Client case

 

Mesurer la géométrie caténaire

 

Measure the catenary geometry

 

 

 

 

The traction current, supplied by substations distributed along the track, is carried by an overhead traction line to the locomotive, where it is captured by the pantograph’s collector rubbing against the contact wires.

Since continuous contact between the overhead traction line and the moving train must be maintained, it is crucial to precisely know the geometric position of the contact wires relative to the track, as well as the relative positions of the contact wires in complex areas.

 

 

 

 

 

 

     

 

Besoin du client

Besoin du client 

 

To know at rest the geometric position (the height and offset) of the contact wire(s) forming the catenary in relation to the track, and to be aware of the geometric position at the level of the catenary supports​

 

Types de données analysées

Types of data analyzed 

 

3D LiDAR point clouds

 

Méthode d'acquisition des données

Méthode d'acquisition des données

 

 

 

ESV measurement train

 

Méthode d'utilisation du jumeau numérique

Method of using the digital twin

 1

Identification and sampled extraction of the position of the catenary contact wires along the entire track
2

Extraction of attachment points​
3

Measurement of the height and offset of each contact wire​

 

 4

Identification of the support numbers to associate each attachment point with the corresponding pole number

 

Gains pour le client

Benefits for the client
  • Intervene with precision on sections of the track identified as problematic
  • Minimize the exposure of personnel to hazardous areas​
  • Optimize interventions through precise and objective monitoring: regularly available high-density data with centimeter-level relative accuracy​
    ​

 

 

question mark

What is LiDAR? 

LiDAR, which stands for "Light Detection and Ranging" or "Laser Imaging Detection and Ranging," is a distance measurement technique based on the analysis of the properties of a light beam returned to its emitter.

A LiDAR system is an optoelectronic device consisting of a laser emitter, a receiver with a light collector (such as a telescope or other optics), and a photodetector that converts light into an electrical signal. It also includes an electronic signal processing chain that extracts the desired information.

LiDAR data collected forms a three-dimensional point cloud with up to 7,000 points per square meter, providing a highly detailed and precise level of information.

 

Lidar

What is a Track Inspection Vehicle (TIV) ?

SNCF Réseau operates a fleet of trains known as Track Inspection Vehicles (TIVs), which are equipped with LiDAR measurement sensors and cameras.They inspect conventional lines every eight weeks, providing comprehensive and continuously updated data.The primary data used for gauge analyses are the LiDAR data collected by the TIVs.These point clouds, processed through a series of quality control phases, have a high density (several hundred points per square meter) and centimeter-level relative accuracy.