A kind of inertial capacity multi-directional tuning energy absorption and vibration reduction device

Abstract

The present invention belongs to the technical field of vibration reduction of engineering structures, and specifically relates to a multi-directional tuned energy absorption and vibration reduction device. An inertia-capacity multi-directional tuned energy absorption and vibration reduction device, comprising an inertia-capacity device and a mass tuning device installed in a main frame; the mass tuning device is connected to the inertia-capacity device; the inertia-capacity device and the mass tuning device are connected to the main frame through elastic elements. The present invention achieves the inertia-capacity effect by changing the structural form of the mass block, improves the mass tuning method of the vibration reduction device, and improves the energy absorption and energy consumption efficiency of the vibration reduction device.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering structure vibration reduction, and in particular relates to a multi-directional tuning energy absorption and vibration reduction device. Background Art

[0002] In recent years, with the development of social economy, high-rise and super-high-rise buildings have emerged in large numbers, and tall structures have also been built in large numbers. Due to the characteristics of high flexibility and low damping of high-rise and tall structures, traditional design methods are difficult to balance the economic and seismic and wind resistance requirements under strong winds and earthquakes. How to further improve the safety of engineering structures under external excitation and meet the functional requirements while ensuring the economic efficiency of the project has attracted widespread attention.

[0003] Vibration reduction and control technology is considered to be a relatively economical technical means to reduce the vibration response of engineering structures. Reasonable and effective vibration reduction and control measures can appropriately reduce the dynamic response of high-rise and tall structures under the excitation of wind vibration, earthquake, etc., and significantly improve the disaster prevention capacity of structures under the premise of controllable engineering costs.

[0004] The traditional tuned mass damper (TMD) system is a vibration control system composed of three major components: mass block, elastic element and damping element. When external force is applied to the main structure, the tuned mass damper system can be driven to vibrate together. Reasonable tuning design allows energy to be transferred from the main structure to the mass block and then dissipated by the energy dissipation damping element, thereby achieving the effect of suppressing the vibration of the main structure.

[0005] However, the existing mainstream tuned mass dampers are designed based on linear stiffness and damping, and can only produce narrow-band vibration absorption for the target frequency. They have poor robustness and cannot effectively meet the multi-dimensional vibration reduction requirements in the actual situation. Once the vibration frequency of the main structure deviates from the theoretical design value, or the stiffness of the main structure degrades under earthquake or dynamic action, the vibration reduction effect of the traditional linear tuned mass damper will be significantly reduced. In order to improve the vibration reduction effect, traditional tuned mass dampers based on linear stiffness and damping often require a large tuning mass, or usually need to be matched with other limit elements to control its stroke, which increases the cost of design and construction, and has a small scope of application, making it difficult to implement in actual engineering. Summary of the invention

[0006] The purpose of the present invention is to solve the defects of the existing traditional tuned mass damper (TMD) system and provide an inertial capacity multi-directional tuned energy absorption and vibration reduction device. The device of the present invention can not only reduce the mass of the required mass block, but also control the vibration in multiple directions to reduce the dynamic response of high-rise and tall structures under wind loads, earthquakes, etc., to achieve the result of energy dissipation and vibration reduction; the present invention improves the energy dissipation efficiency of the system without adding additional tuning mass by coupling the tuned mass damper system and the inertial capacity system, and significantly improves the vibration reduction effect.

[0007] The technical solution adopted by the present invention to solve its technical problems is: an inertia capacity multi-directional tuning energy absorption and vibration reduction device, including an inertia capacity device and a mass tuning device installed in a main frame; the mass tuning device is connected to the inertia capacity device; the inertia capacity device and the mass tuning device are connected to the main frame through an elastic element.

[0008] Furthermore, the mass tuning device comprises a box body, and an external bearing is arranged outside the box body; the external bearing is connected to the main frame through a second spring.

[0009] Furthermore, the inertia container device includes a rotating disc; the rotating disc is fixed in the box body through a central rotating shaft.

[0010] Furthermore, the inertia device includes a pulley turntable and a ball screw; both ends of the ball screw are fixed on the inner side of the pulley turntable; and the nut of the ball screw is connected to the central shaft through a transmission device.

[0011] Furthermore, the upper part of the pulley turntable is connected to a sliding device via a connecting rod, and moves in a plane under the guidance of the sliding device.

[0012] Furthermore, the transmission device includes a first bevel gear and a second bevel gear; the first bevel gear is sleeved on the nut of the ball screw; a fixing plate is provided at the tail of the first bevel gear, and the lower end of the fixing plate is fixed to the top of the box; the first bevel gear is connected to the fixing plate through a bearing, and the ball screw passes through the inside of the bearing; the second bevel gear is connected to the central shaft through another bearing fixed on the top of the box; the first bevel gear and the second bevel gear are meshed.

