Sökning: "High-speed photography"

Visar resultat 6 - 10 av 21 avhandlingar innehållade orden High-speed photography.

  1. 6. Displacement field measurement using digital speckle photography for characterisation of materials subjected to large deformations and high strain rates

    Författare :Jörgen Kajberg; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : In many technical processes, material is deformed under conditions involving large deformations (strains) and/or high strain rates. Examples of such processes are collisions, impact, penetration, metal forming, powder compaction and crack propagation. LÄS MER

  3. 7. Propagation of weak shock waves in an elliptical cavity

    Författare :Göran Gustafsson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : The propagation of weak shock waves in a planar elliptical cavity is studied theoretically and experimentally. The results are of interest in the design of an elliptical high-speed water jet generator operating in a transient fashion with electrically generated shocks in the acoustic regime. LÄS MER

  4. 8. Towards Discrete Element Modelling of Rock Drilling

    Författare :Albin Wessling; Simon Larsson; Pär Jonsén; Jörgen Kajberg; Bengt Wikman; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DEM Rock Dynamic Drilling; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : The method of percussive rotary drilling is recognized as the most efficient method for hard rock drilling. Despite the clear advantages over conventional rotary meth-ods, there are still uncertainties associated with percussive rotary drilling. LÄS MER

  5. 9. Towards energy-based fracture modelling for crashworthiness applications

    Författare :Simon Jonsson; Jörgen Kajberg; Stefan Golling; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : The automotive industry is currently adapting to progessively more stringent emission and safety regulations imposed by governmental agencies. This introduces significant design difficulties due to the conflicting nature of passenger safety in automotive manufacturing, namely that increased crashworthiness generally leads to heavier vehicles, which in turn leads to more severe crashes. LÄS MER

  7. 10. Interaction of sound waves with a swirl stabilized wood powder flame and their effects on flame characteristics

    Författare :Burak Göktepe; Henrik Wiinnika; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy Engineering; Energiteknik;

    Sammanfattning : Swirling flows have been widely used for many years in engineering applications such as; chemical and mechanical mixing devices, separation units, spray drying technologies, turbo machinery and combustion systems. In practical combustion applications, swirl motion has been adopted to the incoming reactant flows in order to enhance the mixing of fuel and oxidizer and to improve flame stabilization and establishment, especially in regions of relatively low velocities, by recirculating hot product gas to the incoming reactants. LÄS MER