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Articles 2281 - 2310 of 5920

Full-Text Articles in Engineering

Investigated The Strength Of Rolling Stock As A Fuzzy Function, M.L. Waail, R.V. Rahimov Nov 2019

Investigated The Strength Of Rolling Stock As A Fuzzy Function, M.L. Waail, R.V. Rahimov

Journal of Tashkent Institute of Railway Engineers

In this paper we use Fuzzy Set Theory to solve one of the essential problems in Railway Engineering: estimate the strength of rolling stock. As known, the strength of, any, rolling stock depends upon several factors that cannot determine them accurately. Therefore, we can consider them as fuzzy factors. The strength of any rolling stock can be changed depending on its operating conditions and the intensive of operation, that can consider as fuzzy factors too. A new proposal method developed depending on Fuzzy Set Theory to estimate the strength of mobile equipment or to compare between several rolling stocks for …

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Mathematical Models Of Differential Magnetic Circuits Of Converters With Movable Screens And Distributed Parameters, S.F. Amirov, O.T. Boltayev Nov 2019

Mathematical Models Of Differential Magnetic Circuits Of Converters With Movable Screens And Distributed Parameters, S.F. Amirov, O.T. Boltayev

Journal of Tashkent Institute of Railway Engineers

In the article the mathematical models of differential magnetic transducers with movable electromagnetic screens and with distributed parameters, taking into account the magnetic flux scattering, are developed. To develop a mathematical model of the transducer, the distribution expression of magnetic fluxes before the moving and after the moving parts are obtained using the method of magnetic circuit dismemberment, and the resulting magnetic flux is determined by the overlay method. The developed mathematical models showed that the discrepancy between experimental and theoretical results does not exceed 8-11%.

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The Model Of Network Bandwidth When Servicing Multi-Service Traffic, О.А. Turdiyev, А.B. Tukhtakhodjaev, E.S. Abdullaev Nov 2019

The Model Of Network Bandwidth When Servicing Multi-Service Traffic, О.А. Turdiyev, А.B. Tukhtakhodjaev, E.S. Abdullaev

Journal of Tashkent Institute of Railway Engineers

An important issue of ensuring the quality of service on multiservice networks is the correct calculation of their capacity. The proposed numerical methods for assessing the quality characteristics in various disciplines of service applications are time-consuming and do not allow you to quickly manage the resources of the network. In this paper, it is proposed to choose the right from an economic point of view, the optimal resource multiservice network

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Calculation Of The Frame Of Locomotives Tem2 In Operation, M.Sh. Valiyev, E.H. Astanov Nov 2019

Calculation Of The Frame Of Locomotives Tem2 In Operation, M.Sh. Valiyev, E.H. Astanov

Journal of Tashkent Institute of Railway Engineers

The article considers the frame of TEM-2 locomotives taking into account the stresses arising in the operation processes. The calculation of the frame of the locomotive TEM2 makes it possible to assess the tensile-deformed state of the frame and to give a comparative assessment of the structural strength, reliability and long service life before and after their useful use

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Improving The Operation Of The Automatic Temperature Control System For Water And Oil Of Diesel Systems Of A Diesel Locomotive 2te10m, D.N. Kurilkin, A.V. Osipov, K.U. Muminov Nov 2019

Improving The Operation Of The Automatic Temperature Control System For Water And Oil Of Diesel Systems Of A Diesel Locomotive 2te10m, D.N. Kurilkin, A.V. Osipov, K.U. Muminov

Journal of Tashkent Institute of Railway Engineers

Maintaining optimal water and oil temperatures for diesel systems of a diesel engine 2TE10M is carried out by a system of automatic temperature control. How efficiently this regulation system works will determine the quality of the diesel generator set. Evaluation of the effectiveness of the automatic temperature control system was carried out on the basis of the use of diesel power allocated to the cooling chamber fan drive. The fan drive of the refrigeration chamber of the 2TE10M diesel locomotive includes a hydromechanical gearbox with a fluid coupling of variable filling, for which development of a mathematical model, refinement of …

