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:
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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.
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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.
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Comparison of scenarios:
- Two scenarios can be compared with respect
to resulting brake distances and supervision limits.
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Limits chart:
- The speed and distance limits related to one or two scenarios
are displayed graphically.
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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
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Term |
Meaning |
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AD |
Deceleration |
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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 |
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EBCL |
Emergency Brake Confidence Level |
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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
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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
- A term in slanted letters indicates a term with a certain meaning within
ETCS Brake Model Tool, e. g. a type of data objects.
- A term in bold letters indicates a menu, command or button name.
- A term in ’single quotation marks’ indicates a fixed term not directly
related to ETCS Brake Model Tool.
- A term in ”double quotation marks” indicates a name or a quote. It is
also used to indicate, that a term or statement is not literally correct
(e. g. a simplification or common but imprecise wording).
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.
The desktop has the following areas:
- The menu bar.
- The tool bar.
- The member tab pane, with the active member presented in the active
tab. If you click on some project member in the project tree or if you
create a new project member, all its data will be shown in the member
tab.
- If no brake failure model or brake component is selected:
- The project tree showing the files in the project directory and
sub-directories.
- A panel showing some (optional) description of the member
currently shown in the member tab.
- If a fix train model by combinatorial logic is active and a brake failure
model is marked: A panel showing the properties of the marked brake
failure model, see figure 9. If you click the mouse outside the brake
failure models table or a component block, the project tree is shown
again.
- If a fix train model by Monte Carlo simulation is active and a brake
component is selected: A panel showing the properties of the marked brake
component, see figure 17. If you click the mouse outside the brake
failure models table or a component block, the project tree is shown
again.
- A message output window displaying hints, warnings or errors occurring
during file operations and calculations.
- A status bar displaying hints, if an action could not be performed.
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.