Yu.V. Bocharnikov, M.P. Bader, V.R. Antonec
The paper investigates the effect of voltage quality on the level of electromagnetic noise in supply and signal circuits of the track circuit equipment. The study is based on the developed simulation model of the electric traction system relying on quantitative estimation criteria for electromagnetic noise.
M.V. Shevlyugin, K.S. Zheltov
The power indexes of the Moscow underground operation are determined. Energy saving due to the regenerative braking coupled with using the capacitive energy storage devices(CESD) fitted on-board of the electric rolling stock (ERS) is evaluated. Variants of the CEDS’ hooking up to the power circuits of ERS are presented. The basic technical and economic parameters of CESD’ for receiving the regenerative energy onboard the ERS are defined.
The parameters of electric energy quality at a wiring point of powerful supporting substations of a system of traction electric power supply of alternating current with rectifying inverting converters for three-phase supplying power line of 110 kW are defined in the paper by computer modeling. The schemes of smoothing filters aimed for improvement of these parameters are presented along with the corresponding calculations.
N.N. Lyapushkin, A.N. Savos’kin
The paper is analysing the dependence of the traction force between the wheel and the rail on the speed of sliding and rolling of the wheel along the rail. The calculations for traction force were made in assumption that it may be presented as a total breakout force in acquisition currently present on the interaction area. The results of the calculations are compared with experimental results, and a good matching of the developed theoretical model with experiment is demonstrated.
V.S. Popov, A.V. Hristoforova
A problem of hydroelasticity for a hydrodynamic isolation pad of a vehicle with impermeable walls, the width of which is large in comparison to length, is solved in paper. The pressure distribution of fluid located in a space between the vibrator and stator in case of a forced flow of a working fluid is determined along with the amplitude and phase frequency characteristics of the isolation pad. Finally, the resonant frequencies of the studied isolation pad are obtained.
The paper is investigating the effect of hydraulically free water in a sand-bag in the interstice between the parts of stones in the track subsidence. It is proved by experiment that the water pressure arising due to a dynamic load may cause considerable ground deformation, and therefore, may contribute the sand-bag development and track subsidence. It is demonstrated that the process is stopped once the water is extracted out of the sand-bag.
Examples of application of mathematical models of vessels motion to designing of canals and switching area are presented in the paper. A model example of a tanker is investigated and compared with the experimental data.
L.Yu. Kataeva, V.B. Karpuhin
The paper is investigating multistep methods for solving ordinary differential equation. The Gear method is recommended for numerical modeling of dynamic systems described by stiff ODE. The brief description of the program realization in C++ is presented. The case of changing order is also investigated.
V.M. Ponomarev, V.A. Rudakov
The paper contains analysis of failures of devices in car fleet. It is shown that security violation may easily lead to a breakdown. These reason-consequence relations are presented in the form of a multiplayer network model. The presented model along with the corresponding statistical model allows a simulation of device failure probability.
P.F. Bestem’yanov, A.M. Romanchikov
A mathematical model of the train motion for coordinate interval regulation is described. The model is non-linear, taking into account a variety of factors including dependence of the resisting forces on speed, non-linearity of traction, etc. The method of quality control estimation for coordinate interval regulation is proposed.
The paper contains a searching algorithm for cars involved in producer surveys. The main problems of cars maintenance are revealed and analyzed. Finally, the results of possible application of the method are discussed.
K.A. Sergeev, I.V. Gundaev
The paper is concerned with theoretical issues of technological development of the car shed system. A simulation model for analysis of manufacturing processes of the car-repairing plants is presented.
I.G. Kiselev, V.V. Galov
The paper is concerned with numerical simulation of the heat exchange process for of urea-formaldehyde concentrate in tank wagons. The analysis revealed the main drawbacks and possible ways of their elimination.
V.I. Kupaev, S.V. Rasskazov
The paper contains description of the order of testing and crucial parameters characterising the efficiency of operation of ventilation installations. The method of estimation of operation efficiency of ventilation installations based on the current regulations is presented.