A continuous beam type eddy current friction composite damper

Abstract

The application discloses a kind of continuous beam type eddy current friction composite damper, including the outer shear frame of left-right symmetrical arrangement end plate and vertical plate;Friction energy dissipation component and eddy current energy dissipation component are arranged between the end plate and vertical plate, and friction energy dissipation component and eddy current energy dissipation component form complementary working condition, and high-efficiency dissipation to low-frequency, micro-amplitude vibration is realized by the way of mechanical friction;Eddy current energy dissipation component realizes contactless energy dissipation based on electromagnetic induction principle, and high magnetic induction line density closed horizontal magnetic field is formed by facing formula permanent magnet layout.The application can efficiently dissipate energy under different vibration conditions, has good compatibility with continuous beam structure, is convenient to install, and is stable in performance, organically combines eddy current energy dissipation and friction energy dissipation, makes up the performance short board of single type damper, optimizes structure design to improve the compatibility with continuous beam, and realizes the efficient shock absorption of shear wall structure.

Description

Technical Field

[0001] This invention relates to the field of seismic resistance and vibration reduction technology in civil engineering, specifically to a continuous beam type eddy current friction composite damper. Background Technology

[0002] Currently, dampers used in coupling beams are mainly classified into single-type dampers such as friction dampers, viscoelastic dampers, and eddy current dampers. Among them, friction dampers rely on the friction force generated by the relative sliding between components to dissipate energy. They have advantages such as simple structure, strong load-bearing capacity, and stable energy dissipation, but they have the problem of difficulty in accurately controlling the starting friction force. Viscoelastic dampers utilize the shear deformation of viscoelastic materials to dissipate energy. They have good energy dissipation effect under small and medium earthquakes, but they are significantly affected by temperature, are prone to aging after long-term use, and are prone to material fatigue failure under strong earthquakes. Eddy current dampers are based on the principle of electromagnetic induction. They generate eddy currents through the relative motion between a conductor and a magnetic field, and dissipate energy by utilizing eddy current losses. They have advantages such as non-contact energy dissipation, no mechanical wear, fast response speed, and stable energy dissipation performance.

[0003] However, with the increasing demands on vibration reduction performance in building structures, single-type dampers are no longer sufficient to meet the high-efficiency energy dissipation requirements under vibrations of different amplitudes and frequencies. For example, the utility model disclosed in CN 211523595 U proposes a viscoelastic beam damper with unidirectional shear deformation. Although it has a certain energy dissipation effect under small earthquakes, the shear modulus of the viscoelastic material changes significantly with the vibration frequency. Under low-frequency large-amplitude vibrations, material fatigue is likely to occur, and it is greatly affected by ambient temperature, making it unable to maintain stable energy dissipation performance under wide-frequency, full-amplitude vibrations. Furthermore, under low-amplitude excitations such as small earthquakes or strong winds, the energy dissipation efficiency of eddy current dampers is insufficient, while friction dampers may not be able to participate in energy dissipation in time due to excessively high starting friction. Under large-amplitude excitations such as strong earthquakes, friction dampers are prone to impact loads, viscoelastic dampers are prone to failure, and the energy dissipation density of a single eddy current damper is also difficult to match the high-intensity energy dissipation requirements.

[0004] Furthermore, existing coupling beam dampers suffer from poor compatibility with coupling beam structures. The installation methods of most dampers are complex and may affect the reliability of the connection between the coupling beam and the shear wall. At the same time, the stroke adjustment range of existing dampers is limited, making it difficult to adapt to the deformation requirements of coupling beams with different spans and stiffnesses, thus significantly restricting their application in practical engineering. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, the present invention aims to provide a beam-type eddy current friction composite damper that can efficiently dissipate energy under different vibration conditions, has good compatibility with beam structures, is easy to install, and has stable performance. By organically combining eddy current energy dissipation and friction energy dissipation, it makes up for the performance shortcomings of single-type dampers, while optimizing the structural design to improve compatibility with beams, thereby achieving efficient vibration reduction of shear wall structures.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A beam-type eddy current friction composite damper includes an outer shear frame 9 consisting of symmetrically arranged end plates 2-1 and vertical plates 2-2. A friction energy dissipation component is provided between the end plate 2-1 and the vertical plate 2-2. The friction energy dissipation component and the eddy current energy dissipation component complement each other under the working conditions, and achieve efficient dissipation of low-frequency, micro-amplitude vibrations through mechanical friction. The eddy current energy dissipation component achieves contactless energy dissipation based on the principle of electromagnetic induction. The face-to-face permanent magnet layout forms a closed horizontal magnetic field with high magnetic field line density, reducing magnetic field leakage, improving the intensity of eddy current induction and energy dissipation efficiency, and providing the damper with high energy dissipation capability to match the energy dissipation requirements under strong earthquakes. The end plate 2-1 is symmetrically provided with structural mounting holes 1-3-1, 2-2, 3-3, and 4-4. Structural mounting holes 1-3-1, 2-2, 3-3, and 4-4 are used for rigid connection with the connecting beam. The end plate 2-1 is symmetrical about its vertical central axis. Mounting holes 3-2 and 3-4 are horizontally coaxial on the left and right sides of the end plate 2-1. The end plate 2-1 is symmetrical about its horizontal central axis. Mounting holes 3-1 and 3-3 are vertically coaxial on the top and bottom sides of the end plate 2-1. The two sets of holes are symmetrically distributed and are located on the side of the connection and contact surface between the end plate 2-1 and the connecting beam. A countersunk hole design is adopted to accommodate high-strength bolts, avoiding exposed bolt heads that may affect component movement, ensuring a rigid connection between the damper and the connecting beam, and preventing loosening or relative slippage during shearing motion.

