DELIVERABLE 2.8 - urban track

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Figure 3.17 D0208_STIB_M24.doc TIP5-CT-2006-031312 Page 38 of 44 URBAN TRACK Issued: August 13, 2008 Quality checked and approved by project co-ordinator André Van Leuven Figure 3.17 shows a typical time plot along the clothoid with constant cant gradients before the reconstruction and afterwards the Viennese transition curves with Viennese cant gradients, the switch connection is in the middle of picture. The investigated transition curves are outmost left and right in the picture. Comparison old and new alignment design track 1 sections A and B travelling direction
D0208_STIB_M24.doc TIP5-CT-2006-031312 Page 39 of 44 URBAN TRACK Issued: August 13, 2008 Quality checked and approved by project co-ordinator André Van Leuven By means of the marker signals, the time plots were recalculated to path plots and the evaluation of the vehicle’s relative accelerations related to the track induced accelerations is done for every channel. A deterministic and statistic evaluation is performed. The results are for the both directions: Table 3.1 Relative accelerations mean bottom of vehicle statistic and deterministic results travelling direction Empiric dispersions 1. measurement 06. August 2001 2. measurement 13. August 2001 3. measurement 27. August 2001 FB-AU track 1 Region A Clothoid with constant cant gradient 0,109 Viennese curve & cant gradient 0,074 Viennese curve & cant gradient 0,086 FB-AU track 1 Region B Clothoid with constant cant gradient deterministic evaluation: Large oscillations AU-FB track 2 Region C No measurement Undefined intermediate state Clothoid with constant cant gradient 0,153 Viennese curve & cant gradient deterministic evaluation: reproducible Table 3.2 Relative accelerations mean bottom of vehicle statistic results reverse direction Empiric dispersions 1. measurement 06. August 2001 2. measurement 13. August 2001 3. measurement 27. August 2001 FB-AU track 1 Region A Clothoid with constant cant gradient 0,125 Viennese curve & cant gradient 0,090 Viennese curve & cant gradient 0,089 FB-AU track 1 Region B Clothoid with constant cant gradient: 0,171 Viennese curve & cant gradient 0,124 AU-FB track 2 Region C No measurement Undefined intermediate state Clothoid with constant cant gradient 0,142 Viennese curve & cant gradient 0,153 Viennese curve & cant gradient 0,132 Beside the reduction of the dispersions the results of the measurements from the time plot show: At the bogie: the differences between the two types of geometry cannot be seen due to the large amplitudes; the running characteristics are dominating. Much higher accelerations at the roof than at the bottom. Vehicle body has smaller non-compensated accelerations on the newly tamped track; it is guided calmly. When compared to conventional clothoid curves, the vehicles run more deterministic than stochastic with much smaller amplitudes on the Viennese transition curves. The fluctuation of non-compensated acceleration is evident smaller and the empiric dispersions are reduced. Is valid independently from the travelling direction.
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