Flood discharge gate vibration reduction device with buckling restrained brace coupled with active damping
By connecting active viscous dampers and buckling-restrained braces in parallel between the floodgate piers, and combining this with an electronic control system to achieve real-time adjustment of the damping force, the requirements for high-frequency micro-amplitude and low-frequency strong vibration control of the floodgate piers were solved, and an effective vibration reduction effect across the entire frequency band was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NANCHANG UNIV
- Filing Date
- 2026-02-25
- Publication Date
- 2026-05-12
AI Technical Summary
Existing technologies cannot simultaneously meet the requirements for controlling both high-frequency low-amplitude and low-frequency strong vibrations of floodgate piers, and cannot adaptively adjust damping parameters in real time according to changes in water level and flood discharge flow.
A vibration reduction device with buckling-restrained bracing coupled with active damping is adopted. By setting active viscous dampers and buckling-restrained bracing in parallel on both sides of the central support structure, the structure status is monitored by an electronic control system and the dampers are driven to operate, thereby realizing real-time adjustment of the damping force and constructing a high- and low-frequency complementary synergistic vibration reduction system.
It achieves effective control of flow-induced vibration across the entire frequency band of the floodgate, overcomes the shortcomings of single vibration reduction technology, and has the ability to quickly respond and adjust damping with high precision, thereby reducing energy consumption and extending the service life of the device.
Smart Images
Figure CN122013733A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vibration reduction and control technology for hydraulic engineering structures, specifically to a vibration reduction device for a floodgate with buckling-restrained bracing and coupled active damping. Background Technology
[0002] As a key structural element in water conservancy projects, floodgates are subjected to the impact of high-speed water flow over long periods of time during operation, making them highly susceptible to flow-induced vibration. This is especially true for thin-walled pier structures with a low thickness-to-height ratio; the enormous energy carried by the floodwater flow often causes severe transverse vibrations in the piers. This not only directly affects the structural safety and stability of the floodgate itself but also interferes with its normal operation and maintenance, and in severe cases, even threatens the safety of the entire water conservancy project.
[0003] To address the aforementioned vibration issues, existing technologies primarily employ passive or active vibration reduction methods. In passive vibration reduction, buckling-restrained braces (BRBs), relying on the yielding constraint mechanism of their core material, can form stable and reproducible plastic hysteretic energy dissipation during periods of strong vibration in the gate pier, acting as a passive fuse. However, their activation threshold is high, and stiffness degradation occurs after yielding, making it difficult to effectively suppress small-amplitude, high-frequency flow-induced vibrations. Furthermore, they cannot adjust their parameters in real time according to changes in external excitation. Traditional viscous dampers (VDs), while simple in structure and possessing full-band velocity-dependent energy dissipation capabilities, have fixed damping coefficients at the factory. Faced with drift in the structure's natural frequency due to water level fluctuations or nonlinear changes in the intensity of flow-induced vibrations, they cannot be adjusted in real time, easily leading to damping mismatch phenomena such as insufficient high-frequency damping or excessive low-frequency amplification.
[0004] In terms of active vibration reduction, although the active VD that can actively change the drag coefficient achieves stepless adjustment of the damping coefficient by relying on the control circuit and built-in motor, it has advantages such as fast response, low energy consumption and good linearity. It can track the optimal damping ratio of the structure in real time and respond quickly to low-frequency vibration. However, due to physical limitations such as installation space and valve saturation, if it is applied alone to the vibration reduction of the floodgate, its maximum output is often unable to independently bear the huge flood discharge flow-induced vibration energy.
[0005] Therefore, the present invention provides a buckling-restrained braced coupled active damping floodgate vibration reduction device to overcome the shortcomings of the prior art. Summary of the Invention
[0006] To address the shortcomings of existing technologies, this invention provides a buckling-constrained bracing coupled active damping vibration reduction device for floodgates. This solves the problem that existing single active and passive vibration reduction technologies cannot simultaneously meet the control requirements of high-frequency micro-amplitude and low-frequency strong vibration of floodgate piers, and cannot adaptively adjust damping parameters in real time according to changes in water level and flood discharge flow.
