Search for dissertations about: "non-Hertzian contact"

Found 5 swedish dissertations containing the words non-Hertzian contact.

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

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Ivan Zenzerovic; [2017]
    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

  2. 2. Engineering model for curve squeal formulated in the time domain

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Ivan Zenzerovic; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tangential point-contact model; time domain; frictional instability; Curve squeal; rolling contact; non- Hertzian contact;

    Abstract : Curve squeal is a type of railway noise that may arise when a railway vehicle negotiates a relatively tight curve. Squeal is common in curves of a radius lower than 200 meters. A single frequency dominates the radiated sound, which makes squeal a very tonal noise. READ MORE

  3. 3. Time-domain modelling of high-frequency wheel/rail interaction

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Astrid Pieringer; [2011]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; discrete irregularities; frictional instability; non-Hertzian contact; railway noise; time domain; transient contact; wheel rail interaction; roughness;

    Abstract : The interaction between wheel and rail is the predominant source of noise emission from railway operations in a wide range of conventional speeds. On the one hand, this wheel/rail noise concerns rolling noise and impact noise caused by the vertical interaction excited by roughness and discrete irregularities of the wheel/rail running surfaces, respectively. READ MORE

  4. 4. Modelling of wheel/rail interaction considering roughness and discrete irregularities

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Astrid Pieringer; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vertical wheel rail interaction; railway noise; roughness; non-Hertzian contact; time domain; discrete irregularities;

    Abstract : The interaction between wheel and rail is the predominant source of noise emission from railway operations in a wide range of conventional speeds. On the one hand, this wheel/rail noise concerns rolling noise and impact noise caused by the vertical interaction excited by roughness and discrete irregularities of the wheel/rail running surfaces, respectively. READ MORE

  5. 5. Rail Corrugation Growth on Curves

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Peter Torstensson; [2012]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; short-pitch rail corrugation; rotating flexible wheelset model; small radius curves; prediction of long-term roughness growth; plastic deformation; non-Hertzian and non-steady wheel‒rail contact; wear; rutting corrugation;

    Abstract : The development of periodic irregularities with distinct wavelengths (corrugation) on the low rail of small radius curves is studied through mathematical modelling, numerical simulations, field measurements and laboratory investigations. One year of monitoring of roughness on the low rail of a 120 m radius curve on the metro of Stockholm Public Transport (SL) showed severe growth of rail corrugation with wavelengths of about 5 cm and 8 cm. READ MORE