Damping stepless adjustment eddy current tuned mass damper and installation adjustment method

Abstract

The application discloses a kind of electric eddy current tuned mass dampers of damping stepless regulation, including outer frame unit, mass block unit, spring unit, damping stepless regulation unit, the damping stepless regulation unit includes magnet steel assembly, adjusting assembly, and conductor assembly on adjusting assembly, the mass block unit is connected with outer frame unit by spring unit, the magnet steel assembly is located on outer frame unit, the adjusting assembly is located on mass block unit, the damping size between the conductor assembly and magnet steel assembly is adjusted by the adjusting assembly.The application can meet different damping ratio requirements, can achieve a stepless regulation of damping ratio, ensure the accuracy of tuned mass damper resistance ratio regulation, improve energy consumption efficiency, improve bridge comfort evaluation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge vibration reduction, in particular to a damper stepless adjustment eddy current tuned mass damper and installation adjustment method. BACKGROUND

[0002] With the development of society, people's demand for pedestrian landscape bridges is increasing, and the comfort requirement for pedestrian landscape bridges is becoming more stringent. People have begun to discuss the vibration mechanism of bridges and building structures and the measures for vibration control.

[0003] With the continuous development of technology, the number of large-span bridges and special-shaped pedestrian landscape bridges in the civil industry is increasing, and the aesthetic level of landscape bridges is improving. With the increase of bridge span, the light weight and thinness of materials make the structure lighter in mass and lower in stiffness. When subjected to dynamic load (continuous excitation at a certain frequency), the natural frequency of the bridge resonates with the excitation frequency, the dynamic response of the structure increases, the structure vibrates frequently, and the vibration amplitude increases. For this type of vibration, tuned mass dampers are used for control, and the damping effect is good.

[0004] A tuned mass damper is a mechanical device composed of a mass unit, a spring unit, a support frame unit, and a damping unit. It absorbs the vibration energy of the main structure into the mass, converts it into other energy forms, and dissipates it. Traditional dampers are generally mechanical and hydraulic. The mechanical friction damper has large starting friction, and the hydraulic damper has the problem of oil leakage. The eddy current damper can meet the requirements of high sensitivity and long maintenance life.

[0005] Most existing tuned mass dampers cannot be adjusted in damping and frequency on site after being installed on the bridge, and the damping size adjustment is not accurate, which may not achieve the best damping efficiency.

[0006] Existing tuned mass dampers are divided into traditional mechanical and hydraulic dampers, and eddy current dampers with high starting sensitivity. Due to the complexity of bridge engineering construction, various factors may cause deviations between the actual and theoretical values of the bridge (bridge modal frequency, bridge structural damping ratio). Using theoretical parameters to design the tuned mass damper may not achieve the best damping effect. If the design of the tuned mass damper is carried out after the bridge construction is completed and the on-site test is conducted, the bridge construction period will be prolonged, affecting the delivery cycle. Therefore, it is necessary to design and invent a damper stepless adjustment eddy current tuned mass damper. SUMMARY

[0007] In view of the problems in the prior art, the application provides a damping stepless adjustment eddy current tuned mass damper, which is applied to a pedestrian landscape bridge, reasonably matches a determined construction period, simplifies an installation process of the tuned mass damper, and can achieve the best damping effect by adjusting the damping of the tuned mass damper in a box girder according to measured data after the bridge is formed.

[0008] The technical scheme for achieving the object of the application is as follows: a damping stepless adjustment eddy current tuned mass damper, comprising an outer frame unit, a mass block unit, a spring unit, and a damping stepless adjustment unit, wherein the damping stepless adjustment unit comprises a magnetic steel assembly, an adjustment assembly, and a conductor assembly arranged on the adjustment assembly, the mass block unit is connected with the outer frame unit through the spring unit, the magnetic steel assembly is arranged on the outer frame unit, the adjustment assembly is arranged on the mass block unit, and the damping between the conductor assembly and the magnetic steel assembly is adjusted through the adjustment assembly.