[0007] To achieve the above objectives, the present invention provides the following technical solution: a floodgate vibration reduction device with buckling-restrained bracing coupled with active damping arranged between floodgate piers, comprising a central support structure, an electrical control box mounted on the central support structure, and active viscous dampers and buckling-restrained braces symmetrically connected in parallel on both sides of the central support structure, wherein one end of the active viscous damper and the buckling-restrained brace is connected to the central support structure, and the other end is used to connect to the pier; The electrical control box is equipped with an electrical control system. The electrical control system monitors the state of the gate pier, the active viscous damper, and the buckling restraint support through a sensor system, and drives the actuator integrated inside the active viscous damper to adjust the damping force of the active viscous damper.
[0008] Preferably, the active viscous damper includes a cylinder, which is disposed on both sides outside the central support structure. A piston is slidably disposed inside the cylinder. One end of the piston is connected to a hollow piston rod, and the other end of the piston is connected to an end connector. A rotating shaft is coaxially disposed inside the piston rod. The input end of the rotating shaft is connected to a forward and reverse rotating motor fixed to the end of the piston rod, and the output end of the rotating shaft is connected to a control fan blade that fits against the surface of the piston. An oil damping through hole is provided on the piston to cooperate with the rotation adjustment of the control fan blade.
[0009] Preferably, the buckling restraint support includes a cross-shaped cross-section inner core and an outer square restraint steel tube sleeved outside the cross-shaped cross-section inner core. A viscoelastic material filling layer is filled between the cross-shaped cross-section inner core and the outer square restraint steel tube. The outer square restraint steel tube extends from both ends of the cross-shaped cross-section inner core and is respectively connected to an end connection module.
[0010] Preferably, the central support structure includes a horizontally arranged I-beam, with bolted connection panels welded to the two flanges of the I-beam for installing the active viscous damper and the buckling restraint support. An inclined support beam is connected to the bottom of the I-beam, and the two ends of the inclined support beam are respectively connected to the bottom of the I-beam and the side wall of the gate pier through riveted supports.
[0011] Preferably, the end connection module includes riveted supports and welded connection base plates that are riveted together. The riveted supports are connected to the gate pier and the central support structure by bolts, and the welded connection base plate is welded to the inner core of the cross-shaped section.
[0012] Preferably, the sensing system includes a left VD damping force sensor and a right VD damping force sensor. The left VD damping force sensor and the right VD damping force sensor are respectively installed on the cylinders of the active viscous dampers on both sides. The left BRB damping force sensor and the right BRB damping force sensor are respectively installed at the exposed core of the cross-shaped cross section of the buckling restraint support on both sides. The left gate pier displacement sensor and the right gate pier displacement sensor are respectively installed on the gate piers on both sides.
[0013] Preferably, the electronic control system is provided with a switching circuit, which includes a comparator, a relay 1, and a single-pole double-throw switch controlled by the relay 1. The non-inverting input of the comparator is connected to a damping force-sensitive resistor that is adjusted by the signals of the left BRB damping force sensor and the right BRB damping force sensor. The inverting input of the comparator is connected to an adjustable resistor that provides a reference voltage.
[0014] Preferably, the electrical control system further includes a motor operating circuit. The electrical control box is provided with a left forward / reverse motor input terminal and a right forward / reverse motor input terminal. The motor operating circuit includes contactors KM1 and KM2 connected to the single-pole double-throw switch contacts. The output terminals of contactors KM1 and KM2 are both electrically connected to the forward / reverse motor in the active viscous damper through the left forward / reverse motor input terminal and the right forward / reverse motor input terminal.
[0015] Preferably, the switching circuit is further connected in series with a control loop, which includes a displacement variable resistor adjusted by the signals of the left gate pier displacement sensor and the right gate pier displacement sensor, and a relay 2 connected to the displacement variable resistor. The relay 2 controls a stop switch connected in series with the main power supply of the motor working circuit, which is used to cut off the power supply to the forward and reverse motor when the resistance value of the displacement variable resistor is lower than a set threshold.
[0016] Preferably, an electrical interlocking structure is provided between the contactor KM1 and the contactor KM2, the normally closed auxiliary contact of the contactor KM1 is connected in series in the coil circuit of the contactor KM2, and the normally closed auxiliary contact of the contactor KM2 is connected in series in the coil circuit of the contactor KM1.
