Sökning: "Limit cycles"

Visar resultat 1 - 5 av 57 avhandlingar innehållade orden Limit cycles.

  1. 1. Random railways and cycles in random regular graphs

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Hans Garmo; [1998]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Random railway; connectivity number; random regular graph; long cycles; asymptotic distribution. 1991 Mathematics Subject Classification. Primary 60F05; 60C05; 05C38; 05C80; 05C40; 05C45; MATEMATIK; MATHEMATICS; MATEMATIK; matematisk statistik; Mathematical Statistics;

    Sammanfattning : In a cubic multigraph certain restrictions on the paths are made to define what is called a railway. Due to these restrictions a special kind of connectivity is defined. As the number of vertices tends to infinity, the asymptotic probability of obtaining an, in this sense, connected random cubic multigraph is shown to be 1/3. LÄS MER

  2. 2. Some Extensions of Poincaré-Bendixson Theory Applied to a Resonant Converter

    Detta är en avhandling från Numerical Analysis, Lund University

    Författare :Jan Melin; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Datalogi; numerisk analys; system; kontroll; numerical analysis; systems; control; Naturvetenskap; Computer science; Natural science; Poincaré-Bendixson Theory; Limit Cycles; Resonant Converter; Distributions; Piecewise Linear Systems;

    Sammanfattning : In this thesis existence and uniqueness of limit cycles are shown for a resonant converter, by extending Poincaré-Bendixson theory to non-smooth vector fields. We discuss relevant control theory and the role of simulations... LÄS MER

  3. 3. Computer-aided Computation of Abelian integrals and Robust Normal Forms

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Tomas Johnson; Warwick Tucker; Lars-Erik Persson; John H. Hubbard; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ordinary differential equations; parameter estimation; planar Hamiltonian systems; bifurcation theory; Abelian integrals; limit cycles; normal forms; hyperbolic fixed points; numerical integration; invariant manifolds; interval analysis. 2000 Mathematics Subject Classification. 34A60; 34C07; 34C20; 37D10; 37G15; 37M20; 37M99; 65G20; 65L09; 65L70.; MATHEMATICS; MATEMATIK; matematik; Mathematics;

    Sammanfattning : This PhD thesis consists of a summary and seven papers, where various applications of auto-validated computations are studied.In the first paper we describe a rigorous method to determine unknown parameters in a system of ordinary differential equations from measured data with known bounds on the noise of the measurements. LÄS MER

  4. 4. Control Systems with Friction

    Detta är en avhandling från Department of Automatic Control, Lund Institute of Technology (LTH)

    Författare :Henrik Olsson; [1996]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; control engineering; Automatiska system; Automation; robotics; Friction Observer; Friction Compensation; Describing Function Analysis; Limit Cycles; Friction Modeling; Friction; Control Systems; robotteknik; reglerteknik;

    Sammanfattning : Friction-related problems are frequently encountered in control systems. This thesis treats three aspects of such problems: modeling, analysis, and friction compensation. A new dynamic friction model is presented and investigated. LÄS MER

  5. 5. Active Vibration Control of Multibody Systems Application to Automotive Design

    Detta är en avhandling från Uppsala : Institutionen för informationsteknologi

    Författare :Claes Olsson; Alexander Medvedev; Stephen Elliott; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Active Vibration Control; Vibration Isolation; Feedback Control; Adaptive Filtering; Saturation; Limit Cycles; Multi Body Systems; Modelling; Simulation; Non-linearity; Gain Scheduling; Structure Flexibility; TECHNOLOGY Information technology Automatic control; TEKNIKVETENSKAP Informationsteknik Reglerteknik;

    Sammanfattning : Active vibration control to reduce vibrations and structure borne noise is considered using a powerful multi-disciplinary virtual design environment which enables control system design to be considered as an integral part of the overall vehicle design.The main application studied is active automotive engine vibration isolation where, first, the potential of large frequency band multi-input multi-output H2 feedback control is considered. LÄS MER