[0009] Preferably, the adjustment assembly comprises a chuck body arranged on the mass block unit, a large bevel gear arranged in the chuck body, at least one umbrella gear meshing with the large bevel gear, and a plurality of movable clamping jaws which can move radially along the chuck body, the movable clamping jaws are provided with the conductor assembly on the side close to the magnetic steel assembly, and the movable clamping jaws move radially along the chuck body through the sliding groove on the large bevel gear under the drive of the umbrella gear, so as to drive the conductor assembly to move away from / close to the magnetic steel assembly.

[0010] Preferably, the mass block assembly is provided with an axial hollow channel, the magnetic steel assembly is arranged in the axial hollow channel, and the conductor assembly can move radially in the axial hollow channel to move away from / close to the magnetic steel assembly.

[0011] Preferably, the outer frame unit comprises an upper top plate assembly and a lower bottom plate assembly connected with the upper top plate assembly through a support assembly, the spring unit is connected with the lower bottom plate assembly, and the magnetic steel assembly is arranged on the lower bottom plate assembly.

[0012] Preferably, a guide assembly is arranged between the upper top plate assembly and the lower bottom plate assembly, the mass block unit is connected with the lower bottom plate assembly through the spring unit, and the mass block unit moves vertically along the guide assembly under the action of the spring unit.

[0013] Preferably, the magnetic steel assembly comprises a magnetic steel fixing frame arranged on the lower bottom plate assembly, a magnetic steel frame arranged on the magnetic steel fixing frame, and a plurality of magnetic steels arranged on the magnetic steel frame, and the plurality of magnetic steels are arranged along the circumference of the magnetic steel frame.

[0014] Preferably, the conductor assembly comprises a conductor plate back plate arranged on the movable clamping jaw and a conductor plate arranged on the conductor plate back plate, the conductor plate back plate is arranged in the shape of the conductor plate, and the conductor plate is arranged in the shape of a circular arc.

[0015] As preferred, the conductor plate is provided with three, and the movable clamping jaws are provided with three.

[0016] The application also provides a mounting and adjusting method of the damper stepless adjustment eddy current tuned mass damper, comprising the following steps:

[0017] (1) assembling the tuned mass damper into a whole;

[0018] (2) welding the tuned mass damper to the box girder through the connecting piece, and fixing the tuned mass damper through the lower bottom plate assembly and the connecting piece by bolting;

[0019] (3) rotating any one of the umbrella gears on the circumference by using the chuck wrench, driving the flat thread on the back surface of the big bevel gear to rotate, and then driving the several movable clamping jaws to move together, so that the gap between the magnetic steel and the conductor plate can be adjusted, and the size of the damping can be steplessly adjusted.

[0020] As preferred, the contact surface between the connecting piece and the tuned mass damper is horizontal when the connecting piece is welded.

[0021] By using the above technical scheme, the application has the following beneficial effects: (1) the damper adjusting device is used to meet different damping ratio requirements, and since there are gear parts in the damper adjusting device, the damping ratio can be steplessly adjusted, the accuracy of the damping ratio adjustment of the tuned mass damper is ensured, the energy consumption efficiency is improved, and the bridge comfort evaluation is improved.

[0022] (2) In the application, the damper unit adopts the eddy current damping technology, a set of damper stepless adjustment device is installed in the tuned mass damper (the relative movement of the conductor plate and the magnetic steel controls the size of the vertical damping ratio), when the conductor plate in the local magnetic field cuts the magnetic force line, the eddy current will be generated in the conductor plate, the eddy current will interact with the original magnetic field, a force that hinders the relative movement of the conductor plate and the magnetic field will be generated, the kinetic energy will be converted into heat energy and dissipated, the bridge structure damping ratio is increased, the bridge vibration amplitude decay rate is accelerated, and the vibration damping effect is achieved. The eddy current tuned mass damper does not rely on mechanical friction energy consumption, does not have working fluid, and thus does not have the problems of liquid leakage and sealing, has the advantages of high reliability, good durability, and compact and reasonable structure, and is thus particularly suitable for working environments that require long fatigue life and are not easy to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to make the content of the application more easily understood, the application will be further described in detail below according to specific embodiments and in combination with the drawings, in which

[0024] Figure 1 It is a three-dimensional view of the damper stepless adjustment eddy current tuned mass damper of the application;

[0025] Figure 2 This is a front view of the continuously adjustable eddy current tuned mass damper of the present invention.

