Damper capable of actively controlling damping force, damping system and damping system control method

Abstract

The invention provides a damper capable of actively controlling damping force, a damping system and a damping system control method. The damper comprises an oil cylinder body, a cylinder cover, a piston, a piston rod, a first connecting lug plate, a connecting body and a second connecting lug plate. When two structural units of a civil structure generate relative displacement under the action of an earthquake or other external forces, the piston and the oil cylinder body generate relative movement, and the relative movement between the piston and the oil cylinder body enables viscous oil in the first damping cavity and the second damping cavity to flow mutually through the oil flow control mechanism. The oil flow between the first damping cavity and the second damping cavity can be controlled through the oil flow control mechanism to adjust the damping force, when the oil flow is increased, the damping force is reduced, and when the oil flow is reduced, the damping force is increased, so that the damping force can be adjusted and controlled according to the earthquake action or other external force; and the safety of the civil structure is effectively guaranteed while the requirement for buffering the two structural units of the civil structure is met.

Description

Technical Field

[0001] The present invention relates to the field of dampers, and in particular to a damper for actively controlling damping force, a damping system and a damping system control method. Background Art

[0002] Civil engineering structures are prone to large vibrations when stimulated by external dynamic loads such as earthquakes, pedestrians, vehicles, and strong winds, which greatly affects the comfort and safety of the structure. Earthquakes have repeatedly damaged bridges and building structures, causing a large number of casualties and property losses in my country; and wind-induced vibrations also pose great safety hazards to civil structures. For civil structures, the effective means to reduce the impact of earthquakes and vibrations is to use seismic isolation methods, that is, to use seismic isolation devices in civil structures such as bridges and building structures to reduce the impact of vibrations on the structure.

[0003] From the perspective of function, seismic (vibration) isolation devices can be divided into three types: seismic (vibration) isolation devices, seismic (vibration) isolation devices or integrated seismic (vibration) isolation devices. Dampers are one of the most commonly used and largest-volume seismic (vibration) isolation devices. Seismic (vibration) isolation devices can be divided into passive control, active control, semi-active control and hybrid control based on whether external energy control is required. Most commonly used dampers are passively controlled.

[0004] In recent years, domestic and foreign scholars have been continuously researching new types of dampers for active control and semi-active control. Among them, eddy current technology and magnetorheological technology can be used as technical means for active control and semi-active control dampers to achieve the purpose of precise active control of structural vibration, and also lay the foundation for the intelligent construction and operation of civil structures. Among them, eddy current dampers change the size of eddy currents formed by changing the size of magnetic fields, thereby changing the size of damping force; magnetorheological dampers change the viscosity characteristics of viscous oil by changing the size of magnetic fields, thereby changing the size of damping force.

[0005] The main disadvantages of eddy current dampers are small damping force and large size. In addition, the magnetic properties of the built-in magnets are difficult to control. The technical means to achieve active control are relatively complex and are still in the research stage. In addition, the cost is also very high.

[0006] The main problem of magnetorheological damper is that the particles inside the magnetorheological fluid are easy to sink, resulting in poor performance stability; the particles inside the magnetorheological fluid are easy to affect the seal, resulting in a short life of the seal; and the cost is high. Summary of the invention

[0007] The main purpose of the present invention is to provide a damper, a damping system and a damping system control method for actively controlling the damping force, so as to at least solve the problems of small damping force, large size, complex control means, poor performance stability and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art.

[0008] In order to achieve the above-mentioned purpose, according to a first aspect of the present invention, there is provided a damper for actively controlling damping force, comprising: a cylinder body; a cylinder head, wherein the cylinder heads are two and the two cylinder heads are correspondingly arranged at the two ends of the cylinder body to seal the cylinder body, and the centers of the two cylinder heads are provided with axially opposite sliding holes; a piston, which is movably arranged in the cylinder body along the axial direction of the cylinder body to divide the inner cavity of the cylinder body into a first damping cavity and a second damping cavity with variable volumes; a piston rod, which passes through the piston from the center of the piston along the axial direction of the cylinder body and is fixedly connected to the piston, and the two ends of the piston rod correspondingly pass through the sliding holes of the two cylinder heads and extend to The outside of the cylinder body; a first connecting ear plate, fixedly arranged at the first end of the piston rod; a connecting body, arranged at one end of the cylinder body and corresponding to the second end of the piston rod; a second connecting ear plate, fixedly arranged on the connecting body; an oil flow control mechanism, arranged on the cylinder body; wherein a first oil hole connected to the first damping chamber and a second oil hole connected to the second damping chamber are opened on the cylinder body, and the oil flow control mechanism is connected to the first damping chamber and the second damping chamber correspondingly through the first oil hole and the second oil hole; the oil flow control mechanism is used to control the oil flow between the first damping chamber and the second damping chamber when the piston moves along the cylinder body to adjust the damping force.

