Sökning: "stability parameter"

Visar resultat 1 - 5 av 157 avhandlingar innehållade orden stability parameter.

  1. 1. Numerical investigation of self-excited vibrations of a compressor cascade

    Detta är en avhandling från Stockholm : Energiteknik

    Författare :Moosa Muhammad; KTH.; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flutter; turbomachinery; compressor blade; CFD; stability; aerodynamic damping; stability parameter; modeshape; TECHNOLOGY Engineering mechanics Mechanical and thermal engineering Mechanical energy engineering; TEKNIKVETENSKAP Teknisk mekanik Mekanisk och termisk energiteknik Mekanisk energiteknik;

    Sammanfattning : .... LÄS MER

  2. 2. Effects of warming and nutrient enrichment on feeding behavior, population stability and persistence of consumers and their resources

    Detta är en avhandling från Umeå : Umeå University

    Författare :Wojciech Uszko; Umeå universitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; consumer-resource; Daphnia; functional response; nutrient enrichment; parameter estimation; persistence; plankton; predator-prey; stability; temperature; type II; type III; warming;

    Sammanfattning : Consumer-resource interactions are the basic building blocks of every food web. In spite of being a central research theme of longstanding interest in ecology, the mechanisms governing the stability and persistence of consumer-resource interactions are still not entirely understood. LÄS MER

  3. 3. Nyquist Stability Analysis of a VSC-HVDC System with a Distributed Parameter DC-cable Model

    Detta är en avhandling från Umeå : Umeå University

    Författare :Yujiao Song; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric power transmission; Nyquist stability analysis; VSC-HVDC system; Distributed parameter cable model; Small gain theorem.; Weak AC-grid;

    Sammanfattning : Voltage source converter based high voltage direct current (VSC-HVDC) transmission systems have now been in operation since 1997 as it is a reliable and flexible method of power transmission. This thesis focuses on small signal dynamics of such systems, emphasizing stability properties. LÄS MER

  4. 4. Stability of statically and periodically loaded structures

    Detta är en avhandling från Div. of Solid Mechanics, Box 118, S-221 00 Lund

    Författare :Ingrid Svensson; Lunds universitet.; Lund University.; [2000]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydraulics; Mechanical engineering; Produktionsteknik; Production technology; experiments; damping; impacts; branch switching; dynamic stability; deflation; path following; vibrationer; akustik; vakuumteknik; hydraulik; Maskinteknik; vibration and acoustic engineering; vacuum technology;

    Sammanfattning : Popular Abstract in Swedish I denna avhandling analyseras olika typer av stabilitets fenomen. Först studeras det kvasi-statiska uppförandet av en elastisk struktur som lastas med en växande last. LÄS MER

  5. 5. On the robust stability analysis of VSC-HVDC systems

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Yujiao Song; [2016]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; passivity theorem; VSC-HVDC system; Nyquist stability analysis; distributed parameter cable model; symbolic eigenvalue expressions; small gain theorem; AC-grid interaction;

    Sammanfattning : This thesis focuses on small signal stability analysis of VSC-HVDC systems, emphasizing the system stability robustness with regard to the connected AC-grid and the distributed parameter DC-grid model respectively. In addition, for strong AC-grid connected systems, analytical eigenvalue expressions are provided to investigate the impact of physical or control parameters on the system stability for both two-terminal and multi-terminal VSC-HVDC systems. LÄS MER