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To Analysis Of The Stressed Condition And Long Durability Of Cylindrical And Conic Pipes Of Polymeric Materials, A. Abdusattarov, F.E. Abduqodirov, D.N. Shamsiyev Nov 2019

To Analysis Of The Stressed Condition And Long Durability Of Cylindrical And Conic Pipes Of Polymeric Materials, A. Abdusattarov, F.E. Abduqodirov, D.N. Shamsiyev

Journal of Tashkent Institute of Railway Engineers

The article considers the solution of the problem of long-term strength and damage of a conical pipe and a hollow cylinder bonded to a thin-walled shell under the action of internal pressure, taking into account the influence of visco-elastic properties of the material on the stress-strain state

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Choice Of Basic Parameters, Calculation And Design Of Pulse Magnetizing Devices, J.F. Kurbanov Nov 2019

Choice Of Basic Parameters, Calculation And Design Of Pulse Magnetizing Devices, J.F. Kurbanov

Journal of Tashkent Institute of Railway Engineers

The purpose of this work is to develop methods and devices degaussing rail lashes. Magnetization in railway transport plays an important role for the safety of train traffic. Therefore, it is necessary to develop methods and devices for the demagnetization of products in railway automation and remote control, which is an urgent task. The residual magnetization leads to swelling of the welded joints of the rails, which leads to the formation of cracks, which can lead to train accidents during their movement. During the operation of the railways, magnetization also occurs due to the rotation of the wheel sets and …

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Development Of Railway Automation And Telemechanics Systems In Modern Conditions, N.M. Aripov, D.X. Rixsiyev Nov 2019

Development Of Railway Automation And Telemechanics Systems In Modern Conditions, N.M. Aripov, D.X. Rixsiyev

Journal of Tashkent Institute of Railway Engineers

The article deals with the development of railway automation and telemechanics systems in modern conditions by upgrading existing track receivers of rail circuits. We recommend a microcontroller-based track receiver for station rail circuits. The developed electrical device-an electronic pulse-phase track receiver based on a microcontroller - will serve to improve the existing relay track receivers, increase the reliability and service life of the elements of the rail chain, minimize preventive maintenance, and reduce the cost of equipment. The proposed solution significantly reduces the risk of dangerous failures of station rail circuits, and also increases the safety of train traffic

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Modeling Of Algorithms For Searching For Failures In Rail Circuits Of Railway Automation And Telemechanics Using Hierarchical Colored Petri Time Networks, P.E. Bulavskiy, O.K. Vaisov Nov 2019

Modeling Of Algorithms For Searching For Failures In Rail Circuits Of Railway Automation And Telemechanics Using Hierarchical Colored Petri Time Networks, P.E. Bulavskiy, O.K. Vaisov

Journal of Tashkent Institute of Railway Engineers

Studies have been carried out to estimate the recovery time of the operation of rail circuits of alternating current of 25 Hz, taking into account the formalization of technological processes for searching and eliminating failures based on the apparatus of hierarchical color temporary Petri nets. The developed simulation model is constructed by analyzing the state of technical means, statistical, regulatory documentation and observing technical specifications and regulations, local conditions and the location of signal points on the stage. The methods of the theory of Petri nets are used, which are based on the discrete-event paradigm of simulation modeling and the …

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Labor Conditions Of Locomotive Staff Of Jsc "Uzbekiston Temir Yullari", O.T. Aliev Nov 2019

Labor Conditions Of Locomotive Staff Of Jsc "Uzbekiston Temir Yullari", O.T. Aliev

Journal of Tashkent Institute of Railway Engineers

The paper analyzes the results of certification of jobs for locomotive crew workers at the electric locomotive depot TCH-1, which is part of the structure of JSC “Uzbekistan Temir Yollari”. The working conditions of locomotive drivers and their assistants are determined with the influence of external and internal production factors on them. Trends in the occurrence of occupational diseases, such as sensorineural hearing loss and vibration disease in locomotive crew workers, were identified. Specific proposals for identified deficiencies are identified. According to the results of studies, it was determined that in such circumstances it is possible to provoke durable multifunctional …

