Author: Magnus BichlmeierPublisher:
ISBN: 9783736992818
Category :
Languages : en
Pages : 248
Book Description
Certifiable L1 Adaptive Control for Helicopters
Author: Magnus BichlmeierPublisher:
ISBN: 9783736992818
Category :
Languages : en
Pages : 248
Book Description
Development and Application of One-step-ahead Adaptive Control System for Helicopters
Author: Lorenzo DambrosioPublisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 242
Book Description
Design of a Helicopter Automatic Flight Control System Using Adaptive Control
Author: Philip Matthew FitzsimonsPublisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 370
Book Description
Adaptive Control of Autonomous Helicopters
Author: Yipin ChenPublisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 166
Book Description
Two New Extensions to L1 Adaptive Control Theory
Author: Nonlinear and Adaptive Control of Model Helicopter
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 117
Book Description
A helicopter is a complex nonlinear system and also an under actuated system with fewer independent control actuators than degrees of freedom to be controlled, making the control difficult. There is a growing interest in the modeling and control of such systems using nonlinear dynamic models and nonlinear control. Analytical techniques based on Lyapunov theory are then used to design the controller and still the design can become extremely complex. Hence the existing control methods use linearization techniques on the actual nonlinear dynamics of the plant and linear control techniques. The resulting performance may not be satisfactory, especially when the system is subjected to unknown and sudden disturbances. In this thesis, we present a new Nonlinear and Adaptive controller design which uses the actual nonlinear model of the helicopter and not a linearized version. The design methodology basically involves making the combined dynamics of the helicopter and the controller resemble the dynamics of a nonlinear time varying electrical circuit having the required properties using a process similar to reverse engineering. The circuit template in turn is formed from well defined time varying and/or nonlinear electrical elements and using proper interconnections. The kind of elements used and the general form of the dynamics derived will depend upon the application. For example in the helicopter case, the closed loop dynamics of the helicopter and the controller expressed in terms of the error variable should point to a NLTV circuit with only passive elements. For this, the reactive elements should have their relaxation points (the points where the stored energy is zero) at and only at the origin. Also the stored energy should be monotonically increasing. We can bring in any knowledge including the structure that we have about the plant being controlled in enhancing the circuit.
Adaptive control of helicopter vibrations via theimpulse response method
Author: Carl Richard KnospeScientific and Technical Aerospace Reports
Author: Augmenting L1 Adaptive Control of Piecewise Constant Type to Aerial Vehicles
Author: The Extension of an Adaptive Aircraft Control Concept to Helicopters
Author: John McCoy Hood (Jr)Publisher:
ISBN:
Category :
Languages : en
Pages : 59
Book Description
A basic adaptive control scheme for fixed-wing aircraft was modified for use in controlling the longitudinal motion of helicopters. The modification required the addition of two additional feedback variables. Control was applied only to the cyclic pitch input and not to the collective input. It was assumed that a coefficient, the cyclic-pitch control effectiveness, would not change sign throughout the flight envelope. Analog computer simulation showed that the modified system was capable of stabilizing the model used. The handling qualities of the system were not completely satisfactory and further work is necessary. (Author).