References of "International Journal of Control"
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See detailFormation control of VTOL UAV vehicles under switching-directed interaction topologies with disturbance rejection
Kabiri, Meisam UL; Hajar, Atrianfar; Mohammad Bagher, Menhaj

in International Journal of Control (2018), 91(1), 33-44

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See detailA New Polytopic Approach for the Unknown Input Functional Observer Design
Bezzaoucha, Souad UL; Voos, Holger UL; Darouach, Mohamed

in International Journal of Control (2017)

In this paper, a constructive procedure to design Functional Unknown Input Observers for nonlin ear continuous time systems is proposed under the Polytopic Takagi-Sugeno framework. An equivalent ... [more ▼]

In this paper, a constructive procedure to design Functional Unknown Input Observers for nonlin ear continuous time systems is proposed under the Polytopic Takagi-Sugeno framework. An equivalent representation for the nonlinear model is achieved using the Sector Nonlinearity Transformation (SNT). Applying the Lyapunov theory and the L2 attenuation, Linear Matrix Inequalities (LMI)s conditions are deduced which are solved for feasibility to obtain the observer design matrices. To cope with the e ffect of unknown inputs, classical approach of decoupling the unknown input for the linear case is used. Both algebraic and solver based solutions are proposed (relaxed conditions). Necessary and su fficient conditions for the existence of the functional polytopic observer are given. For both approaches, the general and particular cases (measurable premise variables, full state estimation with full and reduced order cases) are considered and it is shown that the proposed conditions correspond to the one presented for standard linear case. To illustrate the proposed theoretical results, detailed numerical simulations are presented for a Quadrotor Aerial Robots Landing and a Waste Water Treatment Plant (WWTP). Both systems are highly nonlinear and represented in a T-S polytopic form with unmeasurable premise variables and unknown inputs. [less ▲]

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See detailConvergence of discrete time Kalman filter estimate to continuous time estimate
Aalto, Atte UL

in International Journal of Control (2016), 89(4), 668-679

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See detailOn the classical solution to the linear-constrained minimum energy problem
Schiltz, Jang UL; Boissaux, Marc UL

in International Journal of Control (2012), 1

Minimum energy problems involving linear systems with quadratic performance criteria are classical in optimal control theory. The case where controls are constrained is discussed in Athans and Falb (1966 ... [more ▼]

Minimum energy problems involving linear systems with quadratic performance criteria are classical in optimal control theory. The case where controls are constrained is discussed in Athans and Falb (1966) [Athans, M. and Falb, P.L. (1966), Optimal Control: An Introduction to the Theory and Its Applications, New York: McGraw-Hill Book Co.] who obtain a componentwise optimal control expression involving a saturation function expression. We show why the given expression is not generally optimal in the case where the dimension of the control is greater than one and provide a numerical counterexample. [less ▲]

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