Search for dissertations about: "modal synthesis"

Showing result 1 - 5 of 15 swedish dissertations containing the words modal synthesis.

  1. 1. Component Synthesis of Machine Tool and Cutter for Process Optimisation

    Author : Anders Liljerehn; Chalmers University of Technology; []
    Keywords : State-space models; Component synthesis; Experimental modal analysis; System Identification; Receptance coupling; Metal Cutting; Chatter stability;

    Abstract : Metal cutting is today one of the leading forming processes in the manufacturing industry. The metal cutting industry houses several actors providing machine tools and cutting tools with a fierce competition as a consequence. Extensive efforts are made to improve the performance of both machine tools and cutting tools. READ MORE

  2. 2. Modal analysis and synthesis in transient vibration and structural optimization problems

    Author : Thomas Abrahamsson; Chalmers University of Technology; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Complex modal analysis; transient analysis; nonproportional damping; adjoint eigenproblems; follower forces; structural optimization; nonconservative systems; sensitivity analysis; linear continous structural systems; moving loads;

    Abstract : .... READ MORE

  3. 3. Modelling Stiffness and Damping by Use of Fractional Calculus with Application to Railpads

    Author : Åsa Fenander; Chalmers University of Technology; []
    Keywords : stiffness; initial conditions; modal synthesis; time integration; measurements; fractional calculus; railway tracks; fractional integrals; damping; railpads; structural dynamics; fractional derivatives; mathematical models;

    Abstract : When studying the dynamic behaviour of a structure, e g a railway track, it is important for the analyst to model both stiffness and damping accurately. Mathematical models including fractional derivatives have been found to work well for many materials. Such models are linear and causal. READ MORE

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

    Author : Mauricio Gutierrez Salas; Björn Laumert; Paul Petrie-Repar; Damian Vogt; Carlos Martel; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; 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;

    Abstract : 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. READ MORE

  5. 5. Fluid-conveying beams in transverse vibration

    Author : Jan Henrik Sällström; Chalmers University of Technology; []
    Keywords : plug flow; ambient medium; support accelerations; rigid bodies; complex modal synthesis; exact and polynominal finite elements; taut strings; Rayleigh-Timoshenko theory; transverse linear beam vibration; prescribed loads; sensitivity analysis; stability optimization; divergence and flutter instability; Euler-Bernoulli theory; axially moving materials; stationary and transient vibration;

    Abstract : .... READ MORE