[0017] This invention provides a vibration reduction device for a floodgate with buckling-restrained bracing and coupled active damping. It has the following beneficial effects: 1. This invention constructs a complementary high- and low-frequency synergistic vibration reduction system by arranging active viscous dampers and buckling-restrained braces in parallel on both sides of the central support structure between the floodgate piers. The buckling-restrained braces utilize core material yielding to provide stable hysteretic energy dissipation, serving as a passive safety measure against low-frequency, large-amplitude, strong vibrations. The active viscous dampers, on the other hand, provide velocity-dependent damping through active adjustment for high-frequency, small-amplitude vibrations. The two components complement each other in the time and frequency domains, overcoming the shortcomings of single passive elements (high activation threshold, unable to suppress high-frequency micro-vibrations) and single active elements (limited output, unable to cope with strong vibrations), thus achieving effective control of flow-induced vibrations across the entire frequency band of the floodgate.
[0018] 2. This invention utilizes an electronic control system combined with feedback signals from damping force and displacement sensors to drive a forward and reverse motor integrated inside the damper to rotate and control the fan blades, thereby changing the flow area of the oil damping through-hole. This allows the device to sense the drift of the structure's natural frequency caused by changes in flood discharge flow and water level, and accordingly achieve millisecond-level stepless adjustment of the damping coefficient, always maintaining the structure in the optimal damping ratio state. This solves the mismatch problem of insufficient high-frequency damping or excessive low-frequency amplification that easily occurs in traditional fixed-parameter dampers under complex working conditions.
[0019] 3. This invention incorporates a motor operating circuit with an electrical interlock structure and an automatic start-stop circuit based on a displacement threshold in the electrical control system, achieving integrated closed-loop control encompassing sensing, analysis, adjustment, and protection. Contactor interlocking prevents short-circuit risks during rapid forward and reverse switching of the motor, while displacement monitoring ensures automatic power cut-off and device reset once vibration returns to a safe range. This intelligent design not only improves system response speed and control accuracy but also reduces operating energy consumption and extends the device's service life in humid, water-rich environments. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of a buckling-restrained braced coupled active damping floodgate vibration reduction device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the external structure of the active viscous damper in an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal cross-sectional structure of the active viscous damper in an embodiment of the present invention; Figure 4 This is a partially enlarged structural diagram of the control fan blades and pistons cooperating to adjust the damping orifice inside the active viscous damper in an embodiment of the present invention. Figure 5 This is a schematic diagram showing the connection between the sensing system and the electrical control box in an embodiment of the present invention; Figure 6 This is a schematic diagram of the buckling restraint support in an embodiment of the present invention; Figure 7 This is a schematic diagram of the central support structure in an embodiment of the present invention; Figure 8 This is a circuit diagram of the electronic control system in an embodiment of the present invention.
[0021] The components include: 1. Electrical control box; 11. Left VD damping force sensor; 12. Right VD damping force sensor; 13. Left forward / reverse motor input terminal; 14. Right forward / reverse motor input terminal; 15. Left BRB damping force sensor; 16. Right BRB damping force sensor; 17. Left gate pier displacement sensor; 18. Right gate pier displacement sensor; 2. Active viscous damper; 21. Cylinder; 22. Piston; 23. Piston rod; 24. End connector; 25. Rotating shaft; 26. Control fan blade; 27. Oil damping through hole; 3. Buckling restraint brace; 31. Cross-shaped cross-section inner core; 32. Viscoelastic material filling layer; 33. Outer square restraint steel pipe; 34. End connection module; 4. Central support structure; 41. I-beam; 42. Bolted connection panel; 43. Diagonal support beam. Detailed Implementation
[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Please see the appendix Figure 1 This invention provides a vibration reduction device for a floodgate with buckling-restrained bracing coupled with active damping, comprising a central support structure 4, on which an electrical control box 1 is installed; active viscous dampers 2 and buckling-restrained braces 3 are symmetrically arranged in parallel on both sides of the central support structure 4; one end of the active viscous damper 2 and the buckling-restrained brace 3 is connected to the central support structure 4, and the other end is used to connect to the gate pier; The electrical control box 1 is equipped with an electrical control system. The electrical control system monitors the status of the gate pier, the active viscous damper 2 and the buckling restraint support 3 through the sensor system, and drives the actuator integrated inside the active viscous damper 2 to adjust the damping force of the active viscous damper 2.