[0026] Figure 3 for Figure 2 Sectional view of AA;

[0027] Figure 4 This is a top view of the continuously adjustable eddy current tuned mass damper of the present invention.

[0028] Figure 5 for Figure 4 Sectional view of BB;

[0029] Figure 6 This is a three-dimensional diagram of the damping stepless adjustment unit in this invention;

[0030] Figure 7 for Figure 6 The front view;

[0031] Figure 8 for Figure 7 Sectional view of DD;

[0032] Figure 9 for Figure 7 Sectional view of CC;

[0033] Figure 10 for Figure 7 Sectional view of EE;

[0034] Figure 11 A schematic diagram showing the scale for adjusting the damping magnitude of a continuously variable damping device;

[0035] Figure 12 A schematic diagram illustrating the adjustment of damping magnitude using a continuously variable damping device;

[0036] Figure 13 A schematic diagram of the installation of a box girder with a continuously adjustable eddy current tuned mass damper. Detailed Implementation Example 1

[0037] See Figures 1 to 13 This embodiment describes a continuously adjustable eddy current tuned mass damper, characterized in that it includes an outer frame unit 4, a mass block unit 1, a spring unit 2, and a continuously adjustable damping unit 3. The continuously adjustable damping unit includes a magnet assembly 31, an adjustment assembly 32, and a conductor assembly 33 disposed on the adjustment assembly. The mass block unit is connected to the outer frame unit through the spring unit. The magnet assembly is disposed on the outer frame unit, and the adjustment assembly is disposed on the mass block unit. The damping magnitude between the conductor assembly and the magnet assembly is adjusted by the adjustment assembly.

[0038] The adjustment assembly 32 includes a chuck body 321 mounted on the mass block unit, a large bevel gear 322 mounted inside the chuck body, at least one bevel gear 323 meshing with the large bevel gear, and several movable jaws 324 capable of radial movement along the chuck body. A conductor assembly is located on the side of each movable jaw near the magnet assembly. Driven by the bevel gear, the movable jaws move radially along the chuck body via a groove on the large bevel gear, thereby moving the conductor assembly away from / near the magnet assembly. Based on the working principle of the three-jaw chuck, by rotating any one of the three bevel gears on the circumference using the chuck wrench 6, the planar thread on the back of the large bevel gear rotates, causing the three movable jaws to move simultaneously. The conductor assembly is then mounted on the movable jaws, thus adjusting the gap between the magnet and the conductor plate, achieving stepless adjustment of the damping magnitude. Because the three movable jaws move simultaneously, the gap between the conductor assembly and the magnet on the three movable jaws is ensured to be consistent. The chuck wrench can be replaced by other drive mechanisms. Meanwhile, the side of the movable claw is engraved with gap adjustment scale 7, and the chuck body is also marked with gap adjustment mark 8, which allows for a direct observation of the gap size between the conductor plate and the magnet; this facilitates convenient and quick adjustment of the damping magnitude of the tuned mass damper on-site based on factory measurement data, achieving the optimal damping magnitude and the best bridge vibration reduction effect.

[0039] The mass block assembly has an axial hollow channel 5, the magnet assembly is located in the axial hollow channel, and the conductor assembly can move radially within the axial hollow channel to move away from / close to the magnet assembly.

[0040] The outer frame unit 4 includes an upper top plate assembly 41 and a lower bottom plate assembly 43 connected to the upper top plate assembly via a support assembly 42. The spring unit is connected to the lower bottom plate assembly, and the magnet assembly is disposed on the lower bottom plate assembly.

[0041] A guide assembly 44 is provided between the upper top plate assembly and the lower bottom plate assembly. The mass block unit is connected to the lower bottom plate assembly through a spring unit, and the mass block unit moves vertically along the guide assembly under the action of the spring unit. The spring is limited on the lower bottom plate assembly by a spring centering seat, and the spring supports the mass block assembly, forming the most important spring-mass structure of the tuned mass damper.

