A semi-active liquid damper system with variable frequency and damping

Abstract

The present invention provides a semi-active liquid damper system with variable frequency and damping, comprising: a U-shaped tuned liquid column damper, a rectangular tuned liquid damper, a pipeline connecting the U-shaped tuned liquid column damper and the rectangular tuned liquid damper, a liquid level gauge, a flow velocity gauge, a displacement gauge and a microcontroller. The semi-active liquid damper system with variable frequency and damping provided by the present invention can adjust the frequency and damping ratio of the U-shaped tuned liquid column damper and the rectangular tuned liquid damper in the system in real time, and has better energy dissipation and shock absorption performance in a wider frequency band and better real-time vibration control performance compared with traditional liquid dampers.

Description

Technical Field

[0001] The present invention belongs to the technical fields of civil engineering and vibration control, and particularly relates to a semi-active liquid damper system with variable frequency and damping. Background Art

[0002] With the progress and development of construction technologies, building structures are becoming increasingly tall. Along with their characteristics of flexibility and small damping ratio, building structures generate large displacements and accelerations under the influence of multiple disasters, affecting the safety of the structure and the comfort of indoor users. Therefore, how to perform intelligent disaster prevention and mitigation control of structures under the coupling action of multiple disasters has become a very crucial issue in the design of high-rise and even super-high-rise buildings.

[0003] A tuned liquid damper is a passive energy dissipation vibration reduction device that provides vibration reduction by utilizing the dynamic lateral force generated by the liquid in a fixed water tank during the sloshing process. However, due to its structural characteristics, only part of the liquid in the water tank participates in the vibration, and the frequency and damping are not adjustable, which has certain limitations in structural vibration reduction.

[0004] A tuned liquid column damper is a building structure vibration control device with low cost, easy installation, adjustable frequency, and simple maintenance. During use, the lower part of a U-shaped cross-section tubular rigid water tank is fixed to the structure. When the structure vibrates due to external load, it drives the water body inside the tuned liquid column damper to reciprocate. During the reciprocating movement of the water body, it frequently flows through the water holes to generate damping force, dissipating the vibration energy of the structure and reducing the vibration of the structure. At the same time, the movement of the water body generates an inertial force opposite to the vibration direction of the structure, further reducing the vibration of the structure. The control effect of traditional tuned liquid column dampers is sensitive to their own parameters, and their broadband energy dissipation and vibration reduction effect on building structures are not good, and the control effect on multiple disasters such as the coupling of wind and earthquake is also not satisfactory. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a semi-active liquid damper system with variable frequency and damping, which can adjust the frequency and damping ratio of the U-shaped tuned liquid column damper and the rectangular tuned liquid damper in the system in real time, and has better broadband energy dissipation and vibration reduction performance and better real-time vibration control performance compared with traditional liquid dampers.

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

[0007] A semi-active liquid damper system with variable frequency and damping includes: a U-shaped tuned liquid column damper, a rectangular tuned liquid damper, a pipeline connecting the U-shaped tuned liquid column damper and the rectangular tuned liquid damper, a liquid level gauge, a flow velocity gauge, a displacement gauge, and a microcontroller.

[0008] The U-shaped tuned liquid column damper has a horizontal pipe section, a first vertical pipe section, and a second vertical pipe section. The first vertical pipe section and the second vertical pipe section are respectively located at both ends of the horizontal pipe section and communicate with the horizontal pipe section respectively. A magnetorheological damper is provided in the horizontal pipe section. The magnetorheological damper includes: a sealed cylinder and a movable rod arranged along the central axis of the sealed cylinder. A metal hollow cylinder is wrapped outside the movable rod. An exciting coil is wound around the outside of the metal hollow cylinder. The exciting coil is connected to an external power supply wire by the movable rod. Magnetorheological fluid is stored in the sealed cylinder. One end of the movable rod extends from one end of the sealed cylinder to the outside of the sealed cylinder and is connected to a first piston through a fixing screw. A guiding device is provided at the other end of the movable rod. The translation direction of the movable rod is determined by the guiding device. A second piston is connected to the other end of the sealed cylinder by welding or bolts, so that the first piston and the second piston can translate along the horizontal pipe section as the movable rod moves and always keep separating and sealing the liquid columns on both sides of the horizontal pipe section.

