Fabricated TMD device for vibration reduction of track box girder
By designing a prefabricated TMD device with detachable connections and adjustable parameters, the problems of complex structure and difficult to adjust parameters of the existing TMD device are solved, effective vibration reduction and noise reduction of track box girders are achieved, and maintenance and parameter matching are facilitated.
Patent Information
- Application Number
- CN202421126821.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-05-22
Smart Images
Figure CN222758698U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bridge engineering, in particular to an assembled TMD device for vibration reduction of a track box girder. Background Art
[0002] In recent years, rail transit has developed rapidly with its high carrying capacity, speed and safety. Viaducts are favored for their advantages such as reducing post-construction settlement, saving land and short construction period. They are widely used in urban rail transit, among which concrete box girder bridges are the most common.
[0003] However, with the rapid development of urban rail transit, the continuous increase in train speed has led to more significant interactions in the vehicle-bridge coupling system. The system dynamic response caused by track excitation shows obvious randomness, and the structural vibration and noise problems of concrete box girder bridges in service are becoming increasingly prominent. When trains pass through bridges, structural vibrations are induced, and the vibrations of concrete box girder bridges radiate low-frequency noise to the surroundings, causing long-term harm to human physical and mental health.
[0004] Vibration control methods can generally be divided into two categories: passive and active control. Passive control refers to changing the vibration characteristics by adding control systems to certain parts of the structure or changing the form of structural components without external energy intervention. Tuned Mass Damper (TMD) is a common passive control device with the advantages of energy saving, simple structure, low cost and easy maintenance, so it has attracted much attention in application development.
[0005] However, in current TMD research, dampers are usually required to connect the tuned mass block to the main structure, and the connection nodes are usually rigidly connected. This rigid connection makes the connection node structure complex and inconvenient to disassemble, and the TMD parameters are difficult to flexibly adjust. In practical applications, the accumulation of damage may cause a certain degree of detuning, thus affecting the vibration reduction effect. Utility Model Content
[0006] The main purpose of the utility model is to provide an assembled TMD device for track box girder vibration reduction with replaceable device accessories.
[0007] The utility model provides an assembled TMD device for track box girder vibration reduction, comprising a tuning mass component, a reset component and a damping adjustment component; the mass of the tuning mass component is adjustable, the reset component is detachably connected to the tuning mass component, the damping adjustment component is fixed to the track box girder, the reset component is limitably connected to the damping adjustment component, and the damping size of the damping adjustment component is adjustable.
[0008] In one embodiment of the above-mentioned device, the tuning mass assembly includes a tuning frame and a counterweight plate; the tuning frame is two upper and lower opposite steel frame plates, which clamp multiple configuration plates, and the counterweight plate is a steel plate; high-strength bolts pass through the center of the tuning frame and the counterweight plate to limit and fix the two together.
[0009] In one implementation of the above device, four pairs of clamping ears are provided at four corners of the bottom end of the lower steel frame plate of the tuning frame, and four groups of reset components are respectively connected to the clamping ears for limiting positions.
[0010] In one embodiment of the above device, the reset assembly includes a connecting seat, a reset rod and a spring; the connecting seat is inserted into the clamping ear seat and is fixed by a high-strength connecting piece; a vertical reset rod is fixed to the bottom end of the connecting seat, and a spring is disposed on the outer sleeve of the reset rod.
[0011] In one implementation manner of the above device, a damping adjustment assembly is arranged at the bottom end of the reset assembly, and the damping adjustment assembly includes a U-shaped sheet, a friction rubber and a pressure-adjusting bolt.
[0012] In one embodiment of the above device, the U-shaped piece is fixed on the track box beam; a transverse oblong hole is opened at the bottom of the U-shaped piece; the bottom end of the reset rod is wrapped by two pieces of friction rubber, the friction rubber is semicircular, and is placed in the U-shaped piece, and a pressure-adjusting bolt is arranged on each side of the U-shaped piece, and the pressure-adjusting bolt pushes the friction rubber onto the reset rod.
[0013] In another embodiment of the above-mentioned device, the tuning frame of the tuning mass assembly is two steel frame plates opposite to each other on the left and right, the right steel frame plate is L-shaped, and a plurality of vertically placed configuration plates are placed on the bottom edge of the right steel frame plate and are clamped and limited; a roller is arranged below the bottom edge of the right steel frame plate.
[0014] In another implementation of the above device, the side of the steel frame plate is connected to the reset assembly, and the reset assembly is arranged horizontally.
[0015] In another embodiment of the above device, vertical baffles are respectively provided on both sides of the tuning mass assembly; a horizontal damping adjustment assembly is provided on the vertical edge of each baffle, and the reset assembly is connected to the damping adjustment assembly.
[0016] The beneficial effects of the utility model are:
[0017] 1. The coordination of the components of this device can effectively reduce the overall vibration amplitude of the track box beam structure, dissipate the vibration energy of the structure through the damping element, and reduce the low-frequency noise generated by the vibration of the track box beam;
[0018] 2. The detachable connection between the tuning mass component and the reset component can realize the separation between the two, which is convenient for timely replacement of damaged structural parts, convenient for maintenance, and prolonging the service life of the device;
[0019] 3. This device can flexibly change the mass of the tuned mass component, the spring stiffness of the reset component and the damping size of the damping adjustment component to match the natural vibration frequency of the device with the main vibration frequency of the track box girder to achieve the best vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.
