Transportation Engineering Commons^™

Development Of A Mathematical Model For Calculating The Strength Of The Main Frame Of The Vl80s Electric Truck Body For Railway Engineering, Galina Khromova, Sergey Khromov, Davran Radjibaev

Journal of Tashkent Institute of Railway Engineers

A mathematical model was developed for the main body frame of the VL80s locomotive for railway engineering, including the justification of the design modes available in operation, the calculation of quasistatic characteristics for static loading modes, for single-thrust and double-thrust modes, for compression and tension modes. A calculation is also made on the effect of distributed inertial loads, then the power factors and stresses in the calculated sections of the main body frame of the VL80s electric locomotive are calculated. Summarizing conclusions are given on the maximum voltages in the design modes of the main frame of the VL80s electric …

Features Of Power Converters For Operation Of Electric Locomotives, Malika Nabievna Tuychieva

Journal of Tashkent Institute of Railway Engineers

The work analyzed features of technical characteristics of AC electric locomotives from other electric locomotives used in Uzbekistan. Converters are installed in the power circuit, with GTO (lockable thyristor) for electric locomotives "Uzbekistan," and for electric locomotives "Uzbekistan - yulovci" with IGBT (bipolar transistor with isolated gate). In general, two main current converters are installed on the locomotive. Each of them consists of four-quadrant pulse rectifier with three coordinates, intermediate DC link and 2 types of voltage inverters. One inverter serves for two frame-controlled bogie motors, the other for one axial-controlled bogie motor. In case of damage to any traction …

To The Conclusion Of The Variational Equation Of Motion Of Shell Structures Supported By Frames And Stringers, Farkhod Erkinovich Abdukadirov

Journal of Tashkent Institute of Railway Engineers

In this article is given the construction of the variational equation of motion of the shell structure supported by frames and stringers. Using the Hamilton - Ostrogradsky variational principle, systems of differential equations of motion of shell elements are obtained.

Damping Cell From Gallium Arsenide With Plasma Contacts In An Extreme Gas Discharge Cell, Khurshidjon Tolibovich Yuldashev, Sherzod Sodikjonovich Akhmedov, Jasurbek Mahammadovich Ibrohimov

Journal of Tashkent Institute of Railway Engineers

The results of an experimental study of the photocurrent in a semi-insulating gallium arsenide with plasma contacts are presented in order to identify the conditions under which the generation interaction of a plasma by a semiconductor becomes significant. The experimental data are compared with the results predicted by the simplified theory.

Resource-Saving Maintenance And Repair Of The Traction Transformer Based On Its Diagnostics, Mirzhalil Sagatovich Yakubov, Kamolbek Hamidovich Turdibekov, Absaid Khurramovich Sulliev

Journal of Tashkent Institute of Railway Engineers

Based on a generalized analysis of the compiled mathematical model of the maintenance and repair system of a traction transformer of an electrified railway, a resource-saving strategy is made based on the use of the results of technical diagnostics and providing the calculation of the optimal periodicity of the overhaul periods according to the values of the practical probability of failures, the number of factors wagging on Actual residual life and exploited in various operating conditions oviyah his work.

Choosing The Optimal Scheme Of Placement Of Thermal Trains On The Chart Of The Movement Of Trains, Muslimа Djalalovna Akhmedova, Dilmurod Baхodirovich Butunov, Sardor Askarovich Abdukodirov

Journal of Tashkent Institute of Railway Engineers

To analyze the methods of selecting the optimal scheme of layout of thermal trains at railway stations. Graphic and mathematical modeling methods are used. The factors influencing the selection of the optimal train schedule have been identified.Existing trains of thermal trains have been analyzed the schemes and mathematical formulas have been developed. Frequently used mathematical formulas at the railway stations, thermal trains create smooth and efficient traffic, and the train traffic destroys the possibility of direct adjustment.

To The Question Of Dispatching Regulation Of Overtaking Freight Trains, Samandar Bahtiyorovich Sattorov, Ruslanovna Ibragimova Gulshan, Daurenbek Ihtiyarovich Ilesaliev

Journal of Tashkent Institute of Railway Engineers

This article discusses the problems of the influence of accelerated freight trains on station and distillation intervals, as well as on a simple freight train under overtaking. The relevance of this article is due to the fact that irrational dispatch regulation of overtaking of freight trains with accelerated trains negatively affects the throughput of the railway line.

