Категория: 2.9. Transport systems

Improving the estimation procedure of the residual operation life of a bypass turbojet

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UDK 629.5.03-843.8 BBK 74.5

Karavaev Y.A.

Hodackij S.A.

The article presents general approaches to forming an estimation procedure of the residual operation life of the bypass turbojets operated on civil aircraft for long periods of time by taking actual operating conditions into account. With the example of D-436-148 aircraft engine having the standard control program the authors analyze how the size of turbine-blade tip clearances influences the rate of exhaustion of a bypass turbojet module – the gas turbine. A fraction of moving blade damage on takeoff is proposed to be used as a parameter defining the rate of exhaustion of the gas turbine.

Key words: gas-turbine engine lifetime, turbine-blade tip clearances, durability of moving blades, creep.

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The issue of thermal renovation of infrastructure of railway transport is evaluated

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UDK 692:[232.4] BBK 38.5

S. S. Shaumarov

The physical impact of the external environment on the formation of the internal microclimate of premises is studied. The mathematical expression of the interaction process with the parameters of the fence outside and inside air is presented. A method for estimating the residual heat-shielding properties of the building envelope on the railways is offered.

Keywords: railroad facilities, air permeability, mathematical model, thermal upgrade.

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Concerning the efficiency of using the 3vl80s electric locomotives on the Kattakurgan – Navoi district of «Uzbekiston railways» jsc

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УДК 629.42:629.4.054, 625.28 ББК 39.232

O. S. Ablyalimov

The article presents the investigation results of evaluation of the efficiency of 3VL80s three-sectional main freight electric locomotives (trains) used on the Kattakurgan – Navoi district of Uzbek railways with stop-and-go freight traffic at passing tracks, intermediate stations and interstations. 

The author gives the freight trains traveltime parameters and basic energy indicators of 3VL80S transportation work as numerical values and graphs as well as the regression equations to find the indicator values taking account of  mass variation of freight trains.

The research results are recommended to the specialists of Uzbek railway line-enterprises for developing the complex activities related to the rise of traction and energy efficiency of 3VL80s three-sectional main freight electric locomotives (trains) in organizing freight traffic on the hilly-mountainous Kattakurgan – Navoi district of «Uzbekiston Railways» JSC.

Keywords: efficiency, result, freight train, movement, electric locomotive, district, method, exploitation, speed, calculation, rolling – stock, analysis, hilly-mountainous, point, dependence, substantiation, stage, railway.

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Study of the operation of the 3te10m diesel locomotives on the Kattakurgan – Navoi district of «Uzbekiston temir railways» jsc

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UDK 629.42:629.4.054, 625.28 BBK 39.235

O. S. Ablyalimov

The article presents the investigation results of analysis and evaluation of the efficiency of  3TE10M three-sectional main freight electric locomotives (trains) used on the Kattakurgan – Navoi district of Uzbek railways with non-stop freight traffic at intermediate stations, passing tracks and interstations. The basic indicators of transportation work of 3TE10M electric locomotives are shown as tabular dates and curves which were received using the methods of the locomotive-traction theory. The regression equations to find the numerical values of the indicators within the accepted range of mass variation of freight trains are identified.

The research results are recommended to exploitation department experts of the Bukhara locomotive depot for developing the practical activities directed to the rise of energy and fuel efficiency of using the 3TE10M three-sectional main freight electric locomotives (trains) in real conditions of organizing the rail transportation of goods different in composition, type and content on the hilly – mountainous Kattakurgan – Navoi district of «Uzbekiston railways» JSC.

Keywords: evaluation, result, freight train, movement, diesel locomotive, district, method, exploitation, condition, speed, calculation, rolling – stock, analysis, hilly – mountainous, point, dependence, substantiation, stage, railway.

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Evolution of account for human errors influence on collective work features and results

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UDK 629.735 BBK 39.5

N. I. Nikolajkin

V. D. Sharov

V. E. Andrusov

The authors analyze the information on the most widespread types of human errors which entailed emergences, accidents in various branches of economy and which led to various negative aviation events in civil aviation. Features of collective work in aviation were revealed and analyzed. It is shown how the problem of wrong actions influence on air-transport activity results is reflected in documents of the International Civil Aviation Organization (ICAO).

Evolution of account for influence of the “human factor” in various groups of air enterprise employees is considered. As the basic principles of flight crew’s collective work management were fulfilled reasonably well, it is expedient to extend these principles at land sites of collective work at air enterprises, down to aviation equipment maintenance crews.

On the basis of information about the incidents which happened to domestic commercial aircrafts from 2011 to 2016 (in which as the reasons the various violations occurred at maintenance were recognized), the examples illustrating “dirty dozen” of factors which predetermined workers’ errors were reviewed.

