Search for dissertations about: "constant load"

Showing result 21 - 25 of 185 swedish dissertations containing the words constant load.

  2. 21. Moisture Induced Stress Perpendicular to Grain in Timber Structures

    Author : Martin Häglund; Avdelningen för Konstruktionsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wood.; timber; perpendicular to grain; load combination factor; tensile stress; mechano-sorption; Moisture induced eigen-stress; varying moisture content;

    Abstract : Timber structures and wooden element are in general affected by moisture and moisture variation in different ways. Their hygroscopic properties result in adsorption of water when wetted and in desorption when dried. READ MORE

  4. 22. Wheels, Rails and Insulated Joints - Damage and Failure Probability at High Speed and Axle Load

    Author : Johan Sandström; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rail breaks; probability; railway mechanics; contact mechanics; insulated joints; defects; fatigue;

    Abstract : The thesis deals with some fatigue related problems in railway mechanics related to increased axle loads and speeds. The focus is on defects and discontinuities in the wheel--rail system that affect the risk of fatigue and fracture of railway components such as wheels, rails and insulated joints. READ MORE

  5. 23. Mechanical and Hydromechanical Behaviour of Hard Rock Joints. A laboratory study

    Author : Roger Olsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; laboratory shear tests; constant normal stiffness; rock mechanics; hydromechanical behaivour; rock joints; replicas;

    Abstract : As a consequence of rock engineering works, the rock mass will deform due to stress changes. Most deformation occurs in the rock joints, in form of normal and shear strains. These deformations will also change the void geometry and thereby the joint aperture and fluid flow. READ MORE

  6. 24. Antiretroviral treatment of HIV-1 in Sweden with focus on virological aspects

    Author : Erik Sörstedt; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; HIV-1; antiretroviral therapy; transient viremia; viral blip; nucleoside transcriptase inhibitor resistance; dolutegravir; baseline viral load; HIV RNA; virological failure;

    Abstract : From a clinical standpoint, there are many factors to consider when optimizing the care for people living with HIV (PLWH). With help from clinical guidelines, most obstacles can be addressed. Expanded knowledge is however in constant demand, from local conditions to universal processes. READ MORE

  7. 25. Analysis and Design of Software-Based Optimal PID Controllers

    Author : Olof Garpinger; Institutionen för reglerteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; process industry; PID control; software; optimization; load disturbance attenuation; robustness; noise sensitivity; trade-off plots; modeling; friction stir welding;

    Abstract : A large process industry can have somewhere between five hundred and five thousand control loops, and PID controllers are used in 90–97% of the cases. It is well-known that only 20–30% of the controllers in the process industry are tuned satisfactorily, but with the methods available today it is considered too time-consuming to optimize each single controller. READ MORE