[0009] The rectangular tuned liquid damper includes: a replaceable perforated grille, a stepper telescopic rod, and a stepper motor. The stepper motor controls the movement of the stepper telescopic rod to change the contact area between the replaceable perforated grille and the liquid.

[0010] The pipeline includes: a first pipeline that unidirectionally connects the U-shaped tuned liquid column damper and the rectangular tuned liquid damper. The first pipeline pumps liquid from the rectangular tuned liquid damper into the U-shaped tuned liquid column damper through a water pump; and a second pipeline that unidirectionally connects the U-shaped tuned liquid column damper and the rectangular tuned liquid damper. The second pipeline discharges liquid from the U-shaped tuned liquid column damper into the rectangular tuned liquid damper under the control of a solenoid valve.

[0011] The liquid level gauge includes at least three liquid level gauges for measuring the total length of the water center line in the tuned liquid column damper in real time. The three liquid level gauges are respectively arranged at the bottom of the first vertical pipe section of the U-shaped tuned liquid column damper, the bottom of the second vertical pipe section of the U-shaped tuned liquid column damper, and the bottom of the rectangular tuned liquid damper.

[0012] The flow meter is arranged in the U-shaped tuned liquid column damper for measuring the flow velocity of the water center line in the tuned liquid column damper in real time.

[0013] The displacement meter is fixed to the building structure by bolts for measuring the displacement of the building structure.

[0014] The microcontroller is used to receive the signals of the displacement meter and the sensing system. After being analyzed and processed by the built-in algorithm, it controls the drive system to adjust the frequency and damping ratio of the semi-active liquid damper system.

[0015] The liquid level gauge and the flow velocity gauge constitute the sensing system of the semi-active liquid damper system.

[0016] The solenoid valve, the water pump, the first pipeline, the second pipeline, the stepping motor, and the stepping telescopic rod constitute the drive system of the semi-active liquid damper. By driving the solenoid valve, the water pump, the first pipeline, and the second pipeline, the water volume in the U-shaped tuned liquid column damper is automatically and real-time adjusted to change the total length of the water center line so as to retune the natural vibration frequency.

[0017] The magnetorheological damper and the replaceable perforated grille constitute the damping system of the semi-active liquid damper. By changing the energization amount and magnetic flux of the magnetorheological fluid of the magnetorheological damper to change its viscosity to change the damping of the U-shaped tuned liquid column damper, and by changing the contact area between the replaceable perforated grille and the liquid to change the damping of the rectangular tuned liquid damper.

[0018] Wherein, the part where the movable rod extends out of the sealing cylinder is sealed by a seal.

[0019] Wherein, the outside of the excitation coil is coated with a wear-resistant layer; preferably, the thickness range of the wear-resistant layer is 5 cm to 10 cm.

[0020] Furthermore, the rectangular tuned liquid damper is further provided with a grille frame, and the replaceable perforated grille is connected to the grille frame. Wherein, the number of the replaceable perforated grilles can be 3 to 8 to form a grille group.

[0021] Furthermore, the stepping telescopic rod includes a stepping telescopic upper rod, which is fixedly connected to the upper end of the grille frame by bolts, and the stepping telescopic upper rod drives the grille frame to move up and down under the control of the stepping motor. The stepping telescopic rod may further include a stepping telescopic lower rod, which is fixedly connected to the lower end of the grille frame by bolts, and the replaceable perforated grille is connected to the lower end of the stepping telescopic lower rod by fixing bolts, and the stepping telescopic lower rod drives the replaceable perforated grille to move up and down under the control of the stepping motor.

[0022] Wherein, the adjustable length range of the stepping telescopic rod is 0 to 3 m.

