Self-powered Adaptive Variable Stiffness Composite Damping Nonlinear Energy Sink

Abstract

The present invention provides a self-powered, adaptive, variable-stiffness, composite-damped nonlinear energy well, comprising: a composite damping portion, a nonlinear energy well portion, a control portion, and a self-powered portion. The self-powered, adaptive, variable-stiffness, composite-damped nonlinear energy well proposed by the present invention can adjust the stiffness of the nonlinear energy well in real time by changing the temperature of the shape memory alloy spring; by controlling the step-by-step push-pull rod to change the magnetic permeability spacing between the conductor plate and the permanent magnet, the damping of the nonlinear energy well can be adjusted in real time. Composite damping is formed by combining collision damping formed by collisions between encapsulated steel balls and liquid damping formed by oscillation of the liquid within the box to ensure optimal vibration and shock dual-control effects; the oscillating liquid within the box drives the gears to rotate, which are connected to a permanent magnet DC generator via a screw to supply power to the control center, thereby ensuring energy supply stability under extreme disasters.

Description

Technical Field

[0001] The invention belongs to the technical fields of civil engineering and vibration control, and particularly relates to a self-powered, adaptive, variable-stiffness, composite-damping, nonlinear energy sink. Background Art

[0002] Natural disasters such as typhoons and earthquakes pose a significant threat to human life and property safety. The extreme loads they bring often cause significant damage to building structures. Ensuring the stability and comfort of building structures under extreme loads has become a major challenge. Previously, people reinforced building structures to resist damage under extreme loads, but this method is uneconomical and does not completely solve the problem. Therefore, structural control technology has emerged. Tuned mass dampers are a commonly used passive structural control device, but their vibration control effect is very sensitive to the frequency of the building structure. Nonlinear energy sinks are nonlinear structural control devices that maintain high vibration damping performance even after the structural frequency changes, essentially solving the problem of frequency sensitivity of the control device. However, traditional nonlinear energy sinks can only control vibrations within a specific frequency range and are difficult to achieve semi-active or active control in extreme disaster situations. Therefore, a self-powered adaptive nonlinear energy sink is urgently needed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a self-powered, adaptive, variable-stiffness, composite-damping nonlinear energy sink that can adjust its own stiffness and damping while being self-powered. Compared with traditional nonlinear energy sinks, it has better dual-control effects of vibration and shock, ensuring the stability of energy supply under extreme disasters.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A self-powered, adaptive, variable-stiffness, composite damping, nonlinear energy well, comprising: a composite damping portion, a nonlinear energy well portion, a control portion, and a self-powered portion. Specifically, the nonlinear energy well comprises: a control hub; a permanent magnet direct current generator for supplying power to the control hub; a housing mounted on an arcuate guide rail via a roller disposed at its bottom; the housing containing a liquid containing a plurality of encapsulated steel balls; a plurality of permanent magnets uniformly adsorbed on both sides of the housing; a screw connected to the permanent magnet direct current generator, the screw being provided with a gear; a shape memory alloy spring disposed at each end of the housing, one end of the shape memory alloy spring being fixed to one end face of the housing via a snap-fit connection, and the other end being fixed to a pier extending in the same direction as the housing end; and a magnetic steel plate and a conductor plate, both of which are bolted together and disposed on both sides of the housing, the magnetic steel plate being located outside the conductor plate, and a stepping push-pull rod being bolted to the magnetic steel plate.

[0006] The permanent magnet, magnetic steel plate, conductor plate, wrapped steel ball and liquid in the box constitute the composite damping part of the nonlinear energy well, which provides liquid damping force through the oscillation of the liquid and provides collision damping force through the collision between the wrapped steel balls in the liquid.

[0007] The box, rollers and arc-shaped guide rails constitute the nonlinear energy well portion of the nonlinear energy well, and the curvature radius of the arc-shaped guide rails at different horizontal positions is different to achieve nonlinear restoring force.

[0008] The gears, screws and permanent magnet DC generators constitute the self-powered part of the nonlinear energy well. The liquid oscillating in the box drives the gears to rotate, and the screws are connected to the permanent magnet DC generator to supply power to the control center. Preferably, the number of the gears is 3 to 6.

[0009] The step-by-step push-pull rod, control center and shape memory alloy spring constitute the control part of the nonlinear energy well. The control center receives signals from the displacement meter and accelerometer installed on the building structure to perform real-time adjustment of the stiffness and damping of the nonlinear energy well.

[0010] Specifically, the control center adjusts the stiffness of the nonlinear energy well in real time by changing the temperature of the shape memory alloy spring; the control center controls the stepping push-pull rod to change the magnetic permeability distance between the conductor plate and the permanent magnet to achieve real-time adjustment of the damping of the nonlinear energy well.

[0011] Preferably, the number of the shape memory alloy springs is four, with two symmetrically provided at each end.

[0012] The wrapped steel balls include steel balls and an outer material covering the steel balls, the outer material preferably being a rubber material to reduce the noise generated when the steel balls collide. Preferably, the number of the wrapped steel balls is 10 to 30.