[0013] Furthermore, both ends of the sliding device are embedded in the annular groove and perform circular motion under the guidance of the annular groove.

[0014] Furthermore, the pulley turntable is connected to the connecting rod via a ball pulley, so that it performs circular motion along the connecting rod.

[0015] Furthermore, the mass tuning device also includes a plurality of damping and energy dissipation devices; the energy dissipation and damping devices are arranged at equal intervals, one end of which is fixed on the outer bearing, and the other end is connected to the inertia device through a transfer rod.

[0016] Furthermore, a first spring is provided between the transfer rod and the frame column.

[0017] The present invention has the following beneficial effects:

[0018] (1) When the structure vibrates significantly under wind load and earthquake, the mass block can move in all directions within the plane, thus achieving multi-directional vibration reduction control of the structure;

[0019] (2) The mass unit inside the box is designed to be a rotatable and detachable disc. The shape, size and number of the disc can be adjusted according to the frequency response characteristics of the controlled structure and the control target. The disc rotates while moving horizontally, and the rotational inertia of the disc is used to achieve the purpose of temporary rotational energy storage, which is the inertia capacity. By utilizing the characteristics of the inertia capacity element, the temporarily stored kinetic energy is further absorbed and dissipated by the damper, thereby improving the efficiency of vibration reduction and energy consumption;

[0020] (3) The device uses a common mass block for vibration reduction control in multiple directions, and the mass block and the inertia unit are coupled together, which effectively reduces the total mass of the vibration reduction device and reduces the additional load on the main structure.

[0021] (4) The device can effectively solve the structural safety problem caused by the uncertainty of load direction by controlling the multi-directional vibration of the structure.

[0022] (5) The device also has the characteristics of simple structure, convenient processing, easy installation and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a stereoscopic diagram of an inertial capacity tuned energy absorption and vibration reduction device;

[0024] Figure 2 It is the front view of the inertial capacity tuned energy absorption and vibration reduction device;

[0025] Figure 3 It is a side view of an inertial capacity tuned energy absorption and vibration reduction device;

[0026] Figure 4 It is an attached view of an inertial capacity tuned energy absorption and vibration reduction device;

[0027] Figure 5 is the cross-sectional view of the mass block;

[0028] Figure 6 It is a schematic diagram of the connection between the annular groove, pulley turntable and ball screw;

[0029] Figure 7 is a cross-sectional view of the connection between the ball screw and the first bevel gear;

[0030] In the figure: 1, top plate; 2, annular groove; 3, guide rod; 4, connecting rod; 5, pulley turntable; 6, ball screw; 7, first umbrella-shaped gear; 8, second umbrella-shaped gear; 9, mass block; 10, first spring; 11, energy dissipation damper; 12, second spring; 13, box; 14, omnidirectional wheel; 15, outer bearing; 16, central shaft; 17, rotating disc; 18, frame column; 19 transfer rod; 20, fixed plate; 21, bearing. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0032] The inertial capacitance multi-directional tuning energy absorption and vibration reduction device provided in this embodiment has a structure as follows: Figure 1-4 As shown, it mainly includes: a frame and an inertia container device and a mass tuning device installed in the frame.

[0033] The frame is composed of a top plate 1 and four frame columns 18 supporting the top plate 1 , and the top plate 1 is fixedly connected to the frame columns 18 .

[0034] The mass tuning device comprises a mass block 9, an energy dissipation damper 11, a second spring 12, and an omnidirectional wheel 14. The mass block 9 is composed of a box body 13, an outer bearing 15 outside the box body, and a central rotating shaft 16 inside the box body.

[0035] The box 13 is made of metal plate or reinforced fiber material, and is cylindrical in shape. Two symmetrical openings are provided on the side for installing the rotating disc. A mounting hole is provided in the center of the top for fixing the bearing. A plurality of omnidirectional wheels 14 are provided at the bottom of the box 13, which can make the mass block move in any direction in the plane.

[0036] like Figure 5 As shown, a plurality of rotating discs 17 are arranged inside the box 13 of the mass block 9. Small platforms for supporting the rotating discs 17 are welded at intervals on the central rotating shaft 16. The rotating disc 17 is composed of two semi-circular discs, each of which is provided with a mounting hole and is bolted and fixed to the small platform. The shape, size and quantity of the rotating discs 17 can be adjusted according to the frequency response characteristics and control objectives of the controlled structure to achieve the purpose of controlling the mass size and moment of inertia, thereby improving the versatility of the device.

