CN221840696U - Dynamic characteristic testing device of double-cable coupling system with damper - Google Patents

Abstract

The utility model relates to a dynamic characteristic testing device of a double-rope coupling system with a damper, which comprises a self-balancing frame, a inhaul cable, a connecting unit between ropes, a vibration exciter, the damper and a dynamic characteristic detector. The self-balancing frame is provided with an upper beam and a lower beam; the two groups of inhaul cables are fixedly arranged on the self-balancing frame in a penetrating way and positioned between an upper cross beam and a lower cross beam of the self-balancing frame; the inter-cable connecting unit is positioned between the two groups of inhaul cables and used for connecting the two groups of inhaul cables; the vibration exciter is arranged on the upper beam or the lower beam of the self-balancing frame, and the output end of the vibration exciter is connected with a group of inhaul cables; the two dampers are respectively fixed on an upper beam and a lower beam of the self-balancing frame, and the connecting ends of the two dampers are respectively correspondingly connected with the two groups of inhaul cables; the two detection ends of the dynamic characteristic detector are respectively and correspondingly connected with the two groups of inhaul cables. According to the dynamic characteristic testing device, a double-rope coupling structure is formed in the self-balancing frame, and the dynamic characteristic detector is used for detecting relevant parameters of the vibration of the inhaul cable, so that the dynamic characteristic testing of the double-rope coupling system is realized.

Description

A dynamic characteristics test device for a double-cable coupling system with a damper

Technical Field

The utility model relates to the technical field of civil engineering dynamic tests, in particular to a double-cable coupling system dynamic characteristic test device with a damper.

Background Art

The hanger is an important component of the suspension bridge and bears a large tensile force. With the increase of the main span of the suspension bridge, the vibration problem of the hanger has become increasingly prominent. The hangers of many completed suspension bridges have experienced large vibrations, resulting in damage or breakage of the hangers. The vibration problem of the bridge cable structure has brought huge economic losses to the society, and even endangered people's lives and property in serious cases. Therefore, effectively suppressing the vibration of the cable structure is of great significance to ensuring the structural safety of cable-bearing bridges. It is one of the key issues in the development of large-span bridges and has aroused widespread concern in the society.

The same suspension point of a suspension bridge usually contains two or more hangers. In order to suppress the vibration of the hanger, a rubber damper is usually installed at the end of the hanger, and a vibration-damping frame is used to couple the two hangers into a whole. This double-cable coupling system with dampers is widely used in long-span suspension bridges.

The core content of studying the dynamic characteristics of the double-cable coupling system with dampers is to accurately obtain the natural frequency and damping ratio of the system. How to design a test device to study the influence of different cable forces, cable lengths, vibration damping frame positions, stiffness, damping size, damping position and other parameters on the vibration characteristics of the double-cable coupling system with dampers is of great significance for guiding the setting of suspension bridge hanger vibration damping frames and dampers, and evaluating the rationality of suspension bridge vibration reduction design.

It has the following technical problems:

At present, university or enterprise laboratories are usually equipped with test and teaching equipment for testing the dynamic characteristics of a single cable without a damper, but are not equipped with test and teaching equipment specifically for testing the dynamic characteristics of a double-cable coupling system with a damper, which cannot meet the scientific research and teaching work in the direction of suspension bridge hanger vibration control.

Utility Model Content

Based on this, the purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a dynamic characteristic testing device for a double-cable coupling system with a damper.

The utility model provides a double-cable coupling system dynamic characteristics testing device with a damper, comprising:

A self-balancing frame, a dynamic characteristics detector, a cable connection unit, an exciter, two dampers and two sets of cables;

The self-balancing frame is provided with an upper crossbeam and a lower crossbeam, and two beam holes are respectively provided on the longitudinal beams on both sides;

The two groups of cables are fixed to the self-balancing frame through the beam holes and are located between the upper beam and the lower beam of the self-balancing frame;

The inter-cable connecting unit is located between the two groups of cables and is used to connect the two groups of cables;

The exciter is arranged on the upper beam or the lower beam of the self-balancing frame, and the output end of the exciter is connected to a group of the cables;

The two dampers are respectively fixed to the upper beam and the lower beam of the self-balancing frame, and the connecting ends of the two dampers are respectively connected to the two groups of cables;

The dynamic characteristic detector is provided with two detection ends, and the two detection ends are respectively connected to the two groups of cables.

