The head pressure pulse and the head pressure drop of a train are the pressure signals measured during the passage of the first few meters of the train at a fixed position in open air or in a tunnel, respectively. Train pressure pulses are part of the pressure loading on objects (like other trains) and persons. A new train is admitted to operation if measured data statistically satisfies certain threshold values. Nowadays train homologation in Europe predominantly relies on measurements, yet appropriate prediction tools are needed during the engineering process. The described pressure effects are well reported in literature and calculation methods are available providing for adequate accuracy. The methods are reviewed, examples from engineering applications and comparisons to data from full scale measurements are presented. The prevalent flow features are discussed covering a typical range of vehicle shapes and operational conditions (regional to high speed). The use of CFD methods is evaluated. The modeling error is estimated and error mitigation is attempted. A virtual homologation approach is proposed. The open fields of the issue are outlined.
Head pressure effects of trains and locomotives - engineering calculation approaches for homologation purpose
2009
1 Seite
Conference paper
English
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