A rotation-amplified particle inertia damper

Abstract

The present invention relates to a rotationally amplified particle inertia damper, comprising an outer ring, gears of three sizes (large, medium, and small), an additional mass, a mass block, a spring, particles, a support, a threaded rotating rod, a base, a pin, and a steel sheet. The threaded rotating rod, base, and pin constitute a support structure that is fixedly connected to the main structure to be damped. The threaded connecting rod engages with the threads within the large gear, and through the interaction of the three gears, the horizontal movement of the main structure is converted into rotation of the ring and the gear. Compared to the prior art, when the deformation displacement between structural layers is small, the rotationally amplified particle inertia damper of the present invention can amplify the rotational displacement of the energy-consuming component through a simple structural design, providing a larger inertial mass and thus producing a good damping effect. At the same time, the parameters of the damper can be adjusted by adjusting the additional mass to facilitate adaptation to different types of structures to be damped.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering structure vibration control, in particular to a rotationally amplified particle inertia damper. Background Art

[0002] With the continuous development of the economy, society, and science and technology, a large number of high-rise buildings have emerged in the civil engineering field, especially in recent years. However, these buildings have some unfavorable structural factors that cannot be ignored. The taller the building, the more severe the structural response to lateral wind loads or earthquakes. my country is vast and prone to extreme disasters such as earthquakes and typhoons. Therefore, structural vibration control is extremely important in the field of civil engineering.

[0003] Traditional structural vibration control methods include base isolation and energy dissipation. Within this area, passive, semi-active, and active control technologies have emerged. Passive control technologies, such as tuned mass dampers, particle dampers, and eddy current dampers, have been widely used due to their simple principles and ease of construction. However, these dampers are effective when the vibration displacement is small.

[0004] When the relative displacement between layers of the main structure is small, the vibration reduction capacity of the damper is limited. Considering that the main body of the building structure generally does not allow large inter-layer displacement deformation, in order to give full play to the energy dissipation effect of the damper, an amplification device is often required to amplify the inter-layer deformation of the building structure, thereby improving the overall energy dissipation capacity of the structure.

[0005] Therefore, in order to address the problem of limited energy dissipation and vibration reduction effect of the damper under small displacement, a rotation-amplified particle inertia damper is urgently needed to achieve a more obvious vibration reduction effect under small displacement. Summary of the Invention

[0006] The purpose of the present invention is to provide a rotation-amplifying particle inertia damper in order to overcome the defects of the above-mentioned prior art. When the inter-layer displacement and speed of the structure are small, the rotation of the coaxial large gear is amplified by the threaded rotating rod, and the mutual engagement between the gear sets achieves further amplification of the rotation speed. At the same time, the additional mass and particle filling increase the physical mass of the structure, increase the damping of the structure, and give full play to the energy dissipation and shock absorption capabilities of the damper, thereby improving the overall energy dissipation capacity of the structure.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The purpose of the present invention is to provide a rotation-amplified particle inertia damper, comprising an outer ring, a large gear, a small gear, a medium gear, particles, a support, a threaded rotating rod, a base, a steel sheet, and a negative stiffness element; the outer ring has four support rods, which are respectively fixed to the small gear and the medium gear; the inner part of the outer ring is hollow, and a certain number of steel sheets are built in to divide the inner part into smaller spaces, and the inner part is filled with particles of different sizes; the outer ring is connected to the main structure through a support, and the outer ring and the main structure can rotate freely; the base is fixed to the main structure , the two do not produce relative displacement; the base is hinged to the threaded rotating rod; the threaded rotating rod engages with the thread inside the large gear to achieve the transformation from translation to rotation; the large gear and the outer ring can rotate freely; the small gear and the medium gear are both fixed to the outer ring; the large gear engages with the small gear and the medium gear, and the rotation of the large gear drives the small gear and the medium gear fixed to the outer ring to rotate; the negative stiffness element is connected to the outer ring to make the structural system have better shock absorption performance; the entire damper realizes the change from translation to rotation.

[0009] Furthermore, the rotation-amplifying particle inertia damper further includes an additional mass; the additional mass is fixedly connected to the outside of the large gear, the small gear, and the medium gear.

[0010] Furthermore, the outer ring, large gear, small gear, and medium gear can be regarded as inertial bodies during rotation. Filling the inner part of the outer ring with particles and fixing additional mass on the outer side of the large gear, small gear, and medium gear can increase the mass of the inertial body, thereby providing a greater inertia amplification effect.

[0011] Furthermore, the negative stiffness element includes a mass block and a spring; the outer ring is connected to the spring; the mass block is connected to the spring; during the rotation process, the mass block produces displacement, which will drive the two collinear springs to move. In this process, the mass block and the spring constitute a negative stiffness element. The introduction of negative stiffness enables the structural system to have better shock absorption performance.

