Power Flows in a Hydrostatic-Mechanical Transmission of a Mining Locomotive During the Braking Process

Purpose. To improve the method for calculating the time standard for shunting cars from track to track in order to take into account the local operating conditions of railway stations and railway sidings. Methodology. During the research, the methods of theory of railway operation were used. The problem of calculating the time standard for shunting operation was solved as the problem of searching the optimal division of train set into the car groups to achieve minimal time consumption for shunting operation. Findings. In the course of the study, the methods for calculating the time standards for initial and final operations, as well as movements performed when shunting cars from track to track were improved. It was proved that the minimum time spent on shunting cars from track to track was achieved when the train set was divided into the minimum possible number of parts and the cars were shunted in the longest possible groups and one remaining group. It was also established that with sufficient accuracy for engineering problems the duration of shunting train set from track to track can be represented by the piecewise linear function of the car number in it. Originality. The work originality consists in improving the method for calculating the time standard for shunting cars from track to track, that, unlike the existing one, takes into account the length limitations of the car groups being shunted from track to track, as well as the actual composition of operations performed in the process of shunting. Practical value. The use of the developed method allows setting time standards for shunting cars from track to track, taking into account the local operating conditions of railway stations and sidings of industrial enterprises. The method also makes it possible to simplify solving problems of searching the optimal order of performing more complex shunting operations, such as sorting cars into several tracks, collecting cars on one track, train formation, and others.

Section: Information Technologies Systems Analysis and Administrationmentioning

confidence: 99%

Improvement of the method for standardizing the duration of rail cars shunting

Козаченко¹,

Gera²,

Manafov³

et al. 2021

“…The obtained results can be used in the modernization of other lubrication points for vehicles [15,16] as well as in neighboring branches of industry [17,18] and in manufacture of such systems [19,20].…”

Section: Introductionmentioning

confidence: 96%

Lubricants for rail transport liquid (plastic) for friction pair “wheel – rail”

Belikov¹,

Kreknin²,

Matsuk³

et al. 2022

Purpose. To formulate the requirements for the basic properties of lubricants suitable for use in the systems of on-board lubricators of rail vehicles. To develop a generalized algorithm for controlling the devices of the lubrication system of rail vehicles and to propose a method for controlling the lubrication system of the wheel flanges of a rail vehicle, which makes it possible to turn on the system in advance in order to prevent an increase in the interaction forces of the wheel flanges and rails during the entry to the curved section of the rail track, as well as on the turnouts. Methodology. Research methods include statistical analysis of the results of experimental tests of the properties of existing and proposed lubricants on the STs-2 friction machine and in the conditions of real operation of the rolling stock of JSCUkrzaliznytsia. Findings. Based on the results of operational tests, it was found that Relsol-M lubricant, which is regenerated, homogenized and modified with solid lubricating impurities, even with an expired shelf life, retains and demonstrates the transfer effect on all wheels of the VL11m/6 locomotive, and also slows down the wear rate of the combs of the wheel rims which were not chiseled during the tests by 3.57 times and the combs of the bandages which were chiseled during the tests by 4.25 times. Mariol NT demonstrated the effect of reducing the intensity of wear processes of the ridges of locomotive tires in the mode of freight traffic in relatively light track conditions by 2.5 times, and in more difficult road conditions by 5 times. Originality. Requirements for the basic properties of lubricants, which are suitable for use in on-board lubricator systems of rail vehicles, have been formulated. Practical value. A generalized algorithm for controlling the lubrication system of railway rolling stock is developed and a method for controlling the lubrication system of the flanges of the rail rolling stock is proposed, which makes it possible to turn on the lubrication system in advance when a rail vehicle enters a curved section of the track, as well as a turnout.

“…Mining and oil-extracting industries are among the most energy-intensive types of production [3,4]. The main consumers of energy in these industries are injection installations for the movement of liquid and gaseous media.…”

Section: Introductionmentioning

confidence: 99%

Ways to reduce hydraulic losses in multistage centrifugal pumping equipment for mining and oil-producing industries

Akanova¹,

Sładkowski²,

Podbolotov³

et al. 2021

Purpose. To study hydraulic losses in pumping units during pumping and transportation of liquids, to develop the design and technology solutions to improve the energy efficiency of centrifugal pumps in the mining and oil-producing industries. Methodology. In the theoretical and experimental analysis of hydraulic losses during the transportation of liquids, the hydraulics and experimental analysis methods were used. Findings. As a result of the research carried out, a new design scheme of a multistage centrifugal pump has been developed, providing a coaxial arrangement of impellers, which allows reducing hydraulic losses in pump elements and increasing the energy efficiency of pumping units. Originality. Based on the analysis of existing designs of multistage blowers of axial and centrifugal types, the distribution of hydraulic losses in the elements of a centrifugal blower with coaxial impellers is considered. Experimental dependences on the establishment of pressure flow and power characteristics are presented. Based on the accounting of hydraulic losses, the energy efficiency of the design of the pumping unit with the coaxial arrangement of the impellers was assessed. Practical value. The new design of a centrifugal pump with coaxial impellers reduces hydraulic losses by more than 23% compared to traditional designs of centrifugal pumps. The results of the work can be used by design, research, and industrial organizations engaged in the design and operation of pumping equipment.