Lagrangian and Hamiltonian Theory

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Author Index
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S T U V W X Y Z

Hamiltonian Extensions, Hilbert Adjoints and Singular Value Functions for Nonlinear Systems

Authors:

Jacquelien M.A. Scherpen, Kenji Fujimoto, W. Steven Gray,

Volume: 1, Page 5102 Paper number 1287

Abstract:

This paper studies previously developed nonlinear Hilbert adjoint operator theory from a variational point of view and provides a formal justification for the use of Hamiltonian extensions via Gateaux differentials. The primary motivation is its use in characterizing singular values of nonlinear operators, and in particular, the Hankel operator and its relationship to the state space notion of nonlinear balanced realizations.

CD001287.PDF (From Author)

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Geometric Scattering in Telemanipulation of Generalised Port Controlled Hamiltonian Systems

Authors:

S. Stramigioli, A.V.D. Schaft, B. Maschke, S. Andreotti, C. Melchiorri,

Volume: 1, Page 5108 Paper number 1258

Abstract:

In this paper we study the interconnection of two port controlled Hamiltonian systems through a transmission line with delay. The contributions of the paper are firstly a geometrical, multi-dimensional, power consistent exposition of tele-manipulation of Intrinsically Passive Controlled (IPC) physical systems (Stramigioli 1998), with a clarification on impedance matching, and secondly a system theoretic condition for the adaptation of a general port controlled Hamiltonian system with dissipation (PCHD system) to a transmission line. To the knowledge of the authors, the latter result in particular has never appeared in such a general form. Experimental results on an Internet implementation are also presented.

CD001258.PDF (From Author)

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Uniqueness of Solutions for Control Systems with Degenerate Lagrangians

Authors:

Karel Volckaert, Dirk Aeyels,

Volume: 1, Page 5114 Paper number 1270

Abstract:

We outline a method for dealing with controlled mechanical systems with degenerate Lagrangians, or singular optimal control problems with degenerate cost functions. We show how consistent equations of motion can be obtained despite the -- implicit -- constraint of degeneracy, and state conditions on which the system exhibits unique solutions (on a reduced phase space). This method is adopted from results in classical mechanics, viz. the Gotay-Nester-Hinds algorithm for the resolution of constraints in presymplectic systems. We illustrate with an example from singular linear optimal control theory.

CD001270.PDF (From Author)

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The Category Of Affine Connection Control Systems

Authors:

Andrew D. Lewis,

Volume: 1, Page 5119 Paper number 1645

Abstract:

The category of affine connection control systems is one whose objects are control systems whose drift vector field is the geodesic spray of an affine connection, and whose control vector fields are vertical lifts to the tangent bundle of vector fields on configuration space. We initiate an investigation of morphisms (feedback transformations) in this category, including the study of subsystems and factor systems.

CD001645.PDF (From Author)

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On the Development of Generalized Hamiltonian Realizations

Authors:

Daizhan Cheng, Sarah K. Spurgeon, Jianping Xiang,

Volume: 1, Page 5125 Paper number 8019

Abstract:

The generalized Hamiltonian realization problem is discussed in this paper. Three kinds of realizations are investigated. The first is the generalized Hamiltonian realization of a dynamic system. As an example, the excitation control system [4] is investigated. The feedback dissipative realization of controlled Hamiltonian systems is then considered. A necessary and sufficient condition for existence of this realization is obtained. Finally, the approximate realization is considered. A normal form result is implemented to provide certain computable conditions.

CD008019.PDF (From Author)

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