Self-powered Rotary Flat-Torsion Coupled Adaptive Liquid Damper

Abstract

The present invention provides a self-powered rotary translational-torsional coupled adaptive liquid damper, which includes a damping system, a sliding rail system, a translational-torsional coupling mechanism, an adaptive control system, and a self-power supply part. Among them: the damping system includes a U-shaped liquid column damper, magnetorheological fluid, an excitation coil, and a magnetic isolation net; the sliding rail system includes an annular track, a pulley frame, and pulleys; the translational-torsional coupling mechanism includes a torsional spring support, a torsional spring, a rotating rod, and a damper support; the adaptive control system includes a processing and control center, an accelerometer, an anemometer, and a liquid level gauge; the self-power supply part includes a piezoelectric ceramic and a variable current power supply. The present invention can simultaneously control the translational response and torsional response of the structure, achieve adaptive translational-torsional coupling control, improve the wind vibration control performance, and ensure the comfort and safety of the structure. In addition, the present invention uses a piezoelectric ceramic to convert mechanical energy into electrical energy for self-power supply, ensuring the vibration control effect of the damper in extreme cases.

Description

Technical Field

[0001] The present invention belongs to the technical fields of civil engineering and vibration control, and particularly relates to a self-powered rotary planar-torsional coupled adaptive liquid damper. Background Art

[0002] For high-rise and super high-rise buildings and long-span bridges, wind loads are the main culprit leading to the reduction of structural stability and comfort. In the early stage, the influence of wind vibration was resisted by strengthening the structure itself. In 1960, Kabori and Minai proposed the concept of wind vibration control. Compared with strengthening the structure itself, introducing an additional control system in the structure for wind vibration control 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 the wind vibration control is active control, active tuned mass dampers and active mass dampers are usually adopted; when the wind vibration control is semi-active control, active variable stiffness systems and active variable damping systems are usually adopted; when the wind vibration control is passive control, energy dissipation elements are usually set to achieve the control effect.

[0003] A tuned liquid column damper is usually a U-shaped rectangular water tank filled with liquid. By adjusting the liquid length, the frequency of the damper is made close to the frequency of the controlled object. During vibration, energy dissipation is achieved by relying on the liquid head loss caused by the liquid motion and the viscous action in the boundary layer. Generally, a tuned liquid column damper can only control the vibration response of the structure in a single direction and cannot adjust the parameters of the damper itself in real time. Even if the parameters of the damper itself can be adjusted in real time, the power supply stability cannot be maintained in extreme cases.

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

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a self-powered rotary translational-torsional coupled adaptive liquid damper, which can adjust its main vibration direction and damping in real time, control the translational response and torsion of the structure, and can also achieve self-power supply in extreme environments, having better adaptability and vibration control effect compared with traditional tuned liquid dampers.

[0006] The object of the present invention is achieved through the following technical solutions:

[0007] The self-powered rotary translational-torsional coupled adaptive liquid damper includes a damping system, a slide rail system, a translational-torsional coupling mechanism, an adaptive control system, and a self-power supply part, where:

[0008] The damping system includes a U-shaped liquid column damper 10, 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 arranged outside the vertical section of the U-shaped liquid column damper 10. 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;

[0009] The slide rail system includes an annular track 4, a pulley frame 15, and pulleys 5. The pulleys 5 are limited on the annular track 4 and can slide along the annular track 4. The pulleys 5 are connected to the U-shaped liquid column damper 10 of the damping system through the pulley frame 15, so as to realize the sliding of the U-shaped liquid column damper 10 on the annular track 4 through the pulleys 5;

[0010] The translational-torsional coupling mechanism includes a torsion spring support 2, a torsion spring 3, a rotating rod 7, and a damper support 9. The torsion spring support 2 is fixed on the structure; the torsion spring 3, its lower end is fixed to the torsion spring support 2, and its upper end is fixed to the bottom of the annular track 4; the rotating rod 7, its lower end is fixed to the bottom of the annular track 4, and its upper end is connected and fixed to the damper support 9; the damper support 9 is connected to the center of the bottom of the U-shaped liquid column damper;

[0011] The adaptive control system includes a processing and control center 1, an accelerometer 14, an anemometer 16, and a liquid level gauge 17. The accelerometer 14 and the anemometer 16 are installed on the structure; the liquid level gauge 17 is installed at the bottom of the U-shaped liquid column damper 10; the input of the processing and control center 1 is electrically connected to the accelerometer 14 and the anemometer 16, receives the signals of the accelerometer 14, the anemometer 16, and the liquid level gauge 17, and determines the main vibration direction in the plane of the structure and adjusts the damping in real time;

[0012] The self-power supply 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 pressed, the piezoelectric ceramic 6 converts mechanical energy into electrical energy 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.