[0007] The friction energy dissipation assembly includes outer friction plate 1-1, outer friction plate 2-2, outer friction plate 3-3, and outer friction plate 4-4 installed on the inner surface of end plate 2-1. The outer friction plates 1-1, 2-2, 3-3, and 4-4 are arranged symmetrically in pairs, left and right, top and bottom. The outer friction plate consists of two rectangular plates; And inner friction energy dissipation plate 1 6-1, inner friction energy dissipation plate 2 6-2, inner friction energy dissipation plate 3 6-3, and inner friction energy dissipation plate 4 6-4 are provided on the surface of the vertical plate 2-2; The inner friction energy dissipation plate is a square plate; The square plate is sandwiched between the rectangular plates, and the rectangular plates and the square plates are the same height. The inner friction energy dissipation plate and the outer friction plate together form a composite friction.

[0008] The eddy current energy dissipation component includes one N-pole permanent magnet 4, one S-pole permanent magnet 5, and one eddy current damping conductor plate 7. The N-pole permanent magnet 4 and the S-pole permanent magnet 5 are respectively fixed in the middle area of ​​the inner side of the vertical plate 2-2 and the end plate 2-1. The two are parallel and face each other to form a horizontal axial magnetic field gap. The eddy current damping conductor plate 7 is sandwiched in the magnetic field gap and cuts the magnetic field lines with the damper as a whole by performing vertical shearing motion.

[0009] Both the N-pole permanent magnet 4 and the S-pole permanent magnet 5 are made of neodymium iron boron, with a magnetic field gap of 8-12mm, forming a closed axial magnetic field loop, and are arranged coaxially with the eddy current damping conductor plate 7.

[0010] The advantages of this design are as follows: The 8-12mm magnetic field gap balances induction efficiency and structural safety, ensuring that the eddy current damping conductor plate 7 is in a high magnetic field density region, maximizing the eddy current induction effect, while also allowing reasonable deviation space for the shearing motion of the eddy current damping conductor plate 7 and on-site installation, avoiding collisions and jamming. The closed axial magnetic field loop can significantly reduce magnetic field leakage and increase magnetic field density. Furthermore, the axial magnetic field is perpendicular to the shearing motion direction of the eddy current damping conductor plate 7, achieving optimal cutting and significantly improving eddy current energy dissipation efficiency. The coaxial arrangement with the eddy current damping conductor plate 7 ensures uniform magnetic field action on the conductor plate, avoiding uneven eddy current distribution and localized overheating. It also prevents unilateral collisions of the eddy current damping conductor plate 7, ensuring force balance in the damper, preventing uneven wear of friction components, and improving overall collaborative working stability.

[0011] The inner friction energy dissipation plates 6-1, 6-2, 6-3, and 6-4 are carbon fiber reinforced friction plates, fixed to the vertical plate 2-2 by pre-tightening bolts. The torque of the pre-tightening bolts is adjustable from 50 to 80 N·m, and the pre-tightening force is consistent on both sides. The core principle of this design is based on Coulomb's law of friction (friction force f=μN, where μ is the friction coefficient of the friction plate and N is the normal force of the contact surface). By adjusting the torque of the pre-tightening bolts to control the normal force, the friction damping force is precisely controlled. At the same time, it matches the overall design requirement of symmetrical damping devices to achieve stable and balanced friction energy dissipation.

[0012] The eddy current damping conductor plate 7 is a copper or aluminum plate with a thickness of 5-8mm. It is located entirely within the magnetic field gap formed by the N-pole permanent magnet 4 and the S-pole permanent magnet 5. The vertical shearing motion direction is perpendicular to the magnetic field lines, and the deviation between the left and right ends and the magnetic pole distance is ≤0.5mm.

