french institute of science and technology for transport ... - Ifsttar

Research orientation 2_Transport system quality, safety and optimization
Maintenance of high speed
railway lines
The task of Diaghist
How can we improve the predictive diagnosis of the
condition of TVM430 track circuits, which are one of
the essential components of railway signalling on high
speed lines? The ANR Diaghist project (1) which ended in
2011 answers this question which is crucial for SNCF
with a highly innovative and ambitious demonstrator.
The concept of conditional preventive maintenance is
gaining currency at the present time. In particular, this concept
makes it possible to foresee the need for maintenance
operations and perform them at the best time, and therefore
for the lowest cost, and also limits systematic preventive
maintenance operations and traffic interruptions.
The large number of track circuits (several tens of thousands)
and their maintenance costs (several hundred K€ par year)
(1) The project, which brought together SNCF, IFSTTAR and the UTC,
was launched in 2007.
Interface for the expert labelling of inspection signals.
justify the attempt to find optimized techniques for monitoring
their condition in order to conduct prevent maintenance
as efficiently as possible.
This project has resulted in a number of methodological
advances. The most important of these is the development
of generative parametric diagnostic models, and, more particularly,
the integration of knowledge about the problem to
be resolved and/or about the data in the decision-making
algorithms.
This application is based on using the large volume of unlabelled
data that are collected every 15 days by the inspection
car while drawing on the expertise SNCF has built up to label
a small part of it which will then be used to train a statistical
model very effectively. In particular, we have formalized the
training problem for the Independent Factor Analysis model
in the case of imprecise or uncertain labels. This work could
be extended to include all latent variable generative models
with an evidence-based formulation which generalizes
several probabilistic frameworks (e.g. semi-supervised or
partially supervised).
The classification algorithms have been implemented in the
“Diaghist” demonstrator which has been mounted on the
SNCF IRIS320 inspection car. The quality of the results has
led to the transfer of the tools to the SNCF Infrastructure
Directorate in order to trial the concept of the conditional
preventive maintenance of track circuits on a pilot At a later
stage, it would be possible to envisage extending this new
surveillance concept to other industrial domains.
Interface for the
expert labelling of
inspection signals.
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@ CONTACT
latifa.oukhellou@ifsttar.fr
THESES
Jeong-Hwa An_GRETTIA
Choosing a sustainable transport
system. Comparative analysis
of new guided transport systems
(11/04/2011)
Adrien Bak_IM-LIVIC
Stereo motion cooperation
for detecting dynamic objects
(14/10/2011)
Vincent Boccara_LPC
Skill development in the learning
situation during initial car
driving training. Combined
contributions of ergonomic
psychology and social psychology
(13/12/2011)
Zohra Cherfi_GRETTIA
Complex system diagnosis in
unsupervised and partially supervised
situations. Application to railway
track circuits (10/10/2011)
Nizar Fakhfakh_ESTAS
Use of stereovision for the threedimensional
detection and
positioning of moving objects
in complex environments –
Application to level crossings
(14/06/2011)
Haïfa Fares_LEOST
Distributed MIMO systems for future
cellular systems and transport
applications (07/12/2011)
Duy-Hung Ha_GRETTIA
Statistical and probabilistic
modelling of time headways
at different traffic levels
(11/05/2011)
Marjolaine Masson_LESCOT
Rehabilitation of attentional
processes among a population
of patients with cranial trauma:
application to car driving
(16/03/2011)
Ladislav Motak_LESCOT
The contribution of metacognitive
theories to the study of self-regulation
in elderly drivers (05/12/2011)
Judith Princeton_GRETTIA
Innovative strategies for road network
management and sustainable mobility.
A new approach to evaluation
(09/11/2011)
Hong Tu Luu_IM-LIVIC
Development of methods
to reduce vehicle fuel consumption
while maintaining safety and
comfort: a trade-off between
economics and the environment
(27/06/2011)
Maud Ranchet_LESCOT
Effect of Parkinson’s disease on car
driving (30/11/2011)
Dung Nghi Truong Cong_LEOST
Comparing image sequences
in order to track deformable objects
in colour video footage. Application
to urban transport site surveillance
(11/01/2011)
Nicolas Viandier_LEOST
Modelling GNSS pseudorange
errors in a transportation
environment in order to improve
the performance of positioning
(07/06/2011)
ANNUAL REPORT 2011 ifsttar.fr