A system to identify track sections producing excessive impacts on the undercarriage of high-speed rolling stock

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.

track irregularities, track sections labelling, higher level of impact, dynamics parameters, stress condition, methods for track diagnostics, short irregularities, vertical accelerations

1. Verigo M. F., Kogan A. Ya. Vzaimodeystvie puti i podvizhnogo sostava [Track interaction with the rolling stock]. Moscow, Transport Publ., 1986. 560 p.

2. Gracheva L. O. Vzaimodeystvie vagonov i zheleznodorozhnogo puti [Interaction of cars and railway tracks]. Trudy TsNII MPS [Proc. All-Union Cent. Res. Inst. of Railway Transport], 1968, no. 356. 206 p.

3. Danovich V. D., Mokriy T. F., Trubitskaya E. Yu. Issledovanie prostranstvennykh kolebaniy passazhirskogo vagona [The study of spatial fluctuations of the passenger car]. Dinamika i prochnost’ slozhnykh mekhanicheskikh sistem [Dynamics and strength of complex mechanical systems]. Kiev, Naukova dumka Publ., 1977. 58 p.

4. Efimov A. N., Malinskiy S. V., Pevzner V. O. Issledovanie spektral’nykh kharakteristik nerovnostey zheleznodorozhnogo puti [Study of the spectral characteristics of the railway track irregularities]. Issledovanie vzaimodeystviya puti i sovremennogo podvizhnogo sostava. Mezhvuz. sb. nauch. tr. DIIT [Investigation of the interaction of track and modern rolling stock. Interuniv. coll. sci. pap. DIRE]. Dnepropetrovsk, 1987, pp. 45 – 52.

5. Pevzner V. O. Deformativnost’ i stabil’nost’ puti [Deformability and stability of the track]. Put’ i putevoe khozyaystvo, 2005, no. 2, pp. 23 – 26.

6. Pevzner V. O., Suslov O. A., Romen Yu. S. O razrabotke dopolneniy k normativnoy dokumentatsii po differentsiatsii skorostey dvizheniya passazhirskikh i gruzovykh poezdov v mestakh deystviya preduprezhdeniy ob ogranichenii skorosti [On the development of additions to the standard documentation for the differentiation of the velocity of movement of passenger and freight trains in areas exposed to warnings about speed limits]. ‘Problemy vzaimodeystviya puti i podvizhnogo sostava’. Tr. mezhdunar. nauch.‑prakt. konf. [‘Problems of track interaction with the rolling stock’. Proc. int. sci.‑pract. conf.]. Dnepropetrovsk, 2013, p. 15.

7. Romen Yu. S. et al. Otsenka sostoyaniya puti na osnove modelirovaniya protsessov vzaimodeystviya v sisteme koleso — rel’s [Assessment of the treack state based on modeling of the interaction in the wheel — rail system]. Zheleznodorozhnyy transport, 2014, no. 5, pp. 58 – 62.

8. Khalupovich Kh. G. Issledovanie spektrov sluchaynykh kolebaniy v konstruktsiyakh podvizhnogo sostava zheleznykh dorog. Kand. tekh. nauk. diss. Avtoref. [Study of the spectra of random fluctuations in the constructions of railway rolling stock. Cand. tech. sci. diss. Synopsis]. 1968. 22 p.

9. Haigermoser A., Bezin Y., Coudert F., Eickhoff B., Grabner G., Kraft S., Thomas D., Zacher M. Der Einfluss der Gleislage auf das Fahrverhalten der Fahrzeuge — Ergebnisse aus dem EU-Projekt DYNOTRAIN [On the influence of track geometry quality on the running characteristics of the vehicles — results from the ECfounded research project DYNOTRAIN]. ZEVrail: Zeitschrift für das gesamte System Bahn, 2013, no. 137, pp. 159 – 171.

10. Neveu S., Vicol T., Coudert F. Use of axle-box acceleration to monitor track vertical geometry and short defects of rails. Proc. 2nd Int. Conf. on Railway Technology. Civil-Comp Press Pub., 2014, p. 83.