A TMD vibration reduction device with a working switch

Abstract

The present invention belongs to the technical field of structural vibration control, and provides a TMD vibration reduction device with a working switch, which is composed of a top plate, a bottom plate, a guide rod, a compression spring, a viscous damper, a mass block and a spring card. When the vibration acceleration of the controlled structure is small, no control is required, and the spring card embedded in the guide rod constrains the mass block and the viscous damper to not produce relative displacement with the controlled structure, and the damper does not work, which does not affect its service life; when the acceleration of the controlled structure reaches a set threshold, the inertial force of the mass block exceeds the maximum constraint force of the spring card, and the spring card is pressed into the guide rod by the mass block, with only basically negligible friction between them, and the damper starts to work to suppress structural vibration until the acceleration is less than the threshold, the spring card is rebounded to constrain the mass block to be stationary relative to the guide rod and the controlled structure, and the damper stops working. The device avoids inefficient work, greatly prolongs the service life of the TMD, and has good economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of structural vibration control, relates to bridges and building structures, and in particular to a TMD vibration reduction device with a working switch. Background Art

[0002] With the development of civil engineering structures, high-strength materials have been widely used in structures such as bridges and buildings, and large-span bridges, space structures, high-rise buildings, and towering structures are increasing. As the height and span increase, the natural vibration frequency of the structure decreases. Under the action of dynamic loads such as wind, people, vehicles, and earthquakes, it is easy to vibrate significantly, which may affect the comfort of work and drivers and passengers, the safety of vehicle driving, and even cause damage to the bridge or building structure itself, seriously threatening the safety of the structure and personnel. To prevent such structures from vibrating too much, a tuned mass damper can be installed to suppress the vibration within an acceptable range.

[0003] The tuned mass damper (TMD) system is a passive control device for structural vibration composed of a mass block, a spring and a damper, wherein the damper is usually a liquid viscous damper.

[0004] After being installed on a bridge or building structure and put into service, the TMD usually experiences tiny vertical, horizontal and torsional movements caused by daily loads such as wind, vehicles and people. Long-term vibration will inevitably cause wear and aging of the damper components. After the viscous damper reaches a certain number of cycles, oil leakage may even occur, eventually leading to the failure of the TMD.

[0005] In fact, small structural vibrations usually do not need to be controlled. Control is only required when the structure causes discomfort to the human body or even causes structural damage. Therefore, when the structure produces small vibrations that do not affect the normal use of the structure and user comfort, the TMD can be out of working condition. For many actual projects, this can greatly extend the service life of the TMD, and when it is more needed, the working mode can be turned on to maximize its effectiveness. Summary of the invention

[0006] The purpose of the present invention is to propose a new control concept to address the above problems existing in the existing TMD, and to add a working switch to the TMD, with the goal that: under daily micro-vibration acceleration conditions, there is no relative movement between the damper piston and the hydraulic cylinder of the TMD, that is, the damper is in the closed mode; only when the structural vibration acceleration reaches a set threshold (determined according to the human comfort index or the structural safety index), the TMD is turned on to put it in a working state, and stops working when the vibration acceleration is less than the threshold. Obviously, the adoption of this concept can greatly reduce the number of daily vibrations of the TMD and the vibration stroke of the damper, thereby significantly extending the service life of the TMD and reducing costs.

[0007] To achieve the above-mentioned purpose, the present invention discloses a TMD vibration reduction device with a working switch, comprising a top plate, a bottom plate, a guide rod, a compression spring, a viscous damper, a mass block, a bolt, a pin seat and a spring card. The top plate, the bottom plate, the guide rod, the bolt and the pin seat form an integral frame, which is fixed to the controlled structure; the guide rod is fixed between the top plate and the bottom plate by bolts, the guide rod passes through the hole of the mass block, and a suitable gap is left between the guide rod and the mass block to ensure that the mass block can slide freely along the guide rod, the friction force is as small as possible, and no obvious collision occurs; one end of the compression spring is connected to the top plate or the bottom plate, and the other end is connected to the mass block, the mass block is installed between the upper and lower compression springs, the viscous damper is located in the center of the device, the piston rod of the viscous damper is connected to the top plate and the bottom plate by the pin seat, the viscous damper hydraulic cylinder is fixed to the mass block, and is synchronized with the movement of the mass block; the spring card is partially embedded in the guide rod card slot, and the position is adjustable within a certain range, which is used to limit the mass block.

