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
Robust finite-time control allocation in spacecraft attitude stabilization under actuator misalignment
Qinglei Hu,Bo Li,Aihua Zhang +2 more
TL;DR: In this paper, a novel combination of finite time control and control allocation with uncertain configuration matrix due to actuator misalignment is investigated for attitude stabilization of a rigid spacecraft, where a robust least squares-based control allocation is employed to deal with the problem of distributing the three axis torques over the available actuators under redundancy, under the condition of the uncertainty included in actuator configuration matrix and control constraints like saturation.
Journal ArticleDOI
Command limiting in reconfigurable flight control
Marc Bodson,William Pohlchuck +1 more
TL;DR: In this paper, model reference adaptive control algorithms are considered for flight control reconfiguration and four methods are proposed to handle the problems arising due to actuator saturation in a twin-engine fighter aircraft.
PatentDOI
Computationally efficient control allocation
TL;DR: In this paper, a computationally efficient method for calculating near-optimal solutions to the three-objective, linear control allocation problem is disclosed, which is measured by the number of floating-point operations required for solution.
Journal ArticleDOI
Aircraft Spin Recovery, with and without Thrust Vectoring, Using Nonlinear Dynamic Inversion
TL;DR: In this paper, the problem of spin recovery of an aircraft was addressed as a nonlinear inverse dynamics problem of determining the control inputs that need to be applied to transfer the aircraft from a spin state to a level trim flight condition.
Journal ArticleDOI
Modeling and Incremental Nonlinear Dynamic Inversion Control of a Novel Unmanned Tiltrotor
TL;DR: In this article, an incremental nonlinear dynamic inversion technique was used to solve the problem of the nonlinear dynamics model not being control affine due to effector redundancy, dramatic nonlinearities and cross-coupling effects introduced by the use of thrust vectoring during hover and transition phases.
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.