Application Note: Dynamic Parameters Testing on Tilt Train

Since 2000, fast tilting train EMG 310 (Pendolino or InterCity Slovenia ICS) operates between the stations Maribor – Ljubljana – Koper. At the start of operation of tilting train EMG 310 the measurements of dynamic parameters of the line were needed due to increased speed. On the routes over which trains with tilting included drive, in accordance with the Regulations of the superstructure of lines, the value of the dynamic parameters of forces between wheel and rail has to be measured. The purpose of the project is to carry out measurements of dynamic parameters using a tilting train EMG 310, and in this way to locate possible local bad sectors on the line.

INTRODUCTION

Measurements must be performed in accordance with Slovenian Railway transport regulations for tilting trains. This measurements must be carried out every 12 months. The purpose of the project is to carry out measurements of dynamic parameters, using tilting train and with use of the results increase max. allowed speed on the trail.

In parallel with the measurements of dynamic parameters the speed and position (location) of a train are also measured with GPS equipment.

One of the most important value during the measurement is ratio between lateral and vertical acceleration (Y / Q), which represents the coefficient of derailment. The ratio Y / Q is important because it indicates the possibility / probability of derailment of the rail vehicle.

MEASUREMENT SETUP

USED EQUIPMENT

• DEWE DAQ system with 32 channels
• DEWESoft DS-CAM-120 camera
• 2 axis DC accelerometers
• Triaxial IEPE sensor for Human Body Vibration
• 1Hz GPS receiver
• GPS Leica Viva

USED SOFTWARE

• Dewesoft X
• Human Body Vibration add-on for Dewesoft X

TEST SETUP

The following picture represents a screenshot of the main display built with Dewesoft including some of the main parameters that have to be visualised during the dynamic tests.

ANALYSIS

The results of the measurements are processed by segment of the rail. In addition to the measured speed minimum and maximum measured values of dynamic parameters are shown - the average lateral acceleration, lateral forces and derailment coefficient.

Averaged lateral acceleration, derailment coefficient

CONCLUSION

This is an application of DEWESoft® acquisition and post processing system in the railway field. With online math possibilities inside Dewesoft X all important parameters are monitored. Customer must take a special care when mounting sensors on the train body and on the roof.

If you like further information on the DEWESoft Data Acquisition Systems or Software and reside in Australia or New Zealand, please contact Metromatics on +61 7 3868 4255 or sales@metromatics.com.au  

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