Modular negative stiffness damping device

Abstract

The invention relates to a modular negative stiffness damping device, and belongs to the technical field of structural vibration control. Comprising a transmission base, a connecting shaft, a rack, a bearing, a module fixing hole, a flat key, a gear, a guide rod and a linear bearing, the transmission base comprises a base shell and a base sealing plate; a plurality of connecting shafts are arranged on the base sealing plate in a penetrating manner; the gear is fixed to the middle of the connecting shaft through a flat key, and module connecting ports matched with spline transmission shafts of the negative stiffness module and / or the damping module are formed in the two ends of the connecting shaft. A plurality of groups of module fixing holes are formed in the base sealing plates on the two sides and are used for fixedly mounting the negative stiffness module and / or the damping module; according to the negative stiffness damping device, through the connection mode that the three types of assemblies can be connected through bolts in a Lego-like mode, high performance and customization of the negative stiffness damping device are achieved, and the negative stiffness damping device can be rapidly repaired. On the premise that the requirement of an existing building for the mechanical property of the device is met, extremely high flexibility and adaptability are achieved, and diversification and structural differentiation of operation objects can be effectively dealt with.

Description

Technical Field

[0001] The invention relates to a modular negative stiffness damping device, belonging to the technical field of structural vibration control. Background Art

[0002] Negative stiffness damping can reduce the overall equivalent negative stiffness of the system by introducing negative stiffness into the system, and at the same time realize the dual control of acceleration and displacement of the structure by adding damping. This has broad application prospects for improving the seismic performance of buildings and reducing mechanical vibration. The main types are as follows:

[0003] Negative stiffness friction damping device based on nitrogen spring: This device has the advantages of large stroke, stable mechanical properties, stable and balanced output, etc., and can provide greater pressure under small compression, and has a small installation space. It has large damping force and obvious negative stiffness characteristics, and its mechanical properties can also be adjusted according to the nitrogen spring parameters, negative stiffness element length, friction coefficient, etc. It applies pressure through the nitrogen springs hinged at both ends. The nitrogen springs and the connecting parts at both ends act as negative stiffness elements. The friction damper embodies the quasi-zero stiffness characteristics and presents negative stiffness characteristics according to the stiffness parallel principle. In the initial state, the nitrogen spring is in the state of maximum compression and vertically squeezes the sliding part. When entering the working stage, a certain angle will be generated between the nitrogen spring and the sliding part, causing the damper to generate negative stiffness damping force.

[0004] Half-cycle friction damping device: It has stable mechanical properties, simple structure, large stroke, and negative stiffness characteristics. This device can be effectively used in vibration reduction control of engineering structures, can achieve the expected hysteresis model, and has an ideal control effect on the seismic response of the structure. By increasing the structural damping and extending the structural period, the energy dissipation capacity of the structure can be improved.

[0005] Negative stiffness-inertia damper: It combines the damping advantages of negative stiffness and inertia, and can further control the seismic response of base-isolated structures under earthquakes. Studies have shown that the damping measures of base-isolated composite dampers can effectively reduce the displacement of the isolation layer of the isolation structure, as well as the inter-layer displacement and absolute acceleration response of the upper structure.

[0006] Amplified negative stiffness friction damping wall: The preloaded nitrogen spring force is amplified by the secondary lever system. The amplified elastic force squeezes the friction plate through the rotating rod, and the friction plate embedded at the bottom of the friction plate generates friction with the bottom friction plate. When the damping wall produces relative displacement, the rotating rod generates negative stiffness force along the horizontal component to form negative stiffness damping. It is applied to structural vibration reduction control and has good and stable negative stiffness characteristics. It can achieve the purpose of controlling structural displacement and acceleration response by reducing the equivalent stiffness of the structure and increasing the structural damping.

