Transportation Engineering Commons^™

Development Of High-Performance Rapid Patching Materials For Pavement Repair, Gholami Shayan, Jiong Hu, Yong-Rak Kim

Nebraska Department of Transportation: Research Reports

Concrete pavements exhibiting severe distresses which require patching are commonly observed in the concrete pavement in Nebraska. Due to the requirements of opening pavement to traffic after placing the rapid patching materials, it is essential for that concrete to achieve high early strength. To ensure this, a high cement content and chloride-based accelerators are currently used in the Nebraska Department of Transportation (NDOT) Portland cement-based rapid-patching materials. Besides its associated high cost, high cement content tends to result in a less stable mix with high shrinkage, high heat of hydration, and high cracking potential. In addition, using chloride-based accelerators has …

Condition Assessment Of Bridge Decks With Asphalt Overlay, Sepehr Pashoutani, Jinying Zhu

Nebraska Department of Transportation: Research Reports

Ground penetrating RADAR (GPR) is a widely used nondestructive testing (NDT) method for bridge deck evaluation. However, the current GPR signal and data processing software and algorithms are not able to provide comprehensive information about bridge deck condition. Although the original objective of this research project was to develop GPR analysis algorithms for condition assessment of bridge decks with asphalt overlay, the scope of work has been expanded to concrete bridge decks with or without overlays.

In this study, the research team developed a complete GPR analysis procedure that includes the following components: 1) obtain zero-time for GPR reflection at …

Evaluating Urban Downtown One-Way To Two-Way Street Conversion Using Microscopic Traffic Simulation, Bernice Liu

Master's Theses

Located in the heart of Silicon Valley, Downtown San Jose is attracting new residents, visitors, and businesses. Clearly, the mobility of these residents, visitors, and businesses cannot be accommodated by streets that focus on the single-occupancy automobile mode. To increase the potential for individuals to use non-single-occupancy modes of travel, the downtown area must have a cohesive plan to integrate multimodal use and public life. Complete streets are an integral component of the multi-modal transport system and more livable communities. Complete streets refer to roads designed to accommodate multiple modes, users, and activities including walking, cycling, transit, automobile, and nearby …

An Application Of Bayesian Multilevel Model To Evaluate Variations In Stochastic And Dynamic Transition Of Traffic Conditions, Emmanuel Kidando, Ren Moses, Thobias Sando, Eren Erman Ozguven

Civil and Environmental Engineering Faculty Publications

© 2019, The Author(s). This study seeks to investigate the variations associated with lane lateral locations and days of the week in the stochastic and dynamic transition of traffic regimes (DTTR). In the proposed analysis, hierarchical regression models fitted using Bayesian frameworks were used to calibrate the transition probabilities that describe the DTTR. Datasets of two sites on a freeway facility located in Jacksonville, Florida, were selected for the analysis. The traffic speed thresholds to define traffic regimes were estimated using the Gaussian mixture model (GMM). The GMM revealed that two and three regimes were adequate mixture components for estimating …

Fractional Order State Feedback Control For Improved Lateral Stability Of Semi-Autonomous Commercial Heavy Vehicles, Rasheed Mazen Abdulkader

Graduate Theses and Dissertations

With the growing development of autonomous and semi-autonomous large commercial heavy vehicles, the lateral stability control of articulated vehicles have caught the attention of researchers recently. Active vehicle front steering (AFS) can enhance the handling performance and stability of articulated vehicles for an emergency highway maneuver scenario. However, with large vehicles such tractor-trailers, the system becomes more complex to control and there is an increased occurrence of instabilities. This research investigates a new control scheme based on fractional calculus as a technique that ensures lateral stability of articulated large heavy vehicles during evasive highway maneuvering scenarios. The control method is …

The Application Of Gray-Scale Level-Set Method In Segmentation Of Concrete Deck Delamination Using Infrared Images, Chongsheng Cheng, Zhigang Shen

Department of Construction Engineering and Management: Faculty Publications

Conventional nondestructive delamination detection of concrete pavements through thermography is often based on temperature contrasts between delaminated and sound areas. Non-uniform backgrounds caused by the environmental conditions are often challenging for contrast-based methods to robustly differentiate the delaminated areas from the sound areas. Instead of focusing on the temperature contrast, this study proposes a temperature gradient-based level set method (LSM) to detect boundaries for delamination segmentations. A modified edge indicator function is developed to represent the normalized temperature gradient of a thermal image. The experimental study was conducted to evaluate its applicability and stability for boundary detection in terms of …

Evaluation Of The Rheological Behaviors And Molecular Composition Properties Of Crumb Rubber Modified Emulsion For Chip Seal, Md Tanvir Ahmed Sarkar

LSU Master's Theses

An experimental study was conducted to characterize the chemical, molecular, and rheological properties of different asphalt emulsions including a newly introduced tire rubber modified asphalt emulsion. One tire rubber modified asphalt emulsion (CRS-2TR), two conventional emulsions (CRS-2 and CRS-2P), and one asphalt rubber binder (AC20-5TR) were evaluated. The differences in functional groups, chemical composition, and molecular weight distribution of the asphalt binder and emulsions under different aging conditions (Original, RTFO-aged, and PAV-aged) were evaluated by the Saturates, Aromatics, Resins and Asphaltenes (SARA) fractionation test, High-Pressure Gel Permeation Chromatography (HP-GPC), and Fourier Transform Infrared Spectroscopy (FTIR) test, respectively. Superpave Performance Grade …

