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CN-122013733-A - Flood discharge gate vibration damper with buckling restrained brace coupled with active damping

CN122013733ACN 122013733 ACN122013733 ACN 122013733ACN-122013733-A

Abstract

The invention relates to the technical field of damping control of hydraulic engineering structures, and discloses a flood discharge gate damping device with buckling restrained brace coupling active damping, which comprises a middle support structure, wherein an electric cabinet is arranged on the middle support structure, the active viscous damper and the buckling restrained brace are symmetrically arranged on two sides of the middle supporting structure in parallel, one end of the active viscous damper and one end of the buckling restrained brace are connected to the middle supporting structure, and the other end of the active viscous damper is used for being connected with a gate pier. According to the invention, the vibration state is monitored through the electric control system, the active viscous damper is driven to adjust the oil passing hole area, and the active and passive cooperative vibration reduction is realized by matching with the hysteresis energy consumption of the buckling restrained brace. The device is arranged between the sluice pier structures of the flood discharge sluice, can adaptively adjust damping force along with working condition changes, gives consideration to high-low frequency vibration control, tracks the optimal damping ratio in real time, widens the vibration reduction frequency band, and improves the safety and durability of the flood discharge sluice.

Inventors

  • LIU BO
  • LI HUOKUN
  • ZHONG RUI

Assignees

  • 南昌大学

Dates

Publication Date
20260512
Application Date
20260225

Claims (10)

  1. 1. The flood discharge gate vibration damper with the buckling restrained brace coupled with the active damping comprises a middle supporting structure (4), and is characterized in that an electric cabinet (1) is installed on the middle supporting structure (4), active viscous dampers (2) and buckling restrained braces (3) are symmetrically arranged on two sides of the middle supporting structure (4) in parallel, one ends of the active viscous dampers (2) and the buckling restrained braces (3) are connected to the middle supporting structure (4), and the other ends of the active viscous dampers and the buckling restrained braces are used for being connected with gate piers; An electric control system is arranged in the electric control box (1), monitors states of the gate pier, the active viscous damper (2) and the buckling restrained brace (3) through a sensing system, drives an executing mechanism integrated in the active viscous damper (2) to act, and adjusts damping force of the active viscous damper (2).
  2. 2. The flood discharge gate vibration damper of buckling restrained brace coupling active damping according to claim 1, wherein the active viscous damper (2) comprises a cylinder barrel (21), the cylinder barrel (21) is arranged at two sides outside a middle supporting structure (4), a piston (22) is slidably arranged inside the cylinder barrel (21), one end of the piston (22) is connected with an inside hollow piston rod (23), the other end of the piston (22) is connected with an end connecting piece (24), a rotating shaft (25) is coaxially arranged inside the piston rod (23) in a penetrating manner, the input end of the rotating shaft (25) is connected with a positive and negative rotating motor fixed at the end of the piston rod (23), the output end of the rotating shaft (25) is connected with a control fan blade (26) attached to the surface of the piston (22), and an oil-passing damping through hole (27) matched with the control fan blade (26) in rotation adjustment is formed in the piston (22).
  3. 3. The flood discharge gate vibration damper of buckling restrained brace coupling active damping according to claim 1, wherein the buckling restrained brace (3) comprises a cross-shaped cross-section inner core (31) and a peripheral square restrained 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 peripheral square restrained steel tube (33), and two ends of the cross-shaped cross-section inner core (31) extend out of the peripheral square restrained steel tube (33) and are respectively connected with end connection modules (34).
  4. 4. The flood discharge gate vibration damper with buckling restrained brace coupling active damping according to claim 1, wherein the middle supporting structure (4) comprises an I-beam (41) which is horizontally arranged, two side flanges of the I-beam (41) are welded with bolt connection panels (42) for installing the active viscous damper (2) and the buckling restrained brace (3), an inclined supporting beam (43) is connected below the I-beam (41), and two ends of the inclined supporting beam (43) are connected to the bottom of the I-beam (41) and the side wall of a gate pier through riveting supports respectively.
  5. 5. A flood discharge gate vibration damper with buckling restrained brace coupling active damping according to claim 3, characterized in that the end connection module (34) comprises a riveted support and a welded connection bottom plate which are riveted with each other, the riveted support is connected with a gate pier and a middle support structure (4) through bolts, and the welded connection bottom plate is welded with the cross-shaped section inner core (31).
  6. 6. The flood discharge gate vibration damper with buckling restrained brace coupling active damping according to claim 1, wherein the sensing system comprises a left side VD damping force sensor (11) and a right side VD damping force sensor (12), the left side VD damping force sensor (11) and the right side VD damping force sensor (12) are respectively installed on cylinder barrels (21) of the active viscous damper (2) at two sides, a left side BRB damping force sensor (15) and a right side BRB damping force sensor (16) are respectively installed on exposed inner cores (31) of the cross-shaped section of the buckling restrained brace (3) at two sides, and a left side gate pier displacement sensor (17) and a right side gate pier displacement sensor (18) are respectively installed on the gate piers at two sides.
  7. 7. The buckling restrained brace coupling active damping flood discharge gate vibration damping device according to claim 6, wherein a switch circuit is arranged in the electric control system and comprises a comparator, a relay 1 and a single-pole double-throw switch controlled by the relay 1, the non-inverting input end of the comparator is connected with a damping force sensitive resistor which is regulated by signals of the left BRB damping force sensor (15) and the right BRB damping force sensor (16), and the inverting input end of the comparator is connected with an adjustable resistor which provides reference voltage.
  8. 8. The buckling restrained brace coupling active damping flood discharge gate vibration damping device according to claim 7, wherein the electric control system further comprises a motor working circuit, a left side forward and reverse motor input end (13) and a right side forward and reverse motor input end (14) are arranged on the electric control box (1), the motor working circuit comprises a contactor KM1 and a contactor KM2 which are connected to the single pole double throw switch contact, and the output ends of the contactor KM1 and the contactor KM2 are electrically connected to a forward and reverse motor in the active viscous damper (2) through the left side forward and reverse motor input end (13) and the right side forward and reverse motor input end (14).
  9. 9. The flood discharge gate vibration damper with buckling restrained brace coupling active damping according to claim 8, wherein the switch circuit is further connected in series with a control loop, the control loop comprises a displacement variable resistor regulated by signals of the left gate pier displacement sensor (17) and the right gate pier displacement sensor (18), and a relay 2 connected with the displacement variable resistor, and the relay 2 is controlled by a stop switch connected in series on a total power supply of the motor working circuit, and is used for cutting off power supply of the forward and reverse rotation motor when the resistance value of the displacement variable resistor is lower than a set threshold value.
  10. 10. The flood discharge gate vibration damper with buckling restrained brace coupling active damping according to claim 8, wherein an electrical interlocking structure is arranged between the contactor KM1 and the contactor KM2, normally closed auxiliary contacts of the contactor KM1 are connected in series in a coil loop of the contactor KM2, and normally closed auxiliary contacts of the contactor KM2 are connected in series in the coil loop of the contactor KM 1.

