A state-of-the-art review on passive friction dampers and their applications

Numerical evaluation of a novel passive variable friction damper for vibration mitigation

Self-Centering Frictional Damper (SCFD)

Development and parametric study of a new self-centering rotational friction damper

Cam-based passive variable friction device for structural control

Modeling and experimental investigation of a novel arc-surfaced frictional damper

The invention discloses a container crane magneto-rheological intelligent damping device which comprises an integrated controller (1), an electric signal control connector (2), a sensor (3) and two magneto-rheological dampers (5) of composite structures and a supporting rod (12). Each damper (5) is provided with two damping cylinders which are filled with elastic cement gum (9) and magneto-rheological fluid (12), wherein the magneto-rheological fluid (12) enters the other side of a piston through a bypass damping hole (13), and a decoupling device (22) is arranged inside the damper. The integrated controller (1) is connected with damper wires through the electric signal control connector (2). Needed current is provided for the two magneto-rheological dampers (5) of the composite structures according to the measurement values of the sensor (3), and therefore the seismic response of the structure is controlled. The container crane magneto-rheological intelligent damping device can give corresponding control strategies without excessive signal processing, and is convenient to use and obvious in damping effect.

Container crane magneto-rheological intelligent damping device

In this paper, a new arc-surfaced frictional damper (AFD) is proposed and its hysteretic behavior is experimentally studied. Then the device is applied to container crane based on a seesaw mechanism. The major advantage of the seesaw damping system is that the long tension cables can be utilized as bracing between the seesaw member and the portal legs to avoid compression and buckling of the cables. A simplified trilinear force-displacement model on the basis of experimental results is adopted to represent the hysteretic behavior of AFD. After that, seismic responses of container crane with and without dampers to four earthquakes are studied using nonlinear dynamic time-history analysis. Besides this system, a diagonal-brace-AFD system is studied for comparison. A method based on the displacement and energy dissipation ratio is proposed to find the optimum slip force for seesaw damping system. Performance of AFD control system is assessed though various parameters including displacement and maximum portal frame drift angle. Results prove a feasible application of AFD control system to absorb large amounts of seismic energy and significantly reduce the structural responses.

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Arc-Surfaced Frictional Damper for Vibration Control in Container Crane

The utility model relates to a novel cambered surface friction damper, including friction plate (3), slider (4), chain pole (1), rubber spring (5) and wedge (9), it is inside that friction plate (3) are stretched into in chain pole (1), and the outside of chain pole (1) is butt clamp installation wedge (9), rubber spring (5) and slider (4) in proper order from inside to outside, and the interior sliding surface of friction plate (3) is followed in slider (4), and the internal surface of friction plate (3) is the arc, and the contact surface of slider (4) and friction plate (3) is the arc. The utility model discloses under little shake effect, the produced frictional force of this attenuator is less, shakes greatly under the load in, and along with the increase of slider displacement, the attenuator is exerted oneself and to be lasted the grow, and it is more to consume energy, and this friction damper is applicable to the earthquake load of different intensity. This practical novel cambered surface friction damper still has simple structure, with low costs, easy realization, uses reliable characteristics, but wide application in fields such as building, hoist, spatial grid structure.

Wang Dong

Papers

Modeling and experimental investigation of a novel arc-surfaced frictional damper

Container crane magneto-rheological intelligent damping device

Arc-Surfaced Frictional Damper for Vibration Control in Container Crane

Novel cambered surface friction damper