[0007] However, the existing devices have the following two disadvantages:

[0008] One type cannot provide sufficient damping and can only provide negative stiffness, and needs to be used in conjunction with other dampers to control the problem of amplified displacement response due to reduced stiffness, resulting in an increase in the number of damper arrangements; the other type can provide negative stiffness and damping at the same time, but the adjustment range of its negative stiffness and damping parameters is limited, making it difficult to meet the complex requirements of application scenarios. Summary of the invention

[0009] In view of the above defects in the above-mentioned prior art, the present invention proposes a modular negative stiffness damping device. Its transmission base, negative stiffness module, and damping module have a "Lego"-like freely plug-connected combination. The present invention realizes the high performance, customization, and rapid repairability of the negative stiffness damping device through the separation design and geometric superposition of negative stiffness and damping mechanical properties.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0011] A modular negative stiffness damping device comprises a transmission base, a connecting shaft, a rack, a bearing, a module fixing hole, a flat key, a gear, a guide rod, and a linear bearing;

[0012] The transmission base includes a base shell and base sealing plates on both sides thereof; a plurality of connecting shafts are penetrated through the base sealing plates on both sides;

[0013] The gear is fixed to the middle of the connecting shaft by a flat key, and module connection ports adapted to the spline transmission shaft of the negative stiffness module and / or the damping module are provided at both ends of the connecting shaft, and bearings are nested on the periphery of both ends of the connecting shaft; multiple groups of module fixing holes are provided on the base sealing plates on both sides for realizing the fixed installation of the negative stiffness module and / or the damping module;

[0014] There are multiple module fixing holes, which are evenly distributed on the outer periphery of the bearing;

[0015] The bottom of the rack is grooved, and linear bearings are installed on both sides and the bottom. The linear bearings pass through the guide rods fixed in the base shell to limit and guide the movement of the rack, ensuring the stability of the reciprocating motion of the rack along the axial direction of the device; the rack and the multiple sets of gears arranged above and below are always in a meshing and clamping state.

[0016] Furthermore, a single negative stiffness module or damping module can be arranged on the base sealing plate alone or in combination; or a plurality of superimposed negative stiffness modules or a plurality of superimposed damping modules can be arranged on the base sealing plate alone or in combination; or a negative stiffness module and a damping module can be mixed and superimposed and arranged on the base sealing plate.

[0017] Furthermore, both ends of the transmission base are equipped with connection ports for connection with the main structure, one of which is connected to the outer side of the rack, and the other is connected to the base shell; the main structure is deformed to cause the rack to move axially along the guide rod, driving the gear to rotate, thereby driving the negative stiffness module and the damping module to twist through the spline connection, providing the expected mechanical properties for the modular negative stiffness damping device.

[0018] Furthermore, the damping module comprises a damping module housing, a pressurized sealing plate, a spline transmission shaft of the damping module, a friction plate, a wedge-shaped pre-stressing plate, a spline connection sleeve of the damping module and a flat key of the damping module; the spline connection sleeve of the damping module is vertically penetrated inside the damping module housing; the spline transmission shaft of the damping module is penetrated inside the spline connection sleeve of the damping module, and the two are fixed by the flat key of the damping module; the outer periphery of the spline connection sleeve of the damping module is sleeved with a friction plate; the wedge-shaped pre-stressing plate is pressed tightly between the friction plate and the damping module housing; the pressurized sealing plate is also provided on the top of the damping module housing The bottom of the pressurized closing plate is pressed against the top of the wedge-shaped pre-stressing plate, and a pre-stressing force is applied to the wedge-shaped pre-stressing plate; the wedge-shaped pre-stressing plate is composed of two wedge-shaped pre-stressing plates with two inclined surfaces buckled together, and the bottom of the pressurized closing plate is pressed against one of the wedge-shaped pre-stressing plates, and then the other wedge-shaped pre-stressing plate is squeezed through the inclined surface, thereby converting the vertical downward pre-stressing force into a horizontal squeezing force, which is used to squeeze the friction plate and generate friction damping energy consumption between the friction plate and the wedge-shaped pre-stressing plate; the mechanical properties of the damping module can be adjusted by adjusting the pre-loading torque of the pressurized closing plate, the angle of the wedge-shaped pre-stressing plate and the material difference of the friction plate.

[0019] Furthermore, the pressurized closing plate is connected to the top of the damping module housing by bolts, and a pre-pressure is applied; a circular hole is reserved in the middle of the pressurized closing plate for passing the spline connecting sleeve of the damping module.

[0020] Furthermore, the cross-section of the pressurized closing plate is an inverted L-shape, including a horizontal plate and a vertical plate, the horizontal plate is bolted to the top of the damping module housing, and the vertical plate is pressed against one of the wedge-shaped pre-load plates; the friction plate and the spline connecting sleeve of the damping module are fixed by bolts.