Furthermore, the bottoms of the two dampers and the exciter are each provided with a mounting member, and the mounting member can be slidably mounted on an upper beam or a lower beam of the self-balancing frame.

Furthermore, the mounting member includes a mounting plate and a positioning plate, the mounting plate is fixedly connected to the positioning plate by bolts, an accommodating space is formed between the mounting plate and the positioning plate, the accommodating space is used to mount the upper beam or lower beam of the self-balancing frame, and the mounting plate is used to install the damper or the exciter.

Furthermore, the cable connection unit includes a hollow circular tube and a threaded thin rod, the inner side of the hollow circular tube is provided with a thread, one end of the hollow circular tube is provided with a cable limit buckle connected to the cable, the other end of the hollow circular tube is fixedly connected to one end of the threaded thin rod by a thread, and the other end of the threaded thin rod is provided with the cable limit buckle.

Furthermore, the cable limiting buckle includes two clamping plates arranged opposite to each other, the two ends of the two clamping plates are correspondingly connected by bolts, an arc-shaped protrusion is formed in the middle of the clamping plate, and a limiting space is formed between the two clamping plates, and the limiting space is used to clamp and fix the cable.

Furthermore, a tensioning anchoring pressure measuring unit is provided at the connection between the two groups of cables and the longitudinal beam of one side of the self-balancing frame. The tensioning anchoring pressure measuring unit includes a pressure tester and an oil pump, and a through-type pressure sensor, a hydraulic jack and a single-hole anchor which are sequentially sleeved on the cables. Isolation gaskets are sleeved on both sides of the through-type pressure sensor to separate the self-balancing frame and the hydraulic jack. The pressure tester is electrically connected to the through-type pressure sensor, and the oil pump is connected to the hydraulic jack through an oil pipe.

Furthermore, an anchoring adjustment unit is provided at the connection between the two groups of cables and the longitudinal beam on the other side of the self-balancing frame, and the anchoring adjustment unit includes a three-hole anchor, a fine-tuning nut, a mounting gasket and two threaded rods, the mounting gasket is sleeved on the cables, the two threaded rods are located on opposite sides of the cables, one end of the threaded rod is fixedly connected to the mounting gasket, the three holes of the three-hole anchor are respectively sleeved on the cables and the two threaded rods, the fine-tuning nut is threadedly sleeved on the threaded rod and abuts against the side of the three-hole anchor close to the mounting gasket.

Furthermore, the self-balancing frame includes a left sub-frame and a right sub-frame, the upper beam and the lower beam of the left sub-frame can be telescopically embedded in the upper beam and the lower beam of the right sub-frame respectively, the upper beam and the lower beam of the left sub-frame and the upper beam and the lower beam of the right sub-frame are evenly spaced and correspondingly provided with threaded through holes, and the left sub-frame and the right sub-frame are fixed by bolt connection.

Furthermore, an enlarged base is provided at the bottom of the self-balancing frame.

Compared with the prior art, the beneficial effects of the double-cable coupling system dynamic characteristics testing device with a damper of the utility model are as follows:

1. The utility model is a double-cable coupling system dynamic characteristic test device with a damper. By forming a double-cable coupling structure in a self-balancing frame, and arranging dampers and exciters on the upper and lower beams of the self-balancing frame, the dynamic characteristic detector detects the relevant parameters of the cable vibration, thereby realizing the dynamic characteristic test of the double-cable coupling system.

