Search for dissertations about: "Cylindrical Geometry"

Showing result 1 - 5 of 42 swedish dissertations containing the words Cylindrical Geometry.

2. 1. Prestress and its application to shell, fabric, and cable net structures

   Author : Alexander Sehlström; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HUMANIORA; HUMANITIES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Geometric stiffness; Form finding; Conceptual design; Stress pattern; Engineering; Prestress; Architecture; Structuraldesign;

   Abstract : Prestressing and shells provide means to create material-efficient and well-functioning structures, as do their combination, offering opportunities for increased material efficiency within the built environment. Prestressing introduces stresses in an object to enhance its performance, and shells include concrete shells, masonry vaults, fabric structures, cable nets, and timber or steel gridshells. READ MORE

4. 2. Buoy Geometry, Size and Hydrodynamics for Power Take Off Device for Point Absorber Linear Wave Energy Converter

   Author : Halvar Gravråkmo; Mats Leijon; Jan Isberg; Luke Myers; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; point absorber; wave; energy; converter; ocean; wec; toroidal; buoy; torus; cylindrical; cylinder; experiment; full scale; trial; sea; energy; renewable; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

   Abstract : Wave energy converters of point absorber type have been developed and constructed. Full scale experiments have been carried out at sea and electricity has been successfully delivered. Linear permanent magnet generators together with a subsea substation and buoys of various geometric shapes have been investigated theoretically and experimentally. READ MORE

5. 3. Modelling of ultrasonic scattering from a crack in a pipe

   Author : Jacob Rubenson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Non-Destructive Testing; Cylindrical Geometry; Pipe; Crack; Wave propagation;

   Abstract : This thesis considers elastic wave scattering in an infinitely long cylindrical pipe with an infinitely long internal axial crack. The method used in this thesis is called a hypersingular integral equation method since it starts with an integral representation and by using the Green's tensor of the pipe it can be manipulated to a hypersingular equation for the crack-opening displacement (COD). READ MORE

6. 4. Residual stress in a T-butt joint weld : cylinder versus plane plate geometry

   Author : Berth Eriksson; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

   Abstract : The welding process introduces residual stress originating from the heating, melting and cooling of the material. From the point of view of fatigue and stress corrosion cracking, the weld residual stress perpendicular to the weld axis is of particular interest. READ MORE

7. 5. Scattering of Elastic Waves by Inhomogeneities in Cylindrical Structures

   Author : Sune Olsson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : In the present thesis we extend the null field approach (in the literature also often referred to as "the T matrix method" or "the extended boundary condition method") to some new multiple scattering problems involving infinite cylindrical surfaces and a bounded obstacle. The first case considered is the scattering of acoustic waves by a bounded obstacle outside an infinite cylinder of constant cross section. READ MORE