[0009] Furthermore, there are multiple first oil holes and multiple second oil holes, and the multiple first oil holes and multiple second oil holes are evenly spaced along the circumference of the cylinder body; the oil flow control mechanism includes: solenoid valves, there are multiple solenoid valves, and the multiple solenoid valves are evenly spaced along the circumference of the cylinder body and correspond one-to-one to the multiple first oil holes and the multiple second oil holes; first high-pressure oil pipes and second high-pressure oil pipes, there are multiple first high-pressure oil pipes and second high-pressure oil pipes and correspond one-to-one to the multiple solenoid valves; wherein one port of each solenoid valve is connected to the corresponding first oil hole through a first high-pressure oil pipe, and the other port of each solenoid valve is connected to the corresponding second oil hole through a second high-pressure oil pipe; the oil flow control mechanism is used to control the opening number of the multiple solenoid valves to control the oil flow between the first damping chamber and the second damping chamber.

[0010] Furthermore, the first oil hole and the second oil hole are opened close to the inner side walls of the two cylinder heads.

[0011] Furthermore, a plurality of first annular sealing grooves are provided on the inner wall of the sliding hole of the cylinder cover, and a first sealing ring is arranged in each first annular sealing groove to slide and seal the outer wall of the piston rod with the inner wall of the sliding hole.

[0012] Furthermore, a plurality of second annular sealing grooves are formed on the outer peripheral side wall of the piston, and a second sealing ring is arranged in each second annular sealing groove to slidingly seal the outer peripheral side wall of the piston and the inner side wall of the cylinder body.

[0013] Furthermore, the connecting body is a cylindrical structure with one end closed and the other end open, and the open end of the connecting body is connected to one end of the cylinder body through a threaded structure and closes the second end of the piston rod.

[0014] Furthermore, the first connecting ear plate and the second connecting ear plate are both provided with connecting holes, and spherical bearings are arranged in the connecting holes.

[0015] According to a second aspect of the present invention, there is provided a damping system for actively controlling damping force, comprising: a vibration signal sensor, arranged on a civil structure, the vibration signal sensor being used to monitor an acceleration signal or a displacement signal of the civil structure; a controller, the controller being connected to the vibration signal sensor and receiving the acceleration signal or the displacement signal monitored by the vibration signal sensor; a damper, being connected to the controller, the damper being the damper described above; wherein the controller is connected to an oil flow control mechanism of the damper, the controller being used to send a control signal to the oil flow control mechanism according to the received acceleration signal or displacement signal to control the oil flow rate between the first damping chamber and the second damping chamber to adjust the damping force of the damper.

[0016] Furthermore, the controller is connected to a plurality of solenoid valves of the oil flow control mechanism, and the controller is used to control the opening number of the plurality of solenoid valves according to the received acceleration signal or displacement signal to control the oil flow between the first damping chamber and the second damping chamber.

[0017] According to the third aspect of the present invention, a control method for a damping system is provided, and the control method is applied to the damping system of the above content; the control method comprises: monitoring and acquiring the acceleration signal or displacement signal of the civil structure through a vibration signal sensor; a controller judging the damping force that the damper needs to generate according to the acceleration signal or displacement signal of the civil structure; and the controller sending a control signal to the oil flow control mechanism according to the damping force that the damper needs to generate to control the oil flow between the first damping chamber and the second damping chamber to adjust the damping force of the damper.

