1 Introduction

1.1 Intention and Functions of ETCS Brake Model Tool

ETCS Brake Model Tool is intended for calculations related to ETCS brake models in accordance with [Subset 026-3]. It supports the following functions:

Calculation of fix brake models:
Based on the nominal forces or decelerations and the probabilistic characteristics of the train brakes, the on-board correction factors are calculated. Two algorithms are implemented: by Monte-Carlo simulation and by combinatorial logic.
Calculation of scenarios:
For a given set of train model (fix or flexible), track profile, national values and optionally normal service brake model, the brake distances and supervision limits are calculated.
Comparison of scenarios:
Two scenarios can be compared with respect to resulting brake distances and supervision limits.
Limits chart:
The speed and distance limits related to one or two scenarios are displayed graphically.
Export:
Export of all calculated data in text format (XML or CSV). Export of charts as vector graphic (SVG format) or bitmap (PNG format).

1.2 Terms and Abbreviations

Table 1: Terms and abbreviations


Term

Meaning





AD

Deceleration



BMI

Brake Model Index, determines which of the brake models created for a fixed train shall be used for calculations if no brake is inhibited by trackside



EBCL

Emergency Brake Confidence Level



project member

Data structures necessary for calculations. The following project members are implemented:

  • flexible train models
  • fix train models in three variants:
    • direct input of the correction factors
    • calculation of the correction factors by Monte-Carlo simulation in accordance with [prEN 17997-1]
    • calculation of the correction factors by combinatorial logic
  • normal service brake models
  • sets of national values
  • track profiles
  • scenarios
  • libraries containing some values that can be used for the Monte-Carlo simulations



In ETCS Brake Model Tool and thus also in this document the names are shortened to Tbu instead of T_brake_build_up and AD(V ) instead of A_brake_emergency(V).

1.3 Conventions

1.4 The Desktop

After starting ETCS Brake Model Tool, the graphical user interface will be started and the latest project will be loaded automatically.


PIC

Figure 1: The desktop


The desktop has the following areas:

1.5 Floating Window

If you right-click in the heading of a model graphics tab, you can select to show the model graphics tab in a separate floating window. This is helpful to compare two models, in particular if you’ve got a second physical screen. Multiple model tabs can be moved to the floating window and back again. Note that in the floating window, not all editing functions might be available.