CN-117489748-B - Single flywheel resettable inertial damper

Abstract

The invention belongs to the technical field of energy dissipation and vibration reduction of structures, relates to a single flywheel resettable inertial damper, and relates to a passive vibration reduction device which can be applied to a small structure or a bridge cable structure and is used for inhibiting vibration of the structure under the action of earthquake or wind load. The device is realized by matching a gear and rack transmission and bevel gear reversing system, a flywheel and an eddy current damping system. The invention ensures that the damper provides inertia force and damping force in the stage that the structure speed exceeds the flywheel speed in the structure reciprocating motion process, the rest stages do not provide control force, and meanwhile, the flywheel decelerates and brakes in the time period, so that the inertia force and damping force can be continuously obtained in the acceleration stage when the structure reciprocates, and the performance of BangBang control is approximately realized in a passive form.

Inventors

• LI LUYU
• LIANG QIGANG
• OU JINPING
• YU DELEI
• BAI XIAOYU

Assignees

• 大连理工大学

Dates

Publication Date

20260505

Application Date

20231011

Claims (1)

1. 1. The single flywheel resettable inertial damper is characterized by comprising a gear rack transmission and bevel gear reversing system, a flywheel and an eddy current damping system; The gear-rack transmission and bevel gear reversing system comprises a device shell (1), a rack guide rail (2), a rack (3), a cylindrical gear (4), a large bevel gear (5), a small bevel gear (6), a speed changer (7), a transmission rod (11) and a one-way bearing (12), wherein the device shell (1) is of a cylindrical structure, one end of the device shell is sealed, a circular ring is arranged outside the device shell and is used for mounting a damper, the other end of the device shell is of an opening structure, the rack guide rail (2), the rack (3), the cylindrical gear (4), the large bevel gear (5) and the one-way bearing (12) are respectively two, the rack guide rail (2) is fixed on the inner wall of the device shell (1) in parallel, the rack (3) is mounted on the rack guide rail (2), one end of the rack (3) is positioned in the device shell (1), the other end of the rack (3) is positioned outside the device shell (1) and is connected into a whole through a connecting plate, the connecting plate is provided with a circular ring and is used for mounting the damper, the cylindrical gear (4) is fixed on the two ends of the cylindrical gear (11) on the two inner walls of the device shell (11) respectively, and the two ends of the cylindrical gear (11) are meshed with the two cylindrical gears (11) are respectively, the gear rack (3) drives the cylindrical gears (4) to rotate, the cylindrical gears (4) are connected through a transmission rod (11) and drive a one-way bearing (12) to rotate, the large conical gears (5) are arranged on the transmission rod (11) through the one-way bearing (12) and positioned between the two cylindrical gears (4), the small conical gears (6) are arranged between the two large conical gears (5) and meshed with the two large conical gears (5), when the locking direction of the one-way bearing (12) is consistent with the movement direction of the large conical gears (5) on the same side, the large conical gears (5) drive the small conical gears (6) to rotate, the small conical gears (6) are meshed and drive the large conical gears (5) on the other side to idle, the transmission (7) is arranged in the device shell (1), the output shaft of the transmission is connected with the small conical gears (6), and is driven to the flywheel and the electric vortex damping system through the transmission (7) to amplify the rotation speed of the small conical gears (6); The flywheel and eddy current damping system comprises a flywheel (8), a magnet sheet (9), a copper ring (10) and a magnet fixing bolt (13), wherein the flywheel (8) is connected with an input shaft of a transmission (7), a group of tile-shaped magnet sheets (9) are fixed on the surface of the flywheel (8) through the magnet fixing bolt (13), the copper ring (10) is fixed on the inner surface of a device shell (1), the flywheel (8) drives the magnet sheets (9) to rotate, a radial magnetic field generated by the magnet sheets (9) rotates, eddy current is generated in the copper ring (10), and energy dissipation is carried out.

