Вестник Научно-исследовательского института железнодорожного транспорта (Apr 2015)
A system to identify track sections producing excessive impacts on the undercarriage of high-speed rolling stock
Abstract
Considerations relate to the stages of development and output evaluation of workability of a system for continuous control of parameters incidental to ‘undercarriage/track’ dynamic system (CPDS), aimed to identify track sections responsible for excessive impacts on the undercarriage along the vertical and horizontal transverse axes. Monitoring aims to produce a continuous evaluation of the need to perform a non-scheduled examination of specific track sections. CPDS System does not replace the existing methods for track diagnostics but elaborates them. CPDS System was developed on the basis of a standard diagnostic facility and was installed onboard ‘Sapsan’ trains No. 2 and No. 6. Indication of track conditions is focused on indicators incidental to excessive reaction levels in the EMU vehicle dynamic system manifested on certain track sections. Analysis of measurements (indications) performed along the line Moscow - St.-Petersburg have shown high recurrence when registering track sections (their length and seizure time) producing excessive impacts on the bearing elements of a vehicle. Analysis of impacts on dynamic burden of undercarriage produced by track irregularities was performed as a part of researches held at the time of EMU Desiro RUS (‘Lastochka’) running dynamic-strength tests on the line. On the grounds of above researches an Engineering Specification for the second generation of CPDS System has been produced to include a requirement for strain-measuring channels, which will allow to continue and promote researches related to the impact of vertical track irregularities of various length (less than 3 m, 3 - 25 m and above 25 m) upon stress formation in the bearing elements of a vehicle.
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