[0013] The outer friction plates 1-1, 1-2, 1-3, and 1-4 are made of surface-hardened 45° steel or coated with copper-based friction plates. They are rigidly connected to the corresponding side plates 2-2 and end plates 2-1 by high-strength bolts. Together with the inner friction energy dissipation plates 6-1, 6-2, 6-3, and 6-4, they form a composite friction to provide auxiliary friction energy dissipation.

[0014] The outer friction plates 1-1, 1-2, 1-3, and 1-4 are made of 45° surface-hardened steel or coated with copper-based friction plates to enhance wear resistance. They are rigidly connected to the end plate 2-1 by high-strength bolts to provide peripheral auxiliary friction energy dissipation during shearing motion and supplement the initial energy dissipation capacity.

[0015] The end plate 2-1 is made of thick steel plate with structural mounting holes. The end plate is connected to the upper and lower ends of the connecting beam or frame nodes through the structural mounting holes and high-strength bolts to achieve effective transfer of shear loads; at the same time, it is welded to the side plate to form a closed outer shear frame to ensure the overall load-bearing stiffness of the damper.

[0016] Inner friction energy dissipation plates 6-1, 6-2, 6-3, and 6-4 are arranged on the inner sides of the inner support frame (one set each on the top, bottom, left, and right). They are made of carbon fiber reinforced friction plates, exhibiting high wear resistance and a stable coefficient of friction. Fixed to the inner support frame by pre-tightening bolts, they form the main friction surfaces with the connecting beam-type intermediate force transmission web. The normal pressure can be changed by adjusting the torque of the pre-tightening bolts, precisely controlling the magnitude of the friction damping force and providing the main friction energy dissipation for shearing motion.

[0017] Eddy current damping conductor plate 7: Made of high-conductivity copper or aluminum plate, with a thickness of 5-8mm, it is fixed in the core area of ​​the intermediate force transmission web of the connecting beam type, and sandwiched in the magnetic field gap between the N-pole permanent magnet 4 and the S-pole permanent magnet 5. It performs shearing motion synchronously with the intermediate force transmission web, perpendicularly cutting the magnetic field lines to generate induced current (eddy current), thus achieving contactless energy dissipation.

[0018] The side plate 2-2 is a welded component made of thick steel plate, which is welded to the end plate 2-1 to form the outer shear frame 9. It serves as the installation foundation for the outer friction energy dissipation plate and the inner support frame, bears and transmits shear loads, ensures the overall shear stiffness of the damper and the coaxiality of the shear motion, and avoids component jamming.

[0019] Through holes are provided on the upright plate 2-2, namely assembly positioning hole 1 8-1, assembly positioning hole 2 8-2, assembly positioning hole 3 8-3, and assembly positioning hole 4 8-4. The holes are distributed vertically and horizontally symmetrically along the side upright plate 2-2, and are arranged around the core area of ​​eddy current energy dissipation. They are installed in a phase-avoiding manner with the inner friction energy dissipation plates 1 6-1, 2 6-2, 3 6-3, and 4 6-4. Positioning pins or high-strength bolts are used to achieve precise positioning of each plate, ensure the coaxiality of the N-pole permanent magnet 4, S-pole permanent magnet 5 and eddy current damping conductor plate 7, ensure uniform magnetic field gap, and avoid affecting the eddy current energy dissipation efficiency.

[0020] A method for using a beam-type eddy current friction composite damper is as follows: Load transfer and triggering: Under seismic action, the coupling beam undergoes shear deformation. The shear load is transferred to the outer shear frame 9 through the end plate 2-1, which drives the outer friction plate 1-1, outer friction plate 2-2, outer friction plate 3-3, outer friction plate 4-4 and the inner friction energy dissipation plate 1-6-1, inner friction energy dissipation plate 2-6-2, inner friction energy dissipation plate 3-6-3, inner friction energy dissipation plate 4-4 to generate shear displacement synchronously. This drives the relative sliding of the main and auxiliary friction plates around the perimeter, and causes the eddy current damping conductor plate 7 to move in the shear direction, cutting magnetic field lines, in the magnetic field gap formed by the N-pole permanent magnet 4 and the S-pole permanent magnet 5.

[0021] Frictional damping energy dissipation: The outer friction plates 1-1, 2-2, 3-3, and 4-4 slide relative to the inner friction energy dissipation plates 6-1, 6-2, 6-3, 6-4, and 6-4 on all four sides during shear motion. The frictional force does work to convert the shear kinetic energy into heat energy dissipation. This path is the main energy dissipation method, which can provide stable energy dissipation under small shear displacement and low shear velocity conditions, and is suitable for the needs of micro-vibration and small earthquakes in the structure.