[0021] Furthermore, the bolt is a countersunk bolt; a plurality of fixing holes are provided on the outer side of the damping module housing for fixed installation of the damping module; the damping module housing is rectangular, and the number of the fixing holes is more than 3, which are arranged in a herringbone or matrix shape on the outer side of the damping module housing; the wedge-shaped pre-load plate is arranged on both sides of the inside of the damping module housing, and a plurality of bolts are arranged between the corresponding damping module housing and the pressurized closing plate on each side; the damping module flat key is arranged at the bottom of the friction plate; the bottom of the other wedge-shaped pre-load plate abuts against the bottom plate of the damping module housing.

[0022] Furthermore, the negative stiffness module includes a negative stiffness module shell, a closed cover plate, a module fixing hole, a pin shaft, a pre-compression spring, a telescopic guide rod, a torsion connector, a negative stiffness module spline connecting sleeve, a connecting port, a negative stiffness module flat key and a negative stiffness module spline transmission shaft; the negative stiffness module shell is provided with a closed cover plate and a module fixing hole on the upper and lower sides, a spline is provided at the middle position inside the negative stiffness module shell, and the closed cover plates on the upper and lower sides are sleeved on the outer periphery of the spline; the spline includes an internal negative stiffness module spline transmission shaft and a negative stiffness module spline connecting sleeve sleeved on the outer periphery of the negative stiffness module spline transmission shaft, and the negative The lower part of the spline connecting sleeve of the stiffness module fixes the spline transmission shaft of the negative stiffness module spline transmission shaft through the flat key of the negative stiffness module, and the upper part reserves a spline interface for realizing pin connection with other modules; a connection port is also provided on the outer wall of the spline connecting sleeve of the negative stiffness module; a pre-stressed telescopic device is connected between the connection port and each corner of the negative stiffness module housing; the pre-stressed telescopic device includes a telescopic guide rod and a pre-compression spring sleeved on the telescopic guide rod, and both ends of the telescopic guide rod and the pre-compression spring are fixed and restricted on the torsion connecting pieces on both sides; the torsion connecting piece is connected to the negative stiffness module housing and the connecting port through a pin shaft.

[0023] Furthermore, the negative stiffness module shell is a triangle, and a pre-stressed telescopic device is installed in the middle of each of its three corners; the closed cover plate is connected to the cover plate fixing arm extending from the inner side of the corner of the negative stiffness module shell by bolts; the module fixing hole is arranged in the middle position of the three sides of the negative stiffness module shell; an opening is provided on the side of the negative stiffness module shell for observation.

[0024] Furthermore, the torsion connector is an upper and lower double rib structure, and a torsion connecting arm is provided in the middle of the three corners of the negative stiffness module housing. The torsion connecting arm is inserted into and fixed in the groove between the upper and lower double ribs of the torsion connector through a pin shaft; the telescopic guide rod is telescopically connected to the torsion connectors on both sides.

[0025] The pre-compression spring in the negative stiffness module is always in a pre-compression state regardless of whether it is in the initial state or the working state. When the spline transmission shaft drives the spline connecting sleeve to rotate, the three groups of pre-compression springs are driven to rotate along the rotation direction. The pre-compression spring generates an elastic force component, namely a negative stiffness force, which causes the spline transmission shaft to rotate.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention comprises a negative stiffness module, a damping module and a transmission base which can be connected to each other by means of plugs. The mechanical properties can be flexibly combined and adjusted from multiple dimensions such as the module's own performance, the number of modules and the module combination scheme, thereby making full use of the device's own structural space, achieving high performance and customization of the device while having rapid repair characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of a transmission base of a modular negative stiffness damping device of the present invention;

[0029] Figure 2 1 is an internal display diagram of a modular negative stiffness damping device of the present invention, wherein (a) is an internal view of the modular negative stiffness damping device after removing a sealing plate on one side of the base; (b) is a local detail display diagram of the connecting shaft inside the modular negative stiffness damping device; (c) is a local display diagram of the rack installation inside the modular negative stiffness damping device;

