One critical component of the maintenance of a rail infrastructure is the detection of the wear and tear of the rails and points. Presently this is usually done by track-walkers or by specialised inspection trains. Witt offers a system to undertake an evaluation of the points. The operating principle of the system is based on the impact / the vertical acceleration a train wheel executes while travelling via the tracks. The value of these impacts is characteristic for the system status or the wear and tear respectively.
API (Automatic Point Inspection) is to be placed temporarily close to the relevant point.
The aim of this system is to detect in an early stage damages and changes to tracks or points in order to get an indication about required maintenance activities. This results in optimization of maintenance planning (optimized use of infrastructure components and extended lifetime) as well as reduced noise emission during train transit.
In order to achieve this the system ESAH-M was developed and successfully tested and implemented in cooperation with Deutsche Bahn.
The operating principle of the system is based on the impact a train wheel executes while travelling via the rail switch from wing rail to frog or vice-versa. These impacts during the crossing of a train are characteristic for the track status or the wear and tear respectively.
The system is installed in the tracks. It is capturing the accelerations of the tracks / points through a tri-axial sensor that is connected magnetically directly at the frog. At the same time the speed of the overrunning axles is measured and computed by inductive sensors. After a train crossing, the results are shown directly on the display and kept in the device for storage. Optionally the measurements are transmitted via SMS using an integrated GSM module. The simple battery powered device including the sensors is mounted in less than one minute in the track and is at once operational.
A detailed description can be found in the data sheet
or in the technical description: