Train tilting permits a train to travel at a high speed while maintaining an acceptable passenger ride quality with respect to the lateral acceleration, and the consequent lateral force, received by the passengers when the train travels on a curved track at a speed in excess of the balance speed built into the curve geometry. A design issue associated with the train carbody tilting is needed to keep the pantograph centred with respect to the catenary that runs aligned to the rails. The typical solution is to mechanically link the pantograph to the bogie, but recent tilting trains have the pantograph connected to the carbody roof while a position servoloop continuously controls the pantograph position such to keep it centred with the catenary. This new design allows a gain in the useful volume inside the carbody. Two position transducers are used to provide redundant information on the pantograph position to close the feedback loop and perform system monitoring. The monitoring functions presently implemented in the pantograph position controls are able to detect the servocontrol failures, but in the case of conflicting information from the two position transducers they are not always able to sort out which of the two transducers has failed. As a result, a position transducer failure always leads to disabling the tilting function and reducing the train speed, and then to removal and replacement of the entire pantograph, because the functionality of each individual transducer can only be checked at shop level. An advanced diagnostic system was hence developed that can both identify the presence of a failure and recognize which of the two position transducers is the failed one. In the case of a transducer failure it is thus possible to isolate the failed transducer and keep the pantograph position control operational, thereby retaining the train tilting function. A further merit of the advanced diagnostic system is the reduction of maintenance time and costs because the failed transducer can be replaced without removing the entire pantograph from the train. The general architecture of this innovative diagnostic system, the associated algorithms, the mathematical models for the system simulation and validation, the simulation results and the possible future developments of this health management system are presented in this paper.
Advanced diagnostics for a position control system of the pantographs of tilting trains
2012
20 Seiten, 10 Bilder, 6 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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British Library Conference Proceedings | 1998
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British Library Online Contents | 1993
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Engineering Index Backfile | 1939
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British Library Online Contents | 2005
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