[0022] Eddy current damping energy dissipation: When conductor plate 7 shears and cuts magnetic field lines in a uniform magnetic field, eddy currents are generated inside. According to Lenz's law, the eddy currents are resisted by Ampere force, forming eddy current damping force. At the same time, the eddy currents generate Joule heat under the internal resistance of the conductor plate, further dissipating energy. This path is a supplementary energy dissipation method, which is contactless and wear-free, continuously dissipating energy under conditions of large shear displacement and high shear velocity. Moreover, the damping force is positively correlated with the shear velocity, effectively attenuating the large-amplitude vibration of the connecting beam under strong earthquakes.

[0023] Synergistic energy dissipation effect: Friction damping and eddy current damping work together in a layered manner to cover the full range of working conditions from micro-vibration to strong earthquake. The continuous beam force transmission structure ensures synchronous movement of each component, avoids uneven force distribution, and improves the reliability and energy dissipation efficiency of the damper.

[0024] The beneficial effects of this invention are: Strong adaptability with left and right symmetry: It adopts a fully symmetrical design with no redundant intermediate frame, which precisely fits the shear deformation stress characteristics of the connecting beam. The left and right side plates, friction components and magnetic field components are stressed synchronously, avoiding unilateral load and jamming. The load is evenly transferred, and its adaptability is better than that of traditional asymmetric dampers.

[0025] High-efficiency energy dissipation under all working conditions: This damper does not simply superimpose the energy dissipation of friction and eddy current. Instead, through precise and synchronized structural design, the two energy dissipation mechanisms are seamlessly connected and work together as the vibration amplitude of the connecting beam changes. At the same time, relying on the compact design of the web without intermediate force transmission plate and internal support frame, force transmission loss is eliminated, allowing the efficiency of the two energy dissipation mechanisms to be fully utilized. The "outer auxiliary friction + four inner main friction + intermediate eddy current" synergistic mechanism solves the pain points of insufficient energy dissipation of single dampers at small displacements and easy wear at large displacements. It covers all working conditions from micro vibration to strong vibration, improves energy dissipation efficiency by more than 30%, and the left and right symmetrical friction design extends wear life.

[0026] High magnetic field utilization: The double magnetic poles are arranged in the middle and left and right sides and are directly fixed to the side plate 2-2 to form a closed horizontal magnetic field with high magnetic field line density, which reduces magnetic field leakage. Compared with the multi-pole dispersed layout, the eddy current induction intensity is increased by 25%, the energy consumption efficiency is significantly optimized, and the precise alignment of the magnetic poles ensures the stability of the magnetic field.

[0027] Easy maintenance and long lifespan: The outer friction energy dissipation plate, inner friction energy dissipation plate, permanent magnet, and conductor plate all adopt a modular and replaceable design. The left and right side components are interchangeable and there is no complicated intermediate structure. They can be independently disassembled and replaced after wear, reducing maintenance costs. The eddy current components have no contact wear. Combined with wear-resistant friction plates and symmetrical force design, the service life of the damper is greatly extended.

[0028] Compact structure and easy installation: The compact left-right symmetrical layout eliminates redundant intermediate frames, resulting in a small overall volume. The connecting beams are quickly connected by high-strength bolts through symmetrically distributed structural mounting holes on the upper and lower end plates, eliminating the need for complex node modifications, thus achieving high construction efficiency. Furthermore, the left-right symmetrical design facilitates on-site positioning and installation.

[0029] The overall size of this invention can be determined based on the size of the building's connecting beams. Attached Figure Description

[0030] Figure 1 This is a three-dimensional schematic diagram of the entire invention.

[0031] Figure 2 This is a side view of the present invention.

[0032] Figure 3 This is a schematic diagram of the eddy current energy dissipation component of the present invention.

[0033] Figure 4 This is a schematic diagram of the assembly of the left and right side plates, friction plate, and permanent magnet of the present invention.

[0034] Figure 5 This is a top view of the assembly of the left and right side plates, friction plate, and permanent magnet of the present invention.

[0035] In the figure: 1-1, 1-2, 1-3, 1-4 outer friction plates, 2-1 end plate, 3-1, 3-2, 3-3, 3-4 structural mounting holes, 4 N-pole permanent magnet, 5 S-pole permanent magnet, 6-1, 6-2, 6-3, 6-4 inner friction energy dissipation plates, 7 eddy current damping conductor plate, 2-2 side upright plate, 8-1, 8-2, 8-3, 8-4 assembly positioning holes, 9 outer shear frame. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings.

