Self-powered rotary flat-torsion coupled self-adaptive liquid damper

Abstract

The invention provides a self-powered rotary type flat torsion coupling self-adaptive liquid damper which comprises a damping system, a sliding rail system, a flat torsion coupling mechanism, a self-adaptive control system and a self-powered part. Wherein the damping system comprises a U-shaped liquid column damper, magnetorheological fluid, a magnet exciting coil and a magnetic isolation net; the sliding rail system comprises an annular rail, a pulley yoke and a pulley; the flat torsion coupling mechanism comprises a torsion spring support, a torsion spring, a rotating rod and a damper support. The self-adaptive control system comprises a processing and control center, an accelerometer, an anemograph and a liquid level meter; and the self-powered part comprises piezoelectric ceramics and a variable current power supply. The translation response and the torsion response of the structure can be controlled at the same time, self-adaptive translation-torsion coupling control is achieved, the wind vibration control performance is improved, and the comfort and the safety of the structure are guaranteed. In addition, the piezoelectric ceramics are used for converting mechanical energy into electric energy for self power supply, and the vibration control effect of the damper under extreme conditions is ensured.

Description

Technical Field

[0001] The invention belongs to the technical fields of civil engineering and vibration control, and in particular relates to a self-powered rotary flat-torsion coupled adaptive liquid damper. Background Art

[0002] For high-rise and super-high-rise buildings and long-span bridges, wind loads are the culprit for the reduction of structural stability and comfort. In the early days, the influence of wind vibration was resisted by strengthening and strengthening the structure itself. In 1960, Kabori and Minai proposed the concept of wind vibration control. Compared with the reinforcement and strengthening of the structure itself, wind vibration control introduces additional control systems in the structure, which has obvious advantages. Wind vibration control can be divided into active control (with external energy input), semi-active control (partial energy input) and passive control (without external energy input) according to whether there is external energy input. When wind vibration control is active control, active tuned mass dampers and active mass dampers are usually used; when wind vibration control is semi-active control, active variable stiffness systems and active variable damping systems are usually used; when wind vibration control is passive control, energy-consuming elements are usually set to achieve control effects.

[0003] The tuned liquid column damper is usually a U-shaped rectangular water tank filled with liquid. The damper frequency is made close to the frequency of the controlled object by adjusting the liquid length. When vibrating, the liquid head loss caused by the liquid movement and the viscosity in the boundary layer is used to dissipate energy. The general tuned liquid column damper can only control the vibration response of the structure in a single direction, and cannot adjust the damper's own parameters in real time. Even if the damper's own parameters can be adjusted in real time, the stability of energy supply cannot be maintained in extreme cases.

[0004] Irregularly shaped building structures will not only have translational displacement but also torsional response under the action of typhoons. The torsional response will not only further amplify the translational response of the structure, but also cause torsional damage to the structural components. Therefore, it is very important to simultaneously control the translational and torsional responses of the structure under typhoons. At the same time, the mass dampers currently used in engineering can only control the unidirectional vibration of the structure. If the bidirectional vibration of the structure is to be controlled at the same time, at least two mass dampers need to be arranged, which will not only occupy the use space of the building, but also cause the burden of concentrated loads on the floors, and will also increase the construction cost. Therefore, it is very valuable to invent a new type of damper that can simultaneously control the bidirectional vibration and torsional response of the structure. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a self-powered rotary translational-torsion coupled adaptive liquid damper, which can adjust its own main vibration direction and damping in real time, control the translational response and torsion of the structure, and achieve self-powering even in extreme environments. Compared with traditional tuned liquid dampers, it has better adaptability and vibration control effect.