[0030] Figure 3 This is a schematic diagram of the cooperation between the rack and the linear bearing of the present invention;

[0031] Figure 4 It is a schematic diagram of the combined layout scheme of the negative stiffness module and the damping module in a certain module fixing hole in a modular negative stiffness damping device;

[0032] Figure 5 It is a schematic diagram of a modular negative stiffness damping device in a modular combination form of the present invention;

[0033] Figure 6 yes Figure 5 The resulting hysteresis curve;

[0034] Figure 7 It is a three-dimensional view of the overall structure of the damping module of the present invention;

[0035] Figure 8 is an exploded view of the internal structure of the damping module of the present invention;

[0036] Fig. 9 The present invention Figure 8 Top view after removing the pressurized closure plate;

[0037] Fig.10 This is the working principle of the damping module of the present invention;

[0038] Fig.11 It is a demonstration of the mechanical properties of the damping module of the present invention;

[0039] Fig.12 It is a three-dimensional view of the overall structure of the negative stiffness module of the present invention;

[0040] Fig.13 1 is a view of the internal structure of the negative stiffness module of the present invention, wherein: (a) is a view of the internal structure of the negative stiffness module after removing one side of the outer shell; (b) is a schematic diagram of the pre-compression telescopic device in the negative stiffness module; (c) is a schematic diagram of the spline in the negative stiffness module;

[0041] Fig.14is a top view of the negative stiffness module housing of the present invention;

[0042] Fig.15 is a three-dimensional diagram of the negative stiffness module housing of the present invention;

[0043] Fig.16 is a top view of a closed cover plate of a negative stiffness module of the present invention;

[0044] Fig.17 It is a schematic diagram of the spring force of the negative stiffness module in the initial state of the present invention;

[0045] Fig.18 It is a schematic diagram of the spring force and torsion state of the negative stiffness module in the working state of the present invention;

[0046] Fig.19 It is the rotation angle-force relationship curve of the negative stiffness module of the present invention. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1-19 The present invention is further described in detail with specific implementations to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0048] Example 1

[0049] like Figure 1-2 As shown, a modular negative stiffness damping device of the present invention includes a transmission base, a connecting shaft 2, a rack 4, a bearing 6, a module fixing hole 7, a flat key 8, a gear 9, a guide rod 10, and a linear bearing 11. The transmission base includes a base shell 3 and a base sealing plate 1 on both sides thereof. A plurality of connecting shafts 2 are passed through the base sealing plates 1 on both sides. The gear 9 is fixed to the middle of the connecting shaft 2 by a flat key 8, and module connection ports adapted to the spline transmission shaft of the negative stiffness module and / or the damping module are provided at both ends of the connecting shaft 2, and bearings 6 are nested on the periphery of both ends of the connecting shaft 2. A plurality of groups of module fixing holes 7 are provided on the base sealing plates 1 on both sides for realizing the fixed installation of the negative stiffness module 12 and / or the damping module 13. As shown Figure 1 As shown, there are multiple module fixing holes 7 that are evenly distributed on the outer circumference of the bearing 6 .

[0050] like Figure 3 As shown, the bottom of the rack 4 is slotted, and linear bearings 11 are installed on both sides and the bottom of the rack 4. The linear bearings 11 pass through the guide rods 10 fixed in the base housing 3 to limit and guide the movement of the rack 4 and ensure the stability of the reciprocating motion of the rack 4 along the axis of the device. The rack 4 and the multiple sets of gears 9 arranged above and below are always in a meshing and clamping state.

[0051] like Figure 4As shown, in this embodiment, a single negative stiffness module 12 or a damping module 13 can be arranged on the base sealing plate 1 alone or in combination. Alternatively, multiple superimposed negative stiffness modules or multiple superimposed damping modules can be arranged on the base sealing plate 1 alone or in combination. Alternatively, a negative stiffness module and a damping module are mixed and superimposed and arranged on the base sealing plate 1.

[0052] In this embodiment, both ends of the transmission base are provided with connection ports 5 for connection with the main structure, wherein one connection port 5 is connected to the outer side of the rack 4, and the other connection port 5 is connected to the base housing 3. The main structure is deformed to make the rack 4 move axially along the guide rod 10, driving the gear 9 to rotate, and realizing the twisting of the negative stiffness module 12 and the damping module 13 driven by the spline connection, thereby providing the expected mechanical properties for the modular negative stiffness damping device.

