항공기용 MR 댐퍼의 스카이-그라운드 훅 제어기 설계

초록

In this paper, a semi-active magnetorheological (MR) damper is proposed that can be applied to mainlanding gear suspension system of the aircraft. For the modeling of MR damper, a damping force in theannular orifice and an air force in the damper strut are derived. A MR damper with two magnetic coresis designed to control the damping force with sufficient dynamic range. After modeling the damper, itsstructural design with the annular type bypass for fast tension speed is determined considering the characteristicsof the landing situation of the aircraft. In addition, through the magnetic field analysis of twomagnetic cores, controllable yield force of MR fluid is proposed, designed by the magnetic intensityconsidering the input current. Next, superior performance of the semi-active damper is demonstrated bycalculating the aircraft landing efficiency of passive and semi-active dampers by the damper excitationand aircraft drop simulations. To maximize the landing efficiency of drop simulation, the sky-groundcontrol logic is established. The sky hook and ground hook coefficients can be adjusted by tuning thesky-ground hook weighting factor. After calculating the sky-ground hook force with the best-tuned skyhook and ground hook coefficients, the damping force of the MR damper is controlled by the calculatedinput current. Consequently, the optimized efficiency plot was obtained in comparison with controlledand passive dampers.

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