Search for dissertations about: "point contact"

Showing result 1 - 5 of 297 swedish dissertations containing the words point contact.

  2. 1. Time-domain modelling of curve squeal: a fast model for one- and two-point wheel/rail contact

    Author : Ivan Zenzerovic; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; two-point contact; non-Hertzian contact; dynamics coupling; rolling contact; tangential point-contact model; Curve squeal; time domain; frictional instability;

    Abstract : Curve squeal is a type of railway noise that may arise when a railway vehicle negotiates a relatively tight curve. A single frequency, corresponding to a wheel mode, dominates the radiated sound, which makes squeal a very tonal noise. READ MORE

  4. 2. Vibrations induced by surface roughness in nonlinear rolling contacts

    Author : Oskar Erik Lundberg; Ines Lopez Arteaga; Svante Finnveden; Will Graham; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rolling contact; nonlinear contact; contact stiffness; contact filter; state-dependent method; relative displacement; wheel-rail contact; Vehicle and Maritime Engineering; Farkostteknik;

    Abstract : For efficient transportation in either trains, busses or passenger cars, rolling elements such as wheels, tyres, bearings and transmission elements are fundamental. The energy efficiency and the generation of noise and vibrations in rolling contacts depend on the surface roughness of contacting bodies. READ MORE

  5. 3. On the asperity point load mechanism for rolling contact fatigue

    Author : Johan Dahlberg; Bo Alfredsson; Sören Sjöström; KTH; []
    Keywords : Rolling contact fatigue; Spalling; Asperity contact; Point load; Micro-cracks; Traction; Applied slip; TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : Rolling contact fatigue is a damage process that may arise in mechanical applications with repeated rolling contacts. Some examples are: gears; cams; bearings; rail/wheel contacts. The resulting damage is often visible with the naked eye as millimeter sized surface craters. READ MORE

  6. 4. Progressives in use and contact : A descriptive, areal and typological study with special focus on selected Iranian languages

    Author : Ghazaleh Vafaeian; Östen Dahl; Agnes Korn; Maria Koptjevskaja Tamm; Pier Marco Bertinetto; Stockholms universitet; []
    Keywords : HUMANIORA; HUMANITIES; progressive; use; contact; areal; parallel corpora; typology; grammaticalization; Iranian; Persian; Mazandarani; Gilaki; Taleshi; Tati; Linguistics; lingvistik;

    Abstract : Progressives are grammatical patterns primarily used to refer to events that are ongoing at a specific time. This thesis investigates uses of such patterns in a number of languages as well as the interaction of a number of progressives in contact. READ MORE

  7. 5. Noise in quantum point contacts

    Author : Jan Peter Hessling; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; noise; 1 f-noise; elementary fluctuator; quantum point contact; flicker; two level system; impurity; öow frequency;

    Abstract : .... READ MORE