[0008] The spring card can be designed in various forms, and its parameters (width, thickness, length, shape, material, etc.) need to be determined through design calculations, which are mainly determined by the mass of the mass block, the set acceleration threshold and the number of spring cards.

[0009] Under daily small vibration conditions of the controlled structure, the mass block is stuck between the spring cards and basically remains motionless, so the viscous damper does not work, and no relative movement occurs between the damper piston (rod) and the outer wall of the hydraulic cylinder; when the structural vibration acceleration reaches the set limit, the inertia force of the mass block is greater than the maximum resistance of the spring card, and the mass block compresses the spring card and begins to vibrate relative to the controlled structure. After the spring card is compressed, there is a pressure perpendicular to the direction of movement (no work will be done) and sliding friction between the spring card and the mass block (the friction coefficient can be minimized by design. In order to reduce the friction between the mass block and the spring card during vibration and increase the service life of the spring card, a ball can also be added to form rolling friction, but the structure is relatively more complicated. The friction and its work can be basically ignored), the mass block drives the damper to reciprocate, increase the structural damping, and consume energy. When the structural vibration acceleration is small and the inertia force of the mass block cannot overcome the resistance of the spring card, the mass block is stuck between the spring cards again, the vibration of the relative controlled structure stops, and the damper stops working accordingly.

[0010] Effects and benefits of the invention: The invention can significantly shorten the working time and reciprocating stroke of the damper in the TMD, effectively reduce the daily fatigue wear and aging rate of the damper in the TMD, reduce the probability of oil leakage failure, extend the service life of the TMD, reduce its replacement frequency, and significantly improve the economic benefits.

[0011] Engineering application field of the present invention: This TMD vibration reduction device with a working switch is expected to be widely used in large-span bridges, pedestrian bridges with low stiffness, and high-rise, tall, and large-span spatial building structures to control large vertical, horizontal, and torsional vibrations caused by various dynamic loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the planar structure of the present invention.

[0013] Figure 2 It is a schematic diagram of the AA cross-sectional structure of the present invention.

[0014] Figure 3 It is a schematic diagram of the BB cross-sectional structure of the present invention.

[0015] Figure 4 is a schematic diagram of the switch.

[0016] In the figure, 1-top plate; 2-bottom plate; 3-compression spring; 4-guide rod; 5-mass block; 6-viscous damper; 7-spring card; 8-bolt; 9-pin seat. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0018] like Figure 1 , 2 As shown in Figure 3, a TMD vibration reduction device with a working switch includes a top plate 1, a bottom plate 2, a compression spring 3, a guide rod 4, a mass block 5, a viscous damper 6, a spring card 7, a bolt 8, and a pin seat 9; the TMD is installed on the controlled structure as a device for controlling vertical vibration, and the top plate 1 and the bottom plate 2 are fixed to the structure. If necessary, the connection between the structure and the top plate 1 and the bottom plate 2 can be locally strengthened to ensure that the local structure has sufficient rigidity and strength; the four guide rods 4 are fixed between the top plate 1 and the bottom plate 2 by bolts 8, and pass through the mass block 5 with holes, and the holes There is a gap between the mass block 5 and the guide rod 4, so that the mass block 5 can vibrate along the guide rod 4; the compression springs 3 are provided on the upper and lower parts of the mass block 5, and there are two pairs of compression springs, totaling four, which are respectively located between the mass block 5 and the top plate 1 and the bottom plate 2; the viscous damper 6 is located at the center of the structure, and the piston rod of the viscous damper 6 is connected to the top plate 1 and the bottom plate 2 by the pin seat 9, and the hydraulic cylinder of the viscous damper 6 is fixed to the mass block 5 without relative movement; the spring clips 7 are embedded in the guide rod 4 slots at the upper and lower edges of the mass block 5, and two spring clips 7 are arranged on each guide rod 4, and the whole device is provided with a total of eight spring clips 7.