[0023] The variable-frequency and variable-damping semi-active liquid damper system proposed by the present invention, the U-shaped tuned liquid column damper and the rectangular tuned liquid damper are in two-way communication through the first pipeline and the second pipeline. The water volume in the U-shaped tuned liquid column damper can be automatically and real-time adjusted through the solenoid valve, water pump and water pipe in the drive system to change the total length of the water center line to retune the natural vibration frequency. At the same time, the magnetorheological damper is used to change the damping in order to improve the vibration control effect on the structure; the stepping motor and the stepping telescopic rod in the drive system change the contact area between the grille group and the liquid in the rectangular tuned liquid damper in order to improve the vibration control effect on the structure at the same time.

[0024] For the variable-frequency and variable-damping semi-active liquid damper system proposed by the present invention, due to the adoption of the above scheme, the beneficial effects of the present invention are as follows:

[0025] First, the semi-active liquid damper system of the present invention can change the frequency of the damper itself. Compared with the traditional tuned liquid damper with non-adjustable frequency, it has stronger adaptability.

[0026] Second, the semi-active liquid damper system of the present invention can change the damping ratio of the damper itself. Compared with the traditional tuned liquid column damper with non-variable damping, it can transfer the vibration energy of the building structure to itself and dissipate it to the greatest extent to achieve the effect of energy dissipation and shock absorption.

[0027] Third, the semi-active liquid damper system of the present invention jointly controls the vibration by the U-shaped tuned liquid column damper and the rectangular tuned liquid damper to achieve the best control effect. Brief Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the variable-frequency and variable-damping semi-active liquid damper system of the present invention.

[0029] Figure 2 It is a side view of the rectangular tuned liquid damper part of the variable-frequency and variable-damping semi-active liquid damper system of the present invention.

[0030] Figure 3 It is a semi-active control flow chart of the variable-frequency and variable-damping semi-active liquid damper system of the present invention.

[0031] Reference numerals: 1 - U-shaped tuned liquid column damper, 100 - horizontal pipe section, 101 - first vertical pipe section, 102 - second vertical pipe section, 2 - magnetorheological damper, 3 - water pump, 4 - solenoid valve, 51 - first pipe, 52 - second pipe, 6 - replaceable perforated grille, 7 - stepper telescopic rod, 8 - rectangular tuned liquid damper, 9 - liquid level gauge, 10 - fixing screw, 11 - piston, 12 - guiding device, 13 - movable rod, 14 - seal, 15 - external power supply wire, 16 - magnetorheological fluid, 17 - wear-resistant layer, 18 - excitation coil, 19 - sealing cylinder, 20 - metal hollow cylinder, 21 - flow meter, 22 - fixing bolt, 23 - grille frame, 24 - stepper motor, 25 - microcontroller and 26 - displacement gauge. Detailed implementation mode

[0032] The present invention will be further described below in conjunction with the drawings and embodiments, but the embodiments are not used to limit the present invention. Any similar structures and their similar changes of the present invention should be included in the protection scope of the present invention.

[0033] As Figure 1 shown, the variable-frequency and variable-damping semi-active liquid damper system proposed by the present invention includes: a U-shaped tuned liquid column damper 1, a rectangular tuned liquid damper 8, a first pipe 51 and a second pipe 52 connecting the U-shaped tuned liquid column damper 1 and the rectangular tuned liquid damper 8, three liquid level gauges 9, a flow meter 21, a displacement gauge 26 and a microcontroller 25.

[0034] The U-shaped tuned liquid column damper 1 has a horizontal pipe section 100, a first vertical pipe section 101 and a second vertical pipe section 102. The first vertical pipe section 101 and the second vertical pipe section 102 are respectively located at both ends of the horizontal pipe section 100 and are each communicated with the horizontal pipe section 100. A magnetorheological damper 2 is provided in the horizontal pipe section 100. The magnetorheological damper 2 includes: a sealing cylinder 19 and a movable rod 13 arranged along the central axis of the sealing cylinder 19. A metal hollow cylinder 20 is wrapped outside the movable rod 13. An excitation coil 18 is wound around the outside of the metal hollow cylinder 20. A wear-resistant layer 17 is coated on the outside of the excitation coil 18. Preferably, the thickness range of the wear-resistant layer 17 is 5 cm to 10 cm. The excitation coil 18 is connected to the external power supply wire 15 by the movable rod 13. Magnetorheological fluid 16 is stored in the sealing cylinder 19. One end of the movable rod 13 extends from one end of the sealing cylinder 19 to the outside of the sealing cylinder 19 and is connected to the piston 11 by a fixing screw 10. A guiding device 12 is provided at the other end of the movable rod 13. The movable rod 13 is determined the translation direction by the guiding device 12. Another piston 11 is connected to the other end of the sealing cylinder 19 by welding or bolts. The two pistons 11 can translate along the horizontal pipe section 100 with the movement of the movable rod 13 and always keep separating and sealing the liquid columns on both sides of the horizontal pipe section 100. Among them, the movable rod 13 is sealed by a seal 14 at the place where it extends out of the sealing cylinder 19.

