Sökning: "Running"

Visar resultat 1 - 5 av 789 avhandlingar innehållade ordet Running.

1. 1. Energy Consumption and Running Time for Trains : modelling of running resistance and driver behaviour based on full scale testing

   Författare :Piotr Lukaszewicz; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy consumption; Running time; running resistance; driver behaviour; freight; train; energy coasting method; aerodynamic drag; driver model; degree of coasting; slippage; wind; Energy saving; braking ratio; powering ratio; full scale testing; Vehicle engineering; Farkostteknik;

   Sammanfattning : The accuracy in determined energy consumption and runningtime of trains, by means of computer simulation, is dependent upon the various models used. This thesis aims at developing validated models of running resistance, train and of a generaldriver, all based on full scale testing. LÄS MER

3. 2. On the running-in of gears

   Författare :Sören Sjöberg; Ulf Olofsson; Anders Flodin; KTH; []
   Nyckelord :gears; gear manufacturing; running-in; surface topography; contact area ratio; manganese phosphate; Mechanical engineering; Maskinteknik;

   Sammanfattning : The general trend in gear industry, today, is an increased focus on gear transmission efficiency. Gear transmission efficiency losses arise from loaded and unloaded gear contacts, seals, lubricant and bearings. One way of minimising the losses is to lower the lubricant viscosity. This will reduce the speed dependent losses. LÄS MER

4. 3. Running-related injuries in recreational athletes. : lncidence, risk factors and effectiveness of an injury-prevention programme

   Författare :Pia Desai; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Running-related injuries; Neuromuscular control; Injury prevention;

   Sammanfattning : Running as a form of physical activity continues to grow in popularity and is accompanied by a number of health benefits, but one of the greatest threats that challenge these benefits is running-related injuries. The overall aim of this thesis is to identify the proportion of runners who sustain a running-related injury (incidence), possible reasons as to why they sustain these injuries (risk factors) and, finally, whether general injury-prevention guidelines can be effective in reducing the number of running-related injuries in recreational runners. LÄS MER

5. 4. Running-in of gears - surface and efficiency transformation

   Författare :Mario Sosa; Ulf Olofsson; Stefan Björklund; Ulf Sellgren; Jorge Seabra; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; running-in; surface transformation; efficiency; gears; ground; superfinished; Machine Design; Maskinkonstruktion;

   Sammanfattning : With ever shorter development times and market demands on overall system performance such as efficiency, reliability and low maintenance, accurate predictive tools are necessary and gear drives prove to be no exception. All these characteristics have an impact on a process which has remained a riddle: running-in. LÄS MER

7. 5. Surface Integrity Characterization of Gears with respect to Running-in

   Författare :Dinesh Mallipeddi; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; micropitting; surface asperities; running-in; surface roughness; residual stresses; Gears; surface chemistry;

   Sammanfattning : A gearbox with gears of different sizes is part of a vehicle transmission system that plays an important part in transmitting the engine power to the wheels. The efficient energy transmission highly relies on the performance of gears. Together, the mesh efficiency and durability determines the gear performance. LÄS MER