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Robust Nonlinear Control of Tailless Fighter Aircraft

Author : Andrew Teel

Publisher :

Page : 19 pages

File Size : 24,97 MB

Release : 1999

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Book Description

Tools that lead to effective control strategies for tailless fighter aircraft were developed. Emphasis was placed on the development of control algorithms that yield robust performance in the presence of actuator magnitude and rate limits and that account for the interaction of a pilot with the airframe and control system. Numerous new analysis tools for nonlinear control systems were developed, with an emphasis on disturbance attenuation and sampled data control. Previously developed algorithms for control (especially anti-windup control) in the presence of actuator rate and magnitude limits were extended. The algorithms were applied to the manual flight control problem for open loop unstable fighter aircraft.



Robust Nonlinear Control of Tailless Aircraft

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Publisher :

Page : 19 pages

File Size : 16,40 MB

Release : 1999

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The objective of this research was to develop tools leading to effective control strategies for tailless fighter aircraft. Emphasis was placed on the development of control algorithms that yield robust performance in the presence of actuator magnitude and rate limits and that account for the interaction of a pilot with the airframe and control system. The results of this research are documented in the 22 papers that are listed in this report. These papers present the development of numerous new analysis tools for nonlinear control systems with an emphasis on disturbance attenuation and sampled data control. These algorithms were applied to the manual flight control problem for open loop unstable fighter aircraft.



Robust Nonlinear Control of Piloted Tailless Fighters

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Page : 0 pages

File Size : 39,11 MB

Release : 1999

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The theme of this research has been to develop effective strategies for the design and analysis of flight control systems for tailless fighter aircraft. In our quest to understand the fundamental issues in the aggressive maneuvering of high performance fighter aircraft, we have developed tools and techniques, and the appropriate supporting theoretical results, for the study and analysis of high performance maneuvering systems. We have developed a simplified flight dynamics model, the coordinated flight vehicle (CFV). Exploiting the geometric structure of the CFV, one may easily explore the space of aggressive flight maneuvers. We have developed an optimization based, trajectory morphing technique by which CFV maneuvers may be used to parametrize the achievable flight maneuvers (i.e., maneuvers that satisfy given high fidelity aircraft model dynamics). We have also developed theory and algorithms to allow these model based optimization techniques to used online, in a receding horizon fashion. As a theoretical bonus, we have obtained new results on the structure of the trajectory manifold of a nonlinear system.



Robust Multivariable Flight Control

Author : Richard J. Adams

Publisher : Springer Science & Business Media

Page : 175 pages

File Size : 15,24 MB

Release : 2012-12-06

Category : Technology & Engineering

ISBN : 1447121112

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Book Description

Manual flight control system design for fighter aircraft is one of the most demanding problems in automatic control. Fighter aircraft dynamics generally have highly coupled uncertain and nonlinear dynamics. Multivariable control design techniques offer a solution to this problem. Robust Multivariable Flight Control provides the background, theory and examples for full envelope manual flight control system design. It gives a versatile framework for the application of advanced multivariable control theory to aircraft control problems. Two design case studies are presented for the manual flight control of lateral/directional axes of the VISTA-F-16 test vehicle and an F-18 trust vectoring system. They demonstrate the interplay between theory and the physical features of the systems.



Robust Nonlinear Control of Vectored Thrust Aircraft

Author : National Aeronautics and Space Administration (NASA)

Publisher : Createspace Independent Publishing Platform

Page : 44 pages

File Size : 18,16 MB

Release : 2018-07-11

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ISBN : 9781722746360

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Book Description

An interdisciplinary program in robust control for nonlinear systems with applications to a variety of engineering problems is outlined. Major emphasis will be placed on flight control, with both experimental and analytical studies. This program builds on recent new results in control theory for stability, stabilization, robust stability, robust performance, synthesis, and model reduction in a unified framework using Linear Fractional Transformations (LFT's), Linear Matrix Inequalities (LMI's), and the structured singular value micron. Most of these new advances have been accomplished by the Caltech controls group independently or in collaboration with researchers in other institutions. These recent results offer a new and remarkably unified framework for all aspects of robust control, but what is particularly important for this program is that they also have important implications for system identification and control of nonlinear systems. This combines well with Caltech's expertise in nonlinear control theory, both in geometric methods and methods for systems with constraints and saturations. Doyle, John C. and Murray, Richard and Morris, John Unspecified Center NAG2-792...