[0035] The rectangular tuned liquid damper 8 includes: a replaceable perforated grille 6, a grille frame 23, a step-type telescopic rod 7, and a stepper motor 24. The upper and lower ends of the grille frame 23 are each provided with a step-type telescopic rod 7. The replaceable perforated grille 6 is connected to the grille frame 23 through the step-type telescopic rod 7 provided at the lower end of the grille frame 23. The stepper motor 24 controls the movement of the step-type telescopic rod 7 at the upper end and / or the lower end, thereby driving the replaceable perforated grille 6 to move up and down, and further changing the contact area between the replaceable perforated grille 6 and the liquid.

[0036] The first pipeline 51 and the second pipeline 52 are respectively in one-way communication with the U-shaped tuned liquid column damper 1 and the rectangular tuned liquid damper 8. Among them, the first pipeline 51 pumps the liquid from the rectangular tuned liquid damper 8 into the U-shaped tuned liquid column damper 1 through the water pump 3, and the second pipeline 52 discharges the liquid from the U-shaped tuned liquid column damper 1 into the rectangular tuned liquid damper 8 under the control of the solenoid valve 4.

[0037] Three liquid level gauges 9 are used to measure the total length of the water center line in the tuned liquid column damper in real time, and are respectively arranged at the bottom of the first vertical pipe section 101 of the U-shaped tuned liquid column damper 1, the bottom of the second vertical pipe section 102 of the U-shaped tuned liquid column damper 1, and the bottom of the rectangular tuned liquid damper 8.

[0038] The flow velocity meter 21 is arranged in the U-shaped tuned liquid column damper 1 and is used to measure the flow velocity of the water center line in the tuned liquid column damper in real time. As Figure 1 shown, in this embodiment, the flow velocity meter 21 is arranged in the second vertical pipe section 102 of the U-shaped tuned liquid column damper 1 near the first pipeline 51 and the second pipeline 52 that connect the U-shaped tuned liquid column damper 1 and the rectangular tuned liquid damper 8.

[0039] The displacement meter 26 is fixed to the building structure by bolts and is used to measure the displacement of the building structure.

[0040] The microcontroller 25 is used to receive the signals of the displacement meter 26 and the sensing system, and after analysis and processing by the built-in algorithm, it controls the drive system to adjust the frequency and damping ratio of the semi-active liquid damper system.

[0041] Among them, the number of the replaceable perforated grilles 6 can be 3 to 8 to form a grille group, and the adjustable length range of the step-type telescopic rod 7 is 0 to 3 m.

[0042] U-shaped Tuned Liquid Column Damper Part

[0043] The U-shaped tuned liquid column damper part includes: a magnetorheological damper 2, a liquid level gauge 9, and a flow velocity meter 21. The magnetorheological damper 2 includes a piston 11, a guiding device 12, a movable rod 13, magnetorheological fluid 16, a wear-resistant layer 17, an excitation coil 18, a sealing cylinder 19, and a metal hollow cylinder 20. By changing the electric current and magnetic flux of the magnetorheological fluid 16 in the magnetorheological damper 2 to change its viscosity, the damping of the U-shaped tuned liquid column damper 1 is changed.