[0006] The objective of the present invention is achieved through the following technical solutions: A self-powered rotary flat-torsion coupled adaptive liquid damper comprises a damping system, a slide rail system, a flat-torsion coupling mechanism, an adaptive control system, and a self-powered part, wherein: The damping system comprises a U-shaped liquid column damper 10, a magnetorheological fluid 11, an excitation coil 12 and a magnetic isolation net 8, wherein the magnetorheological fluid 11 is arranged in the cavity of the U-shaped liquid column damper 10, the excitation coil 12 is arranged outside the vertical section of the U-shaped liquid column damper 10, and the magnetic isolation net 8 is arranged inside the horizontal section and part of the vertical section of the U-shaped liquid column damper 10; The slide rail system includes an annular track 4, a pulley frame 15 and a pulley 5. The pulley 5 is limited on the annular track 4 and can slide along the annular track 4. The pulley 5 is connected to the U-shaped liquid column damper 10 of the damping system through the pulley frame 15, so that the U-shaped liquid column damper 10 can slide on the annular track 4 through the pulley 5. The flat-torsion coupling mechanism comprises a torsion spring support 2, a torsion spring 3, a rotating rod 7, and a damper bracket 9. The torsion spring support 2 is fixed on the structure; the torsion spring 3 is fixed at its lower end to the torsion spring support 3, and its upper end is fixed to the bottom of the circular track 4; the rotating rod 7 is fixed at its lower end to the bottom of the circular track 4, and its upper end is connected and fixed to the damper bracket 9; the damper bracket 9 is connected to the center of the bottom of the U-shaped liquid damper; The adaptive control system comprises a processing and control center 1, an accelerometer 14, an anemometer 16, and a liquid level meter 17. The accelerometer 14 and anemometer 16 are installed on the structure; the liquid level meter 17 is installed at the bottom of the U-shaped liquid damper 10; the input of the processing and control center 1 is electrically connected to the accelerometer 14 and the anemometer 16, receives signals from the accelerometer 14, the anemometer 16, and the liquid level meter 17, and determines the main vibration direction in the plane of the structure and adjusts the damping in real time; The self-powered part includes piezoelectric ceramics 6 and a variable current power supply 13. The piezoelectric ceramics 6 are connected to the variable current power supply 13, and the variable current power supply 13 is connected to the processing and control center 1 and the excitation coil 12 of the damping system; the piezoelectric ceramics 6 are arranged on the surface of the circular track 4. After being compressed, the piezoelectric ceramics 6 convert mechanical energy into electrical energy and store it in the variable current power supply 13. The variable current power supply 13 supplies power to the processing and control center 1 and the excitation coil 12.

[0007] Due to the adoption of the above scheme, the present invention has the following beneficial effects: First, the adaptive liquid damper of the present invention can rotate along a circular track to ensure the best main vibration direction, so as to improve the vibration control effect of the damper.

[0008] Second, the adaptive liquid damper of the present invention can realize the coupled control of structural translation and torsion, and has better stability than the traditional liquid damper.

[0009] Third, the adaptive liquid damper of the present invention can change its own damping. Compared with the conventional liquid damper with immutable damping, the present invention has better vibration reduction performance.

[0010] Fourthly, the adaptive liquid damper of the present invention can utilize piezoelectric ceramics to convert mechanical energy into electrical energy for self-power supply, thereby ensuring the vibration control effect of the damper under extreme conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural front view of the self-powered rotary torsional coupling adaptive liquid damper of the present invention.

[0012] Figure 2 for Figure 1 Top view of the .

[0013] Figure 3 This is a control flow chart of the self-powered rotary torsional coupling adaptive liquid damper of the present invention.

[0014] Figure 4 for Figure 3 The switching of the magnetorheological fluid inside the damper between the away / equilibrium position states: (a) is a schematic diagram of the magnetorheological fluid inside the damper away from the equilibrium position, and (b) is a schematic diagram of the magnetorheological fluid inside the damper returning to the equilibrium position.

