Sökning: "flat track measurements"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden flat track measurements.

1. 1. The relationship between rolling resistance and tyre operating conditions, with a focus on tyre temperature

   Författare :Lisa Ydrefors; Annika Stensson Trigell; Jenny Jerrelind; Jurek Ejsmon; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rolling resistance; tyre temperature; brush model; parametrisation; rolling resistance measurement; drum measurements; operating conditions; tyre; flat track measurements; Rullmotstånd; rullmotståndsmätning; däcktemperatur; driftsförhållanden; trummätning; borstmodellen; parametrisering; däck; Vehicle and Maritime Engineering; Farkostteknik;

   Sammanfattning : Efforts to reduce greenhouse gas emissions from today’s increasing number of cars and trucks, are crucial in counteracting global warming. These efforts include the intent to reduce the effects of the resistive forces acting on the vehicle. Rolling resistance is one of these forces. LÄS MER

3. 2. Out-of-Round Railway Wheels - Causes and Consequences An Investigation Including Field Tests, Out-of-Roundness Measurements and Numerical Simulations

   Författare :Anders Johansson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polygonalization; wheel flat; full-scale measurements; wear modelling; impact load detector; railway wheel out-of-roundness; wheel removal criterion; dynamic train-track interaction; corrugation;

   Sammanfattning : Causes and consequences of out-of-round railway wheels are investigated through literature studies, full-scale field experiments, out-of-roundness measurements, and numerical simulations. Both defects around the complete wheel circumference (e.g. polygonal wheels with wavelengths up to one wheel circumference) and local defects (e. LÄS MER

4. 3. EMC in railway systems : measurements, modeling and analysis

   Författare :Stefan Niska; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Drift och underhållsteknik; Operation and Maintenance;

   Sammanfattning : The subject of this study and resulting thesis was to investigate the electromagnetic compatibility (EMC) problems in the multi-electrical signaling circuitry along a railway track. These signaling systems have been expanding over time from buried multi-wired electrical copper cables to optical fiber cables, sometimes located parallel to the contact line in the catenaries. LÄS MER

5. 4. Turbulence Structure and Fluxes over Sea

   Författare :Erik Nilsson; Anna Rutgersson; Mark Kelly; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Boundary-layer; Air-sea interaction; turbulent fluxes; Meteorology; Meteorologi;

   Sammanfattning : Understanding the processes that control air-sea exchange of momentum, sensible heat and moisture (latent heat) is of great importance for atmospheric and oceanic modelling. In the atmosphere, for instance, cyclone intensity and track depends on these processes. LÄS MER

7. 5. Use of thermosyphons in a subarctic climate

   Författare :Anna Forsström; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Soil Mechanics; Geoteknik;

   Sammanfattning : In frozen ground, climatic changes and thermal disturbance might cause thawing and degradation of ground previously frozen. Foundations built on frozen ground might be destroyed in a matter of a few seasons. These problems are mostly pronounced in permafrost regions, but also exist in regions with more moderate climates. LÄS MER