Sökning: "wheelset"

Visar resultat 6 - 10 av 23 avhandlingar innehållade ordet wheelset.

1. 6. Wheelset Structural Flexibility and Track Flexibility in Vehicle-Track Dynamic Interaction

   Författare :Nizar Chaar; Stefano Bruni; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Vehicle-track dynamic interaction; wheelset structural flexibility; Structural and vibration physics; Struktur- och vibrationsfysik;

   Sammanfattning : This thesis investigates the influence of wheelset structural flexibility and track flexibility on the vehicle-track dynamic interaction, mainly in terms of wheel-rail forces up to 200 Hz, using simulations and measurements. The previous knowledge in this field is first reviewed and summarized, then two case studies are selected for investigation. LÄS MER

3. 7. Rail Corrugation Growth on Curves

   Författare :Peter Torstensson; Chalmers tekniska högskola; []
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

4. 8. Rail Corrugation Growth on Curves

   Författare :Peter Torstensson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; simulation; track and wheelset structural flexibility; small radius curves; short-pitch rail corrugation; dynamic vehicle–track interaction; test rig and field measurements; wear;

   Sammanfattning : Short-pitch rail corrugation that may develop on the low (inner) rail on small radius curves causes increased noise and vibration levels on railway networks worldwide. In lack of a generally applicable treatment, track authorities are forced to run expensive rail grinding programs on a regular basis to manage these problems. LÄS MER

5. 9. On the Influence of Rail Vehicle Parameters on the Derailment Process and its Consequences

   Författare :Dan Brabie; Evert Andersson; Johan Oscarsson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; train; railway; rail vehicle; accident; incident; derailment; bogie design; simulation; wheel; sleeper; impact; Vehicle engineering; Farkostteknik;

   Sammanfattning : This thesis aims at systematically studying the possibilities of minimising devastatingconsequences of high-speed derailments by appropriate measures and features in thetrain design, including the running gear. The course of events immediately afterderailments is studied with respect to whether the train stays upright and close to thetrack centre line or deviates laterally with probably serious consequences. LÄS MER

7. 10. Railway Wheelsets: Theory, Experiments and Design Considering Temperatures, Stresses and Deformations as Induced by Braking Loads and Contact Forces

   Författare :Mikael Fermér; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Railway wheelset components exposed to braking loads and contact forces have been studied. The work has been performed in close cooperation with the Swedish wheelset manufacturer ABB SURA Traction AB, and it has resulted in one brake disc prototype and two different wheel prototypes. LÄS MER