A vertically tuned shock / vibration damping device with quasi-zero stiffness characteristics

Abstract

The invention discloses a vertical tuning damping / vibration device with quasi-zero stiffness characteristics, comprising an outer sleeve, a vertical quasi-zero stiffness spring group, a tuning mass component, a viscous damper and a loading limit rod; the loading limit rod is carried on the vertical quasi-zero stiffness spring group, and the vertical quasi-zero stiffness spring group provides a nonlinear elastic restoring force for the loading limit rod; the two ends of the viscous damper are respectively connected to the main controlled structure and the loading limit rod, and the vibration energy is absorbed by the relative deformation of the two, thereby reducing the vibration amplitude of the main controlled structure; the tuning mass component is connected to the bottom end of the loading limit rod and supports the vertical quasi-zero stiffness spring group; the outer sleeve is located at the outer layer of the loading limit rod and the vertical quasi-zero stiffness spring group, and a connecting portion connected to the main controlled structure is arranged on the outer sleeve. The invention utilizes the nonlinear stiffness characteristics of the vertical quasi-zero stiffness spring group to improve the control bandwidth range of the device, and realize the earthquake and vibration dual control effects of the structural floor and the vertical flexible structure.

Description

Technical Field

[0001] The invention relates to the technical field of earthquake disaster protection and vibration control, and in particular to a vertical tuning damping / vibration device with quasi-zero stiffness characteristics. Background Art

[0002] Earthquakes are a multi-dimensional force, and their vertical vibration component has a great impact on the floor of a building structure. Since the natural vibration period of the floor is much smaller than that of the vertical components of the structure, such as walls and columns, it has an amplifying effect on the vertical seismic motion. Although the amplification of the seismic effect of the floor will not have a decisive impact on the earthquake damage to the structure, studies have shown that vertical vibration is the main factor causing damage to non-structural components, such as floor decoration ceilings, ventilation ducts, and indoor electrical appliances and furniture. With the rapid development of urban rail transit, more and more residences are built on subway stations or subway lines. The problem of discomfort caused by rail transit vibration is becoming more and more prominent. In addition, the problem of vertical vibration caused by pedestrians in vertical flexible structures such as pedestrian overpasses and large-span floor slabs is also particularly prominent.

[0003] Based on the above, the design proposes a shock-absorbing / vibration device for earthquake and vibration dual control of building structure floors and vertical flexible structures, which can effectively solve practical problems in engineering.

[0004] Tuned vibration reduction is a passive vibration control technology. The tuned vibration reduction device usually consists of three parts: mass block, spring and damping system. It achieves the effect of vibration reduction by designing the natural frequency of the vibration reduction device to be close to the main frequency of the controlled structure, changing the resonant dynamic characteristics of the structure. The concept of tuned mass vibration reduction has been proposed for more than 100 years and has been widely used in engineering. In the field of civil engineering, tuned mass dampers (TMDs) are usually used in wind vibration control of super high-rise buildings, such as Shanghai Tower and Taipei 101. However, tuned mass dampers have the disadvantages of narrow effective frequency bandwidth and unstable control effect, which makes them limited in controlling vibration effects with a wide range of excitation frequencies such as earthquakes. Therefore, there are few studies on the application of TMD to earthquake control. Summary of the invention

[0005] The present invention provides a vertical tuning damping / vibration device with quasi-zero stiffness characteristics to solve the problem of damage to non-structural components caused by vertical earthquake motion and the problem of environmental vibration control of vertical flexible structures. The present invention can achieve a better shock / vibration control effect for vertical earthquake motion and other vertical vibration inputs than traditional tuning damping devices based on linear stiffness.

[0006] The technical solution adopted by the present invention is: to provide a vertical tuning damping / vibration device with quasi-zero stiffness characteristics, comprising an outer sleeve, a vertical quasi-zero stiffness spring group, a tuning mass component, a viscous damper and a loading limit rod;

[0007] The loading limit rod is supported on a vertical quasi-zero stiffness spring group, and the vertical quasi-zero stiffness spring group provides a nonlinear elastic restoring force for the loading limit rod;

[0008] The two ends of the viscous damper are respectively connected to the main controlled structure and the loading limit rod, and the vibration energy is absorbed by the relative deformation between the two, thereby absorbing the vibration energy of the main controlled structure;

[0009] The tuned mass component is connected to the bottom end of the loading limit rod and supports the vertical quasi-zero stiffness spring group; under the action of external vibration, the deformation of the vertical quasi-zero stiffness spring group generates up and down reciprocating motion, driving the viscous damper to generate relative deformation energy consumption;

[0010] The outer sleeve is located at the outer layer of the loading limit rod and the vertical quasi-zero stiffness spring group, and a connecting portion connected to the main controlled structure is arranged on the outer sleeve.