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Express Delivery By Rail Using Speed And High-Speed Trains, Sh.Sh. Kayumov Nov 2019

Express Delivery By Rail Using Speed And High-Speed Trains, Sh.Sh. Kayumov

Journal of Tashkent Institute of Railway Engineers

Currently, fast delivery of documents, money and small parcels are in great demand in the country. Due to the slow speed of delivery and quality of service, fewer and fewer people trust the state mail. In the article, the author suggests using speed and high-speed trains for these purposes, which will enable users of Express Mail to save time and money

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Development Of Economic And Mathematical Model Of Calculation Of Expenses At Processing Of Cars At Sorting Station, D.B. Butunov Nov 2019

Development Of Economic And Mathematical Model Of Calculation Of Expenses At Processing Of Cars At Sorting Station, D.B. Butunov

Journal of Tashkent Institute of Railway Engineers

In this article the model is developed for calculation of the expenses connected with processing of cars on marshalling yard. Methods of economic-mathematical modeling are applied. It is formulated technique for definition of expenses when processing cars on marshalling yard. Expenses, the cars connected with processing on the example of classification yard service of "Ch" JSC UTY are calculated. Dynamics and structure of expenses by types of works on processing of cars at the station "Ch" is considered

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Prospective Development Of The Railway Station Akhangaran-Tukimachi-Sirdarya, D.I. Ilesaliev, S.B. Sattorov Nov 2019

Prospective Development Of The Railway Station Akhangaran-Tukimachi-Sirdarya, D.I. Ilesaliev, S.B. Sattorov

Journal of Tashkent Institute of Railway Engineers

The planned China-Kyrgyzstan-Uzbekistan railway line is designed to connect East Asia with the Middle East and Southern Europe. However, aging of fixed assets of railways significantly reduces reliability and their throughput in the conditions of a continuously growing volume of freight traffic. This problem is associated not only with the development of new or improvement of existing technical solutions, but also with technological solutions related to planning, organizing and managing traffic flows in the future. After the launch of the China-Kyrgyzstan-Uzbekistan railway line, the Tukimachi station will become a major railway junction at the crossroads of North-South and East-West transport …

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Issues Of Regulation Of Train Locomotives Of The Railway Section Chukursay-Saryagash, M.N. Masharipov, Sh.M. Suyunbaev, M.M. Rasulmukhamedov Nov 2019

Issues Of Regulation Of Train Locomotives Of The Railway Section Chukursay-Saryagash, M.N. Masharipov, Sh.M. Suyunbaev, M.M. Rasulmukhamedov

Journal of Tashkent Institute of Railway Engineers

The successive arrival of freight trains to the station performing border control of trains leads to a glut of adjacent sections by trains, mainly due to the employment of border guard brigades. Without the use of operational solutions in such conditions, the reserve of bandwidth is reduced and the need for locomotives is increased due to hot downtimes when the train station is not accepted for border control. This article has developed a methodology for regulating train locomotives, which allows to increase the useful work of train locomotives. The developed methodology will assist engineers and technicians in the connection of …

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The Method Of Calculating The Middle Simple Locomotive And The Train Composition In The Turnover Point Based On The Modeling In The Conditions Of A Pair Traffic Of Trains, M.N. Masharipov Nov 2019

The Method Of Calculating The Middle Simple Locomotive And The Train Composition In The Turnover Point Based On The Modeling In The Conditions Of A Pair Traffic Of Trains, M.N. Masharipov

Journal of Tashkent Institute of Railway Engineers

The article developed a method for calculating the average downtime of a locomotive and the composition of a train at a turnaround point based on modeling in a pair train schedule. As a result of this, it is scientifically substantiated that strict adherence to the principle “trains do not expect a locomotive” will lead to a significant increase in the cost of locomotive hours at the point of turnover

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Method Of Upgrading A Cargo Transport Units, Avaz Mirsultanovich Merganov Nov 2019