2. The utility model provides a double-cable coupling system dynamic characteristic testing device with a damper, and can set a cable connection device at any position within the anchoring interval of two groups of cables to satisfy the requirement of applying coupling constraints to any position of the two cables.

3. The utility model is a double-cable coupling system dynamic characteristic test device with dampers, which can simultaneously set dampers for two groups of cables. The dampers and exciters are stably fixed on the upper and lower beams of the retractable self-balancing frame, and the positions can be adjusted arbitrarily, thereby satisfying the requirements of applying damping and excitation to any positions of the two cables.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a dual-cable coupling system dynamic characteristics test device with a damper according to the present invention;

FIG2 is a schematic structural diagram of the self-balancing frame of FIG1 ;

FIG3 is a schematic structural diagram of a mounting member of the present invention;

FIG4 is a schematic structural diagram of the cable connection unit of FIG1 ;

FIG5 is a schematic structural diagram of the cable limiting buckle of FIG4 ;

FIG6 is a schematic structural diagram of the tension anchor pressure measuring unit of FIG1 ;

FIG7 is a schematic structural diagram of the anchoring adjustment unit of FIG1 ;

In the figure: 10, self-balancing frame; 101, left sub-frame; 102, right sub-frame; 103, expanded base; 20, damper; 21, exciter; 22, cable connection unit; 221, hollow circular tube; 222, threaded thin rod; 23, cable; 24, cable limit buckle; 241, clamping plate; 25, mounting part; 251, mounting plate; 252, positioning plate; 30, dynamic characteristic detector; 40, tension anchor pressure measuring unit; 401, pressure tester; 402, oil pump; 403, through-type pressure sensor; 404, hydraulic jack; 405, single-hole anchor; 406, isolation gasket; 50, anchor adjustment unit; 501, three-hole anchor; 502, fine-tuning nut; 503, mounting gasket; 504, threaded rod.

DETAILED DESCRIPTION

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

In response to the technical problems in the background technology, an embodiment of the utility model provides a dynamic characteristics testing device for a double-cable coupling system with a damper. As shown in Figure 1, in one embodiment, the dynamic characteristics testing device for a double-cable coupling system with a damper includes a self-balancing frame 10, two groups of cables 23, a cable connection unit 22, an exciter 21, two dampers 20 and a dynamic characteristics detector 30. The self-balancing frame 10 is provided with an upper crossbeam and a lower crossbeam, and two beam holes are respectively provided on the longitudinal beams on both sides; two groups of cables 23 are passed through the beam holes and fixed to the self-balancing frame 10, and are located between the upper crossbeam and the lower crossbeam of the self-balancing frame 10; the cable connection unit 22 is located between the two groups of cables 23, and is used to connect the two groups of cables 23 to form a double-cable coupling structure; the exciter 21 is arranged on the upper crossbeam or the lower crossbeam of the self-balancing frame 10, and the output end of the exciter 21 is connected to a group of cables 23; the two dampers 20 are respectively fixed to the upper crossbeam and the lower crossbeam of the self-balancing frame 10, and the connecting ends of the two dampers 20 are respectively connected to the two groups of cables 23; the dynamic characteristic detector 30 is provided with two detection ends, and the two detection ends are respectively connected to the two groups of cables 23.

Preferably, as shown in Figures 2 and 3, the bottom of the two dampers 20 and the exciter 21 are provided with mounting parts 25, and the mounting parts 25 can be slidably mounted on the upper beam or the lower beam of the self-balancing frame 10, so that the damper 20 and the exciter 21 can be fixed at any position of the upper beam or the lower beam of the self-balancing frame 10, thereby simulating the working condition of applying damping at different positions of the cable 23, or simulating the working condition of applying vibration at different positions of the cable 23.

Specifically, as shown in Figure 3, the mounting member 25 includes a mounting plate 251 and a positioning plate 252. The mounting plate 251 is fixedly connected to the positioning plate 252 by bolts. An accommodating space is formed between the mounting plate 251 and the positioning plate 252. The accommodating space is used to mount the upper beam or the lower beam of the self-balancing frame 10. The mounting plate 251 is used to install the damper 20 or the exciter 21.

