Research On MRF Buffer For Guest Elevator

As masses of staff have been entering cities continuously, urban population keeps an increasing trend, making housing problems become more severe, and indirectly causing plenty of high buildings’ emergence, both of which together trigger massive usage and purchasing of social elevators. In the process of their usage, it is very necessary to ensure that the elevator functions well to the bottom layer even when something breaks down, for buffers of the elevators,as the last safety equipment, could avoid casualties in a case when the lift reaches the bottom but fails to stop running. With the installment of bottom pit buffers, safe landing of elevators can be assured, which makes the buffer one of the necessary safety devices for one elevator. Magneto-rheological fluids, as a kind of smart materials which are applied in many fields of buffers, have shown its ideal cushioning effect. In this paper, magneto-rheological fluid buffers will replace traditional elevator buffers in order to achieve strong control during the process, generate constant damping force and improve the real effect.This paper is going to conduct a brief study and research on the use types of elevator buffers, its present development, and use of magneto-rheological damper for passenger lifts. By analyzing the surface features of magneto-rheological fluids, and based on different constitutive relations, we are able to calculate its mathematical model. Structure design and controller design are two main considering points in the overall designing process of magneto-rheological fluid buffers.Structure design mainly includes the design of those buffers’ articles and components and the magnetic circuit pattern. First of all, we must analyze the design requirements of elevator buffers, in accordance with which we further go on devising component structure of magneto-rheological fluid dampers by comparing with traditional hydraulic buffers, including selection of working chamber diameter, piston, reset device, piston rods and and components of materials. The design of the magnetic circuit is mainly aimed at the turn number and the structure size of the coil. Analyzing the magnetic circuit via a related software, we can draw functional relation between the current and the magnetic field, which will lay a foundation on the simulation experiment.Take the finished design of the magneto-rheological fluid buffer into Simulink for a simulation, and record different buffer effects caused by different currents. In this way, we can test if it meets the requirements of the design for the controller and make sure it can be put into production and practice. Then with the analysis of simulation experiment results and designing steps of fuzzy controller, the design of the controller is completed. Finally through Simulink by doing the simulation of the magneto-rheological fluid buffer controller, it proves that the magneto-rheological fluid buffer can achieve a more ideal effect.