[0019] The mass block 5 is usually in a stationary state relative to the top and bottom plates. When the vibration acceleration of the controlled structure is small, the inertia force of the mass block is also small, which is insufficient to overcome the maximum resistance of the spring card. The hydraulic cylinder of the mass block 5 and the viscous damper 6 is stuck between the spring card 7, and the viscous damper 6 does not participate in the work; when the structural vibration acceleration reaches the set limit (reaching the human comfort limit or the acceleration value that endangers the structural safety), the inertia force of the mass block 5 is greater than the maximum resistance that can be provided by the spring card 7, and the hydraulic cylinder of the viscous damper 6 starts to vibrate relative to the controlled structure. The spring card 7 is flattened into the card slot and there is pressure and sliding friction between it and the mass block 5. The mass block 5 drives the hydraulic cylinder and piston of the viscous damper 6 to move relative to each other, increase the structural damping, and suppress its vibration; when the vibration acceleration of the controlled structure gradually decreases, and the inertia force of the mass block 5 is again less than the resistance of the spring card 7, the mass block 5 and the viscous damper 6 stop vibrating relative to the controlled structure, and the viscous damper 6 stops working again.

[0020] like Figure 4 The diagram shows a switch schematic diagram. The guide rod 4 is slotted at the installation position of the spring card 7, and the spring card 7 is embedded therein. The part in the slot can be stretched and deformed. The parameters of the spring card 7 need to be determined by design calculation, which are mainly determined by the acceleration threshold, the mass of the mass block 5 and the mass of the viscous damper 6 (usually much smaller than the mass of the mass block and can be basically ignored). The schematic diagram only shows one form that the spring card 7 can adopt. Considering the practicality, durability and economy comprehensively, the parameters such as the material, shape, size and so on of the spring card 7 are optimized to meet the use requirements.

[0021] The TMD vibration reduction device with a working switch provided by the present invention can extend the service life of the TMD and reduce the replacement frequency thereof under the premise of ensuring effective control of structural vibration, and is economical, practical, safe and efficient.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A TMD vibration reduction device with a working switch, characterized in that: The TMD vibration damping device with a working switch comprises a top plate (1), a bottom plate (2), a compression spring (3), a guide rod (4), a mass block (5), a viscous damper (6), a spring card (7), a bolt (8) and a pin seat (9); the guide rod (4) is fixed between the top plate (1) and the bottom plate (2) by means of a bolt (8) and passes through the mass block (5) with a hole; the compression spring (3) is located between the mass block (5) and the top plate (1), and between the mass block (5) and the bottom plate (2); the viscous damper (6) is located at the center of the TMD vibration damping device. The piston rod of the viscous damper (6) is connected to the top plate (1) and the bottom plate (2) by a pin seat (9), and the hydraulic cylinder of the viscous damper (6) is fixed to the mass block (5); the spring card (7) is embedded in the upper and lower edges of the mass block (5) on the guide rod (4), and is used to constrain the mass block (5) to remain stationary relative to the guide rod under the condition of being lower than a set acceleration threshold, and when the acceleration exceeds the threshold, the spring card (7) is flattened by the mass block (5) into the card slot of the guide rod (4), and the mass block (5) drives the viscous damper (6) to vibrate and consume energy, thereby suppressing the vibration of the structure; When the mass block (5) vibrates and the viscous damper (6) is working, the friction between the spring card (7) and the mass block (5) is as small as possible to achieve more efficient vibration control.

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