Linking Train Schedule Assignments To A Solid Schedule, Alexander Aleksanlrovich Svetashev, Nodir Qodirovich Aripov, Nargiza Faritovna Svetasheva

Journal of Tashkent Institute of Railway Engineers

The article provides an analysis of the composition of the sorting station during the accumulation of trains and the formation of trains with their departure on a solid schedule in order to establish dependencies that allow you to determine the cost of wagon-hours for the accumulation of cars and the rationale for the use of a solid schedule. The paper highlights the features of the process of accumulation of cars with a solid schedule as opposed to accumulation with a flexible schedule. As a result of modeling the composition of the solid schedule, the necessary parameters were calculated, which were …

Results Of Application Of The Methods “Conditional Group Sorting” And “Combinatorial Sorting” Duringthe Multi-Group Trains Formation, Sakijan Kabildjanovich Khudayberganov, Shinpolat Mansuraliyevich Suyunbayev, Alfiya Mirkhatimovna Bashirova, Sherzod Bakhromugli Jumayev

Journal of Tashkent Institute of Railway Engineers

At present, the formation of multi-group freight trains on the sorting stations is the actual issue. The main raisons are: there is no exact (developed) technology, in order to form multi-group trains on the sort stations and also, formation of such type of trains according to the established procedure based on many years of experience of the relevant personnel. In this article, the results of the applied methods are presented “Conditional group sorting” and “Combinatorial sorting” during the multi-group trains formation on the sorting station JSC Uzbek Railways. The efficiency of the method “Conditional group sorting” has been revealed regarding …

Three-Way Thermal Model Of Asynchronous Traction Engines For Diagnostics Of Their Technical Condition, Zhavkharbek Sulton Ugli Fayzullaev

Journal of Tashkent Institute of Railway Engineers

Mathematical models of the thermal processes of traction induction motors are developed. An induction motor is considered as a thermal system consisting of three bodies (stator winding, stator magnetic circuit and rotor), in which heat transfer is taken into account not only between the respective bodies, but also heat transfer between each body and the environment. It is shown that the steady-state excess of the stator winding temperature of a traction induction motor depends on the multiplicity of the stator winding current, the coefficient of electrical energy loss, and also on the temperature coefficient of resistance of the material of …

An Example Of Calculating The Speed Of The Railway Carriage On The Accelerating Slope Of The Hump, Shukhrat Batirovich Djabbarov

Journal of Tashkent Institute of Railway Engineers

The paper content is based on classic provisions of mechanics (D’Alembert principle) for non-ideal communication. The authors provide with the analytical proof of that the linear acceleration of the car when it is uniformly accelerated along the descending part of the hump depends on the force that affects the car to roll down the slope of the hump, on the force of resistance of all kinds, on the adjusted weight of the car with load taking into account the moment of flywheel action. At the same time, the results of calculations prove that the rotating parts weight practically does not …

Developing A Baseline For Customer Satisfaction In The Kentucky Transportation Cabinet's Department Of Vehicle Regulation, Steven Andrew Martin, Christopher W. Van Dyke, Jennifer R. Walton, Jeeyen Koo, Valerie Keathley Helil, Brian K. Howell

Kentucky Transportation Center Research Report

Among the Kentucky Transportation Cabinet’s (KYTC) business units, the Department of Vehicle Regulation (DVR) has the most interactions with members of the public and other government agencies. Given its high profile and public visibility, it is critical for the department to provide high-quality customer service. Lacking data on customer perceptions of DVR’s level of service, the department commissioned researchers at the Kentucky Transportation Center (KTC) to conduct a baseline and rebaseline customer satisfaction surveys. Along with administering surveys to external customers, KTC’s research team also polled DVR staff to gauge employee morale and identify areas which could be improved. Approximately …

Performance Of Us Concrete Highway Bridge Decks Characterized By Random Parameters Binary Logistic Regression, Omar Ghonima, Jason C. Anderson, Thomas Schumacher, Avinash Unnikrishnan

Civil and Environmental Engineering Faculty Publications and Presentations

This study employs a random parameters binary logistic regression (LR) to characterize the impact of environmental and structural parameters on concrete highway bridge deck deterioration nationwide. Two specific gaps in the literature are addressed: (1) the use of a nationwide dataset for analysis, and (2) the implementation of a methodology to account for unobserved heterogeneity. A total of 3,262 bridge deck deterioration observations derived from the authors’ nationwide concrete highway bridge deck performance inventory (NCBDPI) database were used in this study. The deterioration rate (DR) was computed as the decrease in the concrete bridge deck condition rating ( …

Over Height Impact Avoidance And Incident Detection System, Suvash Chapain, Aly Mousaad Aly