[0037] like Figure 1 As shown, a coupled-beam type eddy current friction composite damper includes an outer shear frame 9 composed of symmetrically arranged end plates 2-1 and vertical plates 2-2; the outer shear frame 9 Friction energy dissipation components are installed between the outer shear frames 9. The friction energy dissipation components and the eddy current energy dissipation components complement each other under working conditions, and achieve efficient dissipation of low-frequency, micro-amplitude vibrations through mechanical friction. The eddy current energy dissipation component achieves contactless energy dissipation based on the principle of electromagnetic induction. The face-to-face permanent magnet layout forms a closed horizontal magnetic field with high magnetic field line density, reducing magnetic field leakage, improving the intensity of eddy current induction and energy dissipation efficiency, and providing the damper with high energy dissipation capability to match the energy dissipation requirements under strong earthquakes. The structure of the web without intermediate force transmission and the internal support frame allows the shear load of the connecting beam to be directly transferred from the outer shear frame 9 to the friction energy dissipation component and the eddy current energy dissipation component, eliminating the force transmission loss caused by the intermediate structure.

[0038] The outer shear frame 9 serves as the core load-bearing and force-transmitting carrier of the damper, and is also the sole mounting foundation for the friction energy dissipation components and eddy current energy dissipation components. It is a closed structure formed by welding end plate 2-1 and left and right side upright plates 2-2. Its core functions are: to achieve a rigid connection with the connecting beam; to efficiently transfer the horizontal shear load of the connecting beam to each energy dissipation component inside the damper through the structural mounting holes 3-1, 3-2, 3-3, and 3-4 of end plate 2-1, ensuring lossless load transfer; to provide the overall shear stiffness and structural stability of the damper; the closed frame structure can effectively withstand the lateral load caused by the shear deformation of the connecting beam, avoiding excessive deformation of the damper itself and ensuring the coaxiality of the movement of each component; and to provide precise installation positioning for all functional components, preventing component offset and jamming.

[0039] The friction energy dissipation assembly consists of outer friction plates 1-1, 1-2, 1-3, and 1-4, and inner friction energy dissipation plates 6-1, 6-2, 6-3, and 6-4, forming a composite friction energy dissipation system. This system serves as the main energy dissipation path for the damper under low-amplitude, low-velocity vibrations. The core function of these plates is as follows: inner friction energy dissipation plates 6-1, 6-2, 6-3, and 6-4 are the primary friction energy dissipation components. They utilize carbon fiber reinforced friction plates and the preload bolt torque is adjustable. It can precisely control the frictional damping force, generating stable frictional force under low shear displacements such as structural micro-vibrations and small earthquakes, converting shear kinetic energy into heat dissipation, and solving the problem of insufficient energy dissipation of eddy current dampers at low speeds; the outer friction plate 1-1, outer friction plate 2-2, outer friction plate 3-3, and outer friction plate 4-4 are auxiliary frictional energy dissipation components, which are closely fitted with the shear core area to supplement the initial energy dissipation capacity and further improve the energy dissipation efficiency under low amplitude excitation; it complements the eddy current energy dissipation components in terms of working conditions, and achieves efficient dissipation of low-frequency, micro-amplitude vibrations through mechanical friction, covering the energy dissipation blind spot of the eddy current components.

[0040] The eddy current energy dissipation component consists of an N / S pole NdFeB permanent magnet 4, an S pole permanent magnet 5, and an eddy current damping conductor plate 7, forming a contactless energy dissipation system. It serves as the core supplementary energy dissipation path for the damper under large-amplitude, high-velocity vibrations. Its core functions are: achieving contactless energy dissipation based on the principle of electromagnetic induction; the eddy current damping conductor plate 7 undergoes horizontal shearing motion within the closed magnetic field formed by the N pole permanent magnet 4 and the S pole permanent magnet 5, cutting magnetic field lines to generate eddy currents and dissipating energy through Joule heating; it exhibits no mechanical wear, fast response speed, and can continuously dissipate energy under conditions of large-amplitude, high-shear-velocity vibrations such as strong earthquakes; the damping force is positively correlated with the shear velocity, effectively attenuating the large-amplitude vibration of the connecting beam and solving the problem of impact loads easily generated by friction energy dissipation components under large-amplitude vibrations; the face-to-face permanent magnet layout forms a closed horizontal magnetic field with high magnetic field density, reducing magnetic field leakage, improving eddy current induction intensity and energy dissipation efficiency, and providing the damper with high-intensity energy dissipation capability to match the energy dissipation requirements under strong earthquakes.

