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Browsing by Subject "Linear systems"

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    • Article  

      Adaptive control for a class of large scale non-linear systems 

      Xu, H.; Ioannou, Petros A.; Mirmirani, M. D. (2005)
      The design of stabilizing controllers for multi-input multi-output (MIMO) non-linear plants with unknown non-linearities is a challenging problem. The inability to identify the non-linearities on-line or off-line accurately ...

    • Conference Object  

      Adaptive linear quadratic design with application to F-16 fighter aircraft 

      Huo, Y.; Mirmirani, M.; Ioannou, Petros A.; Colgren, R. (2004)
      This paper investigates an adaptive linear quadratic (ALQ) control design with its application to the longitudinal model of the F-16 fighter aircraft. The certainty equivalence principle is used to combine the adaptive law ...

    • Conference Object  

      Bond graph based modal decomposition of systems with non-proportional damping 

      Louca, Loucas S. (Affiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Street, Nicosia 1678, CyprusCorrespondence Address: Louca, L.S.Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Street, Nicosia 1678, Cyprusemail: lslouca@ucy.ac.cy, 2012)
      Modal analysis of lumped parameter and continuous dynamic linear systems is extensively used to study their dynamic behavior and controller design. In both cases, a reduction of the model size that does not degrade accuracy ...

    • Conference Object  

      Bond graph based modal representations and model reduction of lumped parameter systems 

      Louca, Loucas S. (Affiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Street, Nicosia 1678, CyprusCorrespondence Address: Louca, L.S.Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Street, Nicosia 1678, Cyprusemail: lslouca@ucy.ac.cy, 2006)
      Modal analysis is extensively used to study dynamic behavior of continuous and lumped parameter linear systems. More specifically, modal analysis can be used for the analysis and controller design of dynamic systems. In ...

    • Article  

      Bounds on the size of minimal nonnegative realizations for discrete-time LTI systems 

      Hadjicostis, Christoforos N. (1999)
      Nonnegative linear time-invariant (LTI) state-space models are characterized by the property that their state variables and outputs remain nonnegative whenever the initial state and the inputs are nonnegative. Necessary ...

    • Conference Object  

      Complexity of distributed parameter bond graph models 

      Louca, Loucas S. (The Society for Modeling and Simulation International, 2014)
      Modeling metrics and algorithms that assist the development of dynamic system models are essential for efficient use of modeling and simulation in everyday engineering tasks. Various modeling procedures have been proposed ...

    • Conference Object  

      Control of discrete-time partially-observed jump linear systems over causal communication systems 

      Denic, S. Z.; Charalambous, Charalambos D. (2006)
      We consider the problem of control of discrete-time partially-observed jump linear system over a noisy causal communication channel. Necessary conditions for observability and stabilizability in probability and r-th mean ...

    • Conference Object  

      Control of jump linear systems over jump communication channels - Source-channel matching approach 

      Donic, S. Z.; Charalambous, Charalambos D. (2007)
      The control of partially observed jump linear systems over jump communication channels is investigated when the Plant State Information (I*SI) and the Channel Slate Information (CSI) are present at the transmitter and the ...

    • Conference Object  

      Control of quantized multi-agent systems with linear nearest neighbor rules: A finite field approach 

      Sundaram, S.; Hadjicostis, Christoforos N. (2010)
      We study the problem of controlling a multi-agent system where each agent is only allowed to be in a discrete and finite set of states. Each agent is capable of updating its state based on the states of its neighbors, and ...

    • Conference Object  

      Designing stable inverters and state observers for switched linear systems with unknown inputs 

      Sundaram, S.; Hadjicostis, Christoforos N. (2006)
      We present a method for estimating the inputs and states in discrete-time switched linear systems with unknown inputs. We first investigate the problem of system invertibility, which reconstructs the unknown inputs based ...

    • Conference Object  

      Encoder, controller and decoder design of jump linear systems over jump communication channels 

      Ma, X.; Djouadi, S.; Charalambous, Charalambos D.; Denic, S. (2013)
      In this work, we focus on the encoder, decoder, and controller design for jump linear systems over jump communication channels.The plant state information (PSI) and the channel state information (CSI) are assumed to be ...

    • Conference Object  

      Feedback control over packet dropping network links 

      Mo, H.; Hadjicostis, Christoforos N. (2007)
      This paper studies stabilization schemes for a discrete-time control systems in which the feedback loop includes a network link that may suffer packet drops. We model the packet dropping network link as an erasure channel ...

    • Article  

      Finite Difference Schemes for the Cauchy–Navier Equations of Elasticity with Variable Coefficients 

      Bialecki, B.; Karageorghis, Andreas (2015)
      We solve the variable coefficient Cauchy–Navier equations of elasticity in the unit square, for Dirichlet and Dirichlet-Neumann boundary conditions, using second order finite difference schemes. The resulting linear systems ...

    • Article  

      A Frequency-Based Interpretation of Energy-Based Model Reduction of Linear Systems 

      Louca, Loucas S. (2016)
      Various modeling techniques have been proposed in order to make modeling a more systematic procedure and to facilitate the development of modeling software that provide users, even experienced users, more ease when developing ...

    • Article  

      High performance solution of linear systems arising from conforming spectral approximations for non-conforming domain decompositions 

      Paprzycki, M.; Karageorghis, Andreas (1997)
      We apply a conforming spectral collocation technique to nonconforming domain decompositions. The resulting global matrices have a particular block structure. We study the performance of various direct methods of solution ...

    • Conference Object  

      Information dissemination in networks via linear iterative strategies over finite fields 

      Sundaram, S.; Hadjicostis, Christoforos N. (2009)
      Given an arbitrary network of interconnected nodes, each with an initial value from a discrete set, we consider the problem of distributively disseminating these initial values under the constraint that the nodes can only ...

    • Article  

      A Kansa-Radial Basis Function Method for Elliptic Boundary Value Problems in Annular Domains 

      Liu, X. -Y; Karageorghis, Andreas; Chen, C. S. (2015)
      We employ a Kansa-radial basis function (RBF) method for the numerical solution of elliptic boundary value problems in annular domains. This discretization leads, with an appropriate selection of collocation points and for ...

    • Article  

      Kansa-RBF algorithms for elliptic problems in axisymmetric domains 

      Karageorghis, Andreas; Chen, C. S.; Liu, X. -Y (2016)
      We employ a Kansa-radial basis function method for the numerical solution of elliptic boundary value problems in three-dimensional axisymmetric domains. We consider problems governed by the Poisson equation, the inhomogeneous ...

    • Article  

      A Legendre spectral Galerkin method for the biharmonic Dirichlet problem 

      Bialecki, B.; Karageorghis, Andreas (2001)
      A Legendre spectral Galerkin method is presented for the solution of the biharmonic Dirichlet problem on a square. The solution and its Laplacian are approximated using the set of basis functions suggested by Shen, which ...

    • Article  

      Linearisation and potential symmetries of certain systems of diffusion equations 

      Sophocleous, Christodoulos; Wiltshire, R. J. (2006)
      We consider systems of two pure one-dimensional diffusion equations that have considerable interest in Soil Science and Mathematical Biology. We construct non-local symmetries for these systems. These are determined by ...

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