[0011] The present invention adopts a vertical quasi-zero stiffness spring group as the TMD spring. Due to its vertical quasi-zero stiffness characteristics, it provides a nonlinear restoring force in the vertical direction. When statically bearing the gravity of the mass block, the spring group provides a larger "static stiffness", which is manifested as a smaller gravity deformation of the spring; and when subjected to external excitation and reciprocating vibration, it provides a smaller "dynamic stiffness", which is manifested as a wider tuning frequency range for the shock / vibration device, and can have a shock-absorbing effect on ground motion excitation with a wider spectrum range.

[0012] The present invention adopts a viscous damper as an energy dissipation device to dissipate vibration energy through the relative deformation between a vertical quasi-zero stiffness spring group and a main controlled structure.

[0013] Preferably, it also includes a polytetrafluoroethylene ring, and a polytetrafluoroethylene ring groove is provided on the inner wall of the outer sleeve to fix the polytetrafluoroethylene ring; the polytetrafluoroethylene ring is sleeved on the loading limit rod to guide the loading limit rod.

[0014] The present invention designs devices and structures such as a polytetrafluoroethylene ring groove and a polytetrafluoroethylene ring. The polytetrafluoroethylene ring is designed between an outer sleeve and a loading limit rod. The inner diameter of the polytetrafluoroethylene ring is equal to the outer diameter of the upper end of the loading limit rod, which plays a role in limiting the tuning mass component and the vertical quasi-zero stiffness spring group from horizontal deformation and only in vertical movement.

[0015] Preferably, the outer sleeve adopts a split design, and two or more outer sleeves are assembled together to facilitate installation; the connecting part is a hexagonal bolt hole arranged on the top of the outer sleeve, and the vertical tuning shock / vibration device of the present invention is hung under the main controlled structure by bolts.

[0016] Preferably, the tuning mass component includes a large mass weight and a small mass weight, and the large mass weight and the small mass weight can be combined into a complete weight, and a weight plate for holding the large mass weight and the small mass weight is provided at the lower end of the loading limit rod, and a weight hanging groove is provided at the bottom of the large mass weight and the small mass weight for fixing to the weight plate at the lower end of the limit rod. By dividing the mass weight into two pieces and designing the reserved hole for the weight, installation and device leveling are convenient.

[0017] Preferably, the vertical quasi-zero stiffness spring group comprises a coil spring, a disc spring, an outer loading ring and an inner loading ring;

[0018] The disc springs are connected in series and in parallel by alternately stacking outer loading rings and inner loading rings to form a series and parallel disc spring group;

[0019] The upper end of the coil spring acts on the inside of the loading ring of the loading rod set at the upper end of the loading limit rod, and the lower end acts on the lower end of the outer sleeve, and is connected in parallel with the series and parallel disc spring groups to form a vertical quasi-zero stiffness spring group.

[0020] Preferably, an outer sleeve loading ring is provided at the lower end of the outer sleeve for carrying a vertical quasi-zero stiffness spring group.

[0021] The beneficial effects of the present invention are:

[0022] (1) The nonlinear stiffness characteristics of the quasi-zero stiffness spring group are utilized to improve the control bandwidth range of the tuned shock / vibration damping device, thereby achieving the dual control effects of earthquake and vibration of the structural floor and vertical flexible structure.

[0023] (2) By setting the inner and outer loading rings, the dynamic friction stiffness of the disc spring series and parallel group is reduced, and the deformation range of the disc spring is increased, which is conducive to improving the energy dissipation capacity of the viscous damper.

[0024] (3) A motion decoupling structure was designed using a polytetrafluoroethylene ring, which relatively easily achieved the horizontal limit requirements of the quasi-zero stiffness spring group and the tuned mass component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structure of the vertical tuning damping / vibration device with quasi-zero stiffness characteristics disclosed in the present invention is schematically shown;

[0026] Figure 2a It is a structural schematic diagram of the outer sleeve disclosed in the present invention;

[0027] Figure 2b A cross-sectional view of the outer sleeve disclosed in the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the polytetrafluoroethylene ring disclosed in the present invention;

[0029] Figure 4 It is a structural schematic diagram of the viscous damper disclosed in the present invention;

[0030] Figure 5a The structural intention of the loading limit rod disclosed in the present invention is shown;

[0031] Figure 5b It is a cross-sectional view of the loading limit rod disclosed in the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the spiral spring disclosed in the present invention;

[0033] Figure 7a It is an exploded view of the series and parallel disc spring group disclosed in the present invention;

[0034] Figure 7b It is a structural schematic diagram of the series and parallel disc spring group disclosed in the present invention;

[0035] Figure 7c It is a cross-sectional view of the series and parallel disc spring group disclosed in the present invention;

[0036] Figure 8a It is a schematic diagram of the structure of the large mass weight and the small mass weight disclosed in the present invention;

[0037] Figure 8b Another structural schematic diagram of the large mass weight and the small mass weight disclosed in the present invention;

[0038] Fig. 9 It is an exploded diagram of the vertical tuning shock / vibration absorption device with quasi-zero stiffness characteristics disclosed in the present invention.