Application Of Modern, Effective Materials In Rail Road Reinforced Bridge Elements, U.Z. Shermuxamedov, F.Z. Zokirov

Journal of Tashkent Institute of Railway Engineers

The article is about reducing the construction costs of railroad bridges and the effective use modern building materials. The article compares the technical characteristics of composite fittings and metal fittings and their proportionality. Indeed, recourse saving of metal and composite fittings, as well as factors of localization of construction is compared

Mathematical Modeling Of The Structure Cellular Concrete, Anvar Ishanovich Adilkhodjayev, E.V. Shipacheva, S.S. Shaumarov

Journal of Tashkent Institute of Railway Engineers

The article presents the developed mathematical model of the structure of cellular concrete, which allows one to establish pore sizes and characteristics of inter-pore walls corresponding to the required thermal conductivity and strength of the material, and the results of its numerical implementation are presented

Research Of Surface Condition Of The Rails Rollingon Sections Of High-Speed And High-Speed Train Traffic, E.B. Abdualiyev

Journal of Tashkent Institute of Railway Engineers

This article analyzes the intensity of impulse irregularities that occur on the surface of the rolling rail heads on the section of high-speed and high-speed train traffic. On the rolling surface of the rail heads, the formation of pulse irregularities is observed, which are fixed by the measuring system of the track measuring car No. 106. This shows the main character of damage to the surface of the rail head ride

Method Of Calculation Of Self-Stressed Concrete Slabs Supported Along The Contour, S.S. Salixanov

Journal of Tashkent Institute of Railway Engineers

The paper presents the developed method for calculating the contour-supported slab of self-stressed concrete. Reinforced concrete slab on the tension cement replaces the traditional construction of the bridge. In this article, in order to exclude reinforcement, the problem of determining the stress-strain state of self-stressed concrete slabs supported along the contour is considered. The values of stresses in the upper and lower faces of the concrete slab, as well as the bending moment in the middle section of the slab

Construction Features Of Transport Tunnels In The Mountain Areas Of Uzbekistan, M.Х. Miralimov, Sh.U. Normurodov

Journal of Tashkent Institute of Railway Engineers

The paper provides information about the transport tunnel 19,2 km long which was recently completed on new electrified railway line “Angren-Pap” in the mountain area of Uzbekistan. It is noted that the most actual for transport tunnels is account of seismic activity of geological environment in the process of design, construction and maintenance. There are given the effects of earthquakes on underground structures and regularities of displacement and stress distribution in the tunnel linings under seismic impacts. The accumulated experience of earthquake-resistant construction in Uzbekistan shows the need to consider several design schemes for the interaction of tunnels in the …

Research Of System Conditions For Formation Of Failure On Mathematical Models By The Results Of The Research Of Reinforced Concrete Bridges, E.T. Yaxshiev, F.Z. Zokirov, A.B. Karimova

Journal of Tashkent Institute of Railway Engineers

Based on the data of field surveys, the results of assessing the state of reinforced concrete span structures of bridges and characteristic defects that occur in the structure during operation are presented. An analysis of the results of inspections and periodic inspections responsible for the operation of artificial structures shows that a significant part of reinforced concrete spans has various types of defects and damage to load-bearing structures. Studies show that defects have a significant impact on the operational properties of reinforced concrete spans, leading both to a limitation of the speed regime of train movements and to the emergence …

Development Of A Hybrid Model Of A Thermophotogenerator And An Empirical Analysis Of The Dependence Of The Efficiency Of A Photocell On Temperature, S.I. Zokirov, M.N. Sobirov, H.Kh. Tursunov, M.M. Sobirov

Journal of Tashkent Institute of Railway Engineers

This paper presents the results of experiments to analyze the efficiency of the photocell of selective radiation of a photothermogen generator at various densities. It was found that in a relatively hot climate (Uzbekistan, Ferghana), the performance of the solar cell is stable at temperatures from +25 to +35. It was found that the lowest solar cell performance (from single-crystal silicon) was about 6% and 13%, and the highest - about 15% and 16% for typical and selective lighting with triple density in a certain period of time (up to 3 and 15 minutes), respectively. The lux-ampere characteristic is given; …

Diagnostic Method For Current Collectors Of Freight Electric Locomotives In The Conditions Of The Republic Of Uzbekistan, B.B. Abdurakhmanov

Journal of Tashkent Institute of Railway Engineers

The paper provides a method for diagnosing current collectors of freight electric locomotives in the Republic of Uzbekistan in order to increase the reliability of current collectors, as well as reduce the time for their operation. A large number of failures attributable to current collectors, in particular to current collector inserts, were revealed. Improving the reliability, which will improve the reliability of the electric locomotive as a whole. To date, the electric locomotives of the park of the Republic of Uzbekistan do not have the diagnostic tools to determine the condition of current collector inserts. The article provides an algorithm …

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 …

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%.

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

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

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 …

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

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 …

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

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 …

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 …

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

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

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 …

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 …

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