Description

Flood discharge gate vibration damper with buckling restrained brace coupled with active damping Technical Field The invention relates to the technical field of hydraulic engineering structure vibration reduction control, in particular to a flood discharge gate vibration reduction device with buckling restrained brace coupling active damping. Background The flood discharge gate is used as a key pivot structure in hydraulic engineering, and is subjected to the impact of high-speed water flow for a long time in the running process, so that the problem of flow excitation is extremely easy to cause. Especially for the light and thin type gate pier structure with small thickness-height ratio, huge energy carried by flood discharge water flow often causes severe transverse river vibration of the gate pier, which not only directly affects the safety and stability of the structure of the flood discharge gate, but also can interfere the normal operation and maintenance of the flood discharge gate, and even threatens the safety of the whole hydraulic engineering when serious. Aiming at the vibration problem, the prior art mainly adopts passive or active vibration reduction means. In the aspect of passive vibration reduction, a Buckling Restrained Brace (BRB) can form stable and reproducible plastic hysteresis energy consumption at the strong vibration stage of a gate pier by virtue of a yield restraint mechanism of a core material, and plays the role of a passive fuse, but the starting threshold is higher, the stiffness degradation is carried out after the braking, the small-amplitude and high-frequency flow excitation vibration is difficult to effectively inhibit, the self parameters cannot be adjusted in real time along with the change of external excitation, and the traditional Viscous Damper (VD) has a simple structure and full-band speed-related energy consumption capability, but the damping coefficient is fixed, and cannot be adjusted in real time when the self-vibration frequency drift or the nonlinear change of the flow excitation vibration intensity caused by water level fluctuation is faced, so that the phenomenon of damping mismatch of insufficient high-frequency damping or excessive low-frequency amplification is extremely easy to occur. In the aspect of active vibration reduction, the active VD capable of actively changing the resistance coefficient realizes stepless adjustment of the damping coefficient by means of a control circuit and a built-in motor, has the advantages of quick response, low energy consumption, good linearity and the like, can track the optimal damping ratio of a structure in real time and quickly respond to low-frequency vibration, is limited by physical limitations such as installation space and valve port saturation, and if the active VD is independently applied to vibration reduction of a flood discharge gate, the maximum output is difficult to independently bear huge flood discharge flow excitation energy. Therefore, the invention provides a flood discharge gate vibration damper with buckling restrained brace coupled with active damping, which solves the defects in the prior art. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a flood discharge gate vibration damper with buckling restrained brace coupling active damping, which solves the problems that the existing single active and passive vibration damping technology is difficult to simultaneously consider the high-frequency micro amplitude and low-frequency strong vibration control requirements of the flood discharge gate, and the damping parameters cannot be adaptively adjusted in real time along with the change of water level and flood discharge flow. The flood discharge gate vibration damper comprises a middle support structure, wherein an electric cabinet is arranged on the middle support structure, active viscous dampers and buckling restrained braces are symmetrically and parallelly arranged on two sides of the middle support structure, one ends of the active viscous dampers and the buckling restrained braces are connected to the middle support structure, and the other ends of the active viscous dampers and the buckling restrained braces are used for being connected with the gate piers; An electric control system is arranged in the electric cabinet, monitors states of the gate pier, the active viscous damper and the buckling restrained brace through a sensing system, drives an executing mechanism integrated in the active viscous damper to act, and adjusts damping force of the active viscous damper. Preferably, the active viscous damper comprises a cylinder barrel, the cylinder barrel is arranged on two sides outside a middle supporting structure, a piston is arranged in the cylinder barrel in a sliding manner, one end of the piston is connected with an internal hollow piston rod, the other end of the piston is connected with an end connecting piece, a rotating shaft is coaxially ar