[0012] Furthermore, a set of negative stiffness elements includes a mass block and three springs.

[0013] Furthermore, one end of each of the three springs in each group of negative stiffness elements is connected to the mass block; the other ends of two of the springs are respectively connected to the two struts on the outer ring; and the other end of the other spring is connected to the outer ring.

[0014] Furthermore, four groups of negative stiffness elements are provided.

[0015] Furthermore, the large gear, the small gear and the medium gear form a gear set; the large gear rotates coaxially with the threaded rod, and the angular velocity ω of the two is the same, while the linear velocity (where R is the radius of the gear). According to the corresponding physical relationship, the linear velocity of the large gear is amplified compared to the threaded rod. In the movement of the gear set, the law followed is that the edge linear velocity v of the gears that mesh with each other at the same time is the same, while the angular velocity The radius of the small gear and the medium gear is smaller than that of the large gear. According to the corresponding physical relationship, the angular velocity of the small gear and the medium gear is amplified by the centripetal acceleration. , the centripetal acceleration is amplified to a greater extent; through two-step transmission, the rotation is amplified and the energy consumption is improved.

[0016] Furthermore, when subjected to external excitation, the support drives the outer ring and a series of attached masses to move horizontally, and the threaded rotating rod and its base to move horizontally. There will be a relative displacement between the horizontal movements of the two parts, driving all the components on the outer ring to rotate at the same time. The whole is an inertia-capacitance damper.

[0017] Furthermore, the rotation-amplifying particle inertia damper also includes a pin; the base and the threaded rotating rod are connected by the pin. If the main structure produces relative displacement between layers under the action of wind or earthquake, the base will drive the threaded rotating rod to move horizontally under the connection of the pin, and the threaded rotating rod will engage with the thread inside the large gear to realize the conversion from translation to rotation.

[0018] Furthermore, the diameters of the particles are different, and the diameter range of the particles may be 5 mm to 50 mm.

[0019] Furthermore, the particles are any one or more of steel balls, concrete balls, glass balls or ceramic balls.

[0020] Furthermore, the outer ring is divided into smaller sections by steel sheets and filled with particles inside. During the rotation process, the particles in each divided section collide with each other, and the particles collide with the steel sheets, resulting in the loss of part of the energy input into the structure by the earthquake.

[0021] The above-mentioned rotation-amplified particle inertia damper is used in the field of vibration control of civil structures (including high-rise buildings, tall structures and bridge structures, etc.).

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The present invention realizes a high-speed rotating inertia damper, in which the large gear and the threaded rotating rod rotate coaxially, and the angular velocity of the two are the same. The linear velocity of the large gear with the largest radius is greater than that of the threaded rod. A small rotation causes a large rotation of the large gear, and the rotation is amplified for the first time. At the same time, the linear velocity of the gear edges between the meshing gear groups is the same. According to the angular velocity The angular velocity of the small gear and the medium gear with smaller radius is greater than that of the large gear, and the corresponding centripetal acceleration is The degree of amplification is greater, the rotational angular velocity of the two relatively small gears is amplified, and the rotation is amplified in a second step. The gradual amplification of the rotation is achieved by using the two steps of coaxial rotation and gear meshing rotation, thereby improving the energy consumption capacity.

[0024] 2) In the present invention, the rotating outer ring and the series of masses fixedly attached to it can be regarded as inertial bodies. The filling particles inside the outer ring and the arrangement of the gears on the support rods increase the physical mass of the rotating body. As the mass of the moving object increases, the inertial force generated will also be greater, thereby providing a greater inertia amplification effect. The physical mass of the entire rotating component can be changed by adjusting the additional mass fixedly attached to the gears to achieve different damping parameters of the damper.

[0025] 3) The combination of the spring and mass in the present invention produces negative stiffness. During movement, the angle between the two collinear springs gradually decreases. Utilizing the parallelogram law of force, as the angle gradually decreases, the force required to produce displacement becomes smaller and smaller, thus forming a negative stiffness component. The introduction of negative stiffness gives the system better shock absorption performance.

[0026] 4) The present invention incorporates particles, which, while utilizing the energy dissipation advantage of the inertial damper, also utilizes the advantage of the particle damper in dissipating external input energy during the mutual collision of particles and the mutual collision of particles and steel sheets, thereby increasing the dissipation of structural energy. At the same time, to avoid loud noise during the particle collision process, a certain amount of sound-absorbing material can be attached to the particle container to improve human comfort during the shock absorption process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view of a rotationally enlarged particle inertia damper in an embodiment of the present invention.

[0028] Figure 2 It is a side view of a rotationally enlarged particle inertia damper in an embodiment of the present invention.

[0029] Figure 3 Schematic diagram of the outer ring of a rotationally enlarged particle inertia damper in an embodiment of the present invention.

