Search for dissertations about: "boundary-lubrication"

Showing result 1 - 5 of 34 swedish dissertations containing the word boundary-lubrication.

  1. 1. Rough surfaces in contact : artificial intelligence and boundary lubrication

    Author : Marco Rapetto; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machine Elements; Maskinelement;

    Abstract : Interacting surfaces are found in mechanical systems and components. Since engineered surfaces are not perfectly smooth, only a fraction of the nominal surface area is actually in contact. This fraction is denoted as the real area of contact, Ar, and is formed by the sum of the contact spots between the two touching surfaces. READ MORE

  2. 2. Boundary lubrication in screw-nut transmissions

    Author : Lars O. Ekerfors; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinelement; Machine Elements;

    Abstract : This report deals with the function of screw-nut transmissions (powerscrews). Two aspects of this function have been investigated. Owing to different running parameters, primarily sliding speed and average pressure between the sliding surfaces of the thread, the coefficient of friction and the efficiency will vary within wide limits. READ MORE

  3. 3. EAL's boundary lubrication performance in hydro power plants

    Author : Jan Ukonsaari; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinelement; Machine Elements;

    Abstract : This licentiate thesis concerns the possibility to change mineral based hydraulic fluid to environmentally adapted lubricants (EAL's) in water turbine applications from the point of view of boundary lubrication. A new test rig was designed to meet the conditions for a slow and/or intermittent motion journal bearing. READ MORE

  4. 4. The Friction between Paper Surfaces

    Author : Niklas Garoff; KTH; []
    Keywords : friction; fibers; boundary lubrication; adhesion; capillary condensation; surface forces; chemcial analysis; x-ray photoelectron spectroscopy; atomic force microscope;

    Abstract : The main objective for the work described in this PhD thesiswas to formulate a friction model to characterize thefrictional behavior of paper. More specifically, the modelshould explain a phenomenon that is typical for paper grades,viz.: that the level of paper-to-paper friction is dependent onthe direction and the number of previous slides. READ MORE

  5. 5. Polymers in Aqueous Lubrication

    Author : Junxue An; Per M. Claesson; Martin Malsten; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lubrication; boundary lubrication; friction; surface forces; adsorption; adsorption hysteresis; non-equilibrium state; diblock copolymer; polyelectrolyte; thermoresponsive; mucin; QCM-D; ellipsometry; AFM; Kemi; Chemistry;

    Abstract : The main objective of this thesis work was to gain understanding of the layer properties and polymer structures that were able to aid lubrication in aqueous media. To this end, three types of polyelectrolytes: a diblock copolymer, a train-of-brushes and two brush-with-anchor mucins have been utilized. READ MORE