[0015] Reference numerals: Processing and control center 1, torsion spring support 2, torsion spring 3, circular track 4, pulley 5, piezoelectric ceramics 6, rotating rod 7, magnetic isolation net 8, damper bracket 9, U-shaped liquid column damper 10, magnetorheological fluid 11, excitation coil 12, variable current power supply 13, accelerometer 14, pulley frame 15, anemometer 16, liquid level meter 17. DETAILED DESCRIPTION

[0016] The technical solution provided by the present application will be further described below in conjunction with specific embodiments and accompanying drawings. The advantages and features of the present application will become more apparent with the following description.

[0017] A self-powered rotary flat-torsion coupled adaptive liquid damper comprises a damping system, a slide rail system, a flat-torsion coupling mechanism, an adaptive control system, and a self-powered part, wherein: The damping system includes a U-shaped liquid column damper 10, a magnetorheological fluid 11, an excitation coil 12 and a magnetic isolation net 8. The magnetorheological fluid 11 is arranged in the cavity of the U-shaped liquid column damper 10, the excitation coil 12 is fixed to the outside of the vertical section of the U-shaped liquid column damper 10 by bolt connection or sleeve connection, and the magnetic isolation net 8 is arranged on the inside of the horizontal section and part of the vertical section of the U-shaped liquid column damper 10.

[0018] Preferably, the material of the magnetic isolation net 8 can be ferrite, graphite or other magnetic isolation materials; the thickness of the magnetic isolation net 8 is 3 cm to 10 cm.

[0019] The slide rail system includes an annular track 4, a pulley frame 15 and a pulley 5. The pulley 5 is directly placed on the annular track 4 and can slide along the annular track 4. The pulley 5 is connected to the U-shaped liquid column damper 10 of the damping system through the pulley frame 15, so that the U-shaped liquid column damper 10 can slide on the annular track 4 through the pulley 5. Further, the pulley frame 15 and the pulley 5 have two groups, which are respectively located at the two ends of the bottom of the U-shaped liquid column damper 10 of the damping system. Furthermore, the pulley 5 and the pulley frame 15 are connected by bolts through holes, and the U-shaped liquid column damper 10 is fixed to the pulley frame 15 by bolt connection.

[0020] Preferably, a gap of 5 mm to 1.5 cm is left between the pulley frame 15 and the annular track 4.

[0021] The flat-torsion coupling mechanism includes a torsion spring support 2, a torsion spring 3, a rotating rod 7, and a damper bracket 9. The torsion spring support 2 is fixed to a structure (not shown in the figure) by welding; the torsion spring 3 is fixed to the torsion spring support 3 at its lower end by a snap connection, and is fixed to the bottom of the annular track 4 at its upper end by a snap connection; the rotating rod 7 is fixed to the bottom of the annular track 4 at its lower end by a bolt connection, and is connected and fixed to the damper bracket 9 at its upper end by bolts; the damper bracket 9 is connected to the center of the bottom of the U-shaped liquid damper by bolts. Further, the rotating rod 7 is driven by a stepper motor (not shown in the figure).

[0022] The adaptive control system includes a processing and control center 1, an accelerometer 14, an anemometer 16, and a liquid level meter 17. The accelerometer 14 and anemometer 16 are installed on a structure (not shown in the figure); the liquid level meter 17 is installed at the bottom of the U-shaped liquid damper 10; the input of the processing and control center 1 is electrically connected to the accelerometer 14 and the anemometer 16, receives signals from the accelerometer 14, the anemometer 16 and the liquid level meter 17, and determines the main direction of vibration in the plane of the structure and adjusts the damping in real time.

[0023] Furthermore, the processing and control center 1 includes a motor control module, which is used to control a stepper motor (not shown in the figure) to drive the rotating rod 7 of the translational coupling mechanism.

[0024] Furthermore, the accelerometer 14 and the anemometer 16 are installed in both directions of the structure X and Y; and the liquid level meter 17 is installed at both ends of the bottom of the U-shaped liquid damper 10 .