[0039] Figure numerals: 1. outer sleeve; 2. outer sleeve loading ring; 3. polytetrafluoroethylene ring slot; 4. hexagon socket bolt hole; 5. polytetrafluoroethylene ring; 6. viscous damper; 7. loading limit rod; 8. loading rod loading ring; 9. weight plate; 10. loading rod reserved hole; 11. coil spring; 12. disc spring; 13. outer loading ring; 14. inner loading ring; 15. large mass weight; 16. reserved hole for weight; 17. small mass weight; 18. weight hanging slot. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0041] Embodiment 1:

[0042] See also Figure 1 , Fig. 9This embodiment discloses a vertical tuning shock / vibration damping device with quasi-zero stiffness characteristics, including an outer sleeve 1, a vertical quasi-zero stiffness spring group, a tuning mass component, a viscous damper 6, a loading limit rod 7 and a polytetrafluoroethylene ring 5.

[0043] The loading limit rod 7 is supported on a vertical quasi-zero stiffness spring group, and the vertical quasi-zero stiffness spring group provides a nonlinear elastic restoring force for the loading limit rod 7 .

[0044] The two ends of the viscous damper 6 are respectively connected to the main controlled structure and the loading limit rod 7, and the vibration energy is absorbed by the relative deformation between the two, thereby absorbing the vibration energy of the main controlled structure.

[0045] The tuned mass component is connected to the bottom end of the loading limit rod 7 and supports the vertical quasi-zero stiffness spring group. Under the action of external vibration, the deformation of the vertical quasi-zero stiffness spring group produces up and down reciprocating motion, driving the viscous damper 6 to produce relative deformation energy consumption.

[0046] The outer sleeve 1 is located on the outer layer of the loading limit rod 7 and the vertical quasi-zero stiffness spring group, and a connecting portion connected to the main controlled structure is provided on the outer sleeve.

[0047] The present invention adopts a vertical quasi-zero stiffness spring group as the TMD spring. Due to its vertical quasi-zero stiffness characteristics, it provides a nonlinear restoring force in the vertical direction. When statically bearing the gravity of the mass block, the spring group provides a larger "static stiffness", which is manifested as a smaller gravity deformation of the spring; and when subjected to external excitation and reciprocating vibration, it provides a smaller "dynamic stiffness", which is manifested as a wider tuning frequency range for the shock / vibration device, and can have a shock-absorbing effect on ground motion excitation with a wider spectrum range.

[0048] The present invention adopts the viscous damper 6 as the energy dissipation device. The viscous damper 6 is a device with mature application technology, which dissipates vibration energy through the relative deformation between the vertical quasi-zero stiffness spring group and the main controlled structure.

[0049] Referring to Fig. 2, the structure and use of the outer sleeve 1 are described. A hexagon socket bolt hole 4 is reserved at the upper end of the outer sleeve 1 as a connection portion connected to the main controlled structure. It is connected to the lower end member of the vibration controlled structure through a hexagon socket bolt, and the vertical tuning shock absorption / vibration device of the present invention is hung below the main controlled structure. For example, the lower flange of a steel beam of a steel structure or a composite structure, or a steel embedded part of a concrete floor. A polytetrafluoroethylene ring groove 3 is reserved to fix the polytetrafluoroethylene ring 5 to play a horizontal limit role. An outer sleeve loading ring 2 is provided at the lower end, which serves the function of bearing a vertical quasi-zero stiffness spring group. Preferably, the outer sleeve 1 adopts a split design, and two or more outer sleeves are assembled together. The outer sleeve 1 is preferably made of steel.

[0050] The present invention designs devices and structures such as the polytetrafluoroethylene ring groove 3 and the polytetrafluoroethylene ring 5, which play a role in limiting the tuning mass component and the vertical quasi-zero stiffness spring group from horizontal deformation and only moving vertically.

[0051] Figure 3 The structure and use of the polytetrafluoroethylene ring 5 are described below. The inner diameter of the polytetrafluoroethylene ring 5 is consistent with the outer diameter of the upper end of the loading limit rod 7, and the polytetrafluoroethylene ring 5 plays a horizontal limit role through the sleeve fit.

[0052] Figure 4 The structure and use of the viscous damper 6 are described. The viscous damper 6 is a mature device, one end of which is connected to the main controlled structure, and the other end is inserted into the loading rod reserved hole 10 set on the top of the loading limit rod 7. The vibration energy is consumed by the relative movement between the main controlled structure and the loading limit rod 7.

