Comportamiento sísmico de edificios con un sistema no linel de control híbrido (2009)
Rodellar, José, Barbat, Álex H. (Álex Horia), Ryan, E. P., Molinares, N.
En el artículo se propone una clase de sistema hi33rido de control antisísmico de edificios que combina un sistema pasivo de aislamiento de base con comportamiento no lineal con uno , activo. La...
Comportamiento sísmico de edificios con un sistema no linel de control híbrido (2009)
Rodellar, José, Barbat, Álex H. (Álex Horia), Ryan, E. P., Molinares, N.
En el artículo se propone una clase de sistema hi33rido de control antisísmico de edificios que combina un sistema pasivo de aislamiento de base con comportamiento no lineal con uno , activo. La...
Ryan, E. P., Sangwin, C. J., Townsend, P.
A tracking problem is considered in the context of a class S of multi-input, multi-output, nonlinear systems modelled by controlled functional differential equations. The class contains, as a...
Adaptive Low-Gain Integral Control of Linear Systems with Input and Output Nonlinearities (2008)
T. Fliegner, H. Logemann, E. P. Ryan
An adaptive low-gain integral control framework is developed for tracking constant reference signals in a context of finite-dimensional, asymptotically stable, single-input, single-output linear...
Meagre functions and asymptotic behaviour of dynamical systems, Nonlinear Analysis: Theory (2007)
W. Desch, H. Logemann, E. P. Ryan, Bath Ba Ay, E. D. Sontag
Abstract. A measurable function x: J ae R! X (X a metric space) is said to be C-meagre if C ae X is non-empty and, for every closed set K ae X with K " C =;, x \Gamma1 (K) has finite...
A lemma of Razumikhin type, pertaining to boundedness of solutions of functional differential equations, is presented. This lemma is subsequently invoked in the analysis of adaptive strategies that...
Absolute Stability and Integral Control (2007)
T. Fliegner, H. Logemann, E. P. Ryan
Absolute stability results of both circle criterion and Popov type are derived for nite-dimensional linear plants with nonlinearity in the feedback loop. The linear plant contains an integrator (and...
Robustness in the Graph Topolgy of a Common Adaptive Controller (2006)
French, M., Ilchmann, A., Ryan, E.P.
For any $m$-input, $m$-output, finite-dimensional, linear, minimum-phase plant $P$ with first Markov parameter having spectrum in the open right-half complex plane, it is well known that the adaptive...
Robustness in the Graph Topolgy of a Common Adaptive Controller (2006)
French, M., Ilchmann, A., Ryan, E.P.
For any $m$-input, $m$-output, finite-dimensional, linear, minimum-phase plant $P$ with first Markov parameter having spectrum in the open right-half complex plane, it is well known that the adaptive...
Robustness in the Graph Topolgy of a Common Adaptive Controller (2006)
French, M., Ilchmann, A., Ryan, E.P.
For any $m$-input, $m$-output, finite-dimensional, linear, minimum-phase plant $P$ with first Markov parameter having spectrum in the open right-half complex plane, it is well known that the adaptive...
Non-Autonomous Systems: Asymptotic Behaviour and Weak Invariance Principles (2003)
INTRODUCTION The initial-value problem for a non-autonomous ordinary dierential equations of the form _ x = f(t; x), x(0) = is considered, where f is of Caratheodory class (and so the initial-value...
Meagre Functions and Asymptotic Behaviour of Dynamical Systems (2001)
W. Desch, H. Logemann, E. P. Ryan, E.D. Sontag
A measurable function x : J ae R! X (X a metric space) is said to be C-meagre if C ae X is non-empty and, for every closed set K ae X with K " C = ;, x \Gamma1 (K) has finite Lebesgue measure....
Discrete-Time Low-Gain Control of Linear Systems with Input/Output Nonlinearities (1999)
T. Fliegner, H. Logemann, E. P. Ryan
: Discrete-time low-gain control strategies are presented for tracking of constant reference signals for nite-dimensional, discrete-time, power-stable, single-input, single-output, linear systems...
H. Logemann, E. P. Ryan, S. Townley
: Closing the loop around an exponentially stable single-input single-output regular linear system, subject to a globally Lipschitz and non-decreasing actuator nonlinearity and compensated by an...
T. Fliegner, H. Logemann, E. P. Ryan
: Continuous-time low-gain integral control strategies are presented for tracking of constant reference signals for nite-dimensional, continuous-time, asymptotically stable, single-input...
Abstract. The Byrnes-Martin integral invariance principle for ordinary differential equations is extended to differential inclusions on R N. The extended result is applied in demonstrating the...
. Closing the loop around an exponentially stable, single-input, single-output, regular, linear system -- subject to a globally Lipschitz, non-decreasing actuator nonlinearity and compensated by an...
: Discrete-time low-gain control strategies are presented for tracking of constant reference signals for innite-dimensional, discrete-time, power-stable, linear systems subject to input...
Integral Control of Infinite-Dimensional Linear Systems Subject to Input Saturation (1997)
H. Logemann, E. P. Ryan, S. Townley
: Closing the loop around an exponentially stable single-input single-output regular linear system, subject to a globally Lipschitz and non-decreasing actuator nonlinearity and compensated by an...
Suboptimal Control of Rigid Body Motion with a Quadratic Cost (1995)
Mario A. Rotea, Panagiotis Tsiotras, Martin Corless, E. P. Ryan
. In this paper we consider the problem of controlling the rotational motion of a rigid body using three independent control torques. Given a quadratic cost we seek stabilizing state feedback...
Suboptimal Control of Rigid Body Motion with a Quadratic Cost (1995)
Abstract. In this paper we consider the problem of controlling the rotational motion of a rigid body using three independent control torques. Given a quadratic cost we seek stabilizing state feedback...
Feedback Stabilization of a Class of Nonlinearly Coupled Uncertain Dynamical Systems (1991)
A class of discontinuous feedback controls is presented which guarantees global asymptotic stability of the zero state for a class of nonlinearly coupled uncertain dynamical systems, modelled by a...
Optimal Discontinuous Feedback Controls for Linear Systems (1985)
The synthesis of optimal feedback controls for linear systems with constrained inputs is studied. An integral cost is minimized, the integrand being the sum of a quadratic state penalty term, a...
Based on concepts from both the theory of variable structure systems and the theory of Leitmann et al., continuous and discontinuous feedback controls are developed which guarantee uniform ultimate...
Optimal relay and saturating control system synthesis / E. P. Ryan (1982)
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T. Fliegner, H. Logemann, E. P. Ryan
Time-varying low-gain integral control strategies are presented for asymptotic tracking of constant reference signals in the context of exponentially stable, well-posed, linear, infinite-dimensional,...