Transportation Engineering Commons^™

Mathematical Modeling Of The Carriage Movement Along The Descending Part To Movement Of The Marshalling Hump, Kh.T Turanov, Sh.U. Saidivaliev, Sh.B. Djabbаrov, Kh.Kh. Djalilov

Journal of Tashkent Institute of Railway Engineers

In the article, based on the basic law of point dynamics with non-ideal connection of theoretical mechanics, the speed of the car movement on each section of the descending part of the marshalling hump. A generalized model of the speed of the car at the calculated point of the marshalling hump is obtained. This model made it possible to calculate the instantaneous values of the speed of the car from the top of the hill to the calculated point in a continuous mode. This made it possible to speed up the process of plotting changes in accelerations, speeds, and time …

On Design Features And Improvements Freight Wagon Braking Systems, U.Sh. Israilov

Journal of Tashkent Institute of Railway Engineers

The review of the basic schemes of brake lever transmissions used on freight wagons of Uzbekistan is presented. The advantages and disadvantages inherent to these schemes are shown. Methods of brake systems improvement are considered and the analysis of theoretical methods of their design evaluation is made.

Equipment For Transportation Of Wooden Materials: New Technological Solutions And The Use Of High Strong Steels, N.A. Tanicheva, I.O. Filippova, R.V. Rahimov, Ya.O. Ruzmetov

Journal of Tashkent Institute of Railway Engineers

There is a need to develop a new design of removable reusable means for the transportation of timber on universal wagon platforms, including using high-strength steel. The use of high-strength steel improves the technical and economic performance of platform wagons for the transportation of timber. The need to develop the regulatory and technical base for the introduction of new high-strength steels in the wagon industry has been identified.

Forecast Efficiency Of Application Of Electronic Documents In Cargo And Commercial Works On Railway Transport, N.M. Aripov, Sh.Sh. Kamaletdinov

Journal of Tashkent Institute of Railway Engineers

This article provides a predictive economic assessment of the introduction of electronic document management technology based on an electronic digital signature on the processes of freight and commercial work in rail transport. To determine the economic efficiency of the proposed technology, a technique was used that includes countable and uncountable effects. The constituent elements, the main economic indicators of the implementation of the automated system are detailed. Savings of money and time of railway transport and users of freight transportation services are determined.

Increasing The Train Safety Level Based On A Process Approach, A.Kh. Makhkamov, M.Sh. Valiev

Journal of Tashkent Institute of Railway Engineers

The article deals with improving the level of train traffic safety based on the process approach, provides a classification of failures of technical means and methods of their parry. The main attention is paid to the occurrence of cases of traffic safety violations. To increase the level of the DB support system, the entire process of organizing transportation is divided into four main blocks: management processes, resource support processes, production processes, interaction and control processes.

Modernization Of The Crate Suspension Unit Of The Vl-80s Electric Carrier, G.А. Khromova, D.O. Radjibaev, S.A. Khromov, I.C. Kamalov

Journal of Tashkent Institute of Railway Engineers

The article presents the development of a modernized design of a cradle suspension unit for an electric locomotive VL-80s with improved elastic-dissipative suspension properties with substantiation of dynamic and strength parameters. Numerical studies were carried out in the MathCAD 15 programming environment. For railway company is necessary to develop a new method of modernizing the cradle suspension of the VL-80s electric locomotive during overhaul repairs in order to improve the dynamic characteristics and increase the strength and reliability.

Research Of Development Prospects Of Transportation Hub In Jsc "Umc", Marufdjan Xalikovich Rasulov, Sh.M. Suyunbayev, M.N. Masharipov

Journal of Tashkent Institute of Railway Engineers

As you know, an increase in the volume of production of any object requires to reasonably provide for a comprehensive analysis of the compliance of its technical equipment and technology of work with the prospective traffic volumes. The article analyzes the existing and prospective volumes of work, shows the results of calculations, the available throughput capacity of the station. "B" - Art. "З" and the throughput of the receiving and departure tracks stations "Z", "P" and “S ", the required number of shunting locomotives has been determined, a number of measures have been proposed to improve the work of the …

Application Of Fiber-Optic Communication Line Under Control And Monitoring Of Track Relays In Station Rail Circuits, Q.K Nuriddinov, Z.I. Mamedova

Journal of Tashkent Institute of Railway Engineers

This article discusses the problems of using a fiber-optic transmission line under control and monitoring the voltage of track relays in station rail circuits. A functional diagram of the fast and central equipment of a fiber-optic transmission line and their interconnection are shown. Several different network modules for organizing data transfer are considered. Comparative analyzes are given, problems that arise during the operation of network modules and their solutions are described. As a result of the analysis, the optimal version of the network module was selected and recommendations for developing its software are given

Transfer Function Of A Traction Induction Motor Controlled By A Four-Quadrant Converter, As A Link Functional Diagnostics, M.C. Yakubov, Zh.S. Fayzullaev

Journal of Tashkent Institute of Railway Engineers

An expression for the transfer function of a traction asynchronous motor with a four-square converter is derived. It is shown that the basic properties of the traction motor, which are a four-square converter, correspond to the linearization coefficients. The values of linearization coefficients for a typical system in the entire region of equilibrium states.