In one embodiment, as shown in FIG4 , the inter-cable connection unit 22 includes a hollow circular tube 221 and a threaded thin rod 222. The inner side of the hollow circular tube 221 is provided with threads. One end of the hollow circular tube 221 is provided with a cable stop buckle 24 connected to the cable 23. The other end of the hollow circular tube 221 is fixedly connected to one end of the threaded thin rod 222 by threads. The other end of the threaded thin rod 222 is also provided with a cable stop buckle 24. The threaded thin rod 222 is screwed into the hollow circular tube 221 by threads, and the rotation depth can be freely adjusted, so that the inter-cable connection unit 22 can be more easily placed in the middle of the cable 23 when the cable 23 is tightened, thereby ensuring the reliability of the connection between the cables 23.

Specifically, as shown in FIG5 , the cable limit buckle 24 includes two clamping pieces 241 arranged opposite to each other. The size of the clamping pieces 241 can be selected according to the diameter of the cable 23. The two ends of the two clamping pieces 241 are connected correspondingly by bolts. An arc-shaped protrusion is formed in the middle of the clamping piece 241. A limit space is formed between the two clamping pieces 241, and the limit space is used to clamp and fix the cable 23. The two clamping pieces 241 are spaced apart by bolts to ensure a tight connection with the cable 23, thereby ensuring the accuracy of the vibration test results. In this embodiment, the output end of the exciter 21 and the connecting end of the damper 20 are also fixedly connected to the cable 23 through the cable limit buckle 24.

In one embodiment, as shown in FIG6 , a tension anchoring pressure measuring unit 40 is provided at the connection between the two groups of cables 23 and one side of the self-balancing frame 10. The tension anchoring pressure measuring unit 40 includes a pressure tester 401 and an oil pump 402, and a through-type pressure sensor 403, a hydraulic jack 404 and a single-hole anchor 405 which are sequentially sleeved on the cables 23. Isolation gaskets 406 are sleeved on both sides of the through-type pressure sensor 403 to separate the self-balancing frame 10 and the hydraulic jack 404. The pressure tester 401 is electrically connected to the through-type pressure sensor 403. The oil pump 402 is connected to the hydraulic jack 404 through an oil pipe to pressurize the hydraulic jack 404. The single-hole anchor 405 is used to anchor the cables 23. The tension anchoring pressure measuring unit 40 realizes dynamic measurement of tension force while anchoring the cables 23, and the operation is convenient and quick.

In one embodiment, as shown in FIG7 , the connection between the two groups of cables 23 and the other side longitudinal beam of the self-balancing frame 10 is provided with an anchoring adjustment unit 50, which includes a three-hole anchor 501, a fine-tuning nut 502, a mounting gasket 503 and two threaded rods 504. The mounting gasket 503 is sleeved on the cable 23, and the two threaded rods 504 are located on opposite sides of the cable 23. One end of the threaded rod 504 is fixedly connected to the mounting gasket 503. The three holes of the three-hole anchor 501 are sleeved on the cable 23 and the two threaded rods 504 respectively. The fine-tuning nut 502 is sleeved on the threaded rod 504 through a thread and abuts against the side of the three-hole anchor 501 close to the mounting gasket 503. The user can achieve precise adjustment of the tension of the cable 23 by rotating the fine-tuning nut 502, which makes up for the deficiency that the tension value of the hydraulic jack 404 is difficult to accurately control, and ensures the accuracy of the tension value.

