Results 221 to 230 of about 6,575 (259)

Context and Constraint in Presidential Unilateralism

SSRN Electronic Journal, 2011
How should we assess unilateral tactics and their contribution to presidential power in a less-than-unitary executive branch? To explore this question this paper examines the provenance of nearly 300 executive orders from 1947 through 1987. Archival data show that executive orders are frequently a less-than-perfect representation of presidential ...
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Relaxation for a Class of Control Systems with Unilateral Constraints

Acta Applicandae Mathematicae, 2019
The paper is concerned with a nonlinear feedback control system of type \[ \left\{\begin{array}{ll}-x' \in A(x(t))+f(t,x(t))u(t)\\ x(0)=x_0, \quad u(t) \in U(t,x(t))\end{array}\right. \] in a time interval \(T=[0,b]\). Here, \(A:D(A)\subset \mathbb{R}^N \to 2^{\mathbb{R}^N}\) is a maximal monotone mapping and the control constraint multifunction \(U:T ...
Nikolaos S. Papageorgiou, Calogero Vetro, Francesca Vetro   +2 more
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Control of a simple mechanism subject to unilateral constraints

42nd IEEE International Conference on Decision and Control (IEEE Cat. No.03CH37475), 2004
This paper studies statically admissible configurations for a mechanism standing on a horizontal plane (under the action of gravity) subject to mere inequality constraints, which do not inhibit its detachment from the plane and, possibly, its overturn. For a simple case, a strategy to design an admissible control law that drives the mechanism from one ...
GALEANI, SERGIO, MENINI, LAURA, TORNAMBE', ANTONIO   +2 more
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Multibody systems with unilateral constraints

Journal of Applied Mathematics and Mechanics, 2001
The author presents a brief survey of papers which incorporate the complementarity principle [see \textit{J. J. Moreau}, in Trends in applications of pure mathematics to mechanics. Vol. 2, 263--280 (1979; Zbl 0433.73096); \textit{P. D. Panagiotopoulos}, Hemivariantional inequalities. Applications in mechanics and engineering.
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AN EXISTENCE RESULT FOR VIBRATIONS WITH UNILATERAL CONSTRAINTS

Mathematical Models and Methods in Applied Sciences, 2000
We are motivated by the study of dynamical systems with a finite number of degrees of freedom, subject to unilateral convex constraints without loss of energy at impacts. If we denote the set of constraints by K, the motion is described by [Formula: see text], where ψK is the indicatrix function of K.
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Systems Involving Unilateral Constraints

1991
A unilateral constraint is an idealized model of a structural component that limits some linear or angular distance to values either no greater than, or no less than, a certain magnitude. Unlike bilateral constraints, unilateral constraints are binding in only one sense of direction.
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A Unified Approach to Integrate Unilateral Constraints in the Stack of Tasks

IEEE Transactions on Robotics, 2009
The control approaches based on the task function formalism, and particularly those structured as a prioritized hierarchy of tasks, enable complex behaviors with elegant properties of robustness and portability to be built. However, it is difficult to consider a straightforward integration of tasks described by unilateral constraints in such frameworks.
Mansard, Nicolas, Khatib, Oussama, Kheddar, Abderrahmane   +2 more
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Mathematical Results on Existence for Viscoelastodynamic Problems with Unilateral Constraints

SIAM Journal on Mathematical Analysis, 2009
Preprint: Weierstraß-Institut für Angewandte Analysis und Stochastik, vol ...
Petrov, Adrien, Schatzman, Michelle
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Subdifferential Analysis and Plates Subjected to Unilateral Constraints

1989
The problems which lead to study differential properties of functionals which are not smooth, in a classical sense, form a very rich class and may concern very different fields of mathematics.
MARINO, ANTONIO, SACCON, CLAUDIO
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Complementarity Problems and Unilateral Constraints

1990
A simple formalism is proposed that leads to the unified treatment of many problems in Structural Mechanics. Such are the self-adjoint problems of statics of structures made of linear elastic, piecewise-linear elastic, elastic-plastic or rigid-plastic material.
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