[0044] Rectangular Tuned Liquid Damper Part

[0045] The rectangular tuned liquid damper part includes: a rectangular tuned liquid damper 8, a replaceable perforated grille 6, a stepper telescopic rod 7, a liquid level gauge 9, a grille frame 23, and a stepper motor 24. By changing the contact area between the replaceable perforated grille 6 and the liquid inside the rectangular tuned liquid damper 8, the damping of the rectangular tuned liquid damper 8 is changed.

[0046] Sensing System

[0047] The sensing system includes: a liquid level gauge 9 and a flow velocity meter 21.

[0048] Drive System

[0049] The driving system includes: a solenoid valve 4, a water pump 3, a first pipeline 51, a second pipeline 52, a stepper motor 24, and a stepper telescopic rod 7. The first pipeline 51 and the second pipeline 52 are respectively unidirectionally connected to the U-shaped tuned liquid column damper 1 and the rectangular tuned liquid damper 8. Among them, the first pipeline 51 pumps the liquid from the rectangular tuned liquid damper 8 into the U-shaped tuned liquid column damper 1 through the water pump 3, and the second pipeline 52 discharges the liquid from the U-shaped tuned liquid column damper 1 into the rectangular tuned liquid damper 8 under the control of the solenoid valve 4. By driving the solenoid valve 4, the water pump 3, the first pipeline 51, and the second pipeline 52, the water volume in the U-shaped tuned liquid column damper 1 is automatically and real-time adjusted to change the total length of the water center line to retune the natural vibration frequency.

[0050] Damping System

[0051] The damping system includes: a magnetorheological damper 2 and a replaceable perforated grille 6. By changing the electric current and magnetic flux of the magnetorheological fluid 16 in the magnetorheological damper 2 to change its viscosity, the damping of the U-shaped tuned liquid column damper 1 is changed. By changing the contact area between the replaceable perforated grille 6 and the liquid, the damping of the rectangular tuned liquid damper 8 is changed.

[0052] Microcontroller

[0053] The microcontroller receives the signals from the displacement gauge 26 and the sensing system. After being analyzed and processed by the built-in algorithm, it controls the drive system to perform vibration control of the structure. The specific methods for data collection, transmission, processing and analysis do not belong to the technical problems to be solved by the present invention and are prior arts known to those skilled in the art, so they will not be elaborated herein.

[0054] The above description is only for the description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any change or modification made by any person skilled in the art according to the technical content disclosed above shall be regarded as equivalent effective embodiments and fall within the scope of protection of the technical solution of the present invention.