[0024] Specifically, the spillway gate pier, in its mechanical model, is a cantilever structure with a fixed bottom and a free top. When subjected to dynamic loads such as the vibration of the flood discharge, the displacement constraint at the top is weakest, and the dynamic response amplitude is largest. Since the top of the gate pier is usually near the upstream side where traffic bridges or working bridges are located, limiting installation space, this vibration damping device is placed on the top of the gate pier near the downstream side, which is the extreme value region of the gate pier's amplitude, effectively improving vibration damping efficiency. The central support structure 4 acts as a rigid reaction seat, with symmetrically arranged active viscous dampers 2 and buckling-restrained supports 3 on both sides forming a parallel and coordinated energy dissipation system. In terms of working mechanism, the active viscous damper 2 utilizes the fluid viscosity characteristics, is sensitive to velocity response, and can intervene first in the micro-vibration stage; the buckling-restrained support 3 utilizes the metal yield characteristics, is sensitive to displacement response, and provides stable plastic hysteretic energy dissipation in the strong vibration stage. This structure allows the device to dissipate energy through viscous damping under small vibrations and through metal yielding under large vibrations, achieving full-condition coverage under different amplitudes and frequencies.
[0025] Please see the appendix Figure 2 , Figure 3 and Figure 4 The active viscous damper 2 includes a cylinder 21, which is located on both sides of the outer side of the central support structure 4. A piston 22 is slidably disposed inside the cylinder 21. One end of the piston 22 is connected to a hollow piston rod 23, and the other end of the piston 22 is connected to an end connector 24. A rotating shaft 25 is coaxially disposed inside the piston rod 23. The input end of the rotating shaft 25 is connected to a forward and reverse motor fixed to the end of the piston rod 23, and the output end of the rotating shaft 25 is connected to a control fan blade 26 that fits against the surface of the piston 22. An oil damping through hole 27 is provided on the piston 22 to adjust the rotation of the control fan blade 26.
[0026] Specifically, cylinder 21 serves as the main container for damping, filled with a high-viscosity viscous fluid. When the gate vibrates, driving piston 22 to reciprocate within cylinder 21, the viscous fluid is forced to flow at high speed through oil damping through-hole 27. This generates intense internal friction between fluid molecules and friction between the fluid and the hole wall, converting mechanical energy into heat energy. To achieve dynamic adjustment of the damping coefficient, the device utilizes a reversible motor as the actuator. Torque is transmitted through a rotating shaft 25 coaxially inserted within the hollow piston rod 23, driving the control blades 26, which are attached to the piston surface, to rotate. When the electronic control system drives the reversible motor to perform a forward rotation, the motor drives the control blades 26 to rotate, blocking the oil damping through-hole 27 and reducing the effective flow area, thus increasing the resistance to fluid flow. When the electronic control system drives the reversible motor to perform a reverse rotation, the motor drives the control blades 26 to rotate in the opposite direction, increasing the effective flow area. The rotational stroke of the shaft 25 is limited to ensure that the control fan blade 26 can move precisely between fully open and fully closed without interfering with the opening and closing state of adjacent holes, thus realizing continuous stepless adjustment of the damping force from minimum to maximum value.
[0027] Please see the appendix Figure 6 The buckling restraint brace 3 includes a cross-shaped cross-section inner core 31 and an outer square restraint steel tube 33 sleeved outside the cross-shaped cross-section inner core 31; a viscoelastic material filling layer 32 is filled between the cross-shaped cross-section inner core 31 and the outer square restraint steel tube 33; the outer square restraint steel tube 33 extends from both ends of the cross-shaped cross-section inner core 31 and is respectively connected to an end connection module 34; Specifically, the cruciform cross-section inner core 31 of the buckling-restrained brace 3 primarily bears tensile and compressive stresses under axial loads. To address the problem of Euler buckling leading to a sharp decrease in bearing capacity in ordinary steel braces under compression, this embodiment incorporates an outer square restraint steel tube 33 and a viscoelastic material filling layer 32 around the inner core. The viscoelastic material filling layer 32 not only acts as an isolation medium, allowing relative sliding and plastic deformation of the inner core in the axial direction, but also transfers the lateral force generated by the compressive expansion of the inner core to the outer steel tube. The outer square restraint steel tube 33 provides sufficient lateral stiffness to limit the overall buckling instability of the inner core. Through this restraint mechanism, the cruciform cross-section inner core 31 can enter a yield state across its entire cross section under both tension and compression, exhibiting a full and stable spindle-shaped hysteresis curve. This ensures that the device can continuously and stably dissipate seismic or flow-induced vibration energy during rare strong earthquakes, functioning as a structural safety device.
