DELIVERABLE 2.8 - urban track
DELIVERABLE 2.8 - urban track
DELIVERABLE 2.8 - urban track
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Figure 3.3<br />
D0208_STIB_M24.doc<br />
TIP5-CT-2006-031312 Page 27 of 44<br />
URBAN TRACK Issued: August 13, 2008<br />
Quality checked and approved by project co-ordinator André Van Leuven<br />
Differences between the conventionally alignment and the Viennese Curve<br />
The conventionally alignment (clothoid), considers the vehicle as a mass point moving longitudinally on<br />
the centre of the <strong>track</strong>. Superelevation is achieved by rotation in the <strong>track</strong> plane. The centre of gravity of<br />
the vehicle lies not on the centre of the <strong>track</strong> but in a certain height over the <strong>track</strong>. The Viennese Curve<br />
allows leading the vehicle in a way, that the curve driving powers directly affect the centre of gravity.<br />
Discontinuity in the vehicle movement, forces, peaks and jerks are going to be minimised with this new<br />
alignment.<br />
The smooth drive over, and the lower forces at the beginning and the end of the transition spiral cause<br />
fewer maintenance interventions and therefore reduced costs.
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