BRAKING EFFICIENCY OF QUARRY TRAINS WITH SIX-BOGIES DUMP CARS OF THE INCREASED AXIAL LOAD UP TO 27.7 TF

Improving the technical level of railway transport of industrial enterprises is expressed in the introduction of advanced types of traction (locomotives and electric locomotives), four and six-axle specialized cars, including self-unloading, automation and telemechanics. To increase the productivity of quarry trains at PJSC "Kryukiv Railway Car Building Plant" a six-axle dump car model 33-7141 for quarry railway transport was designed. The car is designed for transportation from quarries of open cut hard rocks, ore and other bulk and lump cargo with density (1.75-4.0) t/m3, as well as mechanized unloading on dumping sites or crushing units of opencast mining. A distinctive feature of innovative dump cars from typical ones is the increase of cargo weight by 10 t and axial load to 271.6 (27.7) kN (ts). In this regard, the issues of assessing the braking efficiency of a quarry train with innovative dump cars that meet the requirements for railway industrial transport are becoming relevant. The article presents the study results of the braking efficiency of a quarry train composition of 10 and 14 cars. Locomotive TEM7 and unit OPE1AM with one and two motor cars were considered as traction units. The maximum permissible speeds were determined in a given range of slopes of the railway track, and the maximum possible descent was set provided that the braking distance does not exceed or will be equal to 300. As a result of research, it was found that the maximum allowable deviations ranged from 34 ‰ to 38 ‰ depending on the number of cars and traction units. The speed of trains with innovative dump trucks on the site is 42 km/h. Key words: dump car, tipping wagon, maximum slope, permissible speed, braking distance, traction unit.

METHOD OF EVALUATION OF RECEIVABLY BRAKING EFFICIENCY FOR ELEMENTARY SIMPLIFIED MOVEMENT CYCLE

The article analyzes the elementary simplified cycle of a vehicle with an electric motor during its acceleration and regenerative braking, the dependence of specific energy consumption on vehicle speed and the equation of specific energy consumption, to develop a mathematical model that characterizes the energy efficiency of a vehicle with traction traffic conditions on an elementary simplified cycle. The object of the study is the process of determining the specific energy consumption during the movement of a vehicle with an electric traction unit. The aim of the article is to develop a mathematical model that characterizes the energy efficiency of wheeled and rail vehicles with electric traction. Research methods - information-analytical. According to the results of the study, a method for evaluating the effectiveness of regenerative braking for an elementary simplified motion cycle is obtained. KEY WORDS: ELECTRIC TRACTION INSTALLATION, ENERGY EFFICIENCY, ENERGY CONSUMPTION, RECOVERATIVE INHIBITION, ELECTRODYNAMIC HALAMENE GALAMATE, MATHEMATICAL MODEL

Laboratory Calibration of Energy Measurement Systems (EMS) under AC Distorted Waveforms

Current standard EN 50463-2 indicates the tests and the requirements to be satisfied for an energy measurement system of a traction unit for railway applications. Some of these tests are to be done with several harmonics superposed on the rated voltage, respectively current. However, no calibration systems satisfying the standard requirements were available few years ago. The work performed in the EURAMET project “MyRailS” leads to the development of fictive power sources and reference measurement systems described in this paper. Therefore, it is possible to generate distorted 25 kV-50 Hz voltages with harmonics up to 5 kHz and 90° phase-fired currents up to 500 A with harmonics up to 5 kHz. The generated power is measured by developed traceable reference systems with accuracy better than 0.5%.

Dynamic Analysis of Shearer Traction Unit Considering the Longitudinal Swing

Shearer traction failure occurs frequently, which seriously restricts the safe and efficient mining of coal. However, the influence of the shearer’s posture on traction has not been fully considered in the existing research. To improve traction reliability: the dynamic model of the traction unit is established considering longitudinal swing; the walking characteristics of the shearer and the dynamics of the traction unit are analyzed; and the influences of traction velocity, drum load cutting arm angle, and depression angle are discussed. The results show that the longitudinal swing is reciprocating and the positive swing is more serious. With the increase of the traction velocity, the walking stability of the shearer decreases while the contact force increases, especially the support slipper. The longitudinal swing increases with the increase of lateral load, but the supporting force of the support slipper decreases with the increase of cutting load. The forces of the walking wheel and the support slipper show an increasing trend with the increase of cutting arm angle. When the depression angle is 5–10°, the load distribution of the contact components of the traction unit is more balanced. The results provide a reference for the structure optimization of the shearer and the layout of coalface.

Dynamic model and analysis of the traction unit gear system in long wall coal shearer

The present work contributes to the analysis of dynamic behavior of long wall coal shearer traction unit through dynamic model of geared drives. In contrast to the majority of the models in the literature, complete machine dynamic model of coal shearer is introduced for obtaining dynamic gear loads for traction unit. A new stochastic coal cutting loads model is presented. Predicted vibration accelerations were compared with coal cutting experiments. It is demonstrated that the predictions match very well with experimental data. Forced vibrations of traction unit gear system are studied to investigate the influence of some of the key design parameters. Frequency coupling phenomenon and cutting rock interlayer process are also investigated in this paper.

Design of Force Meter for Traction Unit

Force gauge is an instrument used to measure the force on the traction unit. The purpose of this study is made a force gauge meter which used during traction operation. The main component of this force gauge meter is Atmega 328, HX711 module and Loadcell type S sensor. The mikrokontroller Atmega 328 is the main board. Loadcell type S used to detect the force of traction, and the module HX711 is used to amplify the output of the loadcell sensor. In this study, the measurements were performed in the hospital. The error of this design is 0.01% and 4.8% for minimum and maximum, respectively. The force gauge designed portable and comes with a battery indicator.

Digitalization of traction rolling stock repairs

The article considers the approach to the mastering of modern digital technologies in the locomotive complex with regard to the tasks of increasing the controllability and, as a result, the efficiency of technological processes of maintenance and repair of traction rolling stock. The organizational, technical and technological solutions implemented in the first digital depot, created on the basis of the locomotive depot Vikhorevka of the East Siberian Traction Directorate of JSC «Russian Railways» (service locomotive depot Bratskoe of OOO «LokoTeh-Servis») are presented. Joint application of the complex of implemented solutions ensures implementation of the new technology of organization of locomotives maintenance and repair, feasibility of reaching the targets for readiness of the traction rolling stock for operation. Achieving efficiency of the technology built within the framework of the Digital Depot project is ensured by the universality of the repair position - all technological operations on locomotives maintenance and repair are performed at the digital universal repair position, including supercycle unscheduled works, are carried out in a single place without additional maneuvering. The universality of repair positions together with application of radio-controlled self-propelled traction unit with hybrid power plant increases the depot energy efficiency, reduces the expenses for maintenance of shunting locomotives stock and their total number, as well as allows to increase rhythmicity of locomotive repair. Implementation of transparent comprehensive information exchange between the process equipment of repair position, the systems for collecting, processing, analyzing data and information obtained in real time from on-board locomotive systems, monitoring and diagnostics systems applied during locomotive acceptance for repair, input and operation control, as well as at the stage of output control, provides the efficiency of control actions, objectivity of personnel performance discipline control and compliance with technical processes, increases the practical value of diagnostic data, which form the basis of qualitative repair and reliability of locomotives in operation.