[0013] Due to the above scheme, the present invention has the following beneficial effects:

[0014] First, the adaptive liquid damper of the present invention can rotate along the annular track to ensure the best main vibration direction, so as to improve the vibration control effect of the damper.

[0015] Second, the adaptive liquid damper of the present invention can realize the coupled control of structural translation and torsion, and has better stability compared with traditional liquid dampers.

[0016] Third, the adaptive liquid damper of the present invention can change its own damping. Compared with traditional liquid dampers with unchangeable damping, the present invention has better vibration damping performance.

[0017] Fourth, the adaptive liquid damper of the present invention can convert mechanical energy into electrical energy by using piezoelectric ceramics for self-power supply, ensuring the vibration control effect of the damper in extreme cases. Description of the Drawings

[0018] Figure 1 It is the main structural view of the self-powered rotary translational-torsional coupled adaptive liquid damper of the present invention.

[0019] Figure 2 is Figure 1 the top view of.

[0020] Figure 3 It is the control flow chart of the self-powered rotary translational-torsional coupled adaptive liquid damper of the present invention.

[0021] Figure 4 is Figure 3 the switching of the magnetorheological fluid inside the damper between two states of being far from / at equilibrium: (a) is the schematic diagram of the magnetorheological fluid inside the damper being far from the equilibrium position, and (b) is the schematic diagram of the magnetorheological fluid inside the damper returning to the equilibrium position.

[0022] Reference Signs:

[0023] Processing and control center 1, torsion spring support 2, torsion spring 3, annular track 4, pulley 5, piezoelectric ceramic 6, rotating rod 7, magnetic shielding net 8, damper support 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 gauge 17. Specific implementation mode

[0024] The technical solution provided by the present application will be further described below in conjunction with specific embodiments and their accompanying drawings. In combination with the following description, the advantages and features of the present application will be clearer.

[0025] The self-powered rotary planar-torsional coupled adaptive liquid damper includes a damping system, a slide rail system, a planar-torsional coupling mechanism, an adaptive control system, and a self-powered part, wherein:

[0026] The damping system includes a U-shaped liquid column damper 10, a magnetorheological fluid 11, an excitation coil 12, and a magnetic shielding 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 outer side of the vertical section of the U-shaped liquid column damper 10 by bolt connection or sleeve connection. The magnetic shielding net 8 is arranged on the inner sides of the horizontal section and part of the vertical section of the U-shaped liquid column damper 10.

[0027] Preferably, the material of the magnetic shielding net 8 can be magnetic shielding materials such as ferrite and graphite; the thickness of the magnetic shielding net 8 is 3 cm to 10 cm.

[0028] 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, there are two groups of the pulley frame 15 and the pulley 5, which are respectively located at both 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 bolt perforation, and the U-shaped liquid column damper 10 is fixed to the pulley frame 15 by bolt connection.

[0029] Preferably, a gap of 5 mm to 1.5 cm should be left between the pulley frame 15 and the annular track 4.

[0030] The planar-torsional coupling mechanism includes a torsional spring support 2, a torsional spring 3, a rotating rod 7, and a damper support 9. The torsional spring support 2 is fixedly connected to a structure (not shown in the figure) by welding; for the torsional spring 3, its lower end is fixedly connected to the torsional spring support 2 by snap connection, and its upper end is fixedly connected to the bottom of the annular track 4 by snap connection; for the rotating rod 7, its lower end is fixedly connected to the bottom of the annular track 4 by bolt connection, and its upper end is fixedly connected to the damper support 9 by bolt connection; the damper support 9 is connected to the center of the bottom of the U-shaped liquid column damper by bolt connection. Further, the rotating rod 7 is driven by a stepper motor (not shown in the figure).

[0031] The adaptive control system includes a processing and control center 1, an accelerometer 14, an anemometer 16, and a liquid level gauge 17. The accelerometer 14 and the anemometer 16 are installed on a structure (not shown in the figure); the liquid level gauge 17 is installed at the bottom of the U-shaped liquid column damper 10; the input of the processing and control center 1 is electrically connected to the accelerometer 14 and the anemometer 16, and receives the signals of the accelerometer 14, the anemometer 16, and the liquid level gauge 17 to determine the main direction of vibration in the plane of the structure and adjust the damping in real time.

[0032] Further, the processing and control center 1 includes a motor control module, and the motor control module is used to control a stepper motor (not shown in the figure) to drive the rotating rod 7 of the planar-torsional coupling mechanism.