[0018] The damper for actively controlling damping force of the technical solution of the present invention comprises a cylinder body, a cylinder head, a piston, a piston rod, a first connecting ear plate, a connecting body, a second connecting ear plate and an oil flow control mechanism; there are two cylinder heads, and the two cylinder heads are correspondingly arranged at the two ends of the cylinder body to seal the cylinder body, and the centers of the two cylinder heads are provided with axially opposite sliding holes; the piston is movably arranged in the cylinder body along the axial direction of the cylinder body to divide the inner cavity of the cylinder body into a first damping chamber and a second damping chamber with variable volumes; the piston rod passes through the piston along the axial direction of the cylinder body from the center of the piston and is fixedly connected to the piston, and the two ends of the piston rod correspondingly pass through the sliding holes of the two cylinder heads and extend to the outside of the cylinder body; the first connecting ear plate is fixedly arranged at the first end of the piston rod; the connecting body is arranged at one end of the cylinder body and corresponds to the second end of the piston rod; the second connecting ear plate is fixedly arranged on the connecting body; the first connecting ear plate and the second connecting ear plate are respectively connected to two relatively movable structural units of the civil structure, and the oil flow control mechanism is arranged on the cylinder body; The cylinder body is provided with a first oil hole connected to the first damping chamber and a second oil hole connected to the second damping chamber. The oil flow control mechanism is connected to the first damping chamber and the second damping chamber respectively through the first oil hole and the second oil hole. When an earthquake or other external force occurs to cause relative displacement of the two structural units of the civil structure, the force will be transmitted to the cylinder body and the piston through the piston rod and the connecting body to cause relative movement of the piston and the cylinder body. The first damping chamber and the second damping chamber of the cylinder body are both filled with viscous oil. The relative movement between the piston and the cylinder body will cause the viscous oil in the first damping chamber and the second damping chamber to flow to each other through the oil flow control mechanism. The oil flow control mechanism can control the oil flow between the first damping chamber and the second damping chamber to adjust the damping force. When the oil flow increases, the damping force decreases, and when the oil flow decreases, the damping force increases. Therefore, the damping force can be regulated according to the magnitude of the earthquake or other external forces, and the safety of the civil structure can be effectively guaranteed while satisfying the buffering of the two structural units of the civil structure. The solution of the present invention achieves precise control of the damping force by controlling the oil flow of the damper, has a simple structure, stable performance and low cost, and solves the problems of small damping force, large size, complex control means, poor performance stability and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 is a schematic diagram of a three-dimensional structure of a damper for actively controlling damping force, which may be selected according to an embodiment of the present invention;

[0021] Figure 2is a schematic cross-sectional structure diagram of a damper for actively controlling damping force, which may be selected according to an embodiment of the present invention;

[0022] Figure 3 It is a structural block diagram of a damping system for actively controlling damping force which can be selected according to an embodiment of the present invention.

[0023] The above drawings include the following reference numerals:

[0024] 10. Cylinder body; 11. First damping chamber; 12. Second damping chamber; 13. First oil hole; 14. Second oil hole; 20. Cylinder head; 30. Piston; 40. Piston rod; 50. First connecting ear plate; 60. Connecting body; 70. Second connecting ear plate; 80. Oil flow control mechanism; 81. Solenoid valve; 82. First high-pressure oil pipe; 83. Second high-pressure oil pipe; 90. First sealing ring; 100. Second sealing ring; 110. Spherical bearing; 120. Vibration signal sensor; 130. Controller; 140. Damper. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] A first embodiment of the present invention provides a damper for actively controlling damping force, such as Figure 1 and Figure 2As shown, it includes a cylinder body 10, a cylinder head 20, a piston 30, a piston rod 40, a first connecting ear plate 50, a connecting body 60, a second connecting ear plate 70 and an oil flow control mechanism 80; there are two cylinder heads 20, and the two cylinder heads 20 are correspondingly arranged at both ends of the cylinder body 10 to seal the cylinder body 10, and the centers of the two cylinder heads 20 are both provided with axially opposite sliding holes; the piston 30 is movably arranged in the cylinder body 10 along the axial direction of the cylinder body 10 to divide the inner cavity of the cylinder body 10 into a first damping chamber 11 and a second damping chamber 12 with variable volumes; the piston rod 40 is formed by the central part of the piston 30 The piston 30 is passed through the axial direction of the cylinder body 10 and is fixedly connected to the piston 30. The two ends of the piston rod 40 can slide through the sliding holes of the two cylinder covers 20 and extend to the outside of the cylinder body 10. The first connecting ear plate 50 is fixedly arranged at the first end of the piston rod 40. The connecting body 60 is arranged at one end of the cylinder body 10 and corresponds to the second end of the piston rod 40. The second connecting ear plate 70 is fixedly arranged on the connecting body 60. The first connecting ear plate 50 and the second connecting ear plate 70 are respectively connected to the two relatively movable structural units of the civil structure. The oil flow control mechanism 80 is arranged on the cylinder body 10. 0; the cylinder body 10 is provided with a first oil hole 13 connected to the first damping chamber 11 and a second oil hole 14 connected to the second damping chamber 12, and the oil flow control mechanism 80 is connected to the first damping chamber 11 and the second damping chamber 12 through the first oil hole 13 and the second oil hole 14; when an earthquake or other external force occurs to cause the two structural units of the civil structure to have a relative displacement, the force will be transmitted to the cylinder body 10 and the piston 30 through the piston rod 40 and the connecting body 60, so that the piston 30 and the cylinder body 10 produce relative movement, and the first damping chamber 11 and the second damping chamber 12 of the cylinder body 10 are connected. The damping chambers 12 are filled with viscous oil. The relative movement between the piston 30 and the cylinder body 10 causes the viscous oil in the first damping chamber 11 and the second damping chamber 12 to flow mutually through the oil flow control mechanism 80. The oil flow control mechanism 80 can control the oil flow between the first damping chamber 11 and the second damping chamber 12 to adjust the damping force. When the oil flow increases, the damping force decreases, and when the oil flow decreases, the damping force increases. Thus, the damping force can be adjusted according to the magnitude of the earthquake or other external forces, and the safety of the civil structure can be effectively guaranteed while satisfying the buffering of the two structural units of the civil structure. The scheme of the present invention realizes precise control of the damping force by controlling the oil flow of the damper. It has a simple structure, stable performance and low cost. It solves the problems of small damping force, large size, complex control means, poor performance stability and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art.

[0027] In specific implementation, the damper of this embodiment is mainly used in the field of bridges, and the first connecting ear plate 50 and the second connecting ear plate 70 are respectively connected to the piers and the beam of the bridge, so as to buffer the longitudinal displacement of the beam under the action of earthquake or external force. In order to enable the oil flow between the first damping chamber 11 and the second damping chamber 12 to be quickly adjusted, thereby improving the rapid responsiveness of the damping force, further, the first oil hole 13 and the second oil hole 14 are both multiple, and the multiple first oil holes 13 and the multiple second oil holes 14 are evenly spaced along the circumference of the cylinder body 10; the oil flow control mechanism 80 includes multiple solenoid valves 81, multiple first high-pressure oil pipes 82 and multiple second high-pressure oil pipes 83, and the multiple solenoid valves 81 are evenly spaced along the circumference of the cylinder body 10 and correspond one-to-one with the multiple first oil holes 13 and the multiple second oil holes 14; the multiple first high-pressure oil pipes 82 and the multiple second high-pressure oil pipes 83 correspond one-to-one with the multiple solenoid valves 81; one port of each solenoid valve 81 is connected through a first high-pressure oil pipe 8 2 is connected to the corresponding first oil hole 13, and the other port of each solenoid valve 81 is connected to the corresponding second oil hole 14 through a second high-pressure oil pipe 83, so that the first damping chamber 11 and the second damping chamber 12 are connected to each other through the solenoid valve 81, the first high-pressure oil pipe 82 and the second high-pressure oil pipe 83. The opening or closing of the solenoid valve 81 is controlled to control the on-off of the first damping chamber 11 and the second damping chamber 12, and the oil flow between the first damping chamber 11 and the second damping chamber 12 can be further controlled by controlling the opening number of multiple solenoid valves 81. When the oil flow increases, the damping force decreases, and when the oil flow decreases, the damping force increases, thereby realizing accurate and rapid adjustment of the damping force to buffer the vibration and impact of external forces on the civil structure.

