Search for dissertations about: "finite"

Showing result 6 - 10 of 2560 swedish dissertations containing the word finite.

  2. 6. Finite Element Modelling of Fluid-Structure Interaction

    Author : Göran Sandberg; Byggnadsmekanik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite Element Method; Coupled problem; fluid-structure interaction; Transient; Acoustics; Caviation; Time Stepping; Symmetric; Nonlinear acoustics; Submerged structures; finite element method; Coupled problem; Fluid-structure interaction; Transient; Acoustics; Cavitation; Time Stepping; Symmetric; Nonlinear acoustics; Submerged structures;

    Abstract : The dynamic interaction between non-viscid, compressible fluid and an elastic structure is studied. Finte element formulations, using the weighted residual method, are derived. Different primary variables in the fluid domain are used and different source functions are considered. READ MORE

  4. 7. Reduction Techniques for Finite (Tree) Automata

    Author : Lisa Kaati; Parosh Aziz Abdulla; Frank Drewes; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Finite automata; tree automata; bisimulation; minimization; simulation; composed bisimulation; composed simulation; Datavetenskap; Computer Science;

    Abstract : Finite automata appear in almost every branch of computer science, for example in model checking, in natural language processing and in database theory. In many applications where finite automata occur, it is highly desirable to deal with automata that are as small as possible, in order to save memory as well as excecution time. READ MORE

  5. 8. Computing abelian varieties over finite fields

    Author : Stefano Marseglia; Jonas Bergström; Christophe Ritzenthaler; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; abelian varieties; finite fields; period matrices; ideal classes; orders; number fields; integral matrices; Mathematics; matematik;

    Abstract : In this thesis we address the problem of developing effective algorithms to compute isomorphism classes of polarized abelian varieties over a finite field and of fractional ideals of an order in a finite product of number fields.There are well-known methods to efficiently compute the classes of invertible ideals of an order in a number field, but not much has previously been known about non-invertible ideals. READ MORE

  6. 9. Stable High-Order Finite Difference Methods for Aerodynamics

    Author : Magnus Svärd; Jan Nordström; Thomas Hagstrom; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; finite difference methods; high-order accuracy; summation-by-parts; stability; energy estimates; finite volume methods; Numerical analysis; Numerisk analys; Scientific Computing; Beräkningsvetenskap; Numerical Analysis;

    Abstract : In this thesis, the numerical solution of time-dependent partial differential equations (PDE) is studied. In particular high-order finite difference methods on Summation-by-parts (SBP) form are analysed and applied to model problems as well as the PDEs governing aerodynamics. READ MORE

  7. 10. Simulation of contact, friction and wear in gears : a finite element approach

    Author : Olle Lundvall; Linköpings universitet; []
    Keywords : Gears; Gear noise; Contact mechanics; Simulation; Friction; Wear; Transmission error;

    Abstract : In this thesis, resent methods in computational contact mechanics is brought into the process of gear design. The finite element method is used to model two elastic bodies in contact. By defining a contact interface between these two bodies, constitutive laws, regarding normal contact, friction and wear, are included. READ MORE