Method Of Upgrading A Cargo Transport Units, Avaz Mirsultanovich Merganov

Journal of Tashkent Institute of Railway Engineers

The costs associated with handling and transport- warehousing operations reaching about half of the total costs of the transportation process. In this regard, it is necessary to study the issues of consolidation of cargo units, as this will increase productivity and minimize logistics costs. This article describes the search algorithm for the consolidation of cargo units. The study also provides mathematical models of the relationship between the parameters of a piece load, container and a standard pallet. The practical significance is to increase the utilization rate of the standard pallet, besides the proposed method will allow you to choose the …

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Mathematical Model Of Determining The Optimal Period Of Technical Maintenance Of The Special Self-Propelled Rolling Stock, Z.G. Mukhamedova Nov 2019

Mathematical Model Of Determining The Optimal Period Of Technical Maintenance Of The Special Self-Propelled Rolling Stock, Z.G. Mukhamedova

Journal of Tashkent Institute of Railway Engineers

The article covers the mathematical model for determining the optimum periodicity of maintenance, separately for mechanical, electrical and hydraulic equipment for emergency recovery vehicles

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A Study Of The Implementation Of Standards-Time Of Wagons At Sorting Station, D.B. Butunov Nov 2019

A Study Of The Implementation Of Standards-Time Of Wagons At Sorting Station, D.B. Butunov

Journal of Tashkent Institute of Railway Engineers

The implementation of the established norms of the time spent by cars at the sorting station is investigated. The methods of statistical data processing and comparison of the time spent at the station with the established scheduled tasks were used. The structure of the time spent by transit cars with processing at the sorting station is analyzed. An element-by-element analysis of the time of transit cars with processing is carried out. The average daily savings and unproductive loss of time on the elements are determined. The costs of processing cars at the station, falling on each element of the time …

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Geometric Formation Of Schemes Of Technical Objects In Automated Design Systems, M.A. Khadzhimuhametova Nov 2019

Geometric Formation Of Schemes Of Technical Objects In Automated Design Systems, M.A. Khadzhimuhametova

Journal of Tashkent Institute of Railway Engineers

This paper discusses the issues of mathematical support for the formation of various schemes of complex technical objects for a computer-aided design subsystem. Information is given on the description of the station diagram using finite element methods. On the one hand, it is required that the mathematical model be as universal as possible (cover all types of de-signed schemes), accurate, algorithmically reliable. On the other hand, it is required to ensure the minimum cost of the required memory of com-puter time. These contradictions are eliminated by creating a bank of models. Models are planned from separate modules of structural and …

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Development Of Production Technology Of Foreign Resource-Saving Induction Motors, S.N. Kayumov Nov 2019

Development Of Production Technology Of Foreign Resource-Saving Induction Motors, S.N. Kayumov

Journal of Tashkent Institute of Railway Engineers

In the paper of work on the topic "Of Ethnology construction and work of asynchronous engines", in the laboratory class, the control task, conclusions and annexes. In accordance with the curriculum in the discipline "Electric and basis electronics", the fundamentals of the theory of asynchronous squirrel-cage rotors are developed ethnologic. A training module is developed, and a method for performing laboratory work, innovations and foreign experience, in the same place, a brief description of the curriculum of the program, in the laboratory class, the control task, conclusions and annexes.

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Efficient Frequency Control System Of Asynchronous Motor, U.T. Berdiyev, A. Norboyev Nov 2019

Efficient Frequency Control System Of Asynchronous Motor, U.T. Berdiyev, A. Norboyev

Journal of Tashkent Institute of Railway Engineers

This paper discusses efficient frequency control systems that are widely used in the motion of production mechanisms of asynchronous motors with short-circuited rotor. From these systems, the functional circuit of the scalar frequency control system was analyzed

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Iron-Based Soft Magnetic Materials Used In Electrical Engineering, G.A. Govor, A.K. Vecher, U.T. Berdiyev, N.B. Pyrmatov Nov 2019

Iron-Based Soft Magnetic Materials Used In Electrical Engineering, G.A. Govor, A.K. Vecher, U.T. Berdiyev, N.B. Pyrmatov

