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1

Research of impact of the loading on endurance of the freight locomotive engines

Lebedevas S., Lebedeva G., Dailydka S., Vaičiūnas G.

Transport Problems

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2015

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T. 10, z. 4

45--55

EN

The publication reflects the research results of the rationalization of the rolling stock use of JSC LG Lithuanian railways to increase the reliability indicators of the freight diesel locomotive exploitation reliability. The comparative evaluation of the exploited freight diesel locomotive work duration, according to the technical documentation, by using comparative test results and indirect diesel reliability criteria approved in practice. An algorithm of work duration forecasting methodology has been created, as well as a programme complex of mathematic modelling. The differences of the results indicated in the experiment and modelled by computer do not exceed 5÷7%. The proposed and described methodology of the diesel locomotive exploitation load cycle dynamic indicator reduction, by the use of which the following is achieved: increase of the diesel work duration by 7÷10%, reduction of fuel consumption up to 10%, reduction of the load cycle dynamic indicators (increasing the fatigue stress of parts and units of the diesel) by 15÷20%.

RU

Статья отражает результаты исследований, связанных с рационализацией подвижного состава ОАО Литовские железные дороги для улучшения показателей надежности эксплуатации грузовых тепловозов. Сравнительная оценка длительности эксплуатационной работы грузового тепловоза в соответствии с технической документацией базируется на результатах сравнительных испытаний и косвенных критериев надежности дизелей, полученных в практике. Был предложен алгоритм прогнозирования продолжительности эксплуатационной работы, а также программный комплекс для математического моделирования. Различие результатов, полученных экспериментально и моделируемых с помощью компьютера, не превышает 5 ÷ 7%. Предложены и описаны методология снижения динамического индикатора эксплуатационного цикла нагрузки тепловоза, с помощью которого достигается следующее: увеличение продолжительности работы дизеля на 7 ÷ 10%, снижение расхода топлива до 10%, снижение динамических показателей цикла нагрузки (снижение усталостных напряжений деталей и узлов дизеля) 15 ÷ 20%.

2

Investigation on features and tendencies of axle-box heating

Lunys O., Dailydka S., Bureika G.

Transport Problems

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2015

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T. 10, z. 1

105--114

EN

Breakdown of rolling stock axle-boxes if not detected in due time may cause a rail accident or disaster. At present, a lot of advanced technologies, modern equipment and devices, which “recognizes” faulty axle-boxes when the train is in motion, have been implemented. However, the timely identification of breakdown of rolling stock axle-boxes still is an acute problem, the initial stage of damage emergence being especially problematic. Presently, rolling stock axle-box breakdown is determined according to the higher than permissible temperature of the axle-box body. The article provides statistical data of dangerously heated axle-boxes, determined train delay durations, the number of delayed trains by danger level, and dependence of damage on the season. After systematization of data on axle-box damage and heating temperatures of broken axle-boxes, heating tendencies of axle-boxes of freight wagons are described. Finally, basic conclusions are given.

RU

Своевременно не обнаруженная неисправность буксы может привести к аварии поезда или катастрофе. В настоящее время внедрено много передовых (прогрессивных) технологий, современного оборудования и приспособлений, которые «распознают» неисправную буксу во время движения поезда. Но, несмотря на это своевременное, обнаружение неисправности буксы остается острой проблемой, особенно в начальной стадии повреждения. В настоящее время повреждения букс подвижного состава определяются по температуре нагревания корпуса буксы. В статье предоставлены статистические данные о буксах, нагревающихся до опасного предела, установлена продолжительность задержек поездов, количество задержанных поездов по уровням (категориям) опасности и зависимость нагрева букс от времени года. Тенденции нагрева букс грузовых вагонов описаны на основе систематизации данных о неисправностях букс и температуры их нагрева. В конце предоставлены выводы.

3

Research of the rational operational load of diesel locomotives

Lebedevas S., Dailydka S., Jastremskas V., Vaičiūnas G.

