Sökning: "Flutter"

Visar resultat 21 - 25 av 40 avhandlingar innehållade ordet Flutter.

  1. 21. Control and optimization of structures with fluid interaction

    Författare :Dan Borglund; KTH; []
    Nyckelord :;

    Sammanfattning : Various problems on the optimal design of elastic structures subject to nonconservative fluid-dynamic forces are considered. The optimal design problem istypically posed as minimizing structural weight subject to constraints on structural stability. LÄS MER

  3. 22. Development and Validation of a Numerical Tool for the Aeromechanical Design of Turbomachinery

    Författare :María Angélica Mayorca; Torsten Fransson; Damian Vogt; Eric Seinturier; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aeromechanical design; turbomachinery; numerical tool; reduced order modeling; mistuning; ROM; aero-structure coupling; CFD; FEM; methods; Mechanical energy engineering; Mekanisk energiteknik;

    Sammanfattning : In aeromechanical design one of the major rules is to operate under High Cyclic Fatigue (HCF) margins and away from flutter. The level of dynamic excitations and risk of HCF can be estimated by performing forced response analyses from blade row interaction forces or Low Engine Order (LEO) excitation mechanisms. LÄS MER

  4. 23. Cryoablation of cardiac arrhythmias

    Författare :Hamid Bastani; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : This thesis evaluates the safety and efficacy of cryoablation in supraventricular tachyarrhythmias. In Study I, the acute and long-term outcome of cryoablation therapy of typical atrioventricular nodal reentrant tachycardia (AVNRT) was studied in a large series of patients (n=312). LÄS MER

  5. 24. On Aerodynamic and Aeroelastic Modeling for Aircraft Design

    Författare :Mikaela Lokatt; Ulf Ringertz; David Eller; Holger Mai; KTH; []
    Nyckelord :viscous-inviscid interaction model; laminar flow wing; aerodynamics; aeroelasticity; aircraft design; Flyg- och rymdteknik; Aerospace Engineering;

    Sammanfattning : The work presented in this thesis was performed with the aim of developing improved prediction methods for aerodynamic and aeroelastic analysis to be used in aircraft design. The first part of the thesis concerns the development of a viscous-inviscid interaction model for steady aerodynamic predictions. LÄS MER

  7. 25. Long-term effects of adjuvant tamoxifen treatment on cardiovascular disease and cancer

    Författare :Johan Rosell; John Carstensen; Olle Stål; Bo Nordenskjöld; Lars Holmberg; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Adjuvant; adverse events; breast cancer; cerebrovascular disease; coronary heart disease; heart failure; lung cancer; second primary cancer; tamoxifen;

    Sammanfattning : The aims of this thesis were to investigate the long-term effects of adjuvant tamoxifen treatment on breast cancer recurrence and mortality, cardiovascular disease, and the incidence of secondary cancer.Between 1982 and 1992, postmenopausal patients with early stage breast cancer were included in a randomized clinical study of 2 or 5 years of postoperative tamoxifen therapy. LÄS MER