The purpose of the Unmanned Diagnostic System for Track Geometry Quality Monitoring is to evaluate the track geometry quality by means of specific monitoring parameters like: track gauge, cant deficiency, twist, longitudinal levels (left and right), alignments (left and right). The System monitors these parameters in automated and remote way without the engagement of maintenance staff. It uses severa innovative technologies to acquire and to synchronize signals, also to elaborate and to memorize produced data. The System can be installed on commercial trains, without using a specifi c maintenance vehicle. With this approach it is possible to migrate from a diagnostic process with specialized staff, to the new unattended diagnostic system where staff presence is not required.
The System is composed by two main subsystems (On-board Subsystem, track-side Subsystem). The On-board subsystem acquires information on track geometry using the laser profi ling of the rails and the inertial movement unit. All these information are spatially synchronized and elaborated by the OpeRA (Optoelectronic Railway Analysis) component.
The On-board subsystem recovers measurements synchronization information from the ground equipment of the system (Points of Recalibration Services) and it uploads the information produced towards Data Elaboration Center. Track-side Subsystem through the Data Processing Center calculates the information produced by the on-board system to track geometry measurements to verify railway infrastructure quality.
A remote user can schedule and manage all maintenance activities related to the observed track geometry parameters.
The real innovative result is the “unattended” approach that is introduced in the current maintenance activities based and it is instead on a “guarded” approach.
For these reasons, the unattended diagnostic has a lot of advantages:
Increased security and availability of the railway line due to derailment prevention;
Increase of the railway lines submitted to maintenance;
Increase frequencies of acquired measurements;
Reduction in maintenance of management cost (staff, vehicles, stocks).
The system has been homologated for passengers transportation by ANSF (Italian National Agency for Railway Safety) on RFI (Italian Railway Owner) request. It is currently installed on Trenitalia vehicles and provides automatically information about the track geometry quality of the Italian railway infrastructure.
Moreover, other new diagnostics subsystems are going to be added to the initial ones and are related to vehicle status. Finally, the system is certifi able according to the Standard CENELEC in function of the desired SIL (Safety Integrity Level).
A System User can supervise the track geometry quality using an available interface from a specifi c web application. After an infrastructure anomalies detection and analysis, the user can define and send report through automatic forwarding via mail/fax. Moreover, the maintainer can defi ne and plan maintenance activities through historical data.
On-board Subsystem always checks the speed.
So, it is automatically activated when confi gurable speed level has been overpassed by the train (sampling start). From this event the System starts to measure the track geometry (measurements). During its movement the System recalibrates localization and measurement information using radiofrequency transmission data from Portal of Recalibration Services (running calibration). The System goes in stand-by and it suspends its measurement activities when train speed is under the configurable threshold.
When the train is in an established station, On-board Subsystem automatically uploads its data to Data Processing Center. Maintenance staff can remotely interact to Data Processing Center to analyze graphics, evaluate track geometry quality and manage all maintenance activities.