Abstract
Mechanical models of a transport system “carriage - track” while crossing a joint irregularity are proposed. An investigation was conducted on the peculiarities of static, shock and dynamic interaction between the four-axle car and the track, considering tram wheelsets motion features over joint irregularity. A method to solve the equations of a mathematical model of static, shock and dynamic interaction is developed. Numerical analysis is used to determine deflections of the facing rail under the first sleeper for each phase of motion depending on motion phases, and car load and speed.
Highlights
In the current state of rail transport operating conditions, one should pay special attention to improving its design, as well as improving the reliability and operational properties of rolling stock
In this paper, based on the improved dynamic model that describes the deflections of the facing rail, considering the characteristics of rigidity and damping of the suspension of the tramcar and the ballast layer, the speed, loading and phase of movement of the tramcar through the current number of reduced masses of wheels on the rail, it was possible to calculate the parameters of post-impact interaction in the mechanical system "tramcar-rail track" at the phase of growth of deflections under the first sleeper
A method of sequential static-impact-dynamic calculation of deflections of the facing rail under the first sleeper in the growth phase was developed. This made it possible to note the phases of movement of the tramcar relative to the joint irregularity, its loading and speed, as well as the boundary conditions for fixing the facing and trailing rails, geometric and mechanical characteristics of rails and butt linings, sleepers and ballast layer
Summary
In the current state of rail transport operating conditions, one should pay special attention to improving its design, as well as improving the reliability and operational properties of rolling stock This is why in electric transport, scientific and technical works and research related to solving problems, devoted to the problem of ensuring the reliability of the tramcar-rail complex are important at the present stage of development. Its components and assemblies are affected by the interaction forces that arise between the cars and the trolleys, the trolleys wheel pairs and the upper structure of the track. They change both in time and in direction. Investigations of the mechanical interaction processes in the system «tramcar - track» are becoming important, as well as establishing new regularities based on the analysis results, noting the peculiarities of their static, impact and dynamic interaction while considering the operating, design and mechanical parameters of the tramcar and upper truck structure and motion phase of the tramcar through joint irregularity
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