449 research outputs found
Port-Hamiltonian systems on discrete manifolds
This paper offers a geometric framework for modeling port-Hamiltonian systems
on discrete manifolds. The simplicial Dirac structure, capturing the
topological laws of the system, is defined in terms of primal and dual cochains
related by the coboundary operators. This finite-dimensional Dirac structure,
as discrete analogue of the canonical Stokes-Dirac structure, allows for the
formulation of finite-dimensional port-Hamiltonian systems that emulate the
behaviour of the open distributed-parameter systems with Hamiltonian dynamics.Comment: MATHMOD 2012 - 7th Vienna International Conference on Mathematical
Modellin
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Nordic Electricity Congestion's Arrangement as a Model for Europe: Physical Constraints or Operators' Opportunity
Nordic Electricity Congestion's Arrangement as a Model for Europe: Physical Constraints or Operators' Opportunit
Definition of Power Converters
The paper is intended to introduce power conversion principles and to define
common terms in the domain. The concepts of sources and switches are defined
and classified. From the basic laws of source interconnections, a generic
method of power converter synthesis is presented. Some examples illustrate this
systematic method. Finally, the commutation cell and soft commutation are
introduced and discussed.Comment: 29 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
Bounded Disturbance Amplification for Mass Chains with Passive Interconnection
This paper introduces the problem of passive control of a chain of N
identical masses in which there is an identical passive connection between
neighbouring masses and a similar connection to a movable point. The problem
arises in the design of multi-storey buildings which are subjected to
earthquake disturbances, but applies in other situations, for example vehicle
platoons. The paper studies the scalar transfer functions from the disturbance
to a given intermass displacement. It is shown that these transfer functions
can be conveniently represented in the form of complex iterative maps and that
these maps provide a method to establish boundedness in N of the H-infinity
norm of these transfer functions for certain choices of interconnection
impedance
3 sampled-data control of nonlinear systems
This chapter provides some of the main ideas resulting from recent developments in sampled-data control of nonlinear systems. We have tried to bring the basic parts of the new developments within the comfortable grasp of graduate students. Instead of presenting the more general results that are available in the literature, we opted to present their less general versions that are easier to understand and whose proofs are easier to follow. We note that some of the proofs we present have not appeared in the literature in this simplified form. Hence, we believe that this chapter will serve as an important reference for students and researchers that are willing to learn about this area of research
Structure-Preserving Discretization of a Coupled Heat-Wave System, as Interconnected Port-Hamiltonian Systems
The heat-wave system is recast as the coupling of port-Hamiltonian subsystems (pHs), and discretized in a structure-preserving way by the Partitioned Finite Element Method (PFEM) (Cardoso-Ribeiro, 2021). Then, depending on the geometric configuration of the two domains, different asymptotic behaviours of the energy of the coupled system can be recovered at the numerical level, assessing the validity of the theoretical results of (Zhang and Zuazua, 2007)
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