The Communication 
Based Train Control 
CBTC
Performing Safety Analyses 
and SysML Designs Conjointly : a Viewpoint Matter
Frédéric Thomas
Fabien Belmonte
Balise(s)
Data Commu-
nication System(s)
Wayside 
computer
Links to 
external
systems
Driver Interface
Onboard 
Controlers
Safety engineering
Requirements
Design
Operational
Functional
Safety 
Requirements
Preliminary Hazard Analyses (PHA)
System Hazard 
Analyses (SHA)
System engineering
... viewpoints ?
Constructional
... viewpoints
Alstom : to formalise the binding between system and safety activities, to concentrate the analyst on safety by using models
Obeo : to customize our generic Eclipse Viewpoint based tools (Obeo Designer) for railway safety engineers
IMOFIS : R&D project to develop an environment that assists safety engineers to analyse and verify systems (www.imofis.org)









Our objectives
Our approach
System Design
Safety analyses
Safety engineering
Requirements
System engineering
Interoperability
Traceability
Consistency
Contributions : 
We provide an integrated modelling framework gathering Safety and System design (based on Obeo Designer).
A safety viewpoint linked to a system viewpoint : ALEA Toolkit

Our approach :
It's not a new set of methods for safety analyses
It doesn't take into account all the safety activities
PHA, SHA and FMEA modeling : improve information search and communication (before many documents were parsed)
Viewpoints based approach help to cope with the complexity of a dual process : System and Safety

Future:
Operational feedback needed
Safety viewpoints is not only graphical representations, this is a set of filters and information synchonizations for specific concerns : bridge 
Links to fault tree analyzers / FMEA formalization (e.g. AltaRica)
RMF project for Requirement (?), textual edition (?)
A complex system :
A process :
Tool : http://www.obeodesigner.com


Keep in touch : http://modeldrivenblog.blogspot.com/
Twitter : @fthomas_fr
Creative commons 
Frits Ahlefeldt-Laurvig - http://www.flickr.com/photos/hikingartist/
Safety viewpoints
System
viewpoints
Analyses
Faul tree
FMEA
Risk 
analysis
1) Experiment with viewpoint based and model based technologies, the  production of tools for system engineers

2) Provide viewpoints to capture both Preliminary Hazard  Analysis (PHA) and System Hazard Analysis (SHA)

3) Provide interoperability with system design : SysML (SysML viewpoints are provided as inputs of this study) 

4) Provide consistency and traceability feedback to manage the complexity
Alea Toolkit : A viewpoint matter !


Conclusion
PHA
SHA
PHA
SHA
Alea Toolkit 
-
Applied metamodeL 
for safEty Analyses
A viewpoint matter
Safety 
Model
Preliminary Hazard Analysis (PHA)
System Hazard Analysis (SHA)
PHA viewpoint
SHA viewpoint
FMEA
....
System 
Model
System
(SysML)

This work is part of 
the IMOFIS R&D project
http://www.imofis.org
http://fr.wikipedia.org/wiki/Communication_based_train_control
http://cdn.streamlike.com/player/getEmbedFive?med_id=86bbb85818e97289&width=610&height=458
Demo : http://www.obeonetwork.org