[0030] Figure 4 Schematic diagram of a group of negative stiffness elements of a rotationally amplified particle inertia damper in an embodiment of the present invention.

[0031] Figure 5 Schematic diagram of support for a rotationally enlarged particle inertia damper in an embodiment of the present invention.

[0032] The numbers in the figure show:

[0033] 1 is the outer ring, 2 is the large gear, 3 is the small gear, 4 is the medium gear, 5 is the additional mass, 6 is the mass block, 7 is the spring, 8 is the particles, 9 is the support, 10 is the threaded rod, 11 is the base, 12 is the pin shaft, and 13 is the steel sheet. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0035] The present invention provides a rotationally amplified particle inertia damper, comprising an outer ring, gears of three sizes (large, medium, and small), an additional mass, a mass block, a spring, particles, a support, a threaded rotating rod, a base, a pin, and a steel sheet. The threaded rotating rod, base, and pin constitute a support structure that is fixedly connected to the main structure to be damped. The threaded connecting rod engages with the threads within the large gear, and through the interaction of the three gears, the horizontal movement of the main structure is converted into rotation of the ring and the gear. When the deformation displacement between structural layers is small, the rotationally amplified particle inertia damper of the present invention can amplify the rotational displacement of the energy-consuming component through a simple structural design, providing a larger inertial mass and thus producing a good damping effect. At the same time, the parameters of the damper can be adjusted by adjusting the additional mass to facilitate adaptation to different types of structures to be damped. Example

[0036] The invention discloses a rotation-amplifying particle inertia damper, comprising an outer ring 1, a large gear 2, a small gear 3, a medium gear 4, particles 8, a support 9, a threaded rotating rod 10, a base 11, a pin 12, a steel sheet 13, and a negative stiffness element.

[0037] The outer ring 1 has four support rods, which are respectively fixed to the small gear 3 and the medium gear 4. The interior is hollow, and 12 steel plates 13 are built in to divide the outer ring 1 into small spaces, and the interior is filled with particles 8 with a diameter of 5-50mm; the outer ring 1 is connected to the main structure through supports 9, and supports 9 are herringbone supports, which are fixed to the main structure, but supports 9 can rotate relative to the outer ring 1; the base 11 is made of steel and is fixed to the main structure. The two do not produce relative displacement. The main structure produces relative displacement between layers under the action of wind\earthquake, and the supports drive part of the outer ring 1 to move horizontally. The base 11 is pinned The connection of the shaft 12 drives the threaded rotating rod 10 to move horizontally, and there will be a relative displacement between the two, which causes acceleration at both ends of the damper and introduces inertia; the threaded rotating rod 10 engages with the thread inside the large gear 2, realizing the transformation from translation to rotation; the large gear 2 and the outer ring 1 can rotate freely, and the rotation of the large gear 2 drives the small gear 3 and the medium gear 4 fixed to the outer ring 1 to rotate; the mutual engagement of the gear sets realizes the amplification of the rotation, and the entire damping device realizes the change from translation to rotation; additional mass 5; the additional mass 5 is fixed to the outside of the large gear 2, the small gear 3, and the medium gear 4.

[0038] The outer ring 1, large gear 2, small gear 3, and medium gear 4 can be regarded as inertial bodies during rotation. Filling the inner part of the outer ring 1 with particles 8 and fixing additional masses 5 on the outer sides of the large gear 2, small gear 3, and medium gear 4 can increase the mass of the inertial body, thereby providing a greater inertia amplification effect.

[0039] The negative stiffness element includes a mass block 6 and a spring 7; the outer ring 1 is connected to the spring 7; the mass block 6 is connected to the spring 7; during the rotation process, the mass block 6 produces displacement, which will drive the two collinear springs 7 to move. In this process, the mass block 6 and the spring 7 constitute a negative stiffness element. The introduction of negative stiffness enables the structural system to have better shock absorption performance.

[0040] A group of negative stiffness elements includes a mass block 6 and three springs 7; one end of the three springs 7 in each group of negative stiffness elements is connected to the mass block 6; the other ends of two of the springs 7 are respectively connected to the two support rods on the outer ring 1; the other end of the other spring 7 is connected to the outer ring 1; 4 groups of negative stiffness elements are set.

[0041] The large gear 2, the small gear 3 and the medium gear 4 form a gear set; the large gear 2 rotates coaxially with the threaded rod 10, and the angular velocity ω of the two is the same, while the linear velocity (where R is the radius of the gear). According to the corresponding physical relationship, the linear velocity of the large gear 2 is amplified compared to the threaded rod 10. In the movement of the gear set, the law followed is that the edge linear velocity v of the gears that mesh with each other at the same time is the same, while the angular velocity The radius of the small gear 3 and the medium gear 4 is smaller than that of the large gear 2. According to the corresponding physical relationship, the angular velocity of the small gear 3 and the medium gear 4 is amplified by the centripetal acceleration. , the centripetal acceleration is amplified to a greater extent; through two-step transmission, the rotation is amplified and the energy consumption is improved.

