Sökning: "axial stiffness"

Visar resultat 1 - 5 av 43 avhandlingar innehållade orden axial stiffness.

  1. 1. Subclinical cardiovascular disease and health related quality of life in patients with radiographic axial spondyloarthritis

    Författare :Lucy Law; Stefan Söderberg; Helena Forsblad-d'Elia; Per Lindqvist; Isabel Goncalves; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Radiographic axial spondyloarthritis; health related quality of life; cardiovascular disease; ultrasound; common carotid artery; intima media thickness; epicardial adipose tissue; Medicine; medicin; cardiovascular disease; hjärt- och kärlforskning; reumatologi; rheumatology;

    Sammanfattning : Background: Radiographic axial spondyloarthritis (r-axSpA) is a chronic inflammatory rheumatic disease predominantly affecting the axial skeleton. The global prevalence of r-axSpA is between 0.1-1.4%. LÄS MER

  3. 2. Stiffness modification of tensegrity structures

    Författare :Seif Dalilsafaei; Anders Eriksson; Karl-Gunnar Olsson; KTH; []
    Nyckelord :tensegrity; boom; finite element analysis; genetic algorithm; flexibility analysis; active structure; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Although the concept of tensegrity structures was invented in the beginning of the twentieth century, the applications of these structures are limited, partially due to their low stiffness. The stiffness of tensegrities comes from topology, configuration, pre-stress and initial axial element stiffnesses. LÄS MER

  4. 3. Stiffness and vibration properties of slender tensegrity structures

    Författare :Seif Dalil Safaei; Gunnar Tibert; René Motro; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tensegrity booms; Tensegrity grids; Tensegrity power lines; Finite element analysis; Genetic algorithm; Flexibility analysis; Form-finding; Pre-stress design; Optimization;

    Sammanfattning : The stiffness and frequency properties of tensegrity structures are functions of the pre-stress, topology, configuration, and axial stiffness of the elements. The tensegrity structures considered are tensegrity booms, tensegrity grids, and tensegrity power lines.A study has been carried out on the pre-stress design. LÄS MER

  5. 4. Engineering rubber bushing stiffness formulas including dynamic amplitude dependence

    Författare :Maria-José Garcia; Leif Kari; Anders Ågren; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Construction engineering; Konstruktionsteknik;

    Sammanfattning : Engineering design models for the torsion and axial dynamic stiffness of carbon black filled rubber bushings in the frequency domain including amplitude dependence are presented. They are founded on a developed material model which is the result of applying a separable elastic, viscoelastic and friction rubber component model to the material level. LÄS MER

  7. 5. Micro-cracking and delaminations of composite laminates under tensile quasi-static and cyclic loading

    Författare :Hiba Ben Kahla; Janis Varna; Zoubir Ayadi; Federica Daghla; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Laminate; Fatigue; damage growth; stiffness reduction; NCF; Polymeric Composite Materials; Polymera kompositmaterial;

    Sammanfattning : Aerospace industry is devoted to improving the aircraft performance while reducing its weight and limiting the emissions. Part of this objective can be accomplished with the use of high-performance long fibre reinforced polymer laminated composites. LÄS MER