Journal of Tashkent Institute of Railway Engineers

This article discusses the characteristics and ways of obtaining soft magnetic materials on iron bases for manufacturing separate parts of magnetic cores of electrical machines. Soft magnetic materials shall have high initial and maximum magnetic permeability and low coercive force, and they shall have little loss of eddy current remagnetization, have a small hysteresis loop area and have relatively high electrical resistance. The production of electrical machine parts by powder metallurgy, compared to the magnetic metal products currently used, offers great advantages, reduced weight and size of parts, wider frequency range of materials operation, smaller vortex and magnetic losses and …

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Plots Of Pojected Sorting Selection Hill’S The Uncertainty In The Formulas Of The Peak Constructive And Technological, Shuxrat Umarxodjayevich Saidivaliev Nov 2019

Plots Of Pojected Sorting Selection Hill’S The Uncertainty In The Formulas Of The Peak Constructive And Technological, Shuxrat Umarxodjayevich Saidivaliev

Journal of Tashkent Institute of Railway Engineers

In the article, on the basis of theorems on the change of kinetic energy for a non-free material point in the final form of theoretical mechanics, formulas for determining the braking path of the car in the braking zone of the sorting hill are derived. With a known value of the acceleration during the braking of the car the path of the car braking section can also be determined by the formula of the path of elementary physics. In the article on the basis of the theorem on the change of kinetic energy for a non-free material point in the …

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Preventive Monitoring Railway Reinforced Concrete Bridges, I.G. Ganiev Nov 2019

Preventive Monitoring Railway Reinforced Concrete Bridges, I.G. Ganiev

Journal of Tashkent Institute of Railway Engineers

One of the main tasks of the railway industry of Uzbekistan, directly related to the development of the national economy, is the radical improvement of the condition of railways and structures on them. Therefore, the aim of this work is to develop practical preventive monitoring to increase the efficiency of the operational process. To achieve this goal, methods of scientific analysis, probability theory and stock theory, the principles of interaction, as well as experimental-static methods of compiling models were used. Using the developed preventive monitoring, it can be correctly organized preventive monitoring to ensure the required operational reliability of existing …

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Critical Path For Project Development, Steven Douglas Kreis, Bryan Gibson, Jeff Jasper, Christopher W. Van Dyke, Candice Y. Wallace, Rachel Catchings, Sarah M. Mccormack Nov 2019

Critical Path For Project Development, Steven Douglas Kreis, Bryan Gibson, Jeff Jasper, Christopher W. Van Dyke, Candice Y. Wallace, Rachel Catchings, Sarah M. Mccormack

Kentucky Transportation Center Research Report

Overseeing the delivery of highway projects at the Kentucky Transportation Cabinet (KYTC) requires the successful coordination of activities and inputs from multiple external agencies and members of the agency’s Project Development team, who have varied disciplinary backgrounds. Despite the complexity of project delivery, the Cabinet presently does not estimate hours and project milestone dates until after it has selected a design consultant. Moving forward KYTC should explore requiring consultants to develop a critical path method (CPM) schedule. To facilitate this process, this report describes a methodology for producing CPMs for design contracts/projects based on procedures outlined in A Guide to …

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Participatory Sensing-Based Geospatial Localization Of Distant Objects For Disaster Preparedness In Urban Built Environments, Hongjo Kim, Youngjib Ham Nov 2019

Participatory Sensing-Based Geospatial Localization Of Distant Objects For Disaster Preparedness In Urban Built Environments, Hongjo Kim, Youngjib Ham

Civil and Environmental Engineering and Engineering Mechanics Faculty Publications

Although the benefit of participatory sensing for collecting local data over large areas has long been recognized, it has not been widely used for various applications such as disaster preparation due to a lack of geospatial localization capability with respect to a distant object. In such applications, objects of interest need to be ro- bustly localized and documented for supporting data-driven decision-making in site inspection and resource mobilization. However, participatory sensing is inappropriate to localize a distant object due to the absence of ranging sensors in citizens' mobile devices; thus, the localization accuracy varies to a large extent. To address …