[0028] Furthermore, the first oil hole 13 and the second oil hole 14 are opened close to the inner side walls of the two cylinder heads 20, that is, the first oil hole 13 and the second oil hole 14 are opened at both ends of the inner cavity of the cylinder body 10, so as to ensure that the movement stroke of the piston 30 inside the cylinder body 10 will not affect the first oil hole 13 and the second oil hole 14. Optionally, an annular step groove is opened on the circumferential edge of the two side walls of the piston 30, and when the piston 30 moves to the extreme positions at both ends and contacts the cylinder head 20, the annular step groove can expose the first oil hole 13 and the second oil hole 14, so as to avoid blocking the first oil hole 13 and the second oil hole 14 and affecting the mutual flow of oil.

[0029] Furthermore, the inner wall of the sliding hole of the cylinder head 20 is provided with a plurality of first annular sealing grooves, and a first sealing ring 90 is arranged in each first annular sealing groove to slide and seal the outer wall of the piston rod 40 with the inner wall of the sliding hole; to ensure that when the piston 30 moves under high pressure, the oil in the first damping chamber 11 and the second damping chamber 12 will not leak from the gap between the piston rod 40 and the sliding hole. Optionally, the outer peripheral wall of the cylinder head 20 is provided with an external thread structure, and the corresponding position of the inner side wall of the oil cylinder body 10 is provided with an internal thread structure, and the cylinder head 20 is installed on the oil cylinder body 10 through the thread structure so that the cylinder head 20, the piston 30 and the piston rod 40 and other components can be removed from the oil cylinder body 10; optionally, the outer peripheral wall of the cylinder head 20 and the inner side wall of the oil cylinder body 10 are also provided with sealing rings to ensure that the oil in the first damping chamber 11 and the second damping chamber 12 will not leak.

[0030] Furthermore, a plurality of second annular sealing grooves are formed on the outer peripheral side wall of the piston 30, and a second sealing ring 100 is arranged in each second annular sealing groove to slidingly seal the outer peripheral side wall of the piston 30 and the inner side wall of the cylinder body 10, so that the first damping chamber 11 and the second damping chamber 12 are sealed with each other, ensuring that the oil can flow and be adjusted through the solenoid valve 81 as much as possible, thereby ensuring the accuracy of the damping force adjustment.

[0031] Furthermore, the connecting body 60 is a cylindrical structure with one end closed and the other end open. The open end of the connecting body 60 is connected to one end of the cylinder body 10 through a threaded structure and closes the second end of the piston rod 40 .

[0032] Furthermore, the first connecting ear plate 50 and the second connecting ear plate 70 are both provided with connecting holes, and a spherical bearing 110 is arranged in the connecting hole, which can make the axial direction of the cylinder body 10 always consistent with the direction of the force, thereby ensuring that the force between the two structural units of the civil structure always acts on the cylinder body 10 and the piston 30 along the axial direction, and protecting the cylinder body 10 and the piston 30 when the force is deflected.

[0033] A second embodiment of the present invention provides a damping system for actively controlling the damping force, such as Figure 3As shown, it includes a vibration signal sensor 120, a controller 130 and a damper 140. The vibration signal sensor 120 is arranged on the civil structure. The vibration signal sensor 120 is used to monitor the acceleration signal or displacement signal of the civil structure when an earthquake or external force occurs. The stronger the acceleration signal or displacement signal, the stronger the earthquake or external force. The controller 130 is connected to the vibration signal sensor 120 and receives the acceleration signal or displacement signal monitored by the vibration signal sensor 120. The controller 130 determines the earthquake or external force according to the acceleration signal or displacement signal. intensity, and accurately calculates the required damping force; the damper 140 is connected to the controller 130, and the damper 140 is the damper of the above-mentioned embodiment; the controller 130 is connected to the oil flow control mechanism 80 of the damper 140, and the controller 130 is used to send a control signal to the oil flow control mechanism 80 according to the calculated required damping force, and control the oil flow between the first damping chamber 11 and the second damping chamber 12 through the oil flow control mechanism 80 to adjust the damping force of the damper 140, so as to buffer the earthquake effect and external force effect and effectively protect.