[0013] Preferably, the thickness of the conductor plate is 5 cm to 8 cm; the thickness of the magnetic steel plate is 5 cm to 8 cm; and the adjustable length range of the step-type push-pull rod is 0 to 2 m.

[0014] The self-powered adaptive variable stiffness composite damping nonlinear energy well proposed in the present invention can adjust the stiffness of the nonlinear energy well in real time by changing the temperature of the shape memory alloy spring; the magnetic permeability spacing between the conductor plate and the permanent magnet is changed by controlling the stepping push-pull rod to realize real-time adjustment of the damping of the nonlinear energy well, and the collision damping formed by the collision between the wrapped steel balls and the liquid damping formed by the oscillation of the liquid in the box are combined to form a composite damping to ensure the best vibration and shock dual control effect; the oscillating liquid in the box is used to drive the gear to rotate, and the gear is connected to the permanent magnet DC generator through a screw to supply power to the control center, thereby ensuring the stability of energy supply under extreme disasters.

[0015] The above solution has the following beneficial effects:

[0016] First, the nonlinear energy sink of the present invention can change its own stiffness, which has stronger adaptability than the traditional nonlinear energy sink with immutable stiffness.

[0017] Second, the nonlinear energy sink of the present invention combines semi-active eddy current damping, collision damping and liquid damping to form a composite damping, which can consume the energy generated by the vibration of the building structure to the greatest extent, so as to achieve a better vibration and shock dual control effect.

[0018] Third, the nonlinear energy sink of the present invention utilizes oscillating liquid for self-power supply, thus ensuring the stability of energy supply under extreme disasters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural front view of the self-powered, adaptive, variable-stiffness, composite-damping, nonlinear energy sink of the present invention.

[0020] Figure 2 This is a top view of the structure of the self-powered adaptive variable stiffness composite damping nonlinear energy sink of the present invention.

[0021] Figure 3 This is a self-powered control flow chart of the self-powered adaptive variable stiffness composite damping nonlinear energy sink of the present invention.

[0022] Figure numerals: 1-control center, 2-pier, 3-shape memory alloy spring, 4-arc guide rail, 5-gear, 6-box, 7-magnetic steel plate, 8-conductor plate, 9-permanent magnet, 10-wrapped steel ball, 11-roller, 12-stepping push-pull rod, 13-screw, 14-permanent magnet DC generator, 15-liquid. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, the embodiments are not intended to limit the present invention. Any similar structure and similar variations of the present invention should be included in the protection scope of the present invention.

[0024] The self-powered adaptive variable stiffness composite damping nonlinear energy well of the present invention comprises: a composite damping part, a nonlinear energy well part, a control part and a self-powered part. As shown in the figure, the self-powered adaptive variable stiffness composite damping nonlinear energy well of the present invention comprises: a control center 1; a permanent magnet DC generator 14 for supplying power to the control center 1; a box 6 is mounted on an arc guide rail 4 via a roller 11 at the bottom thereof, the interior of the box 6 is filled with liquid 15, a number of 10 to 30 wrapped steel balls 10 are arranged in the liquid 15, a number of permanent magnets 9 are evenly adsorbed on both sides of the box 6, and a screw 13 connected to the permanent magnet DC generator 14 is also provided in the box 6, and the screw 13 is provided with a gear 5; four shape memory alloy springs 3 are arranged in groups of two at both ends of the box body 6, one end of the shape memory alloy spring 3 is fixed to one end face of the box body 6 by a snap connection, and the other end is fixed to the pier 2 located on the extension direction of the same side end of the box body 6 by a snap connection; the magnetic steel plate 7 and the conductor plate 8 are connected by bolts and are jointly arranged on both sides of the box body 6, the magnetic steel plate 7 is located on the outside of the conductor plate 8, and the stepping push-pull rod 12 is fixed to the magnetic steel plate 7 by bolts.

[0025] Composite damping part

[0026] The composite damping part includes a permanent magnet 9, a magnetic steel plate 7, a conductive plate 8, an encapsulated steel ball 10, and a liquid 15 in the housing 6. The liquid damping force is provided by the oscillation of the liquid 15, and the collision damping force is provided by the collision between the encapsulated steel balls 10 in the liquid 15.

[0027] Among them, the wrapped steel ball 10 includes a steel ball and an external material covering the steel ball, and the material is preferably a rubber material to reduce the noise generated when the steel ball collides; the liquid 15 can be water or silicone oil; the thickness of the conductor plate 8 is designed to be 5 cm~8 cm; the thickness of the magnetic steel plate 7 is designed to be 5 cm~8 cm.

[0028] Nonlinear energy sink

[0029] The nonlinear energy sink part is composed of a box 6, a roller 11 and an arc-shaped guide rail 4.

[0030] The curvature radius of the arc-shaped guide rail 4 at different horizontal positions is different to achieve nonlinear restoring force.