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Moving From Walkability? Evaluation Traditional And Merging Data Sources For Evaluating Changes In Campus-Generated Greenhouse Gas Emissions, Troy Kawahara, Bo Liu, Anurag Pande, Calvin Thigpen, Carole Turley Voulgaris Nov 2019

Moving From Walkability? Evaluation Traditional And Merging Data Sources For Evaluating Changes In Campus-Generated Greenhouse Gas Emissions, Troy Kawahara, Bo Liu, Anurag Pande, Calvin Thigpen, Carole Turley Voulgaris

Mineta Transportation Institute

Universities are increasingly committing to reduce campus-generated greenhouse gas emissions, whether voluntarily or in response to a legal mandate. As an initial step to keeping these commitments, universities need an accounting of baseline greenhouse gas emissions levels and means of monitoring changes in campus-generated greenhouse gas emissions over time. Commute-generated greenhouse gas emissions from travel to and from campus by students and employees are among the most difficult to quantify. This report examines some of the challenges associated with estimating campus-generated greenhouse gas emissions and evaluates ways to address those challenges. The purpose of this study is to identify changes …

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Spatio-Temporal Analysis Of Highway Congestion And Accidents: A Case Study Of Interstate 285 In Georgia, Melodi Zhan-Moodie Oct 2019

Spatio-Temporal Analysis Of Highway Congestion And Accidents: A Case Study Of Interstate 285 In Georgia, Melodi Zhan-Moodie

Master of Science in Civil Engineering Theses

Road traffic crashes threaten thousands of drivers every day and significant efforts have been put forth to reduce the number of traffic crashes and their impact. Traffic congestion could be both a result of and a contributing factor to traffic crashes. The aim of this study is to investigate spatio-temporal traffic congestion and crash patterns to gain a better understanding of the causation of congestion and accidents, and their interaction. The Interstate 285 (I-285) in Georgia was used as a case study. With the aid of Geographic Information Systems (GIS), spatial clustering and densities of accidents were performed by following …

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Effect Of Light Activated Self-Healing Polymers On The Performance Of Asphalt Pavement Containing Recycled Asphalt Materials (Rap/Ras), Sharareh Shirzad Oct 2019

Effect Of Light Activated Self-Healing Polymers On The Performance Of Asphalt Pavement Containing Recycled Asphalt Materials (Rap/Ras), Sharareh Shirzad

LSU Doctoral Dissertations

A new generation of Ultraviolet (UV) light-induced self-healing polymers was introduced for the asphalt pavement application with the aim to enhance pavements durability while increasing its service life. The developed self-healing polymer was mixed with asphalt binder using two different methods, passive and reactive. For the passive method, the cured self-healing polymer was ground to smaller particle size and then it was mixed with asphalt binder using a high shear stirrer and at a high temperature. For the reactive method, self-healing polyurethane pre-polymer was added to the asphalt binder at a lower temperature and lower shear rate compare to the …

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Incorporating Travel Time Reliability In Predicting The Likelihood Of Severe Crashes On Arterial Highways Using Non-Parametric Random-Effect Regression, Emmanuel Kidando, Ren Moses, Eren Erman Ozguven, Thobias Sando Oct 2019

Incorporating Travel Time Reliability In Predicting The Likelihood Of Severe Crashes On Arterial Highways Using Non-Parametric Random-Effect Regression, Emmanuel Kidando, Ren Moses, Eren Erman Ozguven, Thobias Sando

Civil and Environmental Engineering Faculty Publications

© 2019 The Authors Travel time reliability (TTR) modeling has gain attention among researchers' due to its ability to represent road user satisfaction as well as providing a predictability of a trip travel time. Despite this significant effort, its impact on the severity of a crash is not well explored. This study analyzes the effect of TTR and other variables on the probability of the crash severity occurring on arterial roads. To address the unobserved heterogeneity problem, two random-effect regressions were applied; the Dirichlet random-effect (DRE) and the traditional random-effect (TRE) logistic regression. The difference between the two models is …

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