[0034] Optionally, the controller 130 is connected to a plurality of solenoid valves 81 of the oil flow control mechanism 80. The controller 130 controls the opening number of the plurality of solenoid valves 81 according to the calculated required damping force, thereby controlling the oil flow between the first damping chamber 11 and the second damping chamber 12 and adjusting the damping force of the damper 140. When the oil flow increases, the damping force decreases, and when the oil flow decreases, the damping force increases, so that the damping force can be regulated according to the magnitude of the earthquake or other external forces, and the safety of the civil structure can be effectively guaranteed while satisfying the buffering of the two structural units of the civil structure. The scheme of the present invention realizes precise control of the damping force by controlling the oil flow of the damper, has a simple structure, stable performance and low cost, and solves the problems of small damping force, large size, complex control means, poor performance stability and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art.

[0035] The damping system of the embodiment of the present invention has the following three different working states:

[0036] When the solenoid valves 81 are all closed, there is no oil passage between the first damping chamber 11 and the second damping chamber 12. At this time, the two structural units of the civil structure give thrust to the cylinder body 10 and the piston rod 40. The piston 30 and the piston rod 40 cannot move relative to the cylinder body 10. The device is in a locked state and resists the force between the two structural units.

[0037] When one of the solenoid valves 81 is opened, there is only one hydraulic oil flow path between the first damping chamber 11 and the second damping chamber 12, and the flow rate is small. At this time, the two structural units of the civil engineering structure give thrust to the cylinder body 10 and the piston rod 40, and the piston 30 and the piston rod 40 move slowly relative to the cylinder body 10, or when the relative movement speed of the piston 30 and the piston rod 40 and the cylinder body 10 is constant, the piston rod 40 and the cylinder body 10 give the two structural units a large damping force.

[0038] When two of the solenoid valves 81 are open, the first damping chamber 11 and the second damping chamber 12 only have two hydraulic oil flow paths, and the flow rate is small. At this time, the two structural units of the civil engineering structure give thrust to the cylinder body 10 and the piston rod 40, and the piston 30 and the piston rod 40 move relatively slowly with the cylinder body 10, or when the relative movement speed of the piston 30 and the piston rod 40 and the cylinder body 10 is constant, the piston rod 40 and the cylinder body 10 give the two structural units a large damping force.

[0039] When the solenoid valve 81 is opened successively, the viscous oil flow rate of the first damping chamber 11 and the second damping chamber 12 changes from small to large. When the two structural units of the civil structure give the same thrust to the oil cylinder 10 and the piston rod 40, the speed of the relative movement of the piston 30 and the piston rod 40 and the oil cylinder 10 changes from small to large, or when the relative movement speed of the two structural units giving the piston 30 and the piston rod 40 and the oil cylinder 10 is constant, the damping force of the piston rod 40 and the oil cylinder 10 on the two structural units changes from large to small.

[0040] Therefore, by controlling the number of openings and closings of the solenoid valve 81, the magnitude of the damping force can be controlled.

[0041] The on-off of the solenoid valve 81 can be controlled according to the magnitude of the vibration or earthquake acceleration or other monitored physical quantities, thereby controlling the magnitude of the damping force of the damper and achieving the purpose of active control.

[0042] Among them, the general formula of viscous damper is: F = CV α

[0043] F—damping force; C—damping coefficient of viscous oil; V—relative motion speed between piston 30 and cylinder body 10; α—speed index.

[0044] The speed index is related to the flow rate of the solenoid valve 81 and the lengths of the first high-pressure oil pipe 82 and the second high-pressure oil pipe 83. When the flow rate of the solenoid valve 81 changes, the speed index α can be controlled, thereby controlling the damping force.

[0045] In the damping system of the embodiment of the present invention that actively controls the damping force, the vibration signal sensor 120 may be an acceleration or displacement sensor or other types of sensors. The sensor, such as an acceleration sensor, transmits the vibration or vibration acceleration signal generated by the structure to the controller 130. The controller 130 is an MCU or a PLC. The controller 130 controls the on and off of each solenoid valve 81 through a driving circuit, thereby actively controlling the magnitude of the damping force of the damper.