Dynamic Characteristics Of The New Three-Phase Current Unbalance Transformer Converter, Sultan Fayzullayevich Amirov, S.X. Zhumaboyev, N.R. Yuldashev

Journal of Tashkent Institute of Railway Engineers

The article examines the dynamic characteristics of a new transformer Converter for three-phase current asymmetry. It is shown that when a three-phase current is applied to the input of the Converter, its transient characteristic consists of the sum of the established sinusoidal and free components, which decay at a speed that depends on the time constant of the magnetic circuit of the Converter.

Automatic Locomotive Signaling Parameters Devices On The Basis Of Microprocessor Elements, B.B Raxmonov, J.F. Kurbanov, J.E. Xidirov

Journal of Tashkent Institute of Railway Engineers

This article is devoted to an automatic locomotive signaling device associated with railway automation and telemechanics systems, ensuring the safety of train traffic. Wearable devices designed to test locomotive alarms are presented. Methods of measuring the magnetic field of the rails are described. A microprocessor-based digital decoder was developed for the special communication laboratory carriage. To improve the accuracy of the device, software and a wireless module were developed for storing the obtained measurement results and sending data online to the station's electromechanics. In the process, the following parameters are comprehensively determined: differential EMF, active resistance, quality factor and insulation …

Substantiation Of The Input Of The Parameters Of The Unprofitable Loss Of Time When Norming The Time Of The Duration Of The Wagons On The Sorting Station, D.B. Butunov

Journal of Tashkent Institute of Railway Engineers

Defining a new approach to accounting, analysis and reduction of unproductive losses in the operation of the sorting station. The methods of factor analysis are applied, the construction of a map of value creation flows. An expression is given for determining the values of unproductive losses in the operation of the station. The number of the causes of losses is determined, and they are grouped in order to solve the problem of overcoming the information gap in the analysis of the causes of losses. A flow map of the existing and proposed state of the carriage processing process at the …

Development Of Algorithms And Methods Of Automatic Mode Of Electric Centralization System For Installing Routes For High-Speed Trains, B.B. Raxmonov, S.T. Boltaev, J.F. Kurbanov

Journal of Tashkent Institute of Railway Engineers

At present, the CIS (Commonwealth of Independent States) has introduced an additional “high-speed traffic” regime in the electrical interlocking system to prepare routes for high-speed trains at stations. The use of a scheduled time notification restricts the movement of trains at stations and paralyzes all movements at stations and tracks before and after the passage of a high-speed train. To reduce this time, algorithms and methods were proposed for the automatic mode of the electrical interlocking system when establishing routes to stations, taking into account various categories of trains.

Determining The Correction Factor For A Current Transformer With Automatic Range Control, Sultan Fayzullayevich Amirov, Sh.S. Mukhsimov, O.T. Boltayev, S.Kh. Zhumaboyev

Journal of Tashkent Institute of Railway Engineers

The article deals with the introduction of a correction factor for protection and control devices, since the value of the secondary current in one range does not correspond to the value of the secondary current in the other range, which is determined depending on the difference of the counter-directional MDS created by the components of the inter-counter-directional primary current of the current transformer. Also, an algorithm was developed to account for the measurement error in the automatic system that controls the operation mode of the current transformer. In addition, it was determined that the output data should be transmitted taking …

Railway Transportation Of Tourists: Problems And Solutions, M.M. Talipov

Journal of Tashkent Institute of Railway Engineers

Uzbekistan is one of the top ten countries in the world in terms of the scale of tourism and the number of historical monuments. The cities of Samarkand, Bukhara, Khiva and Shakhrisabz are included in the list of UNESCO World Heritage Sites. The country has created the necessary conditions that meet the requirements of tourists, more and more existing directions are expanding. The peace and stability prevailing in our country, the atmosphere of goodness and mercy, Uzbek hospitality known throughout the world are an important factor in capturing the flow of tourists arriving in our country.

