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Träfflista för sökning "WAKA:rap ;pers:(Glad Torkel 1947)"

Sökning: WAKA:rap > Glad Torkel 1947

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1.
  • Fliess, Michel, et al. (författare)
  • An Algebraic Approach to Linear and Nonlinear Control
  • 1994
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The analysis and design of control systems has been greatly influenced by the mathematical tools being used. Maxwell introduced linear differential equations in the 1860’s. Nyquist, Bode and others started the systematic use of tranfer functions, utilizing complex analysis in the 1930’s. Kalman brought forward state space analysis around 1960. For nonlinear systems, differential geometric concepts have been of great value recently. We will argue here that algebraic methods can be very useful for both linear and nonlinear systems. To give some motivation we will begin by looking at a few examples.
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2.
  • Forsman, Krister, et al. (författare)
  • Constructive Algebra and Control Theory
  • 1993
  • Ingår i: Proceedings of the 1993 International Symposium on The Mathematical Theory of Networks and Systems. - Linköping : Linköping University. - 9783055016615 ; , s. 149-152
  • Rapport (övrigt vetenskapligt/konstnärligt)
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4.
  • Gerdin, Markus, et al. (författare)
  • Global Identifiability of Complex Models, Constructed from Simple Submodels
  • 2007
  • Ingår i: Modeling, Estimation and Control. - Linköping : Linköping University Electronic Press. - 9783540735694 ; , s. 123-133
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • It is a typical situation in modern modeling that a total model is built up from simpler submodels, or modules, for example residing in a model library. The total model could be quite complex, while the modules are well understood and analysed. A procedure to decide global parameter identifiability for such a collection of model equations of differential-algebraic nature is suggested. It is shown how to make use of the natural modularization of the model structure. Basically, global identifiability is obtained if and only if each module is identifiable, and the connecting signals can be retrieved from the external signals, without knowledge of the values of the parameters.
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5.
  • Gerdin, Markus, et al. (författare)
  • On Identifiability of Object-Oriented Models
  • 2005
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • When estimating unknown parameters, it is important that the model is identifiable so that the parameters can be estimated uniquely. For nonlinear differential-algebraic equation models with polynomial equations, a differential algebra approach to examine identifiability is available. This approach can be slow, so the present paper describes how this method can be modularized for object-oriented models. A characteristic set of equations is computed for components in model libraries, and stored together with the components. When an object-oriented model is built using such models, identifiability can be examined using the stored equations.
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6.
  • Germundsson, Roger, et al. (författare)
  • A Unified Constructive Study of Linear, Nonlinear and Discrete Event Systems
  • 1995
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Starting from the behavioral point of view a system is defined by its set of behaviors. In discrete time this is a relation over D N and hence a very infinite object. A model is a relation over D N for some finite N that can be extended to a behavior. Furthermore properties of a system is defined in terms of its behavior. Starting from a constructive point of view we need to be able to represent and manipulate systems. A natural choice is to use some a constructive model, i.e. one that can be finitely represented and manipulated. We will consider four such classes of models: polynomial and linear relations over finite and infinite fields. There are a number of restrictions on the geometric (or behavioral) operations that are possible for each of these classes and still remain within the class. If we want to interpret our models as systems and analyze system properties, then several properties become impossible to compute. Some examples: The set of reachable states for a polynomial model over an infinite field is in general impossible to compute. It may converge to be fractal. The set of reacable states ik steps or less in a linear model cannot be represented as a linear set in general.
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9.
  • Glad, Torkel, 1947- (författare)
  • Analysis of Actuator Cross Coupling in Aircraft
  • 1999
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • When several control signals share the same physical actuators, actuator saturation has the effect of giving coupling between control loops which are otherwise decoupled. This effect occurs e.g. in aircraft control where the elevator and aileron functions often use the same physical control surfaces. The effect is particularly important when one of the loops is open loop unstable. The paper consider the effects on the stabilizable region of cross coupling with another control loop. To give further insight simple optimal control problems are considered.
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