Force Control of Main Landing Gear using Hybrid Magneto-Rheological Damper

Abstract

To improve not only the basic performance but also the fail-safe performance, power consumption of the main landing gear for helicopters, a semi-active control landing gear using hybrid MR damper, was introduced in this paper. This damper of the configuration to install a permanent magnet in a electromagnet MR damper, was designed by the trade-off study on permanent magnet location and a magnet field analysis. Force control algorithm which keep the sum of air spring force and damping force at a specified value during landing, was used for the controller. The drop simulations using ADAMS Model for this semi-active control landing gear, were done. The improvement of the preceding performances as the result to evaluate the landing performance by the simulations, has been confirmed.

Robust Adaptive Control for an Aircraft Landing Gear Equipped with a Magnetorheological Damper

“…With the measurements from at least two types of sensors (e.g., a position sensor which measures the stroke, and an accelerometer, which measures the acceleration of the aircraft), the adaptive controller requires the estimates of aircraft mass and sink speed for calculating an appropriate skyhook gain and target damping force for a hybrid control block. The hybrid control [18] is a combination of the force control [26] and the skyhook control [27] methods. The force control is a method of maximizing the impact energy absorption efficiency of a damper by filling up the gap between Fmax and damper force curve over stroke.…”

“…The results are plotted in Figure 4b: the target damping force increases with larger aircraft mass and faster sink speed. The hybrid control [18] is a combination of the force control [26] and the skyhook control [27] methods. The force control is a method of maximizing the impact energy absorption efficiency of a damper by filling up the gap between F max and damper force curve over stroke.…”