Recovery Of Worn Parts By Electrodes, Sh.Kh. Yuldashev, M.N. Masharipov

Journal of Tashkent Institute of Railway Engineers

Studies have been worked on the restoration of various perishable parts with welding. The main purpose of the research is to increase the strength of the working surfaces of parts different coating by welding different types of covered electrodes. Studies have been carried out to determine the composition, structure, rigidity and eroding resistance of the welded covering material. As a result of laboratory research, the optimal composition of the covering material is determined and the optimal method of welding them to the eroded working surface of the parts is selected.

Increase In The Throughput Capacity Of The “D-S” Section In Railway Transport, S.K. Khudayberganov, S.A Abduqodirov

Journal of Tashkent Institute of Railway Engineers

This article analyzes the current state of the throughput capacity of the railway section D-S. Based on foreign experience, research was carried out and measures were developed to increase the capacity of trains on the site. After analysis, the site’s throughput capacity was presented at Uzbek Railways JSC.

Methodological Approach To Substantiating Economically Feasible Volumes Of Work In The Road Sector, I.M. Tsarenkova

Journal of Tashkent Institute of Railway Engineers

This paper presents the results of a study aimed at developing methodological bases for selecting the most rational management decisions in the current economic situation to improve the transport and operational condition of individual sections of roads and the development of the national road network. The relevance of road infrastructure modernization as a system of measures aimed at improving it and improving consumer qualities is proved. In this regard, the theoretical substantiation of the content of the concept "modernization of highways" and the characteristics of the types of work performed in this case are presented. In the development of the …

Calculation Of Seismic Resistance Of Reinforced Concrete Railway Spans Without Prestressing Reinforcement, U.Sh. Raxmanov, G.B. Ismailova

Journal of Tashkent Institute of Railway Engineers

The article discusses the calculation of earthquake resistance of reinforced concrete rail spans without prestressing reinforcement. The calculation is made for the main and special combination of loads. The calculation results show that with a design seismicity of 8 points, the bending moment in the middle of the beam span will significantly decrease compared to a design seismicity of 9 points

Nonlinear Innovation Identification For Ship Maneuvering Modeling Via The Full-Scale Trial Data, Chunyu Song

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

Quantifying The Effects Of Climate Change On Pavement Performance Prediction Using Aashtoware Pavement Me Design, Md Shahjalal Chowdhury

Boise State University Theses and Dissertations

Climate change is one of the most concerning global issues and has the potential to influence every aspect of human life. Like different components of society, it can impose significant adverse impacts on pavement infrastructure. Although several research efforts have focused on studying the effects of climate change on natural and built systems, its impact on pavement performance has not been studied as extensively. The primary objectives of this thesis research was to quantify the effect of temperature changes on flexible pavement response and performance prediction using the AASHTOWare Pavement ME Design (PMED), and quantify the effects of Local Calibration …

Application Of Artificial Intelligence And Geographic Information System For Developing Automated Walkability Score, Md Mehedi Hasan

Dissertations

Walking is considered as one of the major modes of active transportation, which contributes to the livability of cities. It is highly important to ensure walk friendly sidewalks to promote human physical activities along roads. Over the last two decades, different walk scores were estimated in respect to walkability measures by applying different methods and approaches. However, in the era of big data and machine learning revolution, there is still a gap to measure the composite walkability score in an automated way by applying and quantifying the activityfriendliness of walkable streets. In this study, a street-level automated walkability score was …

Kentucky Transportation Cabinet Right Of Way Process Review (Phase I), Christopher W. Van Dyke, Bryan Gibson, Robin Baskette, Jeff Jasper, Candice Y. Wallace, Steven Douglas Kreis

Kentucky Transportation Center Research Report

From the Executive Summary:

The Kentucky Transportation Cabinet (KYTC) is responsible for planning, developing, constructing, and maintaining a prodigious inventory of roadway and bridge assets throughout the state. Project development is a complex process involving the coordination of numerous divisions and preconstruction disciplines across the Cabinet. On many projects, right-of-way (ROW) acquisition presents many challenges. Frequently, the ROW process is found on the critical path, meaning that it effectively governs a project’s overall duration. In some cases — especially on more complex projects — acquiring the ROW may take several years. Recognizing the need to shorten the duration and improve …

Eco-Driving Systems For Connected Automated Vehicles: Multi-Objective Trajectory Optimization, Ke Huang, Xianfeng Yang

Mineta Transportation Institute

This study aims to leverage advances in connected automated vehicle (CAV) technology to design an eco-driving and platooning system that can improve the fuel and operational efficiency of vehicles during freeway driving. Following a two-stage control logic, the proposed algorithm optimizes CAVs’ trajectories with three objectives: travel time minimization, fuel consumption minimization, and traffic safety improvement. The first stage, designed for CAV trajectory planning, is carried out with two optimization models. The second stage, for real-time control purposes, is developed to ensure the operational safety of CAVs. Based on extensive numerical simulations, the results have confirmed the effectiveness of the …