[0042] When stimulated by external factors, the support 9 drives the outer ring 1 and a series of attached masses to move horizontally, and the threaded rotating rod 10 and its base 11 to move horizontally. There will be a relative displacement between the horizontal movements of the two parts, driving all the components on the outer ring 1 to rotate at the same time. The whole is an inertia-capacitance damper.

[0043] The diameters of the particles 8 vary, and the diameter of the particles 8 may range from 5 mm to 50 mm.

[0044] The particles 8 are any one or more of steel balls, concrete balls, glass balls or ceramic balls.

[0045] The outer ring 1 is divided into smaller sections by steel sheets 13 and filled with particles 8. During the rotation, the particles 8 in each section collide with each other and with the steel sheets 13, resulting in a loss of some of the energy input into the structure by the earthquake.

[0046] The aforementioned rotationally amplified particle inertia damper is used in the field of vibration control for civil structures, including high-rise buildings, towering structures, and bridges. The inertia damper exhibits excellent damping efficiency. It utilizes additional mass to increase the physical mass of the rotating component, achieving inertia amplification. The introduction of negative stiffness enhances the system's shock absorption performance. The particles filling the spaces between the outer rings can collide with each other during rotation. This combination of features significantly increases the structure's energy dissipation under external excitation, ultimately resulting in the rotationally amplified particle inertia damper described in this invention.

[0047] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A rotationally amplified particle inertia damper, characterized in that: It includes an outer ring (1), a large gear (2), a small gear (3), a medium gear (4), particles (8), a support (9), a threaded rotating rod (10), a base (11), a steel sheet (13), and a negative stiffness element; The outer ring (1) has four support rods, which are respectively fixed to the small gear (3) and the medium gear (4); A certain number of steel sheets (13) are provided in the inner hollow area of ​​the outer ring (1) to separate the interior of the outer ring (1), and particles (8) are filled in the interior of the outer ring (1); The outer ring (1) is connected to the main structure via a support (9), and the outer ring (1) and the main structure are freely rotatable; The base (11) is fixedly connected to the main structure; The base (11) is hinged to the threaded rotating rod (10); The threaded rotating rod (10) engages with the thread inside the large gear (2); The large gear (2) and the outer ring (1) can rotate freely; The small gear (3) and the medium gear (4) are both fixedly connected to the outer ring (1); The large gear (2) is meshed with the small gear (3) and the medium gear (4); The negative stiffness element is connected to the outer ring (1); The negative stiffness element includes a mass block (6) and a spring (7); The outer ring (1) is connected to the spring (7); The mass block (6) is connected to the spring (7); A set of negative stiffness elements includes a mass block (6) and three springs (7); One end of each of the three springs (7) in each group of negative stiffness elements is connected to the mass block (6); The other ends of the two springs (7) are respectively connected to the two support rods on the outer ring (1); The other end of the other spring (7) is connected to the outer ring (1); The two steps of coaxial rotation and gear meshing rotation are used to achieve gradual amplification of rotation and improve energy consumption capacity; The rotation-amplified particle inertia damper also includes a pin (12); the base (11) is connected to the threaded rotating rod (10) through the pin (12); if the main structure generates inter-layer relative displacement under the action of wind or earthquake, the base (11) will drive the threaded rotating rod (10) to move horizontally under the connection of the pin (12), and the threaded rotating rod (10) will engage with the thread inside the large gear (2) to achieve the conversion from translation to rotation.

2. The rotation-amplified particle inertia damper according to claim 1, characterized in that: The rotation-amplified particle inertia damper further includes an additional mass (5); The additional mass (5) is fixedly connected to the outside of the large gear (2), the small gear (3), and the medium gear (4).

3. The rotation-amplified particle inertia damper according to claim 1, characterized in that: The negative stiffness elements are provided in four groups.

4. The rotation-amplified particle inertia damper according to claim 1, characterized in that: The large gear (2), the small gear (3) and the medium gear (4) constitute a gear set; The large gear (2) rotates coaxially with the threaded rotating rod (10); the radius of the small gear (3) and the medium gear (4) is smaller than that of the large gear (2).

5. The rotation-amplified particle inertia damper according to claim 1, characterized in that: The interior of the outer ring (1) is filled with particles (8) of different sizes; The diameters of the particles (8) vary, and the diameter range of the particles (8) is 5 mm to 50 mm.

6. The rotation-amplified particle inertia damper according to claim 5, characterized in that: The particles (8) are any one or more of steel balls, concrete balls, glass balls or ceramic balls.

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