Mechanical models of “railroad car-track” transport system for each phase of motion are developed. Particularities of dynamic interaction between the four-axle car and the track are studied by considering four phases of motion over joint irregularity. Methods for solving differential equations of the discrete-continuous system fluctuation are developed. Numerical analysis is used to determine deflections of the trailing rail under the first sleeper for each phase of motion depending on motion phases, and car load and speed.
The results of experimental investigation of boundary layer internal structure are presented in the case of an origin of laminar-turbulent transition, induced by moving cylinder. It is shown that the cylinder hesitations cause the earlier transition and the growth of transport coefficients in preceding to transition laminar boundary layer. The mechanism of intensification is grounded by changes of instability energy phases in the wall part of boundary layer, when critical thickness reaches.
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