Sökning: "eigen"

Visar resultat 1 - 5 av 10 avhandlingar innehållade ordet eigen.

  1. 1. Development of Accurate Reduced Order Models in a Simulation Tool for Turbomachinery Aeromechanical Phenomena

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Mauricio Gutierrez Salas; KTH.; [2018]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flutter; forced response; high cycle fatigue; reduced order models; ROM; craig-bampton; mistuning; tuned; mistuned; cyclic; noncyclic; craig-chang; free-interface. fixed-interface; subset nominal mode; SNM; CBMS; CCMS; CCC; CBC; FEM; CMS; modal; eigen; modeshapes; aeroelasticity; aeromechanical; tool; turbomachinery; turbine; compressor; AROMA; Energiteknik; Energy Technology;

    Sammanfattning : Modern gas turbines are still vulnerable to vibrations when operated at certain speeds. This unstable environment can lead to high cycle fatigue (HCF) and damage several of the components inside the turbine. LÄS MER

  2. 2. Generalized Hebbian Algorithm for Dimensionality Reduction in Natural Language Processing

    Detta är en avhandling från Institutionen för datavetenskap

    Författare :Genevieve Gorrell; Arne Jönsson; Robin Cooper; Alexander Rudnicky; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Generalized Hebbian Algorithm; Language Modelling; Singular Value Decomposition; Eigen Decomposition; Latent Semantic Analysis; Vector Space Models; HUMANITIES and RELIGION Languages and linguistics Linguistic subjects Computational linguistics; HUMANIORA och RELIGIONSVETENSKAP Språkvetenskap Lingvistikämnen Datorlingvistik;

    Sammanfattning : The current surge of interest in search and comparison tasks in natural language processing has brought with it a focus on vector space approaches and vector space dimensionality reduction techniques. Presenting data as points in hyperspace provides opportunities to use a variety of welldeveloped tools pertinent to this representation. LÄS MER

  3. 3. Moisture Induced Stress Perpendicular to Grain in Timber Structures

    Detta är en avhandling från Div. of Structural Engineering, Lund University

    Författare :Martin Häglund; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wood.; timber; perpendicular to grain; load combination factor; tensile stress; mechano-sorption; Moisture induced eigen-stress; varying moisture content;

    Sammanfattning : Timber structures and wooden element are in general affected by moisture and moisture variation in different ways. Their hygroscopic properties result in adsorption of water when wetted and in desorption when dried. LÄS MER

  4. 4. Hardy-Lieb-Thirring inequalities for eigenvalues of Schrödinger operators

    Detta är en avhandling från Stockholm : KTH

    Författare :Rupert L. Frank; KTH.; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MATHEMATICS; MATEMATIK;

    Sammanfattning : This thesis is devoted to quantitative questions about the discrete spectrum of Schrödinger-type operators.In Paper I we show that the Lieb-Thirring inequalities on moments of negative eigen¬values remain true, with possibly different constants, when the critical Hardy weight is subtracted from the Laplace operator. LÄS MER

  5. 5. Experimental Determination of Aeracoustic Sources in Low Mach Number Internal Flows

    Detta är en avhandling från Stockholm : KTH

    Författare :Andreas Holmberg; KTH.; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aeracoustics; ducts; N-ports; scattering matrix; wave decomposition; source determination; over-determination; flow noise; fluid-acoustic interaction; fluid-structure-acoustic interaction; wave number; T-junction; power balance; grazing-bias flow; TECHNOLOGY Engineering physics Acoustics; TEKNIKVETENSKAP Teknisk fysik Akustik; TECHNOLOGY Engineering mechanics Vehicle engineering; TEKNIKVETENSKAP Teknisk mekanik Farkostteknik;

    Sammanfattning : In this thesis, the in-duct experimental methods for determining aeroacoustic N-ports of in-duct elements are discussed and improved. The scattering matrix determination methods and the related wave decomposition methods are evaluated from measurements in an empty duct carrying a mean flow. LÄS MER