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1
Content available Methods of calculation line optimum travel of trains with consideration of longitudinal dynamic efforts
Lingaitis L., Vaičiūnas G., Liudvinavičius L., Jevdomacha G.
Transport Problems
|
2013
|
T. 8, z. 2
25--34
EN
The paper examines the main provisions of the methods used for optimization of station-to-station travel time taken (according to the criteria of minimum fuel consumption for haulage) for freight long train timing with consideration of longitudinal dynamic efforts. A hybrid mathematical model of long train travel is developed, where in one case of travel the train is considered as a flexible non-extensible line with a variable running weight, in other cases the train is considered as a system of weights connected by nonlinear deformable elements with a consideration of gap clearance in a draft. The model allows essentially reducing the time of solving the problem. The problem of selecting an optimum mode of train operation with consideration of longitudinal dynamic efforts and use of method of dynamic programming in a discrete form was set..
RU
Рассмотрены основные положения методики оптимизации (по критерию минимума расхода топлива на тягу) перегонных времен хода к графику движения грузовых длинносоставных поездов с учѐтом продольных динамических усилий. Разработана гибридная математическая модель движения длинносоставного поезда, в которой в одних случаях движения поезд рассматривается, как гибкая нерастяжимая нить с переменной погонной массой, в других, как система масс, соединенных нелинейными деформируемыми элементами, учитывающими наличие зазоров в упряжи. Такая модель позволяет существенно сократить время решения задачи. Поставлена задача выбора оптимального режима ведения поезда с учетом продольных динамических усилий с использованием метода динамического программирования в дискретной форме
2
Content available Research on selection of modes of driving heavy trains on main IXB and IXD corridors of JSC "Lietuvos gelezinkeliai"
Lingaitis L., Dailydka S., Jevdomacha G.
Transport Problems
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2012
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T. 7, z. 4
39-47
EN
Optimum haul times of running for a train schedule and mode diagrams corresponding thereto calculated using the program system passed operational check with the purpose to obtain reliable statistical estimation of their impact on reduction of the fuel consumption on haulage of trains and level of longitudinal dynamic efforts. The optimal speed of the train is chosen (defined) taking into account the given travel time and the longitudinal track profile, when the Diesel locomotive fuel consumption are minimum. Results of experimental research with long trains, weight up to 8000 tons, are presented herein. Experimental operational trips confirmed the correctness of theoretical preconditions and techniques of selection of optimum modes of driving of long trains, demonstrated potential for decrease of level of longitudinal dynamic efforts by 1.5–2 times and achievement of fuel economy on haulage up to 5–8 % when such trains move on a site with the undulating way profile.
3
Content available Locomotive kinetic energy management
Liudvinavicius L., Lingaitis L.
Transport Problems
|
2011
|
T. 6, z. 3
135-142
EN
The paper addresses some basic theoretical and engineering problems of electrodynamic braking, presenting methods of regenerative braking returning energy to contact network or the energy storage batteries. The paper presenting the non-traditional structural schemas of the starting of DC/DC, AC/DC, AC/AC power systems locomotives 800 kW-6000 kW diesel engines using the energy storage batteries (block of supercapacitors).
4
Content available Passenger transportation problems of the public limited liability company "Lietuvos gelezinkeliai"
Dailydka S., Lingaitis L.
Transport Problems
|
2009
|
T. 4, z. 3, cz.2
45-50
EN
The article provides an overview of passenger transportation on local and international routes by the Lithuanian railways. It identifies the reasons due to which passenger transportation has become increasingly loss-making. Also, factors that may encourage a greater number of people to travel by train are disclosed. The development of this sector up to 2030 is reviewed, i.e. a forecast for increasing the number of passengers, a perspective for the development of electric, diesel trains, passenger wagon fleet, and the levels of estimated investments are provided. It was established that after implementation of the measures envisaged, losses in the passenger transportation field could be cut by 2–3 times.
5
Content available New technical solutions of using rolling stock electrodynamical braking
Liudvinavičius L., Lingaitis L.
Transport Problems
|
2009
|
T. 4, z. 2
23-35
EN
The paper considers some theoretical and practical problems associated with the use of traction motor are operating in the generator mode (in braking). Mathematical and graphical relationships of electrodynamic braking, taking into account the requirements raised to braking systems in rail transport are presented. The latter include discontinuity of braking process, braking force regulation, depending on the locomotive speed, mass, type of railway and other parameters. Schematic diagrams of the locomotive braking and ways of controlling the braking force by varying electric circuit parameters are presented. The authors suggested contact-free regulation method of braking resistor for controlling braking force in rheostatic braking, and resistor parameters regulate with pulse regulation mode by semiconductor devices, such as new electrical components for rolling stock - IGBT transistors operating in the key mode. Presenting energy savings power systems, which are using regenerative braking-returning energy and diesel engine or any form of hybrid traction vehicles systems, circuit diagrams, electrical parameters curves.
6
Content available Locomotive energy savings possibilities
Liudvinavičius L., Lingaitis L.
Transport Problems
|
2009
|
T. 4, z. 3, cz.1
35-41
EN
Economic indicators of electrodynamic braking have not been properly estimated. Vehicles with alternative power trains are transitional stage between development of pollution- free vehicles. According to these aspects the investigation on conventional hybrids drives and their control system is carried out in the article. The equation that allows evaluating effectiveness of regenerative braking for different variants of hybrid drive are given. Presenting different types of locomotive energy savings power systems, which are using regenerative braking energy any form of hybrid traction vehicles systems, circuit diagrams, electrical parameters curves.
7
Content available Determination of conditions for search of optimal parameters of railway chassis suspensions
Lingaitis L., Dailydka S., Mjamlin S., Prichodko V.
Transport Problems
|
2008
|
T. 3, z. 1
77-84
EN
The efficiency of resilient suspension is usually expressed through various combinations of resilient and viscous elements, defined by dynamic and viscosity coefficients and other parameters. The aim of this article is to identify the components of the objective function, establish their weighted values and parameter regimes, and to determine fluctuation limits, initial values, and speeds of optimization parameters, which cannot be established a priori in advance. Calculations aimed at optimization of parameters show that the stability coefficient should be considered the main indicator of the objective function, as this is the first parameter to limit the running speed. Given the increasing speeds of trains, the presented method is very important in calculating suspensions.
8
The motorailer movement on uneven railway
Lingaitis L., Bogdevicius M.
Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
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2000
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nr 13
229-234
PL
W artykule rozważano ruch wagonu motorowego na nierównych torach Republiki Litewskiej. Przedstawiono przestrzenny model dynamiczny wagonu motorowego. Model ten składa się z elementów dyskretnych o nieliniowych charakterystykach. Dynamiczne obciążenia łożysk uzyskano w funkcji rozstawu szyn oraz prędkości jazdy wagonu motorowego.
EN
In the article the motion of the motorailer on uneven railways path of the Lithuanian Republic is considered. The three dimensional dynamie model of the motorailer is shown. The dynamic model is composed of discrete elements part of which have nonlinear characteristics. The dynamic loads of bearings are obtained depending on the gap between rails and the running speed of the motorailer.
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