[0042] The outer frame unit provides overall support and connects to the bridge structure during installation. The mass block and spring units satisfy the mass ratio and vibration frequency parameters of the tuned mass damper. The guide assembly controls the vertical vibration of the mass block, effectively eliminating swaying or overturning phenomena that may occur in non-dominant directions. The stepless damping adjustment device is the main energy dissipation component of the tuned mass damper (TMD) system. Through gears and other components, it achieves stepless damping adjustment, precisely controlling the damping ratio of the tuned mass damper for better bridge vibration reduction. Furthermore, the spring units and guide assembly are arranged independently, allowing for the free replacement of springs and mass blocks after the tuned mass damper is installed on the bridge structure, enabling adjustment of the frequency and mass ratio parameters of the eddy current tuned mass damper.

[0043] The mass block assembly consists of a main mass block for mounting the sliding component and an additional mass block for adjustment; the guide assembly consists of a guide rod and a sliding component; the spring unit consists of a spring and a spring limiting centering seat; the damping part is an eddy current magnetic damping system with no working fluid, so there will be no leakage, and it mainly consists of a stepless damping adjustment device; the top plate assembly mainly consists of a guide rod positioning frame and mass block limiting anti-collision rubber.

[0044] The spring is limited to the lower base plate assembly by a spring centering seat, and the spring supports the mass block assembly, forming the most important spring-mass structure of the tuned mass damper (which determines the frequency of the damper); the guide rod passes through the sliding component fixed on the main mass block, and the lower end of the guide rod is fixed to the base plate assembly, controlling the movement direction of the mass block to be vertical. Because the sliding component is a precision sliding pair part and the surface of the guide rod is smooth, the starting friction is small and the sensitivity is high; the upper end of the guide rod is fixed to the upper top plate assembly, so that the guide rod is fixed and positioned; the support assembly is connected. The upper top plate assembly and the lower bottom plate assembly together form a complete outer frame structure. The stepless damping adjustment device consists of two main components (conductor assembly and magnet assembly), which are respectively fixed to the mass block assembly and the lower bottom plate assembly. The conductor assembly, composed of a chuck body, bevel gear, large bevel gear, conductor plate back plate, and conductor plate, is bolted to the mass block assembly and moves vertically together with it. The magnet, magnet frame, and magnet frame fixing seat are fixed to the lower bottom plate assembly and are fixed to the box girder connector along with the lower bottom plate assembly. When the bridge vibrates, the mass block assembly vibrates, and the conductor assembly and magnet assembly move relative to each other. When the conductor plate in the local magnetic field cuts the magnetic lines of force, eddy currents are generated in the conductor plate. These eddy currents interact with the original magnetic field, generating a force that opposes the relative motion between the conductor plate and the magnetic field. This converts kinetic energy into heat energy, dissipates it, increases the damping ratio of the bridge structure, accelerates the attenuation rate of the bridge vibration amplitude, and achieves the effect of vibration reduction.

[0045] The magnet assembly 31 includes a magnet fixing frame 311 disposed on the lower base plate assembly, a magnet frame 312 disposed on the magnet fixing frame, and a plurality of magnets 313 disposed on the magnet frame, wherein the plurality of magnets are arranged along the circumference of the magnet frame.

[0046] The conductor assembly 33 includes a conductor plate back plate 331 disposed on the movable claw and a conductor plate 332 disposed on the conductor plate back plate. The conductor plate back plate is formed according to the conductor plate, and the conductor plate is arranged in an arc shape.

[0047] The conductor plate is set to three, and the movable claw is set to three. The number of three makes damping adjustment easier and the force more even.

[0048] The present invention also provides a method for installing and adjusting a continuously adjustable eddy current tuned mass damper, comprising the following steps:

[0049] (1) Assemble the tuned mass damper into a whole;

[0050] (2) The tuned mass damper is welded to the box girder through the connector 9. The tuned mass damper is fixed by bolts to the bottom plate assembly and the connector. When the connector is welded, the contact surface between the connector and the tuned mass damper is horizontal.

[0051] (3) Use chuck wrench 6 to rotate any one of the bevel gears on the circumference, which will drive the flat thread on the back of the large bevel gear to rotate, thereby driving several movable jaws to move together, so as to adjust the gap between the magnet and the conductor plate, thereby achieving stepless adjustment of the damping magnitude.

