THEORETICAL STUDIES ON THE PROCESS OF CHANGE OF THE TECHNICAL CONDITION OF FREIGHT CARS IN OPERATION

V. Y. Shaposhnyk

doi:10.15802/stp2018/140782

Authors

V. Y. Shaposhnyk Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Ukraine https://orcid.org/0000-0003-4701-6491

DOI:

https://doi.org/10.15802/stp2018/140782

Keywords:

freight car, reliability, life cycle of the car, technical condition diagram, technical availability ratio, car fleet

Abstract

Purpose. The scientific work is intended to investigate the technical condition of freight cars during their operation. The said purpose involves solving the following tasks: 1) to describe the technical condition of a freight car during the maintenance and repair period; 2) to determine the dependences of the probability of a freight car being in working condition during the life cycle; 3) to specify the expression for the technical availability ratio of the car fleet. Methodology. To achieve the purpose, the author examined the methodological approaches to the definition of various stages of the freight car life cycle. The system of change and transition of the technical condition of the freight car is described using differential equations. Findings. In the case of an unstable process of changing the technical condition of a freight car, the probabilistic characteristic of the appropriate life cycle stage depends on the amount of time. The intensity of the input and output flows are correlated with each other, taking into account the probability of a freight car being at the appropriate stage of its life cycle. Originality. Transitions from one car life cycle to another occur in discrete steps, that is, such transitions are characterized by a random process. The probability of a freight car being at the appropriate life cycle is determined by its prior technical condition. The total value of the set of all possible conditions consists of the Markov chain for random processes with random states and a continuous flow of time. The study resulted in obtaining, for the first time, of the dependence of the probability of a freight car being in working condition during the life cycle. Practical value. On the basis of the obtained definition for the probability of the freight car being in working condition the expression for the technical availability ratio of the car fleet was clarified.

Author Biography

V. Y. Shaposhnyk, Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan

Dep. «Cars and Cars Facilities», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipro, Ukraine, 49010, tel. +38 (056) 373 15 19,
Email: vladislav.sh91@gmail.com

References

Bosov, A. A., & Loza, P. A. (2015). Teoriticheskie osnovy ratsionalnogo soderzhaniya podvizhnogo sostava zheleznykh dorog: Monografiya. Dnepropetrovsk: Driant. (in Russian)

Bocharov, P. P., & Pechinkin, A. V. (2005). Teoriya veroyatnostey. Matematicheskaya statistika. Moscow: Fizmatlit. (in Russian)

Bulinskiy, A. V., & Shiryaev, A. N. (2005). Teoriya sluchaynykh protsessov. Moscow: Fizmatlit. (in Russian)

Dyurgerov, N. G., Morozkin, I. S., & Krotov, V. N. (2011). Vosstanovlenie i povyshenie iznosostoykosti detaley vagonov: Uchebnoe posobie dlya vuzov zheleznodorozhnogo transporta. Rostov-on-Don. (in Russian)

Korn, G., & Korn, T. (1974). Spravochnik po matematike dlya nauchnykh rabotnikov i inzhenerov: Opredeleniya, teoremy, formuly. Perevod s angliyskogo. Moscow: Nauka. (in Russian)

Muradyan, L. A., & Shaposhnik, V. Yu. (2017). Automatic identification of separate parts of vehicle with iplementation of new concepts of maintenance and repair implementation. Informacijno-kerujuchi systemy na zaliznychnomu transporti, 4, 44-50. (in Ukranian)

Muradyan, L. A., Shaposhnik, V. Yu., & Mishchenko, A. A. (2016). Methodological fundamentals of determination of unpowered rolling stock maintenance characteristics. Science and Transport Progress, 1(61), 169-179. doi: 10.15802/stp2016/61044 (in Russian)

Muradyan, L. A., Shaposhnik, V. Yu., & Podosenov, D. A. (2016). Improving the reliability of freight wagons with the use of new manufacturing technologies and regeneration of working surfaces. Electromagnetic compatibility and safety on railway transport, 11, 49-54. (in Russian)

Myamlin, V. V. (2014). Teoreticheskie osnovy sozdaniya gibkikh potochnykh proizvodstv dlya remonta podvizhno-go sostava: Monografiya. Dnepropetrovsk: Standart-Servis. (in Russian)

Myamlin, S. V., Muradyan, L. A., & Shaposhnik, V. Yu. (2016). Opredelenie strategii tekhnicheskogo obsluzhivaniya i remonta vagonnoy tekhniki. Transportnaya infrastruktura Sibirskogo regiona: Materialy VII-oy Mezhdunar nauchno-tekhnicheskoy konferentsii (Irkutsk, 29 march–1 april ), 2, 369-373. (in Russian)

Myamlіn, S. V., Muradyan, L. A., & Baranovskiy, D. M. (2015). Problem of the definition the «reliability» term. Methodology of construction and study the reliability of freight cars. Science and Transport Progress, 6(60), 110-117. doi: 10.15802/stp2015/57034 (in Ukranian)

Ustich, P. A., Ivanov, A. A., Mazhidov, F. A., & Saltykova, A. A. (2015). Ostatochnyy srok sluzhby detali i algoritm upravleniya fakticheskim sostoyaniem gruzovogo vagona s uchetom trebuemogo urovnya riska vozniknoveniya opasnogo otkaza. News of science: Proceedings of materials the international scientific conference (Czech Republic, Karlovy Vary ; Russia, Moscow, 30–31 August ), 83–94. (in Russian)

Reydemeyster, A. G., & Shikunov, A. A. (2015). Strength increase methods of the side frame of the bogie in three–piece trucks. Science and Transport Progress, 5(59), 141-149. doi: 10.15802/stp2015/55351 (in Russian)

Ustich, P. A., & Karpychev, V. A., & Ovechnikov, M. N. (2004). Nadezhnost relsovogo netyagovogo podvizhnogo sostava. Moscow: UMTs MPS. (in Russian)

Fomin, O. V. (2015). Improvement of upper bunding of side wall of gondola cars of 12-9745 model. Metallurgical and Mining Industry, 7(1), 45-48. (in English)

Myamlin, S. V., & Baranovskiy, D. (2014). The modeling of economic efficiency of products carriage-building plant in conditions of dynamic pricing. The Problems of the Transport Economics, 7, 61-66. doi: 10.15802/pte.v0i7.32096 (in English)

Pradhan, S. (2017). Application of Semi-Hertzian Approach to Predict the Dynamic Behavior of Railway Vehicles Through a Wear Evolution Model. Smitirupa Pradhan, Arun Kumar Samantaray, Ranjan Bhattacharyya. Journal of Friction and Wear, 38(6), 437-443. doi: 10.3103/s1068366617060125 (in English)

Shykunov, O. A. (2017). Three-element bogie side frame strength. Science and Transport Progress, 1(67), 183-193. doi: 10.15802/stp2017/92535 (in English)

Zhao, F., & Xie, J. (2014). Influence of small stress cycles on the fatigue damage of C70E car body. Journal of Mechanical Engineering, 50(10), 121-126. doi: 10.3901/jme.2014.10.121 (in English)