[0031] Control section

[0032] The control unit consists of a stepping push-pull rod 12, a control hub 1, and a shape memory alloy spring 3. The control hub 1 receives signals from displacement sensors and accelerometers mounted on the building structure to adjust the stiffness and damping of the nonlinear energy well in real time. The specific data collection, transmission, processing, and analysis, as well as the corresponding control and adjustment algorithms, are not part of the technical problem to be solved by this invention and are well-known to those skilled in the art, so they will not be elaborated here.

[0033] The control center 1 adjusts the stiffness of the nonlinear energy well in real time by changing the temperature of the shape memory alloy spring 3; the control center 1 controls the stepping push-pull rod 12 to change the magnetic permeability distance between the conductor plate 8 and the permanent magnet 9 to achieve real-time adjustment of the damping of the nonlinear energy well.

[0034] Among them, the adjustable length range of the stepping push-pull rod is 0~2m.

[0035] Self-powered part

[0036] The self-powered part consists of a gear 5, a screw 13, and a permanent magnet DC generator 14. The oscillating liquid 15 in the box 6 drives the gear 5 to rotate, and is connected to the permanent magnet DC generator 14 through the screw 13 to supply power to the control center 1.

[0037] The number of gears 5 is 3 to 6.

[0038] The above description is only a description of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any changes or modifications made by any person skilled in the art based on the above disclosed technical content should be regarded as equivalent valid embodiments and fall within the scope of protection of the technical solution of the present invention.

Claims

1. A self-powered, adaptive, variable stiffness, composite damping, nonlinear energy sink, characterized in that: The nonlinear energy well comprises: Control center (1); A permanent magnet DC generator (14) for supplying power to the control center (1); A box (6) is mounted on an arc-shaped guide rail (4) via a roller (11) provided at the bottom thereof. The box (6) is filled with a liquid (15), a plurality of wrapped steel balls (10) are provided in the liquid (15), a plurality of permanent magnets (9) are uniformly adsorbed on both sides of the box (6), and a screw (13) connected to the permanent magnet DC generator (14) is further provided in the box (6), and a gear (5) is provided on the screw (13); Shape memory alloy springs (3) are respectively arranged at both ends of the box body (6), one end of the shape memory alloy spring (3) is fixed to one end surface of the box body (6) by a snap connection, and the other end is fixed to a buttress (2) located in the extension direction of the same side end of the box body (6) by a snap connection; and The magnetic steel plate (7) and the conductor plate (8) are connected by bolts and are arranged on both sides of the box (6), the magnetic steel plate (7) is located outside the conductor plate (8), and the stepping push-pull rod (12) is fixed to the magnetic steel plate (7) by bolts; in: The permanent magnet (9), the magnetic steel plate (7), the conductor plate (8), the wrapped steel ball (10) and the liquid (15) in the box (6) constitute a composite damping part of the nonlinear energy well, providing a liquid damping force through the oscillation of the liquid (15) and providing a collision damping force through the collision between the wrapped steel balls (10) in the liquid (15); The box (6), the roller (11) and the arc-shaped guide rail (4) constitute a nonlinear energy well portion of the nonlinear energy well, and the curvature radius of the arc-shaped guide rail (4) at different horizontal positions is different to realize a nonlinear restoring force; The gear (5), screw (13) and permanent magnet DC generator (14) constitute the self-powered part of the nonlinear energy well, and the oscillating liquid (15) in the box (6) drives the gear (5) to rotate, and is connected to the permanent magnet DC generator (14) through the screw (13) to supply power to the control center (1); The step-by-step push-pull rod (12), the control center (1) and the shape memory alloy spring (3) constitute the control part of the nonlinear energy well. The control center (1) receives signals from a displacement meter and an accelerometer installed on the building structure to perform real-time adjustment of the stiffness and damping of the nonlinear energy well.

2. The nonlinear energy sink according to claim 1, wherein: The control center (1) adjusts the stiffness of the nonlinear energy well in real time by changing the temperature of the shape memory alloy spring (3); the control center (1) controls the stepping push-pull rod (12) to change the magnetic permeability distance between the conductor plate (8) and the permanent magnet (9) to achieve real-time adjustment of the damping of the nonlinear energy well.

3. The nonlinear energy sink according to claim 1, wherein: The wrapped steel ball (10) comprises a steel ball and a rubber material covering the outside of the steel ball.

4. The nonlinear energy sink according to claim 1, wherein: The number of the wrapped steel balls (10) is 10 to 30.

5. The nonlinear energy sink according to claim 1, wherein: The thickness of the conductor plate (8) is 5 cm to 8 cm.

6. The nonlinear energy sink according to claim 1, wherein: The thickness of the magnetic steel plate (7) is 5 cm to 8 cm.

7. The nonlinear energy sink according to claim 1, wherein: The adjustable length range of the step-type push-pull rod is 0~2m.

8. The nonlinear energy sink according to claim 1, wherein: The number of the gears (5) is 3 to 6.

9. The nonlinear energy sink according to claim 1, wherein: The liquid (15) may be water or silicone oil.

10. The nonlinear energy sink according to claim 1, wherein: The number of the shape memory alloy springs (3) is four, and two of the shape memory alloy springs (3) are symmetrically provided at each end.

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