Article
Nonsmooth Modeling and Simulation for Switched Circuits
01/2010; DOI: 10.1007/9789048196814
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ABSTRACT: In this work we study the following problem: given a numerical method (an extended $\theta $ θ method named the $(\theta , \gamma )$ ( θ , γ ) method), find the class of dissipative linear complementarity systems such that their discretetime counterpart is still dissipative, with the same storage (energy) function, supply rate (reciprocal variables), and dissipation function. Systems with continuous solutions, and with state jumps are studied. The notion of numerical dissipation is given a rigorous meaning.Numerische Mathematik 12/2013; · 1.33 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In this paper, we analyze and discuss the wellposedness of two newvariants of the socalled sweeping process, introduced by Moreau in the early 70s (Moreau in Sém Anal Convexe Montpellier, 1971) with motivation in plasticity theory. The first new variant is concerned with the perturbation of the normal cone to the moving convex subset C(t), supposed to have a bounded variation, by a Lipschitz mapping. Under some assumptions on the data, we show that the perturbed differential measure inclusion has one and only one right continuous solution with bounded variation. The second variant, for which a large analysis is made, concerns a first order sweeping process with velocity in the moving set C(t). This class of problems subsumes as a particular case, the evolution variational inequalities [widely used in applied mathematics and unilateral mechanics (Duvaut and Lions in Inequalities in mechanics and physics. Springer, Berlin, 1976]. Assuming that the moving subset C(t) has a continuous variation for every t ∈ [0, T ] with C(0) bounded, we show that the problem has at least a Lipschitz continuous solution. The wellposedness of this class of sweeping process is obtained under the coercivity assumption of the involved operator.We also discuss some applications of the sweeping process to the study of vector hysteresis operators in the elastoplastic model (Krejˇcı in Eur J Appl Math 2:281–292, 1991), to the planning procedure inmathematical economy (Henry in J Math Anal Appl 41:179– 186, 1973 and Cornet in J. Math. Anal. Appl. 96:130–147, 1983), and to nonregular electrical circuits containing nonsmooth electronic devices like diodes (Acary et al. Nonsmooth modeling and simulation for switched circuits. Lecture notes in electrical engineering. Springer, New York 2011). The theoretical results are supported by some numerical simulations to prove the efficiency of the algorithm used in the existence proof.Our methodology is based only on tools from convex analysis. Like other papers in this collection, we show in this presentation how elegant modern convex analysis was influenced by Moreau’s seminal work.Mathematical Programming 02/2014; · 2.09 Impact Factor
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