항공기용 MR 댐퍼의 스카이-그라운드 훅 제어기 설계

Abstract

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