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1

Research of the defective frog wing OF 1/11 mark

Gavrilovs P., Ivanovs V.

Transport Problems

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2017

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T. 12, z. 4

119--126

EN

In this article, for the first time, research of the defective frog wing of the 1/11 mark on the Latvian Railway has been carried out. In the process of which was collected, processed and the analysis of points defects on the Latvian Railway was carried out for eight compartments of the track distance during 2014, 2015 and 2016 (Developed a chief of defectoscopy shop V. Glotov, approved CD the chief of the distance V. Makedon). The frog wing of the 1/11 mark (the 60 E1 DO 04 07 frog type) was considered according to the basic classification of the defects, and an analysis and research of the cause of its fracture were carried out.

2

Analysis of the restoration process of surfaces of railway turnout elements by build-up welding

Sergejevs D., Tipainis A., Gavrilovs P.

Autobusy : technika, eksploatacja, systemy transportowe

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2013

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R. 14, nr 3

269-271

EN

The practice has show that restoration of the surface of railway turnout elements by a build-up welding very often is unsuccessful due to subsequent origination of areas of premature destructions such as shivers, stratification, spalling, a.o. Experimental study revealed that causes of the defects are due to welding technology violations and ineffective turnout element existing defect diagnosis methods applied.

3

Intellectual logistic system for passenger railway transportations in town

Gavrilovs P., Ribickis L., Balckars P., Levchenkov A.

Logistyka

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2009

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nr 3

CD-CD

EN

For a passenger most comfortably, when a transport provides delivery "from a door to the door". On small distances this problem successfully decides through the use of motor transport. But growth of amount of cars resulted in supersaturating of motorways a transport and especially streets of cities. Corks appear, the rate of movement goes down as a result, muddiness of environment is increased. Development of network infrastructure of claotype transport is offered on the followings directions: - integration of claotype transport in the single system with other types of transport; - development of the system of city reports on a type a "streetcar - bus - trolleybus - train", which foresees the use of all of types of transport in a city environment. Use of conception a "streetcar - bus - trolleybus - train" is given by possibility to decide many problems of intercity transportations of the capital. Passing from the line of one system to the area other is accomplished in strictly certain clamp points on connecting ways; - improvement of terms of transplantation between the kinds of transport with the concordance of time-tables, by creation of the single stations - lining-out knots, will allow to reduce loading on knots and shorten moving of passengers, both at times and is, in "corks", in the clock of lances; For the decision of this task an algorithm which determines minimum time on the way between tops in simple with non-negative scales is examined. To such many types of counts are taken. If a count is not simple, he can be done such, casting aside all of loops and, replacing every great number of parallel ribs the shortest rib (by a rib with the least weight) from this great number; every undirected edge is replaced the pair of the directed edges. If a count is not self-weighted, it is possible to consider that all of ribs have one weight. The result of calculation are saved in the destination file of Short.out with the following structure: tops of way, time on the way.

4

Determination of amplitudes at oscillation of carriages on brake position of moderator-coolant?

Sergevevs D., Sergevevs A., Gavrilovs P.

Logistyka

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2009

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nr 6

EN

We present equations to describe in analytical form a dynamics of a freight carriages group on a sorting hill. The purpose is to determine analytically the amplitudes of oscillations, induced by a braking process on a moderatorcoolant. The groups of carriages needed to be braked may consist of four, six and ten carriages. The theoretically varied parameters are the longitudinal speed of the group and a period of brake apply, as well as types of the freight carriages. The results allow to choose the regime of safe braking in order to avoid the derailment.

5

Resisting momentum in the abutment to rotating of freight car bogie

Sergejevs D., Gavrilovs P.

Transport Problems

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2008

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T. 3, z. 4

65-71

EN

On the Latvian railway, derailments of freight cars take place in the course of shunting work on marshalling yards. A number of factors during shunting work on marshalling yards may contribute to the derailments of rolling stock: longitudinal dynamics during braking of cars with the turned off brakes by locomotive, hauling down cars from a marshalling hill with braking position controlled by an operator, dry internal rails in curves, absence of greasing in the pivot unit of freight bogies. At present, measures allowing elimination of the car derailments during shunting work are developed. During the period between repairs, the abutment unit of freight car often works in conditions of dry friction. Our observations suggest that at the time of taking a car into repair, there is often an absence of greasing between trail bearing and center plate of the abutment, and a presence of sandy dust. It increases a friction and, together with high contact pressures and dynamic influence, hinders the turn of bogie at motion of car. In this paper, the results of studying the resisting moment in the abutment to turning of bogie is reported. The study was conducted on the basis of freight bogie of type 18-100; the body was leant on the center plate unit of the abutment, on the center plate unit, and on the sliders. Experiments were conducted, with the use of greasing and at the dry friction of center plate unit.

6

Derailments of wagons during sorting on marshalling humps at the hump yards

Sergejeves D., Gavrilovs P.

Logistyka

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2008

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nr 2

CD-CD

EN

On the Latvian railway the last years there has been an increase of number of derailment of freight carriages. For the determination of reasons, resulting in the derailment of freight carriages, an analysis of derailments was carried for the last 10 years.