[0053] Specifically, Figure 7-11 As shown, the damping module 13 includes a damping module housing 101, a pressurized sealing plate 102, a damping module spline transmission shaft 104, a friction plate 105, a wedge-shaped pre-stressing plate 106, a damping module spline connecting sleeve 107 and a damping module flat key 108. The damping module spline connecting sleeve 107 is vertically penetrated inside the damping module housing 101. The damping module spline transmission shaft 104 is penetrated inside the damping module spline connecting sleeve 107, and the two are limited and fixed by the damping module flat key 108. The friction plate 105 is sleeved on the outer periphery of the damping module spline connecting sleeve 107. A wedge-shaped pre-stressing plate 106 is pressed between the friction plate 105 and the damping module housing 101. A pressurized sealing plate 102 is also provided on the top of the damping module housing 101, and the bottom of the pressurized sealing plate 102 presses against the top of the wedge-shaped pre-stressing plate 106, and applies pre-stress to the wedge-shaped pre-stressing plate 106. The wedge-shaped pre-stressing plate 106 is a wedge-shaped pre-stressing plate with two inclined surfaces buckled together. The bottom of the pressurized closed plate 102 is pressed against one of the wedge-shaped pre-stressing plates 106, and then the other wedge-shaped pre-stressing plate 106 is squeezed through the inclined surface, thereby converting the vertical downward pre-stressing force into a horizontal extrusion force, which is used to squeeze the friction plate 105 and generate friction damping energy consumption between the friction plate 105 and the wedge-shaped pre-stressing plate 106. The mechanical properties of the damping module can be adjusted by adjusting the preload torque of the pressurized closed plate 102, the angle of the wedge-shaped pre-stressing plate 106, and the material difference of the friction plate 105. The pressurized closed plate 102 is connected to the top of the damping module housing 101 by bolts 103, and pre-stress is applied. A circular hole is reserved in the middle of the pressurized closed plate 102 for passing the spline connecting sleeve 107 of the damping module.

[0054] like Figure 8 and Fig.10As shown, the cross section of the pressurized sealing plate 102 is an inverted L-shape, including a horizontal plate and a vertical plate. The horizontal plate is connected to the top bolt 103 of the damping module housing 101, and the bolt 103 is a countersunk bolt. The vertical plate is pressed against one of the wedge-shaped pre-stressing plates 106; the friction plate 105 and the spline connecting sleeve 107 of the damping module are connected and fixed by bolts 103. In this embodiment, a plurality of fixing holes are provided on the outside of the damping module housing 101 for fixing and installing the damping module. The damping module housing 101 is rectangular, and there are 3 fixing holes, which are arranged in a herringbone shape on the outside of the damping module housing 101. The wedge-shaped pre-stressing plates 106 are arranged on both sides of the damping module housing 101, and a plurality of bolts 103 are arranged between the damping module housing 101 and the pressurized sealing plate 102 corresponding to each side. The damping module flat key 108 is arranged at the bottom of the friction plate 105. The bottom of the other wedge-shaped pre-stressing plate 106 abuts against the bottom plate of the damping module housing 101.

[0055] In this embodiment, Figure 10-11 As shown, the torsion direction and the pressure direction are shown, and the mechanical properties of the damping module can be adjusted by adjusting the preload torque of the pressurized sealing plate 102, the angle of the wedge-shaped preload plate 106, and the material difference of the friction plate 105. Among them, the rotation angle is θ and the friction force is f.

