Design And Energy Dissipation Mechanism Of The Feedback Controlled Friction Damper

Vibration is a common physical phenomenon in construction, machinery and equipment.The severe vibration may cause damage to part or the whole structure. Vibration will restrictthe dynamic properties, reliability and service lifetime of the mechanical structure. To ensurethe normal operation of equipments or structures, vibration control has become one of themost important factors in the structure design.Installation of the energy dissipator in the mechanical structure can control its vibrationeffectively. The friction damper has low price, wide range of application, easily obtainedadvantages beside of excellent energy dissipation characteristic. But the development of thefriction damper is facing a few difficult problems, such as its damping force is single withsmall adjustment range; and its energy dissipation capacity could not vary with the change ofvibration source. To make use of the vibration source for improving the damper’santi-vibration effects, the structure of the feedback-controlled friction damper is designed.Based on the combination of the Column friction model and semi-active control theory, itsenergy dissipation mechanism is developed in this paper.The feedback-friction damper is controlled by the feedback signal of the vibrationstructure displacement. To study its energy dissipation mechanism, the structure of thedamper is designed, and its energy dissipation mechanism is studied through numericalsimulation and FEA. At last, some experiments on the static and dynamic performance of thenew damper have been done in this paper.Firstly, the feedback-controlled friction damper, which can use the vibrationdisplacement of the vibration controlled structure as feedback control signal, with rationalstructure and good energy dissipation is designed in this paper. Through the adjustment of thefluid pressure in the damper, its damping force could change with the variation of thevibration signal. In the design of the key components of the damper, the strength and stiffnessanalyses of them have been finished, which is to ensure the safety and reliability of the newstructure.Secondly, based on the work principal of the damper and the Column model theory, themathematical model of the feedback-controlled friction damper has been built. Use Matlab to simulate its work process, and to study the influence factors of energy dissipation mechanism,which includes the rod diameter, initial volume and pressure of the gas chamber. Finally, thetheoretical force-displacement hysteresis curve is gained in this paper.Thirdly, the finite element analysis of the oil-pressurized gas chamber and rod structurehas been done, which gets the influence of the fluid pressure to its damping force. In addition,the influence of the fluid pressure to the anti-force of the rod is simulated, and the influence ofthe vibration controlled structure signal to its energy dissipation mechanism is studied throughchanging the frequency and amplitude of vibration source.Fourthly, according to the work principal of the damper, a test prototype with rationalparameters is designed and manufactured, which is to study static and dynamic energydissipation performance of the damper. Finally, the theoretical and simulation results arecompared to the experimental results, which is to modify and to improve the theoretical andsimulation analysis accuracy.