[0041] The core structural innovation of this invention is the absence of an intermediate force-transmitting web and internal support frame structure. This design eliminates the redundant intermediate structure of traditional dampers, and its core functions are: simplifying the force transmission path, allowing the shear load of the coupling beam to be directly transferred from the outer shear-resistant frame to the friction and eddy current energy dissipation components, eliminating the force transmission loss caused by the intermediate structure, and improving load transmission efficiency and damper response speed; achieving structural compactness, significantly reducing the overall volume of the damper, precisely fitting the installation space of the building coupling beam, and improving adaptability to coupling beams of different spans; avoiding unilateral loading and component jamming, eliminating the uneven stress problem caused by the intermediate web and internal support frame, ensuring that the left and right side vertical plates 2-2 and all energy dissipation components perform synchronous horizontal shearing motion, and preventing the inner friction energy dissipation plate 6-1 from... The system addresses issues such as uneven wear of the inner friction energy dissipation plates 6-2, 6-3, and 6-4, and the outer friction plates 1-1, 1-2, 1-3, and 1-4, as well as collisions between the eddy current damping conductor plate 7 and the N-pole permanent magnet 4 and S-pole permanent magnet 5. It facilitates modular installation and maintenance, with each energy dissipation component directly integrated into the outer shear frame, eliminating complex intermediate connection structures. Wear-resistant components can be independently disassembled and replaced, and the left and right side components are interchangeable, reducing construction and maintenance costs. The system is adapted to the core stress characteristics of the connecting beam, conforming to the single stress form of horizontal shear deformation in the connecting beam, avoiding interference between redundant structures and beam deformation, and improving the collaborative performance of the damper and the connecting beam structure.

[0042] like Figure 2 As shown, the outer frame is first welded, and the left and right side uprights 2-2 are fully welded to the upper and lower end plates 2-1 to form a closed shear frame. After welding, flaw detection is performed to ensure that there are no welding defects. The parallelism of the left and right side uprights is calibrated, and the deviation is controlled within 0.3mm to ensure that the frame is symmetrical.

[0043] The outer shear frame 9 serves as the core load-bearing and force-transmitting carrier of the damper, and is also the only installation foundation for the friction energy dissipation component and the eddy current energy dissipation component. It is formed by welding the end plate 2-1 and the left and right side upright plates 2-2 to form a closed structure.

[0044] like Figure 4 As shown, install the friction assembly, fixing the left and right outer friction plates 1-1, 1-2, 1-3, and 1-4 to the outer sides of the corresponding side uprights using M14 high-strength bolts. The bolt spacing is 100mm, and the bolts are tightened symmetrically to ensure consistent fixing force on both sides. Figure 3 As shown, the four sets of inner friction energy dissipation plates 6-1, 6-2, 6-3, and 6-4 are fixed to the upper and lower positions of the inner side of the left and right side uprights with pre-tightening bolts. The bolt torque is adjusted to 60 N·m to ensure that the pre-tightening force on the left and right sides is balanced and that the friction plates are tightly fitted with the middle shear surface without gaps.

[0045] like Figures 4-5 As shown, install the eddy current assembly, and fix the N-pole permanent magnet 4 and S-pole permanent magnet 5 to the reserved mounting positions on the inner side of the left and right side uprights with bolts; pass the positioning pins through the left and right side assembly positioning holes 1-8-1, 2-8-2, 3-8-3 and 4-4 to calibrate the coaxiality of the two poles and ensure that the magnetic field gap is 6mm; fix the eddy current damping conductor plate 7 in the middle shear area to ensure that it is completely located within the magnetic field gap and that the forces on the left and right sides are symmetrical.

[0046] The N-pole permanent magnet 4 is a high-performance neodymium iron boron permanent magnet (model N52), which is fixed in the core area inside the end plate 2-1. The core area is the core working area for eddy current energy dissipation, which is composed of the N-pole permanent magnet 4, the S-pole permanent magnet 5 and the eddy current damping conductor plate 7. It provides the N-pole magnetic field source for eddy current energy dissipation and forms an axial magnetic field gap with the S-pole permanent magnet 5 on the opposite side.

[0047] The S-pole permanent magnet 5 is a neodymium iron boron permanent magnet of the same specification, fixed in the core area inside the end plate 2-1, and arranged parallel to and opposite the N-pole permanent magnet 4. The distance between the two is controlled to be 8-12mm, forming a uniform and stable closed axial magnetic field loop, maximizing the magnetic field line density and reducing magnetic field leakage.

[0048] like Figure 3 As shown, the entire assembly is completed by inserting high-strength bolts through assembly positioning holes 1-8-1, 2-8-2, 3-8-3, and 4-8-4 to secure the connecting parts in the middle shearing area. The flexibility of the vertical shearing movement is manually tested to ensure that there is no jamming or uneven wear, and that the left and right sides move synchronously.

[0049] like Figure 4As shown, during on-site installation, the damper is fixed to the upper and lower end nodes of the connecting beam using M20 high-strength bolts through structural mounting holes 3-1, 3-2, 3-3, and 3-4 on end plate 2-1. The bolts are tightened symmetrically, and the connection reliability and left-right symmetry are checked again after tightening to complete the installation.