[0028] Please see the appendix Figure 7The central support structure 4 includes a horizontally arranged I-beam 41. The two flanges of the I-beam 41 are welded with bolted connection panels 42 for installing active viscous dampers 2 and buckling restraint supports 3. The lower part of the I-beam 41 is connected to an inclined support beam 43. The two ends of the inclined support beam 43 are connected to the bottom of the I-beam 41 and the side wall of the gate pier respectively through riveted supports.
[0029] Specifically, the central support structure 4 is used to construct a stable force transmission path. The I-beam 41 horizontally spans between the two connection points, and is connected to the panel 42 via bolts welded to the flanges, collecting horizontal loads from the active viscous dampers 2 and buckling-restrained supports 3 on both sides. To prevent out-of-plane instability or excessive deformation of the I-beam 41 under load, a diagonal support beam 43 is installed below. One end of the diagonal support beam 43 is anchored to the side wall of the gate pier, and the other end supports the bottom of the I-beam 41, forming a stable triangular geometry. The connections between components use a combination of riveted supports and high-strength bolts, ensuring nodal stiffness and facilitating on-site assembly. This effectively transmits the reaction force generated by the dampers to the main body of the gate pier, increasing the lateral stiffness of the gate pier and providing a stable mounting base for the vibration reduction device.
[0030] Please see the appendix Figure 6 The end connection module 34 includes riveted supports and welded connection base plates that are riveted together; the riveted supports are connected to the gate pier and the middle support structure 4 by bolts, and the welded connection base plate is welded to the cross-shaped cross-section inner core 31.
[0031] Specifically, the welded connection base plate, as the direct load-bearing end, is solidified with the extension of the cross-shaped cross-section core 31 using a full penetration welding process. Since the cross-shaped cross-section core 31 needs to enter a plastic yield state to dissipate energy during operation, its end connection must possess extremely high tensile and compressive strength and stiffness. The welding method effectively eliminates connection gaps, preventing node slippage or loosening under high-frequency reciprocating loads and ensuring the fullness and stability of the hysteresis curve. On the other hand, the riveted support, as the transition interface with the main structure, is anchored to the concrete wall of the gate pier or the steel beam of the central support structure 4 using a group of high-strength bolts. This bolted connection method provides the necessary installation tolerance on the construction site, facilitating equipment alignment and leveling. Even after encountering rare strong earthquakes or extreme working conditions that could cause permanent damage, the bolted connection allows maintenance personnel to completely remove and quickly replace the damaged support unit simply by disassembling the bolts without damaging the main structure of the gate pier or the central support system. The riveted support and the welded connection base plate are pre-assembled into one unit through the riveting process, forming a stable mechanical transmission unit. This not only ensures the extremely high shear strength of the node, but also achieves an effective balance between factory prefabrication quality control and on-site assembly efficiency.
[0032] Please see the appendix Figure 5The sensing system includes a left VD damping force sensor 11 and a right VD damping force sensor 12. The left VD damping force sensor 11 and the right VD damping force sensor 12 are respectively installed on the cylinder 21 of the two active viscous dampers 2. The left BRB damping force sensor 15 and the right BRB damping force sensor 16 are respectively installed at the exposed part of the cross-shaped core 31 of the buckling restraint support 3 on both sides. The left gate pier displacement sensor 17 and the right gate pier displacement sensor 18 are respectively installed on the two gate piers.
[0033] Specifically, the left-side BRB damping force sensor 15 and the right-side BRB damping force sensor 16 are strain gauge force sensors, attached to the elastic segment of the inner core, directly monitoring the stress state of the passive support components. This data reflects the stress level of the structure. The left-side VD damping force sensor 11 and the right-side VD damping force sensor 12 are typically hydraulic sensors or tension / compression sensors, used to provide real-time feedback on the output force of the active damper for verifying the control effect. The left-side gate pier displacement sensor 17 and the right-side gate pier displacement sensor 18 are installed on the top of the gate pier to monitor the absolute displacement or relative amplitude of the structure in real time. These multi-source sensor data construct a complete structural state vector, providing precise physical basis for the electronic control system to determine vibration intensity, identify frequency drift, and trigger start / stop logic.
