Electrical engineering

Control engineering

Archaeology

Automotive engineering

Touchdown

Magnetorheological damper

Mathematics

Agronomy

Structural engineering

Biology

History

Gene

Parametric statistics

Statistics

Magnetorheological fluid

Damper

Engineering

Control system

Artificial intelligence

Controller (irrigation)

Control (management)

Chemistry

Skyhook

Landing gear

Computer science

Robust control

Control theory (sociology)

Biochemistry

Robustness (evolution)

Applied Sciences

A landing gear of an aircraft is required to function at touchdown in different landing scenarios with parametric uncertainties. A typical passive damper in a landing gear has limited performance in differing landing scenarios, which can be overcome with magnetorheological (MR) dampers. An MR damper is a semi-active system that can adjust damping force by changing the amount of electric current applied to it. This paper proposes a new robust controller based on model reference sliding mode control and adaptive hybrid control to improve the efficiency of absorbing landing impact energy, not only considering the variables of aircraft weight and sink speed but also managing uncertainties, such as ambient temperature and passive damping coefficient. To verify the effectiveness of the proposed controller, comparative numerical simulations were performed with a passive damper, a skyhook controller, and the proposed controller under various landing scenarios. The simulation results show that the proposed controller improves the total energy absorber efficiency by up to 10% higher than that of the skyhook controller. In addition, the proposed controller is demonstrated to have better adaptability and robustness than the other control algorithms in the differing landing scenarios and parametric uncertainties.

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