Journal ArticleDOI
Constrained Control Allocation
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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
A chattering-free sliding-mode controller for underwater vehicles with fault- tolerant infinity-norm thrust allocation
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Bayesian Nonparametric Adaptive Control Using Gaussian Processes
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Lateral motion control for four-wheel-independent-drive electric vehicles using optimal torque allocation and dynamic message priority scheduling
TL;DR: In this paper, a quadratic programming (QP) based torque allocation algorithm is proposed with the advantage of equally and reasonably utilizing the tire-road friction of each wheel, and a mechanism to effectively utilize the limited network bandwidth resources and attenuate the adverse impact of in-vehicle network-induced time-delays is proposed.
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Fault tolerant control allocation using unknown input observers
TL;DR: The proposed approach consists in tuning the observer parameters in order to make the filters decoupled from faults affecting selected groups of actuators or effectors affected by control reconfiguration in overactuated systems.
Journal ArticleDOI
Closed-form solutions to constrained control allocation problem
TL;DR: This paper describes the results of recent research into the problem of allocating several flight control effectors to generate moments acting on a flight vehicle using various generalized inverse solutions and a hybrid solution utilizing daisy chaining.
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.