[0037] A deep groove ball steel bearing with appropriate parameters is provided at the upper end of the central rotating shaft 16 to ensure that the inner diameter of the bearing, the outer diameter of the central rotating shaft 16 and the outer diameter of the second bevel gear 8 are all the same. The deep groove ball steel bearing is fixed at the top center of the housing 13, the inner diameter of the bearing is the same as the outer diameter of the second bevel gear 8, the inner wall of the bearing is welded to the bevel gear 8, and the outer wall of the bearing is connected to the housing 13 by welding.

[0038] like Figure 1 and 6 As shown in the figure, the inertia device is composed of an annular groove 2, a pulley turntable 5, a ball screw 6, a rotating disc 17, etc. The annular groove 2 is fixed on the lower surface of the top plate 1. A guide rod 3 with a slider is embedded in the annular groove 2, and the slider is connected to the lower connecting rod 4. The guide rod 3 can rotate along the annular groove 2, and the slider can move forward and backward along the guide rod 3 with the movement of the lower component, so that the slider can move in a plane. The connecting rod 4 is connected to the pulley turntable 5 through a ball pulley, so that the pulley turntable 5 can rotate around the connecting rod 4.

[0039] The screw nut on the ball screw 6 is sleeved with the first umbrella-shaped gear 7. Behind the first umbrella-shaped gear 7, a fixing plate 20 is provided. The center of the fixing plate 20 is penetrated with a hole. The lower end of the fixing plate 20 is fixed to the top of the housing 13 by welding or bolting. A bearing 21 is provided at the tail of the first umbrella-shaped gear 7. The bearing 21 is embedded in the hole in the center of the fixing plate 20. The inner ring of the bearing 21 is fixedly connected to the tail of the first umbrella-shaped gear 7. The outer ring of the bearing is fixedly connected to the fixing plate 20. The ball screw 6 passes through the inner ring of the bearing 21, and its two ends are fixed to the inner side of the pulley turntable 5. When the screw nut rotates on the ball screw 6, the first umbrella-shaped gear 7 is driven to rotate. Since the tail of the first umbrella-shaped gear 7 is connected to the fixing plate 20 through the bearing 21, the relative position of the first umbrella-shaped gear 7, the fixing plate 20 and the housing 13 remains unchanged.

[0040] The first bevel gear 7 is meshed with the second bevel gear 8. Since the second bevel gear 8 is fixed at the top center of the housing 13, it can be ensured that the first bevel gear 7 and the second bevel gear 8 are always meshed. The first bevel gear 7 can rotate in the same direction on the ball screw 6. When the first bevel gear 7 rotates along the ball screw 6, it drives the second bevel gear 8 to rotate. The rotation of the second bevel gear 8 drives the central shaft 16 and the rotating disk 17 to rotate.

[0041] Closed small hooks are welded at the connection points of the first spring 10, the energy dissipation damper 11 and the second spring 12. Four groups of second springs 12 are connected between the frame column 18 and the large bearing 15 sleeved outside the box 13. One end of the four groups of first springs 10 is connected to the frame column 18, and the other end is connected in parallel to the energy dissipation damper 11 and the connecting rod 4 through the transfer rod 19. The transfer rod 19 is a vertical rod, the lower end of one side of which is connected to the energy dissipation damper 11, the upper end of which is connected to the connecting rod 4 through a connecting rod, and the other side is connected to the first spring 10. The connecting rod 4 is first connected in parallel with the energy dissipation damper 11, and then connected in series with the first spring 10, and the first spring 10 plays a role in increasing the degree of freedom.

[0042] One end of the energy dissipation damper 11 is connected to the transfer rod 19, and the other end is connected to the outer bearing 15. The angle between each two adjacent groups of first springs is 90 degrees, and the angle between two adjacent groups of energy dissipation dampers is also 90 degrees. If subjected to external excitation, the mass block 9 moves in any direction in the horizontal plane, causing the second spring 12 and the first spring 10 to undergo elastic deformation, and store energy together with the rotating disk 17, which is then absorbed and dissipated by the energy dissipation damper 11.