In one embodiment, as shown in FIG2 , the self-balancing frame 10 includes a left subframe 101 and a right subframe 102, the upper beam and the lower beam of the left subframe 101 are respectively telescopically embedded in the upper beam and the lower beam of the right subframe 102, the upper beam and the lower beam of the left subframe 101 and the upper beam and the lower beam of the right subframe 102 are evenly spaced and correspondingly provided with threaded through holes, and the left subframe 101 and the right subframe 102 are fixed by bolt connection. The self-balancing frame 10 can adjust the frame length in multiple stages, thereby meeting the test of the dynamic characteristics of the cables 23 of different lengths.

Preferably, an enlarged base 103 is provided at the bottom of the self-balancing frame 10 to ensure the stability of the self-balancing frame 10 during the vibration of the cable 23, reduce the influence of ground vibration on the vibration of the cable 23, and improve the accuracy of the test results.

The working process and principle of a dual-cable coupling system dynamic characteristics testing device with a damper in the embodiment of the utility model are as follows:

The two groups of cables 23 pass through the upper and lower bundle holes of the self-balancing frame 10 respectively. A tensioning anchoring pressure measuring unit 40 is set on the right side, and an anchoring adjustment unit 50 is set on the left side. The fine-tuning nut 502 is screwed outward to the middle of the threaded area in the anchoring adjustment unit 50. After placing an isolation gasket 406 on the tensioning anchoring pressure measuring unit 40, the hydraulic jack 404 is used to tension the cable 23. After tensioning to a value close to the preset tension, the fine-tuning nut 502 is rotated to fine-tune the tension. At the same time, the reading of the pressure tester 401 is observed and adjusted to be basically consistent with the preset tension.

The damper 20, the exciter 21, and the inter-cable connection unit 22 are installed in sequence, and the damper 20, the exciter 21 and the cable 23 are fixed by the cable limit buckle 24, and the two cables 23 are coupled by the inter-cable connection unit 22. The detection end of the dynamic characteristic detector 30 is pasted or magnetically fixed just above the two cables 23, and the exciter 21 is started to excite one of the cables 23. The acceleration time history curve of the double-cable coupling system with the damper 20 is measured by the dynamic characteristic detector 30, and then the velocity and displacement time history curves are obtained. By adjusting the length of the self-balancing frame 10, the position of the inter-cable connection unit 22, and the position and size of the damper 20, the influence of different parameters on the dynamic characteristics of the double-cable coupling system with the damper 20 can be analyzed.

Compared with the prior art, the beneficial effects of the double-cable coupling system dynamic characteristics testing device with a damper in the embodiment of the utility model are as follows:

1. A dynamic characteristic test device for a double-cable coupling system with a damper in an embodiment of the utility model forms a double-cable coupling structure in a self-balancing frame, and arranges dampers and exciters on the upper and lower beams of the self-balancing frame. The dynamic characteristic detector detects the relevant parameters of the cable vibration to realize the dynamic characteristic test of the double-cable coupling system.

2. A dynamic characteristic test device for a double-cable coupling system with a damper in an embodiment of the utility model can set a cable connection device at any position within the anchoring interval of two groups of cables to meet the requirement of applying coupling constraints to any position of the two cables.

3. A dual-cable coupling system dynamic characteristics testing device with dampers in an embodiment of the utility model can simultaneously set dampers for two groups of cables. The dampers and exciters are stably fixed on the upper and lower beams of the retractable self-balancing frame, and the positions can be adjusted arbitrarily, thereby satisfying the requirements of applying damping and excitation to any positions of the two cables.

The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims (9)