[0053] FIG5 is an illustration of the structure and use of the loading limit rod 7. The upper end is provided with a loading rod loading ring 8, and the loading rod loading ring 8 is in contact with the coil spring 11, so as to transfer the tuning mass to the vertical quasi-zero stiffness spring group. The lower end is provided with a weight plate 9 for holding a large mass weight 15 and a small mass weight 17.

[0054] Figure 6 The structure and use of the coil spring 11 are described below. The coil spring 11 is a mature technology device, the upper end of which acts on the upper end of the loading limit rod 7, and the loading rod loading ring 8; the lower end acts on the lower end of the outer sleeve 1. Together with the series and parallel disc spring groups, they are connected in parallel to form a vertical quasi-zero stiffness spring group, that is, the series and parallel disc spring groups are sleeved on the outer layer of the coil spring 11.

[0055] Figure 7 is an illustration of the use of a vertical quasi-zero stiffness disc spring combination. The disc springs 12 are connected in series and in parallel by positive and negative stacking to form a series and parallel disc spring group. Each disc spring 12 is stacked by an outer loading ring 13 and an inner loading ring 14 to reduce the contact friction between the disc springs 12 and increase the deformation capacity.

[0056] Figure 8 is an explanation of the use of the hanging mass weight. The tuning mass component includes a large mass weight 15 and a small mass weight 17, which can be combined into a complete weight. The lower end of the loading limit rod 7 is provided with a weight plate 9 for supporting the large mass weight 15 and the small mass weight 17. The bottom of the large mass weight 15 and the small mass weight 17 is provided with a weight hanging groove 18 for embedding into the weight plate 9 at the lower end of the loading limit rod 7. By dividing the mass weight into two pieces and designing the weight reserved hole 16, it is convenient to install and level the device.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical tuning damping / vibration device with quasi-zero stiffness characteristics, characterized in that: It includes an outer sleeve, a vertical quasi-zero stiffness spring group, a tuned mass component, a viscous damper, a polytetrafluoroethylene ring and a loading limit rod; The loading limit rod is supported on a vertical quasi-zero stiffness spring group, and the vertical quasi-zero stiffness spring group provides a nonlinear elastic restoring force for the loading limit rod; The two ends of the viscous damper are respectively connected to the main controlled structure and the loading limit rod, and the vibration energy is absorbed by the relative deformation between the two, thereby absorbing the vibration energy of the main controlled structure; The tuned mass component is connected to the bottom end of the loading limit rod and supports the vertical quasi-zero stiffness spring group; under the action of external vibration, the deformation of the vertical quasi-zero stiffness spring group generates up and down reciprocating motion, driving the viscous damper to generate relative deformation energy consumption; The outer sleeve is located at the outer layer of the loading limit rod and the vertical quasi-zero stiffness spring group, and the outer sleeve is provided with a connecting portion connected to the main controlled structure; The inner wall of the outer sleeve is provided with a polytetrafluoroethylene ring groove for fixing the polytetrafluoroethylene ring; the polytetrafluoroethylene ring is sleeved on the loading limit rod for guiding the loading limit rod; The tuning mass component includes a large mass weight and a small mass weight, and the large mass weight and the small mass weight can be combined into a complete weight. The lower end of the loading limit rod is provided with a weight plate for supporting the large mass weight and the small mass weight, and the bottom of the large mass weight and the small mass weight is provided with a weight hanging groove for fixing to the weight plate at the lower end of the limit rod.

2. The vertical tuning damping / vibration device with quasi-zero stiffness characteristics according to claim 1, characterized in that: The outer sleeve adopts a split design, and two or more outer sleeves are assembled together. The connecting part is a hexagon socket bolt hole arranged on the top of the outer sleeve.

3. The vertical tuning damping / vibration reduction device with quasi-zero stiffness characteristics according to claim 1, characterized in that: The vertical quasi-zero stiffness spring group includes a coil spring, a disc spring, an outer loading ring and an inner loading ring; The disc springs are connected in series and in parallel by alternately stacking outer loading rings and inner loading rings to form a series and parallel disc spring group; The upper end of the coil spring acts on the inside of the loading ring of the loading rod set at the upper end of the loading limit rod, and the lower end acts on the lower end of the outer sleeve, and is connected in parallel with the series and parallel disc spring groups to form a vertical quasi-zero stiffness spring group.

4. The vertical tuning damping / vibration device with quasi-zero stiffness characteristics according to claim 3 is characterized in that: An outer sleeve loading ring is provided at the lower end of the outer sleeve for carrying a vertical quasi-zero stiffness spring group.

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