Research on dynamic processes of wagon wheelsets with flat impact on rail

Stasys Steišūnas

Doctoral dissertation

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At running of a train on rails, natural vibrations of the rolling stock occur, whereas forced vibrations of the rolling stock are generated due to the track irregularities. Upon emergence of defects in the wheel rolling surface, the dynamic forces are operating during wheel-rail interaction, which put an additional load on the rail and the wheel. Due to the rolling stock vibrations induced by these forces, a traffic accident, noise and a negative effect on the passenger comfort during travel may occur. Ambient temperature and relevant track stiffness variations are not taken into consideration in the currently used dynamic rolling stock models, and this may influence the correctness of the determination of the dynamic parameters under study. At the present moment, mathematical models for interaction between the wheel with a defect and the rail give no assessment of the dynamics of the main mass of the whole vehicle and of the impact on the wheel-rail interaction process.

Topics, aim and tasks of research in the dissertation have been determined upon making the exhaustive analysis of the works by Lithuanian and foreign scholars on the topic of the rolling stock dynamics.

The first chapter gives an overview of the peculiarities of rolling-stock horizontal and vertical dynamics and provides an analysis of the dynamic models of the system “Vehicle - Track”; the wheel defects of the rolling stock and their effect on the vehicle movement have been studied.

The second chapter describes the developed mathematical model of a passenger car with wheel defects, moving on the rail surfaces of different quality, which provides an evaluation of the dynamics of railway track elements (rail, pad, ballast, and sub-ballast).

The third chapter provides calculations estimating an impact of wheel rolling surface defects and track unevenness as well as track construction stiffness variations on certain car construction elements, their results and analysis.

The fourth chapter focuses on the methodology for conducting experimental investigations under real operating conditions and the obtained research results. The received experimental results have been compared with the simulation findings and research results of other scientists.

The dissertation consists of the introduction, four chapters, general conclusions, a list of references, and a list of author’s publications on the topic of the dissertation.

A total of 14 papers have been published and 12 reports delivered on the topic of the dissertation at the Lithuanian and foreign conferences.

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Imprint No:
145×205 mm
162 p.
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