[0043] The working principle of the inertial capacity multi-directional tuning energy absorption and vibration reduction device provided in this embodiment is described in detail as follows:

[0044] When subjected to external excitation, the mass block 9 moves in a plane through the omnidirectional wheel 14 at the bottom of the box 13. Since the lower end of the fixed plate 20 is fixedly connected to the top of the box 13, when the box 13 moves in a plane, the fixed plate 20 also moves with the box 13. The movement of the fixed plate 20 drives the ball screw 6 passing through it to move in a plane. Since the first umbrella gear 7 is connected to the nut of the ball screw 6, the first umbrella gear 7 rotates when the screw nut translates along the screw. The rear end of the first umbrella gear 7 is fixedly connected to the fixed plate 20. Therefore, the relative position of the first umbrella gear 7, the fixed plate 20 and the box 13 remains unchanged. The first umbrella gear 7 drives the second umbrella gear 8 to rotate through gear meshing, and the second umbrella gear 8 drives the central shaft 16 and the rotating disk 17 to rotate. In addition, since the ball screw 6 is fixed to the pulley turntable 5, the movement of the ball screw 6 in a plane drives the pulley turntable 5 to move. The upper end of the pulley turntable 5 is connected to the lower end of the connecting rod 4 through a ball pulley, and the pulley turntable 5 is consistent with the connecting rod 4 when it moves in translation, and the pulley turntable 5 can rotate around the connecting rod 4. When the connecting rod 4 moves in translation, the connecting rod 4 will move axially along the guide rod 3 through the slider, and the guide rod 3 can rotate in the annular groove 2, so that the connecting rod 4 can appear at any position in the plane of the annular groove.

[0045] Since the connecting rod 4 is connected to the transfer rod 19, the movement of the connecting rod 4 drives the transfer rod 19 to move. The movement of the transfer rod 19 causes the first spring 10 to deform. The deformation energy storage of the first spring 10 is transmitted to the energy dissipation damper 11, which then absorbs and dissipates the energy, thereby realizing inertia vibration reduction.

[0046] At the same time, when the box body 13 moves in the plane, the second spring 12 is deformed, and stores energy together with the rotating disk 17 , which is then absorbed and dissipated by the energy dissipation damper 11 .

[0047] The inertia-capacitance multi-directional tuning energy absorption and vibration reduction device provided in this embodiment has a frequency of the tuned mass structure controlled by the apparent mass of the mass block 9 and the stiffness of the second spring 12. The mass of the mass block can be designed according to the frequency response characteristics of the controlled structure and the optimization target. The inertia coefficient of the inertia element is related to the shape, size and number of the rotating disks 17 therein. The rotational inertia can be changed by adjusting the shape, size and number of the rotating disks 17 to achieve the required inertia effect. The mass block 9 is simultaneously a component of the mass tuning device and the inertia device, and the tuning mass device and the inertia device are organically coupled together. When the rotating disk 17 rotates, the corresponding inertia force can be used to store the kinetic energy of the external structure and transfer it to the damping unit, thereby improving the energy consumption efficiency of the structure and reducing the vibration of the main structure. The present invention achieves the inertia effect, improves the mass tuning method of the vibration reduction device, and improves the energy absorption and energy consumption efficiency of the vibration reduction device by changing the mass block structure.

Claims

1. An inertia-capacitance multi-directional tuning type energy absorption and vibration reduction device, comprising an inertia-capacitance device and a mass tuning device installed in a main frame; characterized in that: The mass tuning device is connected to the inertia capacity device; the inertia capacity device and the mass tuning device are connected to the main frame through an elastic element; the mass tuning device includes a box body, and an external bearing is provided on the outside of the box body; the external bearing is connected to the main frame through a second spring; the inertia capacity device includes a rotating disk; the rotating disk is fixed in the box body through a central rotating shaft; the inertia capacity device includes a pulley turntable and a ball screw; the two ends of the ball screw are fixed on the inner side of the pulley turntable; the nut of the ball screw is connected to the central rotating shaft through a transmission device; the upper part of the pulley turntable is connected to the sliding device through a connecting rod, and moves in a plane under the guidance of the sliding device; the transmission device includes A first bevel gear and a second bevel gear; the first bevel gear is sleeved on the nut of the ball screw; a fixing plate is provided at the tail of the first bevel gear, and the lower end of the fixing plate is fixed to the top of the housing; the first bevel gear is connected to the fixing plate through a first bearing, and the ball screw passes through the inside of the first bearing; the second bevel gear is connected to the central shaft through a second bearing; the second bearing is fixed to the top of the housing; the first bevel gear and the second bevel gear are meshed; the two ends of the sliding device are embedded in the annular groove, and perform circular motion under the guiding action of the annular groove; the pulley turntable is connected to the connecting rod through a ball pulley, so that it performs circular motion along the connecting rod.

2. The inertial capacity multi-directional tuning energy absorption and vibration reduction device according to claim 1 is characterized in that: The mass tuning device also includes a plurality of damping and energy dissipation devices; the energy dissipation and damping devices are arranged at equal intervals, one end of which is fixed on the outer bearing, and the other end is connected to the inertia device through a transfer rod.

3. The inertial capacity multi-directional tuning energy absorption and vibration reduction device according to claim 2 is characterized in that: A first spring is arranged between the transfer rod and the frame column.

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