Description

Single flywheel resettable inertial damper Technical Field The invention belongs to the technical field of energy dissipation and vibration reduction (vibration) of structures, relates to a single flywheel resettable inertial damper, and relates to a passive energy dissipation and vibration reduction (vibration) device which can be applied to a small structure or a bridge cable structure and is used for inhibiting vibration of the structure under earthquake or wind vibration. Background The method has important strategic significance in improving the service performance of the civil structure and the infrastructure and effectively improving the wind resistance and the earthquake resistance of the civil structure. The passive control technology is independent of the input of external energy, is a stable and reliable vibration control strategy, and is widely applied to vibration control of civil structures. In recent years, inertial containers have become a hotspot for research in the civil field. The inertial container is an acceleration type shock absorber, the theoretical model of the inertial container is a two-node unit, the unit output is an inertial force, the inertial force is proportional to the relative acceleration between two nodes, and the output performance of the inertial container is represented by the size of a proportionality coefficient. The inertial container can obviously reduce the load strength of an input structure, so that the structural response is reduced, and the inertial container has more obvious damping (vibration) effect on a long-period structure. Research shows that the inertial container can provide unfavorable thrust in the structure deceleration stage, so that the structure deceleration process is prolonged, and finally the structure displacement response is overlarge. After the ratchet wheel device is introduced between the flywheel of the inertial container and the transmission system, the flywheel can only rotate in one direction, the flywheel can be driven only when the structure is in an acceleration stage, and the flywheel can not transmit load back to the structure, so that the problem that the flywheel provides unfavorable thrust to the structure can be solved mechanically. However, since the flywheel lacks energy consumption mechanism, the kinetic energy obtained from the structure cannot be consumed or transferred, and therefore the flywheel always keeps a certain speed idle before the next vibration cycle starts, so that the energy consumption and vibration reduction (vibration) effects of the device cannot be continuously and efficiently exerted. Disclosure of Invention In order to solve the problems, the invention provides a single flywheel resettable inertial damper, which only produces force in a specific acceleration stage in each vibration cycle of a structure, realizes flywheel deceleration or braking by using eddy current damping in a specific deceleration stage, ensures that the flywheel is in a low speed or static state before the acceleration stage, only obtains inertial force and damping force in the specific acceleration stage in reciprocating vibration, and approximately realizes BangBang control in a passive form. The technical scheme of the invention is as follows: a single flywheel resettable inertial damper comprises a gear-rack transmission and bevel gear reversing system, a flywheel and an eddy current damping system. The gear-rack transmission and bevel gear reversing system comprises a device shell 1, a rack guide rail 2, a rack 3, a cylindrical gear 4, a large conical gear 5, a small conical gear 6, a speed changer 7, a transmission rod 11 and a one-way bearing 12; the device shell 1 is of a cylindrical structure, one end of the device shell is sealed, a circular ring is arranged outside the device shell and used for installing a damper, and the other end of the device shell is of an opening structure; the gear rack guide rail 2, the gear rack 3, the cylindrical gear 4, the large conical gear 4 and the one-way bearing 12 are respectively two, the gear rack guide rail 2 is fixed on the inner wall of the device shell 1 in parallel, the gear rack 3 is installed on the gear rack guide rail 2, the gear rack 3 reciprocates along the gear rack guide rail 2, one end of the gear rack 3 is positioned in the device shell 1, the other end of the gear rack 3 is positioned outside the device shell 1, the end parts positioned outside the device shell 1 are connected into a whole through a connecting plate, a circular ring is arranged on the connecting plate and used for installing a damper, the cylindrical gear 4 is fixed on a transmission rod 11, two ends of the transmission rod 11 are fixed on the inner wall of the device shell 1, the two cylindrical gear 4 are respectively meshed with the two gear racks 3, the gear rack 3 drives the cylindrical gear 4 to rotate, the one-way bearing 12 is connected through the transmission rod 11, the large conical gea