[0025] The self-powered part includes a piezoelectric ceramic 6 and a variable current power supply 13. The piezoelectric ceramic 6 is connected to the variable current power supply 13, and the variable current power supply 13 is connected to the processing and control center 1 and the excitation coil 12 of the damping system. The piezoelectric ceramic 6 is arranged on the surface of the annular track 4. After being compressed, the piezoelectric ceramic 6 converts mechanical energy into electrical energy and stores it in the variable current power supply 13. The variable current power supply 13 supplies power to the processing and control center 1 and the excitation coil 12.

[0026] Based on the above structure, the present invention can achieve three-level regulation: First-level regulation: the processing and control center 1 receives signals from the accelerometer 14 and the anemometer 16 to determine the main vibration direction in the structural plane; then, by controlling the rotation of the rotating rod 7, the U-shaped liquid column damper 10 is driven to rotate to the main vibration direction in the structural plane to achieve preliminary control of the main vibration direction of the structure; Second level regulation: The processing and control center 1 can determine the internal liquid state of the U-shaped liquid column damper according to the signal of the liquid level meter 17, and use the variable current power supply 13 to change the current of the excitation coil 12, so as to adjust the internal liquid damping of the U-shaped liquid column damper in real time to achieve more optimized energy dissipation and vibration reduction performance; The third level of regulation: The U-shaped liquid column damper can use the torsion spring 3 to further reduce the torsion of the structure and improve the vibration control performance of the U-shaped liquid column high damper, thereby ultimately achieving adaptive transverse torsion coupling control.

[0027] The present invention also utilizes the piezoelectric ceramics 6 in the annular track 4 to convert mechanical energy into electrical energy after being compressed, and supplies power to the processing and control center 1 and the excitation coil 12, thereby ensuring the vibration control effect and power supply reliability of the U-shaped liquid column damper under extreme conditions.

[0028] The transverse-torsion coupling mechanism and the adaptive control system can maximize the inertial force of the damper, the damping system can maximize the damping force of the damper, and the self-powered part can minimize the power consumption of the damper. The coordinated control of the above parts optimizes the self-powered adaptive control performance of the damper.

[0029] Specifically, Figure 2 , Figure 3As shown, the first level of regulation: Specifically, the wind direction and wind speed of a typhoon are uncertain, and the wind attack angle of each typhoon on the structure is different, resulting in different vibration responses and torsional responses of the structure in the X and Y directions in the plane. The accelerometer 14 and anemometer 16 installed in the X and Y directions of the structure can respectively measure the vibration acceleration response signals a of the structure in the X and Y directions. x (t), a y (t) and the wind speed signal of the typhoon, the processing and control center 1 superimposes the signal vectors of the anemometer and the accelerometer to calculate the wind attack angle of the typhoon, that is, the main vibration direction D of the structure (the angle with the X axis is ), the rotation of the rotating rod 7 is controlled by a stepping motor to adjust the vibration direction of the tuned liquid column damper 10 to the main vibration direction D of the structure, thereby achieving the best structural vibration control effect.

[0030] Specifically, Figure 4 As shown, the second level of regulation: Typhoon excitation is a stationary random process. The wind load at different times is different, and the optimal damping coefficient of the tuned liquid column liquid column damper is also different. In the present invention, the tuned liquid column liquid column damper is a U-shaped liquid column damper. The U-shaped liquid column damper 10 contains a magnetorheological fluid 11, and its damping characteristics are related to the amount of current flowing. Specifically, the material density of the magnetorheological fluid 11 is related to the amount of current flowing. The greater the amount of current flowing, the denser it is and the greater the damping provided. The processing and control center 1 is connected to the variable current power supply 13 through wires, and the variable current power supply 13 is connected to the excitation coil 12 through wires. The excitation coil 12 inputs current into the magnetorheological fluid 11 through direct contact.

