Journal ArticleDOI
Constrained Control Allocation
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TLDR
In this article, the problem of the allocation of several airplane flight controls to the generation of specified body-axis moments is addressed, and a direct method of allocating these several controls is presented that guarantees the maximum possible moment can be generated within the constraints of the controls.Abstract:
This paper addresses the problem of the allocation of several airplane flight controls to the generation of specified body-axis moments. The number of controls is greater than the number of moments being controlled, and the ranges of the controls are constrained to certain limits. They are assumed to be individually linear in their effect throughout their ranges of motion and independent of one another in their effects. The geometries of the subset of the constrained controls and of its image in moment space are examined. A direct method of allocating these several controls is presented that guarantees the maximum possible moment can be generated within the constraints of the controls. It is shown that no single generalized inverse can yield these maximum moments everywhere without violating some control constraint. A method is presented for the determination of a generalized inverse that satisfies given specifications which are arbitrary but restricted in number. We then pose and solve a minimization problem that yields the generalized inverse that best approximates the exact solutions. The results are illustrated at each step by an example problem involving three controls and two moments.read more
Citations
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Journal ArticleDOI
Modular robust reconfigurable flight control system design for an overactuated aircraft
TL;DR: In this article, a modular approach to the robust reconfigurable flight control system design for an overactuated aircraft is proposed, which consists of three parts: a backstepping controller module, a robust control allocator and an online actuator effectiveness estimator.
Journal ArticleDOI
On a Method of Lagrange Multipliers for Cruise Drag Minimization
Campos Lmbc,Marques Jmg +1 more
TL;DR: In this article, the Lagrange multipliers are used to solve control optimization problems in a blended-wing-body with multiple control surfaces, e.g., to minimize cruise drag due to pitch trim, or to maximize pitching moment at low speed in an engine-out condition.
Proceedings ArticleDOI
On-Line Computation of a Local Attainable Moment Set for Reusable Launch Vehicles
TL;DR: In this paper, the attitude control design of reusable launch vehicles involves independent design of autopilot and control allocation modules, which results in the potential for overly aggressive commands in the autopilot resulting in a loss of performance due to actuator saturation.
Proceedings ArticleDOI
Enhancing the actuator fault tolerance in autonomous overactuated vehicles via adaptive control allocation
TL;DR: In this paper, an adaptive actuator allocation scheme that is fault-tolerant with respect to actuator faults and loss of effectiveness is presented, which uses an ad-hoc online parameter estimator coupled with an allocation algorithm to perform on-line control reconfiguration whenever necessary.
Journal ArticleDOI
New control allocation algorithms in fixed point framework for overactuated systems with actuator saturation
TL;DR: Two control allocation algorithms have been proposed for overactuated systems by formulating constrained control allocation problem into an equivalent fixed point framework and one involves a zero finding technique by the Newton method.
References
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Book
Modern Control Theory
TL;DR: The relationship between state variable and transfer function descriptions of linear feedback control systems is discussed in this paper, along with the relationship between the Cayley Hamilton Theorem and state variable descriptions of systems.
Journal ArticleDOI
Nonlinear inversion flight control for a supermaneuverable aircraft
TL;DR: In this article, the authors discuss the use of nonlinear dynamic inversion in the design of a flight control system for a Superman aircraft and compare it with a more conventional, gain-scheduled system and yield better performance in terms of lateral acceleration, sideslip, and control deflections.
Relative control effectiveness technique with application to airplane control coordination
TL;DR: In this paper, a method to select optimal combinations of the control variables of a linear system is reported, where the combinations are chosen so that the control channels have their principal influences on selected fundamental modes of the system.
Preliminary design study of a lateral-directional control system using thrust vectoring
TL;DR: In this article, a preliminary design of a lateral-directional control system for a fighter airplane capable of controlled operation at extreme angles of attack is developed, which is representative of a modern twin-engine high-performance jet fighter, equipped with ailerons, rudder, and independent horizontal-tail surfaces.