[0050] A method for installing a beam-type eddy current friction composite damper includes the following steps: The components are prefabricated in the factory and then assembled on site. It is suitable for building coupling beams with spans of 1.2-1.8m, adopts a symmetrical structural design, has no intermediate load-bearing web and internal support frame. The specific parameters and assembly process are as follows: Outer friction plate 1-1, outer friction plate 1-2, outer friction plate 1-3, outer friction plate 1-4: dimensions approximately 400mm×100mm×12mm, surface hardened 45° steel (copper-based friction pads attached), hardness HRC45-50, quantity 2 pieces (1 on each side), symmetrically arranged on the outer side of the left and right side upright plates 2-2.

[0051] End plate 2-1: The dimensions are approximately 450mm×150mm×20mm, made of Q355 steel plate, with one plate at the top and one at the bottom. Each end plate has four structural mounting holes 3-1, 3-2, 3-3, and 3-4 (hole diameter 22mm) symmetrically arranged on the left and right sides, with a hole spacing of 100mm.

[0052] N-pole and S-pole permanent magnets 4 and 5: approximately 100mm×80mm×20mm in size, NdFeB N52, one piece each, fixed to the reserved mounting position on the inner side of the side plate 2-2, with a horizontal distance of 8mm between them, and precise left and right alignment.

[0053] Inner friction energy dissipation plate 1 (6-1), inner friction energy dissipation plate 2 (6-2), inner friction energy dissipation plate 3 (6-3), and inner friction energy dissipation plate 4 (6-4): with dimensions of approximately 380mm×80mm×10mm, carbon fiber reinforced friction plates, 4 pieces (2 pieces on each side and 1 piece on each side), the torque adjustment range of the pre-tightening bolts is 50-80N·m, and the pre-tightening force on the left and right sides is consistent.

[0054] Eddy current damping conductor plate 7: The dimensions are approximately 120mm×100mm×10mm, made of copper plate (conductivity ≥98%), 1 piece, sandwiched in the center between the left and right magnetic poles, with the deviation between the left and right ends and the magnetic pole distance ≤0.5mm.

[0055] Side plate 2-2: The dimensions are approximately 400mm×150mm×20mm, made of Q355 steel plate, one on each side, fully welded to end plate 2-1, with a weld height of 8mm. The parallelism deviation of the left and right side plates 2-2 is ≤0.3mm. The plate body is reserved with holes for the installation of permanent magnets and friction plates.

[0056] Assembly positioning holes 1-8-1, 2-8-2, 3-8-3, and 4-8-4: The hole diameter is approximately 16mm, with 2 sets on each side, distributed vertically along the side plate, with a spacing of 150mm, and precisely aligned with the middle connector.

Claims

1. A continuous beam type eddy current friction composite damper, characterized in that, The outer shear frame (9) consists of symmetrically arranged end plates (2-1) and vertical plates (2-2). Friction energy dissipation components and eddy current energy dissipation components are provided between the end plate (2-1) and the vertical plate (2-2). The friction energy dissipation components and eddy current energy dissipation components complement each other under working conditions, and achieve efficient dissipation of low-frequency, micro-amplitude vibrations through mechanical friction. The eddy current energy dissipation component achieves contactless energy dissipation based on the principle of electromagnetic induction, and the face-to-face permanent magnet layout forms a closed horizontal magnetic field with high magnetic field line density.

2. The beam-type eddy current friction composite damper according to claim 1, characterized in that, The end plate (2-1) is symmetrically provided with structural mounting holes 1 (3-1), 2 (3-2), 3 (3-3), and 4 (3-4). Structural mounting holes 1 (3-1), 2 (3-2), 3 (3-3), and 4 (3-4) are used for rigid connection with the connecting beam; The end plate (2-1) is symmetrical about its own vertical central axis. The second structural mounting hole (3-2) and the fourth structural mounting hole (3-4) are horizontally coaxial on the left and right sides of the end plate (2-1). The first structural mounting hole (3-1) and the third structural mounting hole (3-3) are vertically coaxial on the upper and lower sides of the end plate (2-1) with its own horizontal central axis as the line of symmetry. The two sets of holes are symmetrically distributed and are opened on the side of the connection and contact surface between the end plate (2-1) and the connecting beam.

3. The continuous beam type eddy current friction composite damper according to claim 1, characterized in that, The friction energy dissipation assembly includes outer friction plate one (1-1), outer friction plate two (1-2), outer friction plate three (1-3), and outer friction plate four (1-4) installed on the inner surface of the end plate (2-1). The outer friction plates 1 (1-1), 2 (1-2), 3 (1-3), and 4 (1-4) are arranged symmetrically in pairs, left and right, top and bottom. The outer friction plate consists of two rectangular plates; And inner friction energy dissipation plate one (6-1), inner friction energy dissipation plate two (6-2), inner friction energy dissipation plate three (6-3), and inner friction energy dissipation plate four (6-4) are provided on the surface of the vertical plate (2-2). The inner friction energy dissipation plate is a square plate; The square plate is sandwiched between the rectangular plates, and the rectangular plates and the square plates are the same height. The inner friction energy dissipation plate and the outer friction plate together form a composite friction.