Faculty Publications

During the construction and repair of bridges, work platforms or construction-related containment may result in restricted vertical clearances at a work location. Some tractor-trailer combinations are prone to over-height collisions at these locations. Collisions are a hazard to all drivers, and repair of the damage typically causes traffic delays. Appropriate solutions to this problem will focus on the prevention of collisions by detecting over-height vehicles and directing the drivers to take an alternate safe route. This presentation addresses the design and functionality of smart detection/alert systems that can be set up well in advance of a known vertical clearance restriction …

Guidelines For Using Streetlight Data For Planning Tasks, Hong Yang, Mecit Cetin, Qingyu Ma

Computational Modeling & Simulation Engineering Faculty Publications

The Virginia Department of Transportation (VDOT) has purchased a subscription to the StreetLight (SL) Data products that mainly offer origin-destination (OD) related metrics through crowdsourcing data. Users can manipulate a data source like this to quickly estimate origin-destination trip tables. Nonetheless, the SL metrics heavily rely on the data points sampled from smartphone applications and global positioning services (GPS) devices, which may be subject to potential bias and coverage issues. In particular, the quality of the SL metrics in relation to meeting the needs of various VDOT work tasks is not clear. Guidelines on the use of the SL metrics …

Finding Patterns In Subsurface Using Bayesian Machine Learning Approach, Wang Hui

Civil and Environmental Engineering and Engineering Mechanics Faculty Publications

Stochastic simulation approaches and uncertainty quantification are usually adopted for gaining insight into variability in soil stratigraphy configurations. Previous investigations at geotechnical site characterization and interpretation can be broadly categorized into geostatistics- and process-based methods. On the other hand, modern site exploration techniques provide high-quality, dense datasets in physical spaces with high resolution, either directly from sensors (for example, cone penetration testing data) or indirectly from geophysical inversion (such as seismic inversion, electromagnetic induction inversion, and ground penetrating radar). In this work, anisotropy and heterogeneity are considered as possible patterns that inherently exist in the observations, and these are inferred …

Improvement Of Low Traffic Volume Gravel Roads In Nebraska, Richard L. Wood, Yong-Rak Kim, Yijun Liao, Mohammad E. Mohammadi

Nebraska Department of Transportation: Research Reports

In the state of Nebraska, over one-third of roadways are unpaved, and consequently require a significant amount of financial and operational resources to maintain their operation. Undesired behavior of surface gravel aggregates and the road surfaces can include rutting, corrugation, and ponding that may lead to reduced driving safety, speed or network efficiency, and fuel economy. This study evaluates the parameters that characterize the performance and condition of gravel roads overtime period related to various aggregate mix designs. The parameters, including width, slope, and crown profiles, are examples of performance criteria. As remote sensing technologies have advanced in the recent …

Synthesis Of Repair Practices Of Damaged Precast/Prestressed Concrete Girders, George Morcous, Richard L. Wood, Antony Mohsen Kamal Masoud Kodsy

Nebraska Department of Transportation: Research Reports

Bridge girders are constantly subjected to various types of damage during their service life. There is currently limited knowledge or guidelines provided by the NDOT Bridge Office Policies and Procedures (BOPP) regarding the assessment and repair procedures of damaged precast/prestressed concrete girders. This report aims to develop a comprehensive repair manual for precast/prestressed concrete girders subjected to damage caused by over-height vehicular collision and damage located at the girder ends. Over-height vehicular collision damage typically occurs at the middle portion of the exterior girders and the primary concerns are focused on flexural deficiencies. Girder end damage can occur due to …

Analysis Of Crashes Involving First Responder Vehicles, Josie Gray

Doctoral Dissertations and Master's Theses

First responders face many hazards that put their lives at risk while on duty. A review of the National Law Enforcement Officers Memorial Fund statistics shows that 553 police officers died in the line-of-duty between 2008 and 2017 as a direct result of a traffic related incidents. Sadly, the nation’s first responders are exposed to factors which make them uniquely vulnerable to traffic related injuries and deaths. The goal of this research is to investigate and analyze crashes involving first responder vehicles and struck-by crashes. This project concludes that approximately 1.2% of the crashes in the state of Florida involve …

Crime And Harassment On Public Transportation: A Survey Of Sjsu Students Set In International Context, Asha Weinstein Agrawal, Anastasia Loukaitou-Sideris, Cristina Tortora, Yajing Hu

Mineta Transportation Institute

Communities around the world are gradually becoming aware that transit riders, and especially women, are often victims of a wide range of