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Träfflista för sökning "WFRF:(Berg Roger) srt2:(2000-2004)"

Sökning: WFRF:(Berg Roger) > (2000-2004)

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2.
  • Enblom, Roger, et al. (författare)
  • Wheel Wear Modelling Including Disc Braking and Contact Environment : Simulation of 18 Months of Commuter Service in Stockholm
  • 2004
  • Ingår i: Proceedings of the 14th International Wheelset Congress.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • This paper addresses some aspects of modelling and validation of wheel wear simulation. In previous work at KTH the influences of braking and lubrication have been accounted for through empirically estimated average scaling factors. The current research shows how to include those effects in the set of simulations instead. Disc braking has been included in the simulation set and a wear map for moist contact conditions based on recent tribometer tests has been drafted and tested. Good agreement with measurements from theStockholmcommuter service is achieved. It is concluded that the model improvements accounted for are sufficient for adequate simulation of tread wear but that further development of the flange / gauge corner contact modelling is needed.
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3.
  • Tuomas, Roger, et al. (författare)
  • Influence of molecular structure on the lubrication properties of four different esters
  • 2000
  • Ingår i: Tribologia. - 0780-2285. ; 19:4, s. 3-8
  • Tidskriftsartikel (refereegranskat)abstract
    • The lack of published data on the chemical structures of lubricants makes it almost impossible to investigate the influence of structure on lubrication properties. In this investigation, the lubricating properties of three esters with known chemical structure have been investigated and compared with a commercial ester. The lubrication properties that were expected to be dependent on chemical structure such as film thickness and traction, viscosity and friction coefficients were compared by experiment. To measure the film thickness a Ball and Disc Apparatus was used, the traction coefficient was measured in a Jumping Ball Apparatus, the viscosity in a rotational cylindrical viscometer and the friction coefficient in a reciprocating friction and wear test apparatus. The results showed that molecular length has a significant influence on lubrication properties, with longer molecules giving the highest viscosity and greatest film thickness. The length of the molecule did not influence the coefficients of friction, but the traction coefficient, Υ, decreased with increasing molecular length.
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