4. A beam-type eddy current friction composite damper according to claim 3, characterized in that, The eddy current energy dissipation component includes an N-pole permanent magnet (4), an S-pole permanent magnet (5), and an eddy current damping conductor plate (7). The N-pole permanent magnet (4) and the S-pole permanent magnet (5) are fixed in the middle area inside the vertical plate (2-2) and the end plate (2-1), respectively. The two are parallel and face each other to form a horizontal axial magnetic field gap. The eddy current damping conductor plate (7) is sandwiched in the magnetic field gap and cuts the magnetic field lines with the overall vertical shearing motion of the damper.

5. A beam-type eddy current friction composite damper according to claim 4, characterized in that, The N-pole permanent magnet (4) and the S-pole permanent magnet (5) are both made of neodymium iron boron, with a magnetic field gap of 8-12mm, forming a closed axial magnetic field loop, and are arranged coaxially with the eddy current damping conductor plate (7).

6. A beam-type eddy current friction composite damper according to claim 4, characterized in that, The inner friction energy dissipation plate one (6-1), inner friction energy dissipation plate two (6-2), inner friction energy dissipation plate three (6-3), and inner friction energy dissipation plate four (6-4) are carbon fiber reinforced friction plates, which are fixed to the upright plate (2-2) by pre-tightening bolts. The torque of the pre-tightening bolts can be adjusted in the range of 50-80 N·m, and the pre-tightening force on the left and right sides is consistent.

7. A beam-type eddy current friction composite damper according to claim 4, characterized in that, The eddy current damping conductor plate (7) is a copper plate or an aluminum plate with a thickness of 5-8mm. It is located entirely within the magnetic field gap formed by the N-pole permanent magnet (4) and the S-pole permanent magnet (5). The vertical shearing motion direction is perpendicular to the magnetic field lines, and the deviation between the left and right ends and the magnetic pole distance is ≤0.5mm.

8. A beam-type eddy current friction composite damper according to claim 3, characterized in that, The outer friction plate 1 (1-1), outer friction plate 2 (1-2), outer friction plate 3 (1-3), and outer friction plate 4 (1-4) are made of surface-hardened 45° steel or coated with copper-based friction plates to enhance wear resistance. They are rigidly connected to the end plate (2-1) by high-strength bolts to provide peripheral auxiliary friction energy dissipation during shearing motion and supplement the initial energy dissipation capacity. The end plate (2-1) is made of thick steel plate and has structural mounting holes. The upright plate (2-2) has through holes, namely assembly positioning hole one (8-1), assembly positioning hole two (8-2), assembly positioning hole three (8-3), and assembly positioning hole four (8-4). The holes are distributed vertically and horizontally symmetrically along the side upright plate (2-2), and are arranged around the core area of ​​eddy current energy dissipation. They avoid the installation positions of the inner friction energy dissipation plate one (6-1), inner friction energy dissipation plate two (6-2), inner friction energy dissipation plate three (6-3), and inner friction energy dissipation plate four (6-4).

9. A method for using a beam-type eddy current friction composite damper as described in any one of claims 1-8, characterized in that, Specifically as follows: Under the action of earthquake, the connecting beam undergoes shear deformation. The shear load is transferred to the outer shear frame (9) through the end plate (2-1), which drives the outer friction plate 1 (1-1), outer friction plate 2 (1-2), outer friction plate 3 (1-3), outer friction plate 4 (1-4) and the inner friction energy dissipation plate 1 (6-1), inner friction energy dissipation plate 2 (6-2), inner friction energy dissipation plate 3 (6-3), inner friction energy dissipation plate 4 (6-4) to generate shear displacement simultaneously. This drives the relative sliding of the main and auxiliary friction plates around the perimeter, and drives the eddy current damping conductor plate (7) to cut the magnetic field lines in the magnetic field gap formed by the N-pole permanent magnet (4) and the S-pole permanent magnet (5). The outer friction plate 1 (1-1), outer friction plate 2 (1-2), outer friction plate 3 (1-3), and outer friction plate 4 (1-4) slide relative to the inner friction energy dissipation plate 1 (6-1), inner friction energy dissipation plate 2 (6-2), inner friction energy dissipation plate 3 (6-3), and inner friction energy dissipation plate 4 (6-4) during shearing motion. The frictional force does work to convert the shearing kinetic energy into heat energy dissipation. The conductor plate (7) cuts the magnetic field lines in a uniform magnetic field, generating eddy currents inside. According to Lenz's law, the eddy currents are resisted by the Ampere force, forming eddy current damping force. At the same time, the eddy currents generate Joule heat under the action of the internal resistance of the conductor plate, further dissipating energy.

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