[0034] Please see the appendix Figure 8 The electronic control system has an internal switching circuit, which includes a comparator, a relay 1, and a single-pole double-throw switch controlled by the relay 1. The non-inverting input of the comparator is connected to a damping force-sensitive resistor that is adjusted by the signals of the left BRB damping force sensor 15 and the right BRB damping force sensor 16. The inverting input of the comparator is connected to an adjustable resistor that provides a reference voltage.
[0035] Specifically, the switching circuit is responsible for logically judging the vibration trend and generating control commands, converting the force signal collected by the BRB damping force sensor into a voltage signal input to the non-inverting input of the comparator. An adjustable resistor is connected to the inverting input of the comparator to set the system's operating threshold voltage, which corresponds to the structure's safe force limit. When the external excitation increases, causing the force on the BRB to increase and the voltage at the non-inverting input to exceed the reference voltage at the inverting input, the comparator flips to output a high level, driving the coil of relay 1 to energize and engage, thus switching the single-pole double-throw switch from its normal position to L-L1. Conversely, when the vibration weakens and the force decreases, causing the voltage at the non-inverting input to fall below the reference voltage, the comparator outputs a low level, relay 1 is de-energized and released, and the switch resets to L-L2. This achieves automatic logic switching based on the force state, eliminating the need for complex microprocessor programming and featuring fast response speed and high circuit reliability.
[0036] The electrical control system also includes a motor operating circuit. The electrical control box 1 is equipped with a left forward and reverse motor input terminal 13 and a right forward and reverse motor input terminal 14. The motor operating circuit includes contactors KM1 and KM2 connected to the contacts of a single-pole double-throw switch. The output terminals of contactors KM1 and KM2 are electrically connected to the forward and reverse motors in the active viscous damper 2 through the left forward and reverse motor input terminal 13 and the right forward and reverse motor input terminal 14.
[0037] Specifically, the motor operating circuit is a high-voltage circuit that executes adjustment commands and is responsible for driving the motor to rotate in both directions. The circuit is equipped with two AC contactors, KM1 and KM2, corresponding to the motor's forward (resistance increase) and reverse (resistance decrease) logic, respectively. When the single-pole double-throw switch closes the L-L1 contact, the contactor KM1 coil is energized and its main contacts close, connecting the power supply to the motor in the positive phase sequence, driving the motor to rotate forward, thereby reducing the damping orifice area of the control fan blade 26. When the switch closes the L-L2 contact, the contactor KM2 coil is energized and its main contacts close, connecting the power supply to the motor in the reverse phase sequence, driving the motor to rotate in reverse, increasing the damping orifice area. A fuse is connected in series at the circuit input to quickly cut off the power supply in the event of a short circuit. A thermal relay is connected in series in the motor power supply circuit; when the motor overheats due to mechanical jamming or frequent starts, the thermal relay trips to cut off the circuit, preventing the motor from burning out.
[0038] The switching circuit is also connected in series with a control circuit; the control circuit includes a displacement variable resistor regulated by the signals of the left gate pier displacement sensor 17 and the right gate pier displacement sensor 18, and a relay 2 connected to the displacement variable resistor; the relay 2 controls a stop switch connected in series with the main power supply of the motor working circuit, which is used to cut off the power supply to the forward and reverse motor when the resistance value of the displacement variable resistor is lower than the set threshold.
[0039] Specifically, the control loop is used to realize the system's automatic standby and energy-saving reset functions. The resistance value of the displacement variable resistor is positively correlated with the amplitude monitored by the gate pier displacement sensor. When the gate pier is in a safe state of stillness or slight vibration, the resistance value of the displacement variable resistor is low, relay 2 is in the energized state (or in the released state), and the stop switch connected in series with the motor's main power supply remains open. At this time, the entire motor drive system is de-energized, the forward and reverse motors stop working, and the active viscous damper 2 remains in the initial low-damping state with the oil passage fully open under the action of the mechanical reset mechanism or gravity. This normal power-off design not only significantly reduces the long-term operating energy consumption of the device, but also reduces the ineffective wear of the motor and mechanical parts. The stop switch is only closed when the vibration displacement exceeds the set threshold, the system wakes up and enters the active adjustment mode.