[0056] like Figure 12-19 As shown, the negative stiffness module 12 includes a negative stiffness module housing 201, a closed cover plate 202, a module fixing hole 203, a pin 204, a pre-compression spring 205, a telescopic guide rod 206, a torsion connector 207, a negative stiffness module spline connection sleeve 208, a connection port 209, a negative stiffness module flat key 2010, and a negative stiffness module spline transmission shaft 2011. The negative stiffness module housing 201 is provided with a closed cover plate 202 and a module fixing hole 203 on the upper and lower sides, a spline is provided in the middle position inside the negative stiffness module housing 201, and the closed cover plates 202 on the upper and lower sides are sleeved on the outer periphery of the spline. The spline includes an internal negative stiffness module spline transmission shaft 2011 and a negative stiffness module spline connection sleeve 208 sleeved on the outer periphery of the negative stiffness module spline transmission shaft 2011. The lower part of the negative stiffness module spline connection sleeve 208 fixes the spline transmission shaft 2011 through the negative stiffness module flat key 2010, and the upper part is reserved for a spline interface for realizing a pin connection with other modules. A connection port 209 is also provided on the outer wall of the negative stiffness module spline connection sleeve 208. A pre-stress telescopic device is connected between the connection port 209 and each corner of the negative stiffness module housing 201. The pre-stress telescopic device includes a telescopic guide rod 206 and a pre-compression spring 205 sleeved on the telescopic guide rod 206. Both ends of the telescopic guide rod 206 and the pre-compression spring 205 are fixed and restricted on the torsion connector 207 on both sides. The torsion connector 207 is connected to the negative stiffness module housing 201 and the connection port 209 via a pin 204 .

[0057] In this embodiment, the negative stiffness module housing 201 is triangular, and a pre-stressed telescopic device is installed in the middle of each of its three corners. The closed cover plate 202 is connected to the cover plate fixing arm 2012 extending from the inner side of the corner of the negative stiffness module housing 201 by bolts. The module fixing hole 203 is set in the middle position of the three sides of the negative stiffness module housing 201. The side of the negative stiffness module housing 201 is provided with an opening and is observed. The torsion connector 207 is an upper and lower double rib structure, and a torsion connecting arm 2013 is provided in the middle of the three corners of the negative stiffness module housing 201. The torsion connecting arm 2013 is inserted and fixed in the groove between the upper and lower double ribs of the torsion connector 207 through the pin 204. The telescopic guide rod 206 is telescopically connected to the torsion connector 207 on both sides.

[0058] The pre-compression spring 5 in the negative stiffness module is always in a pre-compression state regardless of whether it is in the initial state or the working state. When the spline transmission shaft 11 drives the spline connecting sleeve 8 to rotate, it drives the three groups of pre-compression springs 7 to rotate along the rotation direction. The pre-compression spring 7 generates an elastic force component, namely a negative stiffness force, which causes the spline transmission shaft 11 to rotate.

[0059] Example 2

[0060] like Figure 5 As shown in FIG. 1 , a modular negative stiffness damping device of this embodiment adopts a mixed superposition of negative stiffness modules and damping modules, a total of 5 groups, arranged on the base sealing plate 1, the damping module 13 is coaxially arranged outside the negative stiffness module 12, and the triangular negative stiffness modules 12 are arranged in an up-and-down staggered manner. The overall hysteresis curve is shown in FIG. Figure 6 The other structures are the same as those in Embodiment 1 and will not be described in detail here.

[0061] Example 3

[0062] The modular negative stiffness damping device of this embodiment adopts a single negative stiffness module 12 arranged on the base sealing plate 1. The other structures are the same as those of the embodiment 1 and will not be described in detail here.

[0063] Example 4

[0064] The modular negative stiffness damping device of this embodiment adopts a single damping module 13 arranged on the base sealing plate 1. The other structures are the same as those of the embodiment 1 and will not be described in detail here.

[0065] Example 5

[0066] The modular negative stiffness damping device of this embodiment adopts a separate damping module 13 and a negative stiffness module 12 to be arranged on the base sealing plate 1, with two damping modules 13 connected on the top and three negative stiffness modules 12 connected on the bottom. The other structures are the same as those of the embodiment 1 and will not be described in detail here.

[0067] Example 6

[0068] The modular negative stiffness damping device of this embodiment adopts two coaxially stacked negative stiffness modules 12 arranged on the base sealing plate 1. The other structures are the same as those of the embodiment 1 and will not be described in detail here.

[0069] Example 7

[0070] The modular negative stiffness damping device of this embodiment adopts two coaxially stacked damping modules 13 arranged on the base sealing plate 1. The other structures are the same as those of the embodiment 1 and will not be described in detail here.

