# DETERMINATION OF ENERGY LOSSES BY SHOCK ABSORBER IN A FREIGHT CAR AT CRASH MODE

## Authors

• Ya. V. Bolzhelarskyi Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Ukraine
• Yu. H. Sobolevska Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan (Lviv branch), Ukraine
• S. S. Dovganyuk Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan (Lviv branch), Ukraine
• A. V. Batig Lviv Research Institute of Forensic Science, Ukraine

## Keywords:

derailment, wheel-set, shock absorber, track panel, dissipation of energy, traction calculations, forensic science

## Abstract

Purpose. The purpose of this work is to determine the energy losses in the shock absorber of the freight car whose wheel-set moves in the derailed state on the track panel depending on the axle load and structural parameters of spring suspension. Methodology. On the basis of spring suspension construction analysis and operating principle of the friction shock absorber of the freight car bogie the authors provide the method for determining the energy absorbed by it. The calculations take the maximum values of the absorber elements displacement and the regulatory values of spring suspension parameters. Findings. The authors obtained the calculated formula for determining the energy absorbed by shock absorber for regulation-set mounting schemes of elastic bogie elements depending on the axial load. The mentioned curves are parabolic. Originality. The work examines the crash mode of the wheel-set movement on the track panels after its derailment. It is shown that the energy dissipation in the shock absorbers is the reason for increase in resistance to rolling stock movement. The formulas for calculating the amount of energy dissipated in the shock absorber with a maximum displacement of its elements are derived. This energy depends on the axle load and structural parameters of spring suspension. Practical value. The proposed method allows setting the value of the additional resistance to motion that occurs in crash mode which makes it possible to increase the accuracy of traction calculations.

## Author Biographies

### Ya. V. Bolzhelarskyi, Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan

Dep. «Lokomotives», Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel. +38 (056) 776 59 47

### Yu. H. Sobolevska, Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan (Lviv branch)

Dep. «Fundamental Disciplines», Iv. Blazkevych St., 12-а, Lviv, Ukraine, 79052

### S. S. Dovganyuk, Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan (Lviv branch)

Iv. Blazkevych St., 12-а, Lviv, Ukraine, 79052

### A. V. Batig, Lviv Research Institute of Forensic Science

Lab. «Railway Transport Researches», Lypynskyi St., 54, Lviv, Ukraine, 79024, tel. +38 (032) 232 70 61

## References

Shadur L.A., Chelnokov I.I., Nikolskiy L.N., NikolskiyYe.N., Koturanov V.N., Proskurnev P.G., Kazanskiy G.A., Spivakovskiy A. L., Devyatkov V.F. Vagony [Cars]. Moscow, Transport Publ., 1980. 439 p.

Vershinskiy S.V., Danilov V.N., Khusidov V.D. Dinamika vagona [Dynamics of a car]. Moscow, Transport Publ., 1991. 360 p.

Garg V.K., Dukkipati R.V., Pankin N.A. Dinamika podvizhnogo sostava [Dynamics of rolling stock]. Moscow, Transport Publ., 1988. 391 p.

Grebenyuk P.T., Dolganov A.N., Skvortsov A.I. Tyagovyye raschety [Traction calculations]. Moscow, Transport Publ., 1987. 272 p.

Domin Yu.V., Cherniak H.Yu. Osnovy dynamiky vahoniv [Fundamentals of cars dynamics]. Kyiv, KUETT Publ., 2003. 270 p.

Komarova A.N., Boronenko Yu.P. Otsenka energoeffektivnosti netyagovogo podvizhnogo sostava [Estimation of energy efficiency of non-tractive rolling stock]. Nauka ta progres transportu – Science and Transport Progress, 2013, no. 1 (43), pp. 149-153. doi:10.15802/stp2013/9616

Kuzmich V.D., Rudnev V.S., Frenkel S.Ya. Teoriya lokomotivnoy tyagi [The theory of locomotive traction]. Moscow, Marshrut Publ., 2005. 448 p.

Myamlin S.V. Modelirovaniye dinamiki relsovykh ekipazhey [Modeling the dynamics of railway vehicles]. Dnepropetrovsk, Novaya ideologiya Publ., 2002. 240 p.

Pravila tyagovykh rasschetov dlya poyezdnoy raboty [Rules of traction calculations for train operation]. Moscow, Transport Publ., 1985. 287 p.

Sokol E.N. Skhody s relsov i stolknoveniya podvizhnogo sostava (Sudebnaya ekspertiza. Elementy teorii i praktiki) [Derailment and collision of rolling stock (Forensics enquiry. Elements of theory and practice)]. Kiev, Transport Ukraїni Publ., 2004. 368 p.

Sokolov M.M., Varava V.I., Levit G.M. Gasiteli kolebaniy podvizhnogo sostava [Shock absorbers of rolling stock]. Moscow, Transport Publ., 1985. 216 p.

Instruktsiia z tekhnichnoho obsluhovuvannia vahoniv v ekspluatatsii: TsV-0043 [Manual maintenance of cars in operation]. Kyiv, DP PKTBTSV Ukrzaliznytsi Publ., 2008. 222 p.

Lindgreen E., Sorenson S.C. Driving resistance from railroad trains. Copenhagen, DTU Publ., 2005. 86 p.

Lukaszewicz P. Energy consumption and running time for trains: modelling of running resistance and driver behaviour based on full scale testing. Doct. Thesis. Stockholm, KTH Publ., 2001. 154 p.

López I., Busturia J.M., Nijmeijera H. Energy dissipation of a friction damper. Journal of Sound and Vibration, 2004, vol. 278, issue 3, pp. 539-561. doi:10.1016/j.jsv.2003.10.051.

Lopez I., Nijmeijer H. Prediction and validation of the energy dissipation of a friction damper. Journal of Sound and Vibration, 2009, vol. 328, issue 4-5, pp. 396-410. doi:10.1016/j.jsv.2009.08.022.

Merideno I., Nietoa J., Gil-Negrete N., Giménez Ortiz J.G., Landaberea A., Lartza J. Theoretical prediction of the damping of a railway wheel with sandwich-type dampers. Journal of Sound and Vibration, 2014, vol. 333, issue 20, pp. 4897-4911. doi:10.1016/j.jsv.2014.05.034.

2016-08-25

## How to Cite

Bolzhelarskyi, Y. V., Sobolevska, Y. H., Dovganyuk, S. S., & Batig, A. V. (2016). DETERMINATION OF ENERGY LOSSES BY SHOCK ABSORBER IN A FREIGHT CAR AT CRASH MODE. Science and Transport Progress, (4(64), 15–23. https://doi.org/10.15802/stp2016/77838

## Section

OPERATION AND REPAIR OF TRANSPORT MEANS