Model Predictive Control Synthesis for the Innovative Control Effector Tailless Fighter Aircraft

Author : Christopher Charles Proctor

Publisher :

Page : 72 pages

File Size : 50,60 MB

Release : 2019

Category : Airplanes

ISBN :

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Book Description

A nonlinear model predictive control law was developed for the Lockheed Martin Innovative Control Effector tailless fighter aircraft to track way points. In general, aircraft are described by nonlinear dynamics that are dependent on the regime of flight. Additionally strict requirements on state and actuator constraints are common to all aircraft. Tailless aircraft are usually overdetermined systems, meaning solutions to control problems are not unique, and the system is non-affine. The proposed nonlinear control law considers those constraints during run-time, and solves the nonlinear control problem for a range of points within different flight regimes. The control law was developed using a computer simulation of the tailless fighter aircraft, and further simulation was used to validate the control law when applied to the aircraft. It was found that the controller was able to track reference step commands in altitude anywhere from sea level to 50,000 ft and remain stable. It is also shown that the single nonlinear controller is able to handle lateral translations at the same time as altitude commands, demonstrating its authority over the entire 6 degree of freedom system. The controller is not real time applicable but research indicates that it is possible to apply such a technique in real time. It was concluded that nonlinear model predictive control is a viable control synthesis technique for tailless fighter aircraft if real-time algorithms can be developed.



Nonlinear Control of Fighter Aircraft

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Publisher :

Page : 131 pages

File Size : 42,74 MB

Release : 1999

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Book Description

The problem of designing flight control systems for high performance tailless fighter aircraft is discussed in the report. The research uses linear matrix inequalities and semidefinite programming to addresses three areas of tailless fighter flight control. The first area investigates H2 and Hinf controller design using linear matrix inequalities. The second area uses linear matrix inequalities and linear parameter varying models to develop stability analysis tools for gain scheduled and reconfigurable control laws. The third area focused on using linear matrix inequalities to design aeroservoelastic fitters.



Robust Multivariable Flight Control

Author : Richard J. Adams

Publisher : Springer

Page : 164 pages

File Size : 23,85 MB

Release : 1994-10-14

Category : Technology & Engineering

ISBN : 9783540199069

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Book Description

Manual flight control system design for fighter aircraft is one of the most demanding problems in automatic control. Fighter aircraft dynamics generally have highly coupled uncertain and nonlinear dynamics. Multivariable control design techniques offer a solution to this problem. Robust Multivariable Flight Control provides the background, theory and examples for full envelope manual flight control system design. It gives a versatile framework for the application of advanced multivariable control theory to aircraft control problems. Two design case studies are presented for the manual flight control of lateral/directional axes of the VISTA-F-16 test vehicle and an F-18 trust vectoring system. They demonstrate the interplay between theory and the physical features of the systems.





Robust Nonlinear Aircraft Flight Control

Author : James M. Buffington

Publisher :

Page : 70 pages

File Size : 28,99 MB

Release : 2001

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ISBN :

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Book Description

This project addresses the development of both control synthesis and analysis methods for affordable, highly integrated nonlinear aircraft control systems through basic research and development of control science and dynamical systems theory. The technical approach is to explore the following three primary research areas: (1) stability analysis, (2) robust nonlinear control, and (3) robust reconfigurable control. The stability analysis task assesses robustness of a baseline flight control system. The analysis results are used to develop on-board model and control allocation requirements for the other two tasks. The robust nonlinear control task includes development of compact on-board model and dynamic control allocation synthesis methods. The reconfigurable control design task includes development of an on-board model update synthesis method. The main accomplishment for the stability analysis task is using structured singular value analysis to formalize control allocation stability implications and to specify stability and control derivative accuracy requirements for on-board model synthesis. The main accomplishments for the robust nonlinear control design task are development of a dynamic control allocation formulation and development of a compact on-board model synthesis method. The main accomplishment for the robust reconfigurable control design task is the development of an on-line learning method for on-board model updates to enhance the robustness of indirect adaptive flight control systems.