Performance Testing Of Hot Mix Asphalt Containing Biochar, Shadi Saadeh, Yazan Al-Zubi, Basel Zaatarah

Mineta Transportation Institute

In recent years, researchers have been able to identify asphalt binder additives, such as polymers and bio-binder, that can enhance the rheological and mechanical properties of asphalt binders. Earlier studies show that utilizing bio-binder as a partial replacement for asphalt binder has shown promising results in both mechanical and sustainability aspects. Biochar additions improved binder viscosity and low-temperature characteristics. Biochar, which is a byproduct of producing bio-binder, has shown enhanced rheological and mechanical properties when used as an additive to the asphalt binder. In this study, the mechanical properties of asphalt mixtures containing Biochar were investigated. In addition, its color …

Laboratory And Short-Term Field Performance Of Crumb Rubber Modified Asphalt Emulsion In Chip Seal Applications, Md Nafiur Rahman

LSU Master's Theses

Chip sealing is a commonly used pavement maintenance treatment that aims to delay pavement deterioration by reducing water infiltration and restoring skid resistance. Loss of aggregate and bleeding are considered the major failure mechanisms in chip seal, and therefore, are the main design criteria for this treatment method. The objective of this study was to evaluate the laboratory and short-term field performance of chip seals prepared with different types of asphalt emulsions, application rates, and aggregate blends. A newly introduced crumb-rubber modified asphalt emulsion was evaluated that allows chip seal installation at the same temperature of a standard emulsion. Types …

Interdisciplinary Education Outreach With Traffic Sensor Build Kits, Sarah V. Hernandez, Mariah B. Crews

Civil Engineering Teaching and Learning

The goal of this project was to attract K-12 students to transportation engineering careers through STEM outreach programs. To accomplish this goal, the object of the project was to design and implement maritime freight oriented educational outreach activities centered on traffic sensing technologies for middle, high school, and first-year college students. In MarTREC Project 5011 (Evaluating the Performance of Intermodal Connectors), the research team designed a low-cost, easily implementable LiDAR and Bluetooth sensor bundle that was capable of detecting, characterizing, and tracking freight trucks as they traveled to and from inland waterway port areas. The sensor provided data necessary to …

Examining The Effects Of Reducing The Cement Content Of Portland Cement Concrete Pavement, Bryan Casillas

Graduate Theses and Dissertations

Portland cement is a significant component in a concrete mixture. For concrete used in portland cement concrete pavement (PCCP), the Arkansas Department of Transportation (ARDOT) specifies a minimum cementitious material content of 564 lb/yd3 and a maximum water-cementitious material ratio of 0.45. Prior research conducted at the University of Arkansas, TRC 0603, indicated concrete mixtures used in five bridge decks throughout Arkansas achieved the required 28-day strength at seven days, and the measured compressive strength at 28 days was 30% greater than required. The use of high strength concrete in pavements throughout the state can increase cracking and consequently reduce …

Quantifying Workability, Compactability, And Cohesion Gain Of Asphalt Emulsion Cold In-Place Recycling, Sadie Casillas

Graduate Theses and Dissertations

To maximize the life and quality of a pavement, proper maintenance and rehabilitation are essential. Strategies for pavement rehabilitation with many sustainable benefits are pavement recycling. This dissertation focuses on two types of in-situ pavement recycling: Cold in-place recycling (CIR) stabilized with asphalt emulsion and full depth reclamation (FDR) stabilized with asphalt emulsion or foamed asphalt. One white paper (Chapter 2), two accepted peer reviewed journal articles (Chapters 3 and 4), and one submitted peer reviewed journal article (Chapter 5) are presented in this document to create better understanding of the unique material characterization of asphalt emulsion cold recycled materials, …

Verifying The Calcium Oxychloride Threshold In Cementitious Pastes, Fatoumata Traore

Graduate Theses and Dissertations

Calcium oxychloride (CAOXY) formation is a serious deterioration mechanism known to cause joint damage in concrete pavements. CAOXY is the product of a chemical reaction between calcium chloride (CaCl2) or magnesium chloride (MgCl) deicing salts and calcium hydroxide in the cementitious matrix. Currently, the accepted CAOXY threshold at which deterioration is mitigated in cementitious paste is 15 g/100 g paste (15 oz/100 oz paste); however, this limit was developed using flexural strength testing. For this investigation, the current threshold was evaluated using compressive strength and mass change over time in paste specimens exposed to CaCl2. Fly ash is used to …