The article concludes that in organizing the maintenance processes in the modern domestic civil aviation it is important to develop a system of maintenance resources management including formation of skills and increase of staff quality levels. A pressing problem is the need to account for workers’ personal features and their health condition when forming the every shift of production teams as well as expediency of compensation of workers’ overstrain because of a regular employee’s disease. It is noted that the suggestion will allow increasing the branch safety level.

Keywords: aviation, collective work, management, human factor, emergency, accident, aviation incident.

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The research of screeners’ visual searching for prohibited items with the use of eye-tracking technology

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UDC 658.71.08; 519.87 BBK 39.5

A. K. Volkov

The research results of screeners’ visual searching for prohibited items and substances using Eye-tracking technology are presented. The results of applying the multivariate statistics methods to improve the reliability of the classification of students based on the analysis of their eyes activity are described. The criterion of competence formation in visual search is proposed. The possibility of applying Shewhart control charts to assess the statistical stability of visual searching was studied.

Keywords: screener, visual search of prohibited items, professional training, cluster analysis, Shewhart control charts.

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The helicopter cockpit training simulator of MI-8t based on the aircraft simulator

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UDC 378.162.33 BBK 39.5

V. M. Popov

S. V. Zdrachuk

The application of aircraft simulator X-plane for simulating flight dynamics and Arduino hardware environment for creating control system simulators, instrument and flight navigation equipment during the development of the cockpit of Mi-8T simulator is presented in the article.

Keywords: aircraft simulator, training aircraft simulator, Arduino hardware environment

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Transportation work effectiveness analysis of the 3te10m diesel locomotives on the Kattakurgan – Navoi road section of uzbek railway

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UDC 629.42:629.4.054, 625.28 BBK 39.232

O. S. Ablyalimov

The results of the substantiation of the parameters of the transportation work of three-section trunk (train) freight locomotives 3ТЭ10М on the real hilly-mountain section of the railway during the movement of freight trains without or with stoppings at intermediate stations, rail junctions and separate points, as well as assessing the haulage properties of the station – to – station track profile are presented. As a criterion for the aforementioned assessment, the given values of total and specific diesel fuel consumption for train haulage in quantitative and monetary calculations are proposed, taking into account the values of the train travel time in haulage mode and specific diesel fuel consumption per trip accompanying the transportation process. The results of research using the methods of the theory of locomotive haulage, taking into account the maximum values of the main indicators of the fuel and energy efficiency of using the 3TE10M diesel locomotives in the form of tabular data and characteristic curves were obtained. The results of the research are recommended for practical use by train drivers-instructors in heating engineering and specialists of linear enterprises of the locomotive complex of the Uzbek railway network, whose professional and production activities concern energy issues of freight and passenger trains on real hilly-mountain and, identical to them, virtual railroad section.

Keywords: assessment, result, freight train, movement, diesel locomotive, railway track, area, method, operation, condition, direction, stage, speed, calculation, railway equipment, analyses, hilly – mountainous, point, divide, average, dependence, substantiation, quality, stage, profile, railway.

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Influence of GTE rotor vibrations on technical condition of inter-shaft bearing

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UDC 004. 588 BBK 74.5

Yu. A. Karavaev

S. A. Khodatskiy

A significant number of aircraft engines taking out early from operation are associated with inter-shaft bearing failures. Possible causes of such failures are violations of their lubrication and cooling conditions. The article presents the results of experimental studies to assess the effect of reducing the performance of the oil tube with bending vibrations of the rotor on the thermal state of the inter-shaft bearing.

During the turbofan engine operation, its shaft co-performs bending vibrations due to the imbalance of the rotor. In this case, the oil tube, placed inside the engine shaft, will also make bending vibrations, which can be one of the reasons for reducing oil consumption through the oil tube with a significant level of vibrations. In this case, the working temperature of the inter-shaft bearing may increase significantly.

Keywords: aircraft engine, inter-shaft bearing, vibration velocity, bearing temperature, GTE oil system parameters.

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Comparative analysis of a mathematical model of the turbine gas temperature sensor of the turbocharger of a helicopter gas-turbine engine based on regres-sion analysis and neural networks

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UDK 629.7:681.324 BBK 39.551-01-07 S21

A. A. San’ko

A. A. Shejnikov

The article presents the results of a comparative analysis of mathematical models of the turbine gas temperature sensor of the turbocharger of a helicopter gas turbine engine based on regression analysis and on a multilayer neural network. The inexpediency of using a multilayer neural network as a mathematical model of a gas temperature sensor is proved. The optimal type of the mathematical model of the gas temperature sensor is selected by the criterion of the minimum error of the output parameter calculation.

Keywords: gas turbine engine, rotor, mathematical model of gas temperature sensor, helicopter, neural network.

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