[0052] During on-site installation on bridges, a type of steplessly adjustable eddy current tuned mass damper is simple and quick to install. It only requires pre-installing a connector inside the bridge box girder, hoisting the tuned mass damper onto the connector, and then bolting it through the mounting holes on the base plate assembly of the main body to the mounting holes on the connector.

[0053] The connectors are welded inside the box girder, and the tuned mass damper is fixed by bolts connecting the base plate assembly and the connectors. The form of the connectors can be adjusted accordingly based on the form of the box girder. During the welding of the connectors, it is necessary to ensure that the contact surfaces of the connectors and the tuned mass damper are horizontal, thereby ensuring that the main structure of the tuned mass damper remains horizontal and achieves the best damping and vibration reduction effect of the tuned mass damper.

[0054] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuously adjustable eddy current tuned mass damper, characterized in that: The device includes an outer frame unit (4), a mass block unit (1), a spring unit (2), and a damping stepless adjustment unit (3). The damping stepless adjustment unit includes a magnet assembly (31), an adjustment assembly (32), and a conductor assembly (33) disposed on the adjustment assembly. The mass block unit is connected to the outer frame unit through the spring unit. The magnet assembly is disposed on the outer frame unit. The adjustment assembly is disposed on the mass block unit. The damping magnitude between the conductor assembly and the magnet assembly is adjusted by the adjustment assembly. The adjustment assembly (32) includes a chuck body (321) disposed on the mass block unit, a large bevel gear (322) disposed in the chuck body, at least one bevel gear (323) meshing with the large bevel gear, and several movable jaws (324) that can move radially along the chuck body. The movable jaws are provided with conductor components on the side near the magnet assembly. Driven by the bevel gear, the movable jaws move radially along the chuck body through the groove on the large bevel gear, thereby driving the conductor components away from / closer to the magnet assembly. The adjustment assembly has an axial hollow channel (5), the magnet assembly is located in the axial hollow channel, and the conductor assembly can move radially in the axial hollow channel to move away from / close to the magnet assembly.

2. The continuously adjustable eddy current tuned mass damper according to claim 1, characterized in that: The outer frame unit (4) includes an upper top plate assembly (41) and a lower bottom plate assembly (43) connected to the upper top plate assembly via a support assembly (42). The spring unit is connected to the lower bottom plate assembly, and the magnet assembly is disposed on the lower bottom plate assembly.

3. The continuously adjustable eddy current tuned mass damper according to claim 2, characterized in that: A guide assembly (44) is provided between the upper top plate assembly and the lower bottom plate assembly. The mass block unit is connected to the lower bottom plate assembly through a spring unit. The mass block unit moves vertically along the guide assembly under the action of the spring unit.

4. The continuously adjustable eddy current tuned mass damper according to claim 2, characterized in that: The magnet assembly (31) includes a magnet fixing frame (311) on the lower base plate assembly, a magnet frame (312) on the magnet fixing frame, and a plurality of magnets (313) on the magnet frame, wherein the plurality of magnets are arranged along the circumference of the magnet frame.

5. The continuously adjustable eddy current tuned mass damper according to claim 1, characterized in that: The conductor assembly (33) includes a conductor plate back plate (331) disposed on the movable claw and a conductor plate (332) disposed on the conductor plate back plate. The conductor plate back plate is formed according to the conductor plate and the conductor plate is arranged in an arc shape.

6. The continuously adjustable eddy current tuned mass damper according to claim 5, characterized in that: The conductor plate is set to three, and the movable claw is set to three.

7. A method for installing and adjusting a continuously adjustable eddy current tuned mass damper as described in any one of claims 1-6, characterized in that: Includes the following steps: (1) Assemble the tuned mass damper into a whole; (2) The tuned mass damper is welded to the box girder through the connector (9), and the tuned mass damper is fixed by bolting the bottom plate assembly and the connector. (3) Use a chuck wrench (6) to rotate any one of the bevel gears on the circumference, which will drive the plane thread on the back of the large bevel gear to rotate, thereby driving several movable jaws to move together, so as to adjust the gap between the magnet and the conductor plate, thereby achieving stepless adjustment of the damping size.

8. The installation and adjustment method of the continuously adjustable eddy current tuned mass damper according to claim 7, characterized in that: During the welding of the connector, the contact surface between the connector and the tuned mass damper is horizontal.

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