Sökning: "topology optimization"

Visar resultat 6 - 10 av 105 avhandlingar innehållade orden topology optimization.

  1. 6. Topology optimization of antennas and waveguide transitions

    Författare :Emadeldeen Hassan; Martin Berggren; Daniel Noreland; Eddie Wadbro; Mats Gustafsson; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Maxwell s equations; topology optimization; antennas; waveguide transition; finite-difference time-domain; gradient-based optimization; adjoint-field problem; microwave devices.; business data processing; administrativ databehandling;

    Sammanfattning : This thesis introduces a topology optimization approach to design, from scratch, efficient microwave devices, such as antennas and waveguide transitions. The design of these devices is formulated as a general optimization problem that aims to build the whole layout of the device in order to extremize a chosen objective function. LÄS MER

  3. 7. Topology Optimization of Fatigue-Constrained Structures

    Författare :Henrik Svärd; Krister Svanberg; Pierre Duysinx; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; topology optimization; fatigue constraints; stress constraints; density filters; restriction methods; weakest link theory; critical plane criteria; Mathematics; Matematik;

    Sammanfattning : Fatigue, or failure of material due to repeated cyclic loading, is one of the most common causes of mechanical failures. The risk of fatigue in a load carrying component is often lowered by adding material, thereby reducing stresses. LÄS MER

  4. 8. Topology optimization of non-linear, dissipative structures and materials

    Författare :Niklas Ivarsson; Hållfasthetslära; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Topology optimization; Stiffness optimization; Finite strain; Rate-dependent plasticity; Discrete adjoint sensitivity analysis;

    Sammanfattning : Topology optimization is a mathematical tool for finding optimal distributions of material phases within a design domain. It is commonly used in early design stages to generate conceptual structural layouts. Ultimately, designs generated by topology optimization consist of distinct material phases with enhanced performance. LÄS MER

  5. 9. On Models and Methods for Global Optimization of Structural Topology

    Författare :Mathias Stolpe; KTH; []
    Nyckelord :topology optimization; global optimization; stress constraints; linear programming; mixed integer programming; branch-and-bound;

    Sammanfattning : This thesis consists of an introduction and sevenindependent, but closely related, papers which all deal withproblems in structural optimization. In particular, we considermodels and methods for global optimization of problems intopology design of discrete and continuum structures. LÄS MER

  7. 10. On Methods for Discrete Topology Optimization of Continuum Structures

    Författare :Mats Werme; Krister Svanberg; Wolfgang Achtziger; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Topology optimization; Stress constraints; Sensitivity calculations; Neighbourhood search methods; Sequential integer programming; Optimization; systems theory; Optimeringslära; systemteori;

    Sammanfattning : This thesis consists of an introduction and seven appended papers. The purpose of the introduction is to give an overview of the field of topology optimization of discretized load carrying continuum structures. LÄS MER