Wyniki wyszukiwania - Biblioteka Nauki

1

Research on selection of modes of driving heavy trains on main IXB and IXD corridors of JSC "Lietuvos gelezinkeliai"

100%

Lingaitis L. , Dailydka S. , Jevdomacha G.

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tom 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.

2

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

100%

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

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2015

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tom 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%.

3

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

100%

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

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tom 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.