Generally, the equivalent conicity function (ECF) is denoted by at 3mm (?3mm) and a Nonlinearity Parameter (NP). NP describes nonlinearity of ECF its influence on vehicle design explored thoroughly, however, NP’s role in track maintenance not researched yet. This paper investigates actions dynamics with help vs ?3mm scatter plots database. The database constructed combining measured worn wheel ...

This research presents a model of a complex dynamic object running on a multi-core system. Discretization and numerical integration for multibody models of vehicle rail elements in the vertical longitudinal plane fluctuations is considered. The implemented model and solution of the motion differential equations allow estimating the basic processes occurring in the system with various external i...

In order to prevent unpleasant incidents, preservation high-speed railway vehicle stability has vital importance. For this purpose, railway vehicle is modeled using a 38-DOF. This paper presents an investigation on limit cycle and bifurcation of high speed railway behavior. It is revealed that the critical hunting speed decreases by increasing the wheel conicity. Also the critical hunting speed...

The paper discusses on the use of an optimal LQG control design to improve the vehicle curving performance at increased running speed, employing only local (rail vehicle-based) signal measurements. It addresses the fundamental problem related with straightforward feedback control, and introduces the commercially-used command-driven with precedence scheme. A combination of simulation results and...

The Rolling Stock Rotation Problem is to schedule rail vehicles in order to cover timetabled trips by a cost optimal set of vehicle rotations. The problem integrates several facets of railway optimization, i.e., vehicle composition, maintenance constraints, and regularity aspects. In industrial applications existing schedules often have to be re-optimized to integrate timetable changes or const...

the vibrations produced by trains include two parts which are deterministic and random vibrations. due to variation of dynamic loads and patterns of load-time, the random vibration of moving train is one of the most important issues in the field of railway engineering. one of the important sources in producing the train vibrations is rail roughness and irregularities. in this paper, responses o...

The presented article aims at assessment of the influence test bench design on cooling performance a rail vehicle brake disc. is designed for experimental analyses vehicles' components. work includes an introduction to solved problem, as well description importance airflow simulations in virtual environment. Creation geometrical model and its most important features are described. research perf...