1. A dynamic characteristics test device for a double-cable coupling system with a damper, comprising: A self-balancing frame, a dynamic characteristics detector, a cable connection unit, an exciter, two dampers and two sets of cables; The self-balancing frame is provided with an upper crossbeam and a lower crossbeam, and two beam holes are respectively provided on the longitudinal beams on both sides; The two groups of cables are fixed to the self-balancing frame through the beam holes and are located between the upper beam and the lower beam of the self-balancing frame; The inter-cable connecting unit is located between the two groups of cables and is used to connect the two groups of cables; The exciter is arranged on the upper beam or the lower beam of the self-balancing frame, and the output end of the exciter is connected to a group of the cables; The two dampers are respectively fixed to the upper beam and the lower beam of the self-balancing frame, and the connecting ends of the two dampers are respectively connected to the two groups of cables; The dynamic characteristic detector is provided with two detection ends, and the two detection ends are respectively connected to the two groups of cables. 2. A double-cable coupling system dynamic characteristics testing device with a damper according to claim 1, characterized in that: The bottoms of the two dampers and the exciter are both provided with mounting parts, and the mounting parts can be slidably sleeved on the upper beam or the lower beam of the self-balancing frame. 3. A double-cable coupling system dynamic characteristics testing device with a damper according to claim 2, characterized in that: The mounting member includes a mounting plate and a positioning plate, wherein the mounting plate is fixedly connected to the positioning plate by bolts, and an accommodating space is formed between the mounting plate and the positioning plate, wherein the accommodating space is used to fit the upper beam or the lower beam of the self-balancing frame, and the mounting plate is used to install the damper or the exciter. 4. The double-cable coupling system dynamic characteristics testing device with a damper according to claim 1, characterized in that: The cable connection unit includes a hollow circular tube and a threaded thin rod. The inner side of the hollow circular tube is provided with a thread. One end of the hollow circular tube is provided with a cable limit buckle connected to the cable. The other end of the hollow circular tube is fixedly connected to one end of the threaded thin rod by a thread, and the other end of the threaded thin rod is provided with the cable limit buckle. 5. A double-cable coupling system dynamic characteristics testing device with a damper according to claim 4, characterized in that: The cable limiting buckle includes two clamping plates arranged opposite to each other, the two ends of the two clamping plates are correspondingly connected by bolts, an arc-shaped protrusion is formed in the middle of the clamping plate, and a limiting space is formed between the two clamping plates, and the limiting space is used to clamp and fix the cable. 6. The double-cable coupling system dynamic characteristics testing device with damper according to claim 1, characterized in that: A tensioning anchoring pressure measuring unit is provided at the connection between the two groups of cables and the longitudinal beam on one side of the self-balancing frame. The tensioning anchoring pressure measuring unit includes a pressure tester and an oil pump, and a through-type pressure sensor, a hydraulic jack and a single-hole anchor which are sequentially sleeved on the cables. Isolation gaskets are sleeved on both sides of the through-type pressure sensor to separate the self-balancing frame and the hydraulic jack. The pressure tester is electrically connected to the through-type pressure sensor, and the oil pump is connected to the hydraulic jack through an oil pipe. 7. A double-cable coupling system dynamic characteristics testing device with a damper according to claim 6, characterized in that: Anchoring adjustment units are provided at the connection between the two groups of cables and the longitudinal beam on the other side of the self-balancing frame. The anchoring adjustment units include a three-hole anchor, a fine-tuning nut, a mounting gasket and two threaded rods. The mounting gasket is sleeved on the cables, and the two threaded rods are located on opposite sides of the cables. One end of the threaded rod is fixedly connected to the mounting gasket. The three holes of the three-hole anchor are respectively sleeved on the cables and the two threaded rods. The fine-tuning nut is sleeved on the threaded rod through threads and abuts against the side of the three-hole anchor close to the mounting gasket. 8. The double-cable coupling system dynamic characteristics testing device with damper according to claim 1, characterized in that: The self-balancing frame includes a left sub-frame and a right sub-frame, the upper beam and the lower beam of the left sub-frame are respectively telescopically embedded in the upper beam and the lower beam of the right sub-frame, the upper beam and the lower beam of the left sub-frame and the upper beam and the lower beam of the right sub-frame are evenly spaced and correspondingly provided with threaded through holes, and the left sub-frame and the right sub-frame are fixed by bolt connection. 9. The double-cable coupling system dynamic characteristics testing device with damper according to claim 1, characterized in that: An enlarged base is arranged at the bottom of the self-balancing frame.