame (8) is sleeved with a longitudinal high damping rubber (9) which is arranged at an interval with the longitudinal mass block (10).

4. The bi-directional TMD damping device for multimodal vibration control of a riding sling according to claim 1, wherein a highly damping rubber layer is mounted inside the rope clamp (2).

5. The bi-directional TMD damping device for straddle sling multi-modal vibration control according to claim 1, wherein the first and second damping frames (1, 8) are machined from steel columns.

6. The bi-directional TMD damping device for multi-modal vibration control of a straddle sling according to any one of claims 1 to 5, wherein two sets of transverse TMD damping devices are arranged on the first damping frame (1) at intervals and are respectively positioned at two ends of the first damping frame (1), and the two transverse springs (4) at the two ends have different elastic coefficients.

7. The bi-directional TMD damping device for multi-modal vibration control of a riding sling according to claim 6, wherein the longitudinal high damping rubber (9), the transverse high damping rubber (3) are made as hollow cylinders.

8. The bi-directional TMD damping device for multi-modal vibration control of a riding sling according to claim 7, wherein the first and second damping frames (1, 8) are detachably provided with protective covers corresponding to the high damping rubber.