[0033] Further, the accelerometer 14 and the anemometer 16 are installed in both the X and Y directions of the structure; the liquid level gauges 17 are installed at both ends of the bottom of the U-shaped liquid column damper 10.

[0034] The self-power supply 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 pressed, the piezoelectric ceramic 6 converts mechanical energy into electrical energy 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.

[0035] Based on the above structure, the present invention can achieve three-level regulation:

[0036] The first-level regulation: The processing and control center 1 receives the signals of the accelerometer 14 and the anemometer 16 to determine the main direction of vibration in the plane of the structure; then, by controlling the rotation of the rotating rod 7, the U-shaped liquid column damper 10 is driven to rotate to the main direction of vibration in the plane of the structure to achieve the preliminary control of the main direction of vibration of the structure.

[0037] Secondary-level regulation: The processing and control center 1 can judge the internal liquid state of the U-shaped liquid column damper according to the signal of the liquid level gauge 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, so as to achieve more optimized energy dissipation and vibration reduction performance;

[0038] Tertiary-level 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-damping damper, so as to finally achieve adaptive planar-torsional coupling control.

[0039] The present invention also uses the piezoelectric ceramics 6 in the annular track 4 to convert mechanical energy into electrical energy after being pressed, so as to supply power to the processing and control center 1 and the excitation coil 12, ensuring the vibration control effect and power supply reliability of the U-shaped liquid column damper in extreme cases.

[0040] The planar-torsional 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-power supply part can minimize the power consumption of the damper. The cooperative control of the above-mentioned parts optimizes the self-power supply and adaptive control performance of the damper.

[0041] Specifically, as Figure 2 、 Figure 3 shown, primary-level regulation:

[0042] Specifically, the wind direction and wind speed of a typhoon are uncertain, and the wind attack angle of the structure by each typhoon is different, resulting in different vibration responses and torsional responses of the structure in the X and Y directions in the plane. The accelerometers 14 and the anemometers 16 installed in the X and Y directions of the structure can respectively measure the vibration acceleration response signals a x (t), a y (t) of the structure in the X and Y directions and the wind speed signal of the typhoon. The processing and control center 1 vectorially superimposes the signals of the anemometer and the accelerometer, and calculates the wind attack angle of this typhoon, that is, the main vibration direction D of the structure (the angle with the X-axis is ), and controls the rotation of the rotating rod 7 through the stepper 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 structure vibration control effect.

[0043] Specifically, as Figure 4 shown, secondary-level regulation:

[0044] The typhoon excitation is a stationary random process. The wind loads at different times are different, and the optimal damping coefficients of the tuned liquid column damper are also different. In the present invention, the tuned liquid column damper is a U-shaped liquid column damper. A magnetorheological fluid 11 is contained in the U-shaped liquid column damper 10, and its damping characteristics are related to the electric current passing through. Specifically, the material density of the magnetorheological fluid 11 is related to the electric current passing through. The greater the electric current passing through, 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 an electric wire. The variable current power supply 13 is connected to the excitation coil 12 through an electric wire. The excitation coil 12 inputs the current into the magnetorheological fluid 11 through direct contact.

[0045] In order to improve the instantaneous vibration reduction performance of the U-shaped liquid column damper, the processing and control center 1 controls the variable current power supply 13 to change the current passing through the excitation coil 12, so as to change the magnitude of the current passing into the magnetorheological fluid 11, thereby adjusting the material density and damping of the magnetorheological fluid in real time and realizing the real-time adjustment of the damping. Specifically:

[0046] The liquid level height in the U-shaped liquid column damper is judged in real time through the liquid level gauge 17. When the gap between the liquid level height and the equilibrium position increases, that is, when it is far from the equilibrium position, otherwise it is when returning to the equilibrium position;

[0047] When the shaking direction of the magnetorheological fluid 11 in the damper is away from the equilibrium position, the current passing through the excitation coil 12 is reduced, that is, the damping is reduced;

[0048] When the shaking direction of the magnetorheological fluid 11 in the damper is returning to the equilibrium position, the current passing through the excitation coil 12 is increased, that is, the damping is increased;

[0049] 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 vibration in the plane.

[0050] The third-level regulation:

[0051] The U-shaped liquid column damper provides a reverse torque under the action of an 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. By adjusting the torsional stiffness of the torsion spring 3, the torsional frequency is tuned to be consistent with the torsional frequency of the structure, so as to realize the control of the torsional response of the structure.