[0031] In order to improve the instantaneous vibration reduction performance of the U-shaped liquid column damper, the processing and control center 1 changes the current passing through the excitation coil 12 by controlling the variable current power supply 13 to change the current flowing into the magnetorheological fluid 11, thereby adjusting the density and damping of the magnetorheological fluid material in real time, and realizing real-time adjustment of the damping. Specifically: The liquid level in the U-shaped liquid column damper is determined in real time by the liquid level meter 17. When the difference between the liquid level and the equilibrium position increases, it is far away from the equilibrium position, and vice versa, it is returning to the equilibrium position. When the magnetorheological fluid 11 in the damper shakes in a direction away from the equilibrium position, the current flowing into the excitation coil 12 is reduced, that is, the damping is reduced; When the swaying direction of the magnetorheological fluid 11 in the damper is returning to the equilibrium position, the current flowing into the excitation coil 12 is increased, that is, the damping is increased; The translational response of the structure is reduced by the shaking of the magnetorheological fluid 11 in the U-shaped liquid column damper 10 along the main direction of in-plane vibration.

[0032] The third level of regulation: The U-shaped liquid column damper provides a reverse torque under the action of external torque through the torsion spring 3 to control the torsion of the structure and realize the function of reducing the torsion of the structure. The torsion stiffness of the torsion spring 3 is adjusted to tune its anti-torsion frequency to be consistent with the torsion frequency of the structure to realize the torsion response control of the structure.

[0033] In summary, the present invention can simultaneously control the translational response and torsional response of the structure, realize adaptive translational torsional coupling control, improve the wind vibration control performance, and ensure the comfort and safety of the structure.

[0034] 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 contents shall be regarded as equivalent effective embodiments and shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A self-powered rotary torsion-translatory adaptive liquid damper, characterized in that: It includes a damping system, a slide rail system, a torsion coupling mechanism, an adaptive control system, and a self-powered part, among which: The damping system comprises a U-shaped liquid column damper (10), a magnetorheological fluid (11), an excitation coil (12) and a magnetic isolation net (8), wherein the magnetorheological fluid (11) is arranged in a cavity of the U-shaped liquid column damper (10), the excitation coil (12) is arranged outside a vertical section of the U-shaped liquid column damper (10), and the magnetic isolation net (8) is arranged inside a horizontal section and part of a vertical section of the U-shaped liquid column damper (10); The slide rail system comprises an annular track (4), a pulley frame (15) and a pulley (5); the pulley (5) is limited on the annular track (4) and can slide along the annular track (4); the pulley (5) is connected to the U-shaped liquid column damper (10) of the damping system via the pulley frame (15), thereby enabling the U-shaped liquid column damper (10) to slide on the annular track (4) via the pulley (5); The transverse-torsion coupling mechanism comprises a torsion spring support (2), a torsion spring (3), a rotating rod (7), and a damper bracket (9); the torsion spring support (2) is fixed on the structure; the torsion spring (3) has its lower end fixed to the torsion spring support (3), and its upper end fixed to the bottom of the annular track (4); the rotating rod (7) has its lower end fixed to the bottom of the annular track (4), and its upper end is connected and fixed to the damper bracket (9); the damper bracket (9) is connected to the center of the bottom of the U-shaped liquid damper; The adaptive control system comprises a processing and control center (1), an accelerometer (14), an anemometer (16), and a liquid level meter (17); the accelerometer (14) and anemometer (16) are mounted on the structure; the liquid level meter (17) is mounted on the bottom of the U-shaped liquid damper (10); the input of the processing and control center 1 is electrically connected to the accelerometer (14) and the anemometer (16), receives signals from the accelerometer (14), the anemometer (16), and the liquid level meter (17), and determines the main vibration direction in the plane of the structure and adjusts the damping in real time; The self-powered part includes a piezoelectric ceramic (6) and a variable current power supply (13), wherein the piezoelectric ceramic (6) is connected to the variable current power supply (13), and the variable current power supply (13) is connected to the processing and control center (1) and the excitation coil (12) of the damping system; the piezoelectric ceramic (6) is arranged on the surface of the annular track (4), and the piezoelectric ceramic (6) converts mechanical energy into electrical energy after being compressed, and stores it in the variable current power supply (13), and the variable current power supply (13) supplies power to the processing and control center (1) and the excitation coil (12).