[0046] A third embodiment of the present invention provides a control method for a damping system, which is applied to the damping system of the above embodiment; the control method comprises the following steps:

[0047] S102: monitoring and acquiring the acceleration signal or displacement signal of the civil structure through the vibration signal sensor 120;

[0048] S104: The controller 130 determines the damping force that the damper 140 needs to generate according to the acceleration signal or displacement signal of the civil structure;

[0049] S106: The controller 130 sends a control signal to the oil flow control mechanism 80 according to the damping force that the damper 140 needs to generate to control the oil flow between the first damping chamber 11 and the second damping chamber 12 to adjust the damping force of the damper 140.

[0050] In step S104, the controller 130 determines the intensity of the earthquake or external force according to the acceleration signal or displacement signal of the civil structure, and accurately calculates the required damping force; in step S106, the controller 130 is connected to the multiple solenoid valves 81 of the oil flow control mechanism 80, and the controller 130 controls the opening number of the multiple solenoid valves 81 according to the calculated required damping force, thereby controlling the oil flow between the first damping chamber 11 and the second damping chamber 12 and adjusting the damping force of the damper 140. When the oil flow increases, the damping force decreases, and when the oil flow decreases, the damping force increases, so that the damping force can be adjusted according to the magnitude of the earthquake or other external force, and the safety of the civil structure can be effectively guaranteed while satisfying the buffering of the two structural units of the civil structure. The solution of the present invention achieves precise control of the damping force by controlling the oil flow of the damper, has a simple structure, stable performance and low cost, and solves the problems of small damping force, large size, complex control means, poor performance stability and high cost existing in active control dampers such as eddy current dampers and magnetorheological dampers in the prior art.

[0051] The damper, damping system and damping system control method for actively controlling the damping force of the present invention have the following technical effects:

[0052] The damper of the present invention can truly achieve the purpose of actively controlling the damping force by changing the oil circuit of the viscous damper; it can solve the problem of large difference in damping force between high temperature and low temperature of the viscous damper, and solve the problem of unstable performance of the viscous damper from the control point of view; when the damper is in normal working state (such as when there is no earthquake or vibration condition, the damper only produces temperature displacement of the structure), the oil circuit is fully opened, there is very small damping force, and there is almost no oil pressure inside the cylinder body, which can increase the service life of sealing parts such as sealing rings, thereby increasing the service life of the damper. In addition, the oil flow control mechanism is outside the cylinder body, which is convenient for maintenance, care and replacement.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A damper for actively controlling damping force, characterized in that: include: Cylinder body (10); Cylinder heads (20), two of the cylinder heads (20), the two cylinder heads (20) being correspondingly arranged at the two ends of the oil cylinder body (10) to seal the oil cylinder body (10), and the centers of the two cylinder heads (20) are each provided with axially opposite sliding holes; A piston (30) is movably arranged in the cylinder body (10) along the axial direction of the cylinder body (10) to separate the inner cavity of the cylinder body (10) into a first damping cavity (11) and a second damping cavity (12) with variable volumes; A piston rod (40), wherein the piston rod (40) passes through the piston (30) along the axial direction of the cylinder body (10) from the center of the piston (30) and is fixedly connected to the piston (30), and the two ends of the piston rod (40) correspondingly slidably pass through the sliding holes of the two cylinder covers (20) and extend to the outside of the cylinder body (10); A first connecting ear plate (50) fixedly arranged on the first end of the piston rod (40); A connecting body (60) is arranged at one end of the cylinder body (10) and corresponds to the second end of the piston rod (40); A second connecting ear plate (70) is fixedly arranged on the connecting body (60); An oil flow control mechanism (80) is arranged on the oil cylinder body (10); The cylinder body (10) is provided with a first oil hole connected to the first damping chamber (11) and a second oil hole connected to the second damping chamber (12); the oil flow control mechanism (80) is connected to the first damping chamber (11) and the second damping chamber (12) via the first oil hole and the second oil hole; the oil flow control mechanism (80) is used to control the oil flow between the first damping chamber (11) and the second damping chamber (12) to adjust the damping force when the piston (30) moves along the cylinder body (10).

