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"Helicopters Control systems"
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Art of the Helicopter
The modern helicopter is a sophisticated device which merges a surprising number of technologies together.This wide range of disciplines is one of the fascinations of the helicopter, but it is also makes a complete understanding difficult.Those searching for an understanding of the helicopter will find The Art of the Helicopter invaluable.
eBook
Incipient Fault Detection Using an Associated Adaptive and Sliding-Mode Observer for Quadrotor Helicopter Attitude Control Systems
An associated adaptive and sliding-mode observer (AASMO) design is proposed to detect and estimate the incipient actuator faults of a quadrotor. The incipient faults considered are physical structure aging and quadrotor leakage. First, disturbances and nonlinear parameters are considered in system formulation for a realistic mathematical model of the quadrotor. Its fault model is also introduced. Second, the decomposed subsystems are obtained through coordinate transformations to separate the incipient faults from the disturbances. For the subsystem with no disturbance, the adaptive observer can estimate the incipient faults. For the subsystem with disturbances, the sliding-mode observer has strong robustness against the disturbances. Dynamic error convergence and system stability can also be guaranteed by Lyapunov stability theory. Finally, the simulation results of quadrotor helicopter attitude systems validate the efficiency of the proposed AASMO-based incipient fault detection algorithm.
Journal Article
GPS boosts traffic control for urban helicopters. (Global Positioning System)
Global Positioning System (GPS) has enhanced low-altitude urban helicopter traffic control. This was demonstrated during the Atlanta Olympics when 88 Operation Helicopter Short-Haul Transportation and Aviation Research aircraft used GPS to determine positions and air traffic. Aside from tracking, GPS enabled digital communications of weather information and other data between the helicopters and central ground station.
Magazine Article