2. The self-powered rotary torsion-translation coupled adaptive liquid damper according to claim 1, characterized in that: There are two groups of pulley frames (15) and pulleys (5), which are respectively located at two ends of the bottom of the U-shaped liquid column damper (10) of the damping system.

3. The self-powered rotary torsion-translation coupled adaptive liquid damper according to claim 1, characterized in that: The pulley (5) and the pulley frame (15) are connected by bolt penetration, and the U-shaped liquid column damper (10) is fixed to the pulley frame (15) by bolt connection.

4. The self-powered rotary torsion-translation coupled adaptive liquid damper according to claim 1, characterized in that: The rotating rod (7) is driven by a stepping motor; The processing and control center 1 comprises a motor control module, and the motor control module is used to control a stepper motor to drive a rotating rod (7) of a translational torsion coupling mechanism.

5. The self-powered rotary torsion-translation coupled adaptive liquid damper according to claim 1, characterized in that: The accelerometer (14) and the anemometer (16) are installed in both directions of the structure X and Y; and the liquid level meter (17) is installed at both ends of the bottom of the U-shaped liquid damper (10).

6. The self-powered rotary translation-torsion coupled adaptive liquid damper according to claim 1, characterized in that: Realize three-level regulation: First-level control: the processing and control center (1) receives signals from the accelerometer (14) and the anemometer (16) to determine the main vibration direction in the structural plane; then, by controlling the rotation of the rotating rod (7), the U-shaped liquid column damper (10) is driven to rotate to the main vibration direction in the structural plane, thereby achieving preliminary control of the main vibration direction of the structure; Second-level regulation: the processing and control center (1) determines the internal liquid state of the U-shaped liquid column damper according to the signal of the liquid level meter (17), and uses the variable current power supply (13) to change the current of the excitation coil (12), thereby adjusting the liquid damping inside the U-shaped liquid column damper in real time to achieve more optimized energy dissipation and vibration reduction performance; Third-level regulation: The U-shaped liquid column damper (10) uses the torsion spring (3) to further reduce the torsion of the structure, thereby improving the vibration control performance of the U-shaped liquid column high damper, thereby ultimately achieving adaptive transverse torsion coupling control.

7. The self-powered rotary torsion-translation coupled adaptive liquid damper according to claim 6, characterized in that: The second level of regulation: The liquid level in the U-shaped liquid column damper (10) is determined in real time by a liquid level meter (17). When the difference between the liquid level and the equilibrium position increases, it is far from the equilibrium position. On the contrary, it is returning to the equilibrium position. When the magnetorheological fluid (11) in the damper shakes in a direction away from the equilibrium position, the current flowing into the excitation coil (12) is reduced, that is, the damping is reduced; When the magnetorheological fluid (11) in the damper shakes in a direction returning to a balanced position, the current flowing into the excitation coil (12) is increased, thereby increasing the damping; The structural translational response is reduced by shaking the magnetorheological fluid (11) in the U-shaped liquid column damper (10) along the main direction of in-plane vibration.

8. The self-powered rotary translation-torsion coupled adaptive liquid damper according to claim 6, characterized in that: The third level regulation: The torsion spring (3) enables the U-shaped liquid column damper to provide a reverse torque under the action of an external torque, so as to control the torsion of the structure and realize the function of reducing the torsion of the structure; and the torsion stiffness of the torsion spring (3) is adjusted to tune its anti-torsion frequency to be consistent with the torsion frequency of the structure, so as to realize the torsion response control of the structure.

9. The self-powered rotary translation-torsion coupled adaptive liquid damper according to claim 1, characterized in that: The thickness of the magnetic isolation net (8) is 3 cm to 10 cm.

10. The self-powered rotary translation-torsion coupled adaptive liquid damper according to claim 1, characterized in that: A gap of 5 mm to 1.5 cm is left between the pulley frame (15) and the annular track (4).

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