Nabochenko O. Increasing of efficiency of railway broken stone ballast

Object of research is the phenomenon of railway track geometry deterioration. The thesis is dedicated to increasing the efficiency of operation of the railway ballast in the point of view of ballast improvement by means of establishment of rational track design parameters and operating conditions. The method of finite differences, methods for multidimensional optimization, numerical methods for solving systems of ordinary differential equations for simulation, the method of molecular dynamics; methods of digital signal processing such as Fourier transform, Hilbert analysis techniques, clustering, and linear discriminant analysis are applied in the research. A method for measuring the degree of compaction of ballast is proposed. A new for Ukrainian railways approach is proposed for determining the degree of ballast layer compaction during track repairs with tamping machines. The method is based on a dynamic interpretation of the ballast impulse response, which is grounded on frequency analysis. Practical recommendations are proposed: the sleeper layout depending on the traffic density; the effective parameters of the dynamic stabilizers, and were adopted by the Main Management of Track Facilities of Ukrainian Railways.