[0052] In summary, the present invention can simultaneously control the translational response and torsional response of the structure, realize the adaptive translational-torsional coupling control, improve the wind vibration control performance, and ensure the comfort and safety of the structure.

[0053] The above description is only for the description of the preferred embodiments of the present invention, and is not any limitation on the scope of the present invention. Any modification or variation made by any person skilled in the art based on the technical content disclosed above shall be regarded as an equivalent effective embodiment, and all fall within the scope of protection of the technical solution of the present invention.

Claims

1. Self-powered rotary flat-torsion coupled adaptive liquid damper, characterized in that, It includes a damping system, a slide rail system, a planar-torsional coupling mechanism, an adaptive control system, and a self-power supply part, where: The damping system includes a U-shaped liquid column damper (10), 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 arranged on the outer side of the vertical section of the U-shaped liquid column damper (10). The magnetic isolation net (8) is arranged on the inner side of 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 pulleys (5). The pulleys (5) are limited on the annular track (4) and can slide along the annular track (4). The pulleys (5) are 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 pulleys (5); The planar-torsional coupling mechanism includes a torsion spring support (2), a torsion spring (3), a rotating rod (7), and a damper support (9). The torsion spring support (2) is fixed to the structure; the torsion spring (3), its lower end is fixed to the torsion spring support (2), and its upper end is fixed to the bottom of the annular track (4); the rotating rod (7), its lower end is fixed to the bottom of the annular track (4), and its upper end is connected and fixed to the damper support (9); the damper support (9) is connected to the center of the bottom of the U-shaped liquid column damper; The adaptive control system includes a processing and control center (1), an accelerometer (14), an anemometer (16), and a liquid level gauge (17). The accelerometer (14) and the anemometer (16) are installed on the structure; the liquid level gauge (17) is installed at the bottom of the U-shaped liquid column damper (10); the input of the processing and control center 1 is electrically connected to the accelerometer (14) and the anemometer (16), receives the signals of the accelerometer (14), the anemometer (16), and the liquid level gauge (17), and determines the main direction of vibration in the structural plane and adjusts the damping in real time; The self-power supply 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). 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 annular track (4). After being pressed, 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).

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

3. The self-powered rotary planar torsion-coupled adaptive liquid damper according to claim 1, wherein The pulleys (5) and the pulley frames (15) are connected by bolt perforation, and the U-shaped liquid column damper (10) is fixed to the pulley frame (15) by bolts.

4. The self-powered rotary planar torsion-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) includes a motor control module, and the motor control module is used to control the rotating rod (7) of the stepping motor driving the planar-torsional coupling mechanism.

5. The self-powered rotary flat-torsion coupled adaptive liquid damper according to claim 1, wherein The accelerometers (14) and anemometers (16) are installed in both the X and Y directions of the structure; the liquid level gauges (17) are installed at both ends of the bottom of the U-shaped liquid column damper (10).

6. The self-powered rotary flat-torsion coupled adaptive liquid damper according to claim 1, wherein Three-level regulation is achieved: First-level regulation: The processing and control center (1) receives the signals from the accelerometers (14) and anemometers (16) to determine the main vibration direction in the plane of the structure; 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 plane of the structure to achieve the preliminary control of the main vibration direction of the structure. Second-level regulation: The processing and control center (1) judges the internal liquid state of the U-shaped liquid column damper according to the signal of the liquid level gauge (17), and uses 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 better 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 and improve the vibration control performance of the U-shaped high-damping liquid column damper, so as to finally achieve adaptive planar-torsional coupling control.

7. The self-powered rotary flat-torsion coupled adaptive liquid damper according to claim 6, characterized in that, The second-level regulation: The liquid level gauge (17) is used to judge the liquid level height in the U-shaped liquid column damper (10) in real time. When the gap between the liquid level height and the equilibrium position increases, that is, when it is far from the equilibrium position, and vice versa when it returns to the equilibrium position; When the shaking direction of the magnetorheological fluid (11) in the damper is away from the equilibrium position, the current applied to the excitation coil (12) is reduced, that is, the damping is reduced; When the shaking direction of the magnetorheological fluid (11) in the damper is returning to the equilibrium position, the current applied to 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 vibration direction in the plane.

8. The self-powered rotary planar torsion-coupled adaptive liquid damper according to claim 6, wherein, 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 to control the torsion of the structure and achieve the function of reducing the torsion of the structure; by adjusting the torsional stiffness of the torsion spring (3), the anti-torsion frequency is tuned to be consistent with the torsional frequency of the structure to achieve the control of the torsional response of the structure.

9. The self-powered rotary flat-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 flat-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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