Eksploatacja i Niezawodność

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2014

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Vol. 16, no. 4

545--553

EN

In the research authors sugested calculations of a mathematical computer modeling methods, of the operational reliability indicators for the freight diesel locomotives M62K, 2M62M, ER20CF, when transporting cargoes via the main lines of the Lithuanian railway network. According to the permissible values of the diesel locomotive reliability criteria, the maximum weights of a train for the studied transportation lines have been calculated and a diesel engine resource has been predicted. A methodology for reducing the dynamic indicators of the operational load cycle of a locomotive diesel has been proposed and described. When applying it, a 15÷20% reduction of load cycle’s dynamic indicators (which increase the fatigue stresses of the locomotive’s cylinderpiston group parts and components) is achieved. Technological recommendations are formulated, in order to increase the usage of the operational reliability indicators of diesel locomotives and their energy efficiency.

PL

W oparciu o obliczenia dotyczące opracowanego z zastosowaniem komputerowego modelowania matematycznego układu w artykule przedstawiono badania porównawcze wskaźników niezawodności eksploatacyjnej silników dieslowych spalinowych lokomotyw towarowych M62K, 2M62M, ER20CF podczas kolejowych przewozów towarowych, dokonywanych głównymi liniami litewskiej sieci kolejowej. Stosując dopuszczalne wartości dla kryterium niezawodności silników dieslowych obliczono masę całkowitą pociągów na badanych liniach przewozowych oraz prognozowany resurs silników dieslowych. Zaproponowano i scharakteryzowano metodologię obniżenia wskaźników dynamicznych cyklu obciążenia eksploatacyjnego silnika dieslowego lokomotywy spalinowej. Dzięki jej zastosowaniu możliwe jest obniżenie o 15÷20% wskaźników dynamicznych cyklu obciążenia (zwiększających napięcia zasadniczych elementów jednostki cylindryczno-tłokowej i węzłów silnika). Sformułowano zalecenia technologiczne, mające na celu zwiększenie wskaźników niezawodności eksploatacyjnej silników dieslowych lokomotyw spalinowych oraz wykorzystanie ich skuteczności energetycznej.

4

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.

5

A study on the options of means for railway passenger transportation

Dailydka S., Lingaitis V.

Transport Problems

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2012

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T. 7, z. 1

53-62

EN

A mathematical model to select the best rolling stocks of trains is introduced. The parameters of income and cost of the passenger transportation by railways depending on the technical characteristic of used vehicles are thoroughly evaluated. The options how to reduce the cost calculated by a model in one of the specific routes of Lithuanian Railways are given and practical decisions are argumentatively given.

6

Passenger transportation problems of the public limited liability company "Lietuvos gelezinkeliai"

Dailydka S., Lingaitis L.

Transport Problems

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2009

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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.

7

Determination of conditions for search of optimal parameters of railway chassis suspensions

Lingaitis L., Dailydka S., Mjamlin S., Prichodko V.

Transport Problems

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2008

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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

Model matematyczny wahań przestrzennych wagonu pasażerskiego

Dailydka S., Lingaitis L. P., Myamlin S., Prichodko V.

Eksploatacja i Niezawodność

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2008

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nr 4

4-8

PL

Dla komfortu podróżnych i dla zapewnienia trwałości części i zespołów taboru kolejowego niezbędnym jest wybór racjonalnych parametrów zawieszenia podwozia, tj. ustalić racjonalne stosunki pomiędzy dwoma elementami sztywności stopni zawieszenia i tłumienia drgań. Niniejszy artykuł jest przeznaczony dla stworzenia przestrzennego modelu matematycznego, gdy istnieje zawieszenia z dwoma stopniami i różnymi elementami sztywności. Opracowany system równań posiada 52 stopnie swobody. Przedstawiony model matematyczny może byś stosowany dla ustalenia rzeczywistych obciążeń dynamicznych wagonów pasażerskich i przez to do wyboru racjonalnych parametrów krótkich zawieszeń.

EN

To ensure passenger comfort as well as the durability of the components of rolling stock, it is necessary to determine the rational parameters of chassis suspension, i.e. rational relations between rigidity and vibration inhibition elements of the two stages of chassis suspension. The article describes a spatial mathematical model of a two-stage suspension that has different rigidity elements. The equation system created has 52 degrees of freedom. The model presented in this article can be employed to establish the real dynamic load of passenger wagons and to determine the rational parameters of resilient suspension.