[0040] An electrical interlocking structure is provided between contactor KM1 and contactor KM2; the normally closed auxiliary contact of contactor KM1 is connected in series in the coil circuit of contactor KM2, and the normally closed auxiliary contact of contactor KM2 is connected in series in the coil circuit of contactor KM1.
[0041] Specifically, since contactors KM1 and KM2 are connected to different phase sequences of the power supply, if they are both energized simultaneously, it will cause a direct short circuit between the phases of the power supply, leading to a serious equipment accident. Therefore, in this embodiment, the normally closed auxiliary contact of contactor KM1 is connected in series in the coil control circuit of contactor KM2. When the coil of KM1 is energized and energized, its normally closed auxiliary contact physically opens, forcibly cutting off the coil path of KM2. Even if the control logic errs and issues a reverse command at this time, KM2 cannot operate; similarly, when KM2 is energized, KM1 is also locked. This hardware-based interlocking logic ensures that the motor can only be in one of three states—forward, reverse, or stopped—at any given time, guaranteeing the safety of the electrical control system under frequent switching conditions.
[0042] Working Principle: When using this device, the active viscous dampers 2 and buckling restraint supports 3 on both sides of the central support structure 4 work together to reduce vibration. In the initial state, the active viscous dampers 2 respond to the velocity change first with the oil damping through-hole 27 fully open. The buckling restraint supports 3 consume energy through the cross-shaped cross-section core 31 and the viscoelastic material filling layer 32. When the load increases and the gate pier amplitude exceeds the threshold, the left BRB damping force sensor 15 and the right BRB damping force sensor 16 detect the increase in damping force. The signal is transmitted to the electrical control box 1, causing the resistance of the damping force sensitive resistor to rise. The voltage at the non-inverting input of the comparator is higher than the reference voltage, and the output level is high. This drives the relay 1 to close, switching the single-pole double-throw switch to L-L1. The coil of contactor KM1 is energized and simultaneously locks contactor KM2 through the normally closed auxiliary contact, forming an electrical circuit. The air interlock, with its main contacts closed, drives the forward and reverse motor to rotate forward, causing the rotating shaft 25 and control fan blade 26 to rotate clockwise, blocking the oil damping through hole 27, reducing the orifice area and thus increasing the damping force of the active viscous damper 2; if the vibration weakens, the sensor detects the decrease in damping force, the comparator outputs a low level, causing relay 1 to de-energize, the switch to reset to L-L2, contactor KM2 to be energized, and contactor KM1 to be locked at the same time, the forward and reverse motor reverses, driving the control fan blade 26 to rotate counterclockwise, increasing the area of the oil damping through hole 27 to reduce the damping force; when the left gate pier displacement sensor 17 and the right gate pier displacement sensor 18 detect that the displacement has decreased to a safe range, the resistance value of the displacement variable resistor decreases, triggering relay 2 to act, disconnecting the stop switch connected in series with the main power supply, the forward and reverse motor is de-energized and stops working, and the device returns to its initial state.
Claims
1. A buckling-restrained braced coupled active damping vibration reduction device for a floodgate, comprising a central support structure (4), characterized in that, An electrical control box (1) is installed on the central support structure (4). Active viscous dampers (2) and buckling restraint braces (3) are symmetrically connected in parallel on both sides of the central support structure (4). One end of the active viscous damper (2) and the buckling restraint brace (3) is connected to the central support structure (4), and the other end is used to connect to the gate pier. The electrical control box (1) is equipped with an electrical control system. The electrical control system monitors the state of the gate pier, the active viscous damper (2), and the buckling restraint support (3) through a sensor system, and drives the actuator integrated inside the active viscous damper (2) to adjust the damping force of the active viscous damper (2).
2. The buckling-restrained braced coupled active damping floodgate vibration reduction device according to claim 1, characterized in that, The active viscous damper (2) includes a cylinder (21), which is located on both sides of the outer side of the central support structure (4). A piston (22) is slidably arranged inside the cylinder (21). One end of the piston (22) is connected to a hollow piston rod (23), and the other end of the piston (22) is connected to an end connector (24). A rotating shaft (25) is coaxially inserted inside the piston rod (23). The input end of the rotating shaft (25) is connected to a forward and reverse motor fixed to the end of the piston rod (23), and the output end of the rotating shaft (25) is connected to a control fan blade (26) that fits against the surface of the piston (22). An oil damping through hole (27) is opened on the piston (22) to cooperate with the rotation adjustment of the control fan blade (26).