[0071] The above is only a preferred embodiment of the present invention, and does not impose any formal limitation on the structure of the present invention. The layout type and the number of uses of the present invention are not limited to this example, and can be optimized and selected according to the actual project. Any modification, equivalent change and decoration of the above embodiment based on the technical principle of the present invention that does not deviate from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A modular negative stiffness damping device, characterized in that: It comprises a transmission base, a connecting shaft (2), a rack (4), a bearing (6), a module fixing hole (7), a flat key (8), a gear (9), a guide rod (10), and a linear bearing (11); The transmission base comprises a base shell (3) and base sealing plates (1) on both sides thereof; a plurality of connecting shafts (2) are provided through the base sealing plates (1) on both sides; The gear (9) is fixed to the middle of the connecting shaft (2) via a flat key (8); module connection ports adapted to the spline transmission shaft of the negative stiffness module and / or the damping module are provided at both ends of the connecting shaft (2); and bearings (6) are nested on the periphery of both ends of the connecting shaft (2); a plurality of groups of module fixing holes (7) are provided on the base sealing plates (1) on both sides for realizing fixed installation of the negative stiffness module and / or the damping module; The module fixing holes (7) are multiple and evenly distributed on the outer periphery of the bearing (6); The bottom of the rack (4) is grooved, and linear bearings (11) are installed on both sides and the bottom of the rack. The linear bearings (11) pass through a guide rod (10) fixed in the base shell (3) to limit and guide the movement of the rack (4) and ensure the stability of the reciprocating movement of the rack (4) along the axial direction of the device; the rack (4) and the multiple groups of gears (9) arranged above and below are always in a meshing and clamping state.

2. A modular negative stiffness damping device according to claim 1, characterized in that: A single negative stiffness module or damping module can be arranged on the base sealing plate (1) alone or in combination; or a plurality of superimposed negative stiffness modules or a plurality of superimposed damping modules can be arranged on the base sealing plate (1) alone or in combination; or a negative stiffness module and a damping module can be mixed and superimposed and arranged on the base sealing plate (1).

3. A modular negative stiffness damping device according to claim 1, characterized in that: Both ends of the transmission base are provided with connection ports (5) for realizing connection with the main structure, wherein one connection port (5) is connected to the outer side of the rack (4), and the other connection port (5) is connected to the base shell (3); the main structure is deformed to cause the rack (4) to move axially along the guide rod (10), driving the gear (9) to rotate, realizing the torsion driving of the negative stiffness module and the damping module through the spline connection, and providing the expected mechanical properties for the modular negative stiffness damping device.

4. A modular negative stiffness damping device according to claim 1, characterized in that: The damping module comprises a damping module housing (101), a pressurized sealing plate (102), a damping module spline transmission shaft (104), a friction plate (105), a wedge-shaped pre-stressing plate (106), a damping module spline connection sleeve (107) and a damping module flat key (108); the damping module spline connection sleeve (107) is vertically inserted into the damping module housing (101); the damping module spline transmission shaft (104) is inserted into the damping module spline connection sleeve (107), and the two are fixed by the damping module flat key (108); the friction plate (105) is sleeved on the outer periphery of the damping module spline connection sleeve (107); the wedge-shaped pre-stressing plate (106) is pressed between the friction plate (105) and the damping module housing (101); the damping module housing (101) is also provided with a The pressurized sealing plate (102) is provided, the bottom of the pressurized sealing plate (102) is pressed against the top of the wedge-shaped pre-stressing plate (106), and a pre-stressing force is applied to the wedge-shaped pre-stressing plate (106); the wedge-shaped pre-stressing plate (106) is composed of two wedge-shaped pre-stressing plates arranged with inclined surfaces buckled together, the bottom of the pressurized sealing plate (102) is pressed against one of the wedge-shaped pre-stressing plates (106), and then the other wedge-shaped pre-stressing plate (106) is squeezed through the inclined surface, thereby converting the vertical downward pre-stressing force into a horizontal squeezing force for squeezing the friction plate (105), and generating friction damping energy consumption between the friction plate (105) and the wedge-shaped pre-stressing plate (106); the mechanical properties of the damping module can be adjusted by adjusting the pre-loading torque of the pressurized sealing plate (102), the angle of the wedge-shaped pre-stressing plate (106) and the material difference of the friction plate (105).