Claims

1. A semi-active liquid damper system with variable frequency and damping, characterized in that, Comprising: A U-shaped tuned liquid column damper (1), having a horizontal pipe section, a first vertical pipe section, and a second vertical pipe section. The first vertical pipe section and the second vertical pipe section are respectively located at both ends of the horizontal pipe section and are each communicated with the horizontal pipe section. A magnetorheological damper (2) is provided in the horizontal pipe section. The magnetorheological damper (2) includes: a sealing cylinder (19) and a movable rod (13) arranged along the central axis of the sealing cylinder (19). A metal hollow cylinder (20) is wrapped around the outside of the movable rod (13). An exciting coil (18) is wound around the outside of the metal hollow cylinder (20). The exciting coil (18) is connected to an external power supply wire (15) by means of the movable rod (13). Magnetorheological fluid (16) is stored in the sealing cylinder (19). One end of the movable rod (13) extends from one end of the sealing cylinder (19) to the outside of the sealing cylinder (19) and is connected to a first piston (11) by a fixing screw (10). A guiding device (12) is provided at the other end of the movable rod (13). The translational direction of the movable rod (13) is determined by the guiding device (12). A second piston (11) is connected to the other end of the sealing cylinder (19) by welding or bolts, so that the first piston (11) and the second piston (11) can translate along the horizontal pipe section as the movable rod (13) moves and always keep separating and sealing the liquid columns on both sides of the horizontal pipe section; A rectangular tuned liquid damper (8), including: a replaceable perforated grille (6), a step-type telescopic rod (7), and a stepping motor (24). The stepping motor (24) controls the movement of the step-type telescopic rod (7) to change the contact area between the replaceable perforated grille (6) and the liquid; A first pipeline (51) that unidirectionally communicates the U-shaped tuned liquid column damper (1) with the rectangular tuned liquid damper (8). The first pipeline (51) pumps liquid from the rectangular tuned liquid damper (8) into the U-shaped tuned liquid column damper (1) through a water pump (3); A second pipeline (52) that unidirectionally communicates the U-shaped tuned liquid column damper (1) with the rectangular tuned liquid damper (8). The second pipeline (52) discharges liquid from the U-shaped tuned liquid column damper (1) into the rectangular tuned liquid damper (8) under the control of a solenoid valve (4); Three liquid level gauges (9) for measuring the total length of the water center line in the tuned liquid column damper in real time. The three liquid level gauges (9) are respectively arranged at the bottom of the first vertical pipe section of the U-shaped tuned liquid column damper (1), the bottom of the second vertical pipe section of the U-shaped tuned liquid column damper (1), and the bottom of the rectangular tuned liquid damper (8); A flow velocity meter (21) arranged in the U-shaped tuned liquid column damper (1) for measuring the flow velocity of the water center line in the tuned liquid column damper in real time; A displacement meter (26) fixed to the building structure by bolts for measuring the displacement of the building structure; and A microcontroller (25) is configured to receive signals from the displacement gauge (26) and the sensing system, and after analyzing and processing them through built-in algorithms, control the drive system to adjust the frequency and damping ratio of the semi-active liquid damper system; Wherein: The liquid level gauge (9) and the flow meter (21) constitute the sensing system of the semi-active liquid damper system; The solenoid valve (4), the water pump (3), the first pipe (51), the second pipe (52), the stepper motor (24) and the stepper telescopic rod (7) constitute the drive system of the semi-active liquid damper. By driving the solenoid valve (4), the water pump (3), the first pipe (51) and the second pipe (52), the water volume in the U-shaped tuned liquid column damper is automatically and real-time adjusted to change the total length of the water center line to retune the natural vibration frequency; The magnetorheological damper (2) and the replaceable perforated grille (6) constitute the damping system of the semi-active liquid damper. By changing the electricity passing amount and magnetic flux of the magnetorheological fluid (16) of the magnetorheological damper (2) to change its viscosity, the damping of the U-shaped tuned liquid column damper (1) is changed. By changing the contact area between the replaceable perforated grille (6) and the liquid, the damping of the rectangular tuned liquid damper (8) is changed.

2. The semi-active liquid damper system according to claim 1, wherein: The portion where the movable rod (13) extends out of the sealing cylinder (19) is sealed by a seal (14).

3. The semi-active liquid damper system according to claim 1, characterized in that: The outside of the excitation coil (18) is coated with a wear-resistant layer (17).

4. The semi-active liquid damper system according to claim 3, wherein: The thickness range of the wear-resistant layer (17) is 5 cm to 10 cm.

5. The semi-active liquid damper system according to claim 1, characterized in that: The rectangular tuned liquid damper (8) is further provided with a grille frame (23), and the replaceable perforated grille (6) is connected to the grille frame (23).

6. The semi-active liquid damper system according to claim 1 or 5, characterized in that: The number of the replaceable perforated grilles (6) can be 3 to 8 to form a grille group.

7. The semi-active liquid damper system according to claim 5, characterized in that: The stepper telescopic rod (7) includes: A stepper telescopic upper rod, which is fixedly connected to the upper end of the grille frame (23) by bolts, and the stepper telescopic upper rod drives the grille frame (23) to move up and down under the control of the stepper motor (24); and / or A stepper telescopic lower rod, which is fixedly connected to the lower end of the grille frame (23) by bolts, and the replaceable perforated grille (6) is connected to the lower end of the stepper telescopic lower rod by fixing bolts (22). The stepper telescopic lower rod drives the replaceable perforated grille (6) to move up and down under the control of the stepper motor (24).

8. The semi-active liquid damper system according to claim 7, wherein: The adjustable length range of the stepper telescopic rod (7) is 0 to 3 m.

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