2. The damper for actively controlling damping force according to claim 1, characterized in that: The first oil hole and the second oil hole are both multiple, and the multiple first oil holes and the multiple second oil holes are evenly spaced along the circumference of the cylinder body (10); the oil flow control mechanism (80) comprises: Solenoid valves (81), the solenoid valves (81) being multiple, the multiple solenoid valves (81) being evenly spaced along the circumference of the oil cylinder body (10) and corresponding one-to-one to the multiple first oil holes and the multiple second oil holes; a first high-pressure oil pipe (82) and a second high-pressure oil pipe (83), wherein the first high-pressure oil pipe (82) and the second high-pressure oil pipe (83) are multiple and correspond one-to-one to the multiple solenoid valves (81); One port of each solenoid valve (81) is connected to the corresponding first oil hole via a first high-pressure oil pipe (82), and another port of each solenoid valve (81) is connected to the corresponding second oil hole via a second high-pressure oil pipe (83); the oil flow control mechanism (80) is used to control the opening number of the plurality of solenoid valves (81) to control the oil flow between the first damping chamber (11) and the second damping chamber (12).

3. The damper for actively controlling damping force according to claim 1, characterized in that: The first oil hole and the second oil hole are opened close to the inner side walls of the two cylinder covers (20).

4. The damper for actively controlling damping force according to claim 1, characterized in that: The inner wall of the sliding hole of the cylinder cover (20) is provided with a plurality of first annular sealing grooves, and a first sealing ring (90) is arranged in each of the first annular sealing grooves to slide and seal the outer wall of the piston rod (40) with the inner wall of the sliding hole.

5. The damper for actively controlling damping force according to claim 1, characterized in that: A plurality of second annular sealing grooves are formed on the outer peripheral side wall of the piston (30), and a second sealing ring (100) is arranged in each of the second annular sealing grooves to slidingly seal the outer peripheral side wall of the piston (30) and the inner side wall of the cylinder body (10).

6. The damper for actively controlling damping force according to claim 1, characterized in that: The connecting body (60) is a cylindrical structure with one end closed and the other end open. The open end of the connecting body (60) is connected to one end of the cylinder body (10) through a threaded structure and closes the second end of the piston rod (40).

7. The damper for actively controlling damping force according to claim 1, characterized in that: The first connecting ear plate (50) and the second connecting ear plate (70) are both provided with connecting holes, and joint bearings (110) are arranged in the connecting holes.

8. A damping system for actively controlling damping force, characterized in that: include: A vibration signal sensor (120) is arranged on the civil engineering structure, and the vibration signal sensor (120) is used to monitor the acceleration signal or displacement signal of the civil engineering structure; A controller (130), the controller (130) being connected to the vibration signal sensor (120) and receiving an acceleration signal or a displacement signal monitored by the vibration signal sensor (120); a damper (140), connected to the controller (130), wherein the damper (140) is the damper according to any one of claims 1 to 7; The controller (130) is connected to the oil flow control mechanism (80) of the damper (140), and the controller (130) is used to send a control signal to the oil flow control mechanism (80) according to a received acceleration signal or displacement signal to control the oil flow between the first damping chamber (11) and the second damping chamber (12) to adjust the damping force of the damper (140).

9. The damping system for actively controlling damping force according to claim 8, characterized in that: The controller (130) is connected to a plurality of solenoid valves (81) of the oil flow control mechanism (80), and the controller (130) is used to control the opening number of the plurality of solenoid valves (81) according to the received acceleration signal or displacement signal to control the oil flow between the first damping chamber (11) and the second damping chamber (12).

10. A control method for a damping system, characterized in that: The control method is applied to the damping system according to claim 8; the control method comprises: Monitoring and acquiring an acceleration signal or a displacement signal of a civil structure through a vibration signal sensor (120); The controller (130) determines the damping force that the damper (140) needs to generate according to the acceleration signal or the displacement signal of the civil engineering structure; The controller (130) sends a control signal to the oil flow control mechanism (80) according to the damping force that the damper (140) needs to generate, so as to control the oil flow between the first damping chamber (11) and the second damping chamber (12) to adjust the damping force of the damper (140).

Images