5. A modular negative stiffness damping device according to claim 4, characterized in that: The pressurized sealing plate (102) is connected to the top of the damping module housing (101) via bolts (103) and a pre-pressure is applied; a circular hole is reserved in the middle of the pressurized sealing plate (102) for passing the spline connection sleeve (107) of the damping module.

6. A modular negative stiffness damping device according to claim 5, characterized in that: The cross section of the pressurized sealing plate (102) is an inverted L-shape, comprising a horizontal plate and a vertical plate, wherein the horizontal plate is connected to the top bolt (103) of the damping module housing (101), and the vertical plate is pressed against one of the wedge-shaped pre-compression plates (106); the friction plate (105) is connected and fixed to the spline connecting sleeve (107) of the damping module by bolts (103).

7. A modular negative stiffness damping device according to claim 6, characterized in that: The bolts (103) are countersunk bolts; a plurality of fixing holes are provided on the outer side of the damping module housing (101) for fixing and installing the damping module; the damping module housing (101) is rectangular, and the fixing holes are more than three and are arranged in a herringbone shape or a matrix on the outer side of the damping module housing (101); the wedge-shaped pre-compression plates (106) are arranged on both sides of the inside of the damping module housing (101), and a plurality of bolts (103) are arranged between the damping module housing (101) and the pressurized sealing plate (102) on each side; the damping module flat key (108) is arranged at the bottom of the friction plate (105); and the bottom of another wedge-shaped pre-compression plate (106) abuts against the bottom plate of the damping module housing (101).

8. A modular negative stiffness damping device according to claim 1, characterized in that: The negative stiffness module comprises a negative stiffness module housing (201), a closed cover plate (202), a module fixing hole (203), a pin (204), a pre-compression spring (205), a telescopic guide rod (206), a torsion connector (207), a negative stiffness module spline connection sleeve (208), a connection port (209), a negative stiffness module flat key (2010) and a negative stiffness module spline transmission shaft (2011); the negative stiffness module housing (201) is provided with a closed cover plate (202) and a module fixing hole (203) on the upper and lower sides, a spline is provided at the middle position inside the negative stiffness module housing (201), and the closed cover plates (202) on the upper and lower sides are sleeved on the outer periphery of the spline; the spline comprises an internal negative stiffness module spline transmission shaft (2011) and a negative stiffness module spline connection sleeve (208) sleeved on the outer periphery of the negative stiffness module spline transmission shaft (2011) The lower part of the spline connection sleeve (208) of the negative stiffness module fixes the spline transmission shaft (2011) of the spline transmission shaft of the negative stiffness module through the flat key (2010) of the negative stiffness module, and the upper part is reserved for a spline interface for realizing pin connection with other modules; a connection port (209) is also arranged on the outer wall of the spline connection sleeve (208) of the negative stiffness module; a pre-stress telescopic device is connected between the connection port (209) and each corner of the negative stiffness module housing (201); the pre-stress telescopic device comprises a telescopic guide rod (206) and a pre-compression spring (205) sleeved on the telescopic guide rod (206), and both ends of the telescopic guide rod (206) and the pre-compression spring (205) are fixed and restricted on the torsion connectors (207) on both sides; the torsion connector (207) is connected to the negative stiffness module housing (201) and the connection port (209) through a pin shaft (204).

9. A modular negative stiffness damping device according to claim 8, characterized in that: The negative stiffness module housing (201) is triangular in shape, and a pre-stressed telescopic device is installed in the middle of each of its three corners; the closed cover plate (202) is connected to the cover plate fixing arm (2012) extending from the inner side of the corner of the negative stiffness module housing (201) by bolts; the module fixing hole position (203) is arranged in the middle position of the three sides of the negative stiffness module housing (201); and an opening is provided on the side of the negative stiffness module housing (201) for observation.

10. A modular negative stiffness damping device according to claim 9, characterized in that: The torsion connection piece (207) is an upper and lower double rib structure; a torsion connection arm (2013) is provided at the middle of the three corners of the negative stiffness module housing (201); the torsion connection arm (2013) is inserted into and fixed in a groove between the upper and lower double ribs of the torsion connection piece (207) through a pin shaft (204); and the telescopic guide rod (206) is telescopically connected to the torsion connection pieces (207) on both sides.

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