3. The buckling-restrained braced coupled active damping floodgate vibration reduction device according to claim 1, characterized in that, The buckling restraint support (3) includes a cross-shaped cross-section inner core (31) and an outer square restraint steel tube (33) sleeved outside the cross-shaped cross-section inner core (31). A viscoelastic material filling layer (32) is filled between the cross-shaped cross-section inner core (31) and the outer square restraint steel tube (33). The outer square restraint steel tube (33) extends from both ends of the cross-shaped cross-section inner core (31) and is respectively connected to an end connection module (34).
4. The buckling-restrained braced coupled active damping floodgate vibration reduction device according to claim 1, characterized in that, The central support structure (4) includes a horizontally arranged I-beam (41). Bolted connection panels (42) for installing the active viscous damper (2) and the buckling restraint support (3) are welded to the two flanges of the I-beam (41). An inclined support beam (43) is connected to the bottom of the I-beam (41) and the side wall of the gate pier, respectively, through riveted supports.
5. The buckling-restrained braced coupled active damping floodgate vibration reduction device according to claim 3, characterized in that, The end connection module (34) includes a riveted support and a welded connection base plate that are riveted together. The riveted support is connected to the gate pier and the middle support structure (4) by bolts. The welded connection base plate is welded to the cross-shaped cross-section inner core (31).
6. The buckling-restrained braced coupled active damping vibration reduction device for a floodgate according to claim 1, characterized in that, The sensing system includes a left VD damping force sensor (11) and a right VD damping force sensor (12). The left VD damping force sensor (11) and the right VD damping force sensor (12) are respectively installed on the cylinder (21) of the active viscous damper (2) on both sides. The exposed part of the cross-shaped cross-section inner core (31) of the buckling restraint support (3) on both sides is respectively equipped with a left BRB damping force sensor (15) and a right BRB damping force sensor (16). The left gate pier displacement sensor (17) and the right gate pier displacement sensor (18) are respectively installed on the gate pier on both sides.
7. A buckling-restrained braced coupled active damping floodgate vibration reduction device according to claim 6, characterized in that, The electronic control system is equipped with a switching circuit, which includes a comparator, a relay 1 and a single-pole double-throw switch controlled by the relay 1. The non-inverting input of the comparator is connected to a damping force-sensitive resistor that is adjusted by the signals of the left BRB damping force sensor (15) and the right BRB damping force sensor (16). The inverting input of the comparator is connected to an adjustable resistor that provides a reference voltage.
8. A buckling-restrained braced coupled active damping floodgate vibration reduction device according to claim 7, characterized in that, The electrical control system also includes a motor working circuit. The electrical control box (1) is provided with a left forward and reverse motor input terminal (13) and a right forward and reverse motor input terminal (14). The motor working circuit includes contactors KM1 and KM2 connected to the single-pole double-throw switch contacts. The output terminals of contactors KM1 and KM2 are electrically connected to the forward and reverse motor in the active viscous damper (2) through the left forward and reverse motor input terminal (13) and the right forward and reverse motor input terminal (14).
9. A buckling-restrained braced coupled active damping floodgate vibration reduction device according to claim 8, characterized in that, The switching circuit is also connected in series with a control loop, which includes a displacement variable resistor that is adjusted by the signals of the left gate pier displacement sensor (17) and the right gate pier displacement sensor (18), and a relay 2 connected to the displacement variable resistor. The relay 2 controls a stop switch connected in series with the main power supply of the motor working circuit, which is used to cut off the power supply of the forward and reverse motor when the resistance value of the displacement variable resistor is lower than a set threshold.
10. A buckling-restrained braced coupled active damping floodgate vibration reduction device according to claim 8, characterized in that, An electrical interlocking structure is provided between contactor KM1 and contactor KM2. The normally closed auxiliary contact of contactor KM1 is connected in series in the coil circuit of contactor KM2, and the normally closed auxiliary contact of contactor KM2 is connected in series in the coil circuit of contactor KM1.