Search for dissertations about: "modeshape"

Found 4 swedish dissertations containing the word modeshape.

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

    Author : Moosa Muhammad; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flutter; turbomachinery; compressor blade; CFD; stability; aerodynamic damping; stability parameter; modeshape; Mechanical energy engineering; Mekanisk energiteknik;

    Abstract : .... READ MORE

  4. 2. Concepts for Power System Small Signal Stability Analysis and Feedback Control Design Considering Synchrophasor Measurements

    Author : Yuwa Chompoobutrgool; Luigi Vanfretti; Mats Larsson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wide-area damping control; inter-area oscillations; power system stabilizers; PMU; Järnvägsgruppen - Elsystem; Järnvägsgruppen - Elsystem;

    Abstract : In the Nordic power network, the existence of poorly damped low-frequency inter-area oscillations (LFIOs) has long affected stability constraints, and thereby, limited power transfer capacity. Adequate damping of inter-area modes is, thus, necessary to secure system operation and ensure system reliability while increasing power transfers. READ MORE

  5. 3. Experimental study of fluid-structure interactions oon a generic model

    Author : Davy Allegret-Bourdon; KTH; []
    Keywords : ;

    Abstract : A new type of test facility is presented which allows theinvestigation of fluid-structure interactions using a genericflexible model. Rather than modelling the complex geometry of aturbomachine blade passage or blade row, this test facilityuses a two dimensional generic bump located in a straightchannel in order to reach a better understanding of the bendingflutter phenomenon. READ MORE

  6. 4. Flutter in sectored turbine vanes

    Author : Olga V. Chernysheva; KTH; []
    Keywords : turbomachinery; aerodynamics; unsteady CFD; design; flutter;

    Abstract : In order to eliminate or reduce vibration problems inturbomachines without a high increase in the complexity of thevibratory behavior, the adjacent airfoils around the wheel areoften mechanically connected together with lacing wires, tip orpart-span shrouds in a number of identical sectors. Although anaerodynamic stabilizing effect of tying airfoils together ingroups on the whole cascade is indicated by numerical andexperimental studies, for some operating conditions suchsectored vane cascade can still remain unstable. READ MORE