[0021] Figure 2 for Figure 1 Schematic diagram of the side view structure of the tuning mass component and the reset component.
[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the middle damping adjustment component.
[0023] Figure 4 for Figure 1 Layout of the device in use shown.
[0024] Figure 5 It is a structural schematic diagram of another embodiment of the present invention.
[0025] Figure 6 for Figure 5 Layout of the device in use shown. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the relevant technical solutions. Obviously, the described embodiments are only part of the embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] Embodiment 1: Figure 1 As shown, the assembled TMD device for rail box girder vibration reduction disclosed in this embodiment includes a tuned mass component 1, a reset component 2 and a damping adjustment component 3.
[0028] The tuning mass assembly 1 includes a tuning frame 11 and a weight plate 12 .
[0029] The tuning frame 11 is two upper and lower opposite steel frame plates, which clamp a plurality of configuration plates 12, and the counterweight plate is a steel plate. High-strength bolts pass through the center of the tuning frame and the counterweight plate to limit and fix the two together.
[0030] The weight of the tuning mass assembly can be changed by increasing or decreasing the number of weight plates 12, thereby adjusting the natural frequency of the TMD device.
[0031] Four pairs of clamping ears are arranged at the four corners of the bottom end of the lower steel frame plate of the tuning frame 11, and four groups of reset components 2 are respectively connected to the clamping ears for limiting position.
[0032] The reset assembly 2 includes a connecting seat 21 , a reset rod 22 and a spring 23 .
[0033] like Figure 2 As shown, the connecting seat 21 is inserted into the clamping ear seat and is fixed by high-strength bolts.
[0034] A vertical reset rod 22 is fixed to the bottom end of the connecting seat 21 , and a spring 23 is disposed on the outer sleeve of the reset rod.
[0035] The connection seat and the clamping ear seat are provided for the detachable connection between the reset assembly and the tuning mass assembly. During assembly and disassembly, the reset assembly and the tuning mass assembly can be separated by simply twisting the high-strength bolts, and the damaged structural parts can be replaced at will.
[0036] The spring is set to provide a restoring force for the reset component, so that the reset component has a self-reset function. When the device is vibrated by external excitation, the tuned mass component will also vibrate. Due to the presence of the spring, the vibration of the tuned mass component is opposite to the external vibration phase, resulting in a vibration cancellation effect.
[0037] like Figure 3 As shown, a damping adjustment component 3 is disposed at the bottom end of each group of reset components 2 , and the damping adjustment component includes a U-shaped sheet 31 , a friction rubber 32 and a pressure regulating bolt 33 .
[0038] The U-shaped piece 31 is a U-shaped steel piece fixed on the rail box beam; a transverse oblong hole is opened at the bottom of the U-shaped piece to facilitate the reciprocating movement of the reset pull rod.
[0039] The bottom end of the reset rod 22 is wrapped by two semicircular friction rubbers 32, which are placed in a U-shaped sheet 31. A pressure-adjusting bolt 33 is provided on each side of the U-shaped sheet, and the pressure-adjusting bolt pushes the friction rubber onto the reset rod. By tightening the pressure-adjusting bolt, the positive friction between the friction rubber and the reset rod can be adjusted to provide the required damping for the device, converting the vibration energy into heat energy, and achieving effective control and dissipation of the vibration.
[0040] The effect of this device in controlling the vibration of the track box girder is related to the mass ratio of the tuned mass component. The larger the mass ratio, the better the vibration reduction effect. After determining the system mass of the device, the installation position further affects the vibration reduction effect. According to the calculation formula of equivalent mass, when the mass point is located at the antinode position of a certain mode of the box girder, that is, the point with the largest modal deformation, the equivalent mass of the mode is the smallest, and the mass ratio is the largest. When the mass point is located at the node position of a certain mode of the box girder, that is, the point where the modal deformation is zero, the equivalent mass of the mode is infinite, and the mass ratio is zero. Therefore, the installation position of the device should be the antinode position of the controlled mode, and it should also be a point where the vibration deformation of other modes is smaller, so as to reduce the interference of other modes.
[0041] like Figure 4 As shown, when the device is arranged on the track box girder, the device is arranged at the antinode position of the controlled mode. If the antinode of the controlled mode is at the edge of the section of the track box girder, the device is installed at the edge of the section of the track box girder; if the antinode of the controlled mode is at the center of the section of the track box girder, the device is installed at the center of the section of the track box girder.
[0042] When using this device, the natural frequency of the device is matched with the main vibration frequency of the track box girder by adjusting the mass of the tuned mass component, the spring stiffness of the reset component and the damping size of the damping adjustment component. When the track box girder is subjected to external excitation, the device offsets the vibration of the track box girder itself through vibration in the opposite phase, thereby reducing the overall vibration amplitude of the track box girder. At the same time, the vibration energy of the track box girder is effectively dissipated through the damping element.
[0043] The advantages of using this device are:
[0044] 1. The coordination of the components of the device can effectively reduce the overall vibration amplitude of the track box girder structure, dissipate the vibration energy of the structure through the damping element, and reduce the low-frequency noise generated when the track box girder vibrates.
[0045] 2. The detachable connection between the tuning mass assembly and the reset assembly can realize the separation between the two, which is convenient for timely replacement of damaged structural parts, convenient for maintenance, and prolonging the service life of the device.
[0046] 3. This device can flexibly change the mass of the tuned mass component, the spring stiffness of the reset component and the damping size of the damping adjustment component to match the natural vibration frequency of the device with the main vibration frequency of the track box girder to achieve the best vibration reduction effect.
[0047] Embodiment 2: Figure 5 As shown, the assembled TMD device for rail box girder vibration reduction disclosed in this embodiment includes a tuned mass component 1, a reset component 2 and a damping adjustment component 3.
[0048] The difference between this embodiment and the first embodiment is that:
[0049] The tuning frame of the tuning mass assembly 1 is two steel frame plates facing each other. The right steel frame plate is L-shaped. A plurality of vertically placed configuration plates are placed on the bottom edge of the right steel frame plate and are clamped and limited.
[0050] Two pairs of rollers 4 are arranged below the bottom edge of the right steel frame plate.
[0051] Two pairs of reset components 2 are respectively connected to the two sides of the two steel frame plates, and the reset components are arranged horizontally.
[0052] Two vertical baffles 5 are arranged on both sides of the tuning mass assembly 1. Two groups of horizontal damping adjustment assemblies 3 are arranged on the vertical sides of each baffle, and the reset rod of the reset assembly 2 is connected to the damping adjustment assembly.
[0053] like Figure 6 As shown, when the device of this embodiment is installed at the center position of the bottom end of the track box beam, the lateral and longitudinal vibrations of the track box beam can be controlled.
[0054] The advantage of using the device of this embodiment over the first embodiment is that improvements have been made to the control of the lateral vibration of the track box girder. After the components are turned over, the baffles and rollers are used to ensure that the device can move horizontally under the action of external vibrations, thereby achieving a better shock-absorbing effect on lateral vibrations.
[0055] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although detailed descriptions are made with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. An assembled TMD device for vibration reduction of a rail box girder, characterized in that: It includes a tuning mass component, a reset component and a damping adjustment component; The mass of the tuning mass component is adjustable, the reset component is detachably connected to the tuning mass component, the damping adjustment component is fixed on the track box beam, the reset component is connected to the damping adjustment component to limit the position, and the damping size of the damping adjustment component is adjustable; The tuning mass assembly includes a tuning frame and a counterweight plate; the tuning frame is two upper and lower opposite steel frame plates, which clamp multiple configuration plates, and the counterweight plate is a steel plate; high-strength bolts pass through the center of the tuning frame and the counterweight plate to limit and fix the two together; The reset assembly includes a connecting seat, a reset rod and a spring; the connecting seat is detachably connected to the bottom end of the tuning frame; a vertical reset rod is fixed to the bottom end of the connecting seat, and a spring is arranged on the outer sleeve of the reset rod; A damping adjustment component is arranged at the bottom end of the reset component, and the damping adjustment component comprises a U-shaped sheet, a friction rubber and a pressure-adjusting bolt.
2. The assembled TMD device for rail box girder vibration reduction according to claim 1, characterized in that: Four pairs of clamping ear seats are arranged at the four corners of the bottom end of the lower steel frame plate of the tuning frame, and four groups of reset components are respectively connected to the clamping ear seats for limiting.
3. The assembled TMD device for rail box girder vibration reduction according to claim 1, characterized in that: The U-shaped piece is fixed on the track box beam; a transverse oblong hole is opened at the bottom of the U-shaped piece; the bottom end of the reset rod is wrapped by two pieces of friction rubber, the friction rubber is semicircular and is placed in the U-shaped piece, and a pressure regulating bolt is arranged on each side of the U-shaped piece, and the pressure regulating bolt pushes the friction rubber onto the reset rod.
4. The assembled TMD device for vibration reduction of a rail box beam according to claim 1, characterized in that: The tuning frame of the tuning mass assembly is two steel frame plates facing each other on the left and right. The right steel frame plate is L-shaped. A plurality of vertically placed configuration plates are placed on the bottom edge of the right steel frame plate and are clamped and limited. A roller is arranged below the bottom edge of the right steel frame plate.
5. The assembled TMD device for rail box girder vibration reduction according to claim 4, characterized in that: The side of the steel frame plate is connected to the reset assembly, and the reset assembly is arranged horizontally.
6. The assembled TMD device for vibration reduction of a rail box girder according to claim 5, characterized in that: Vertical baffles are respectively arranged on both sides of the tuning mass component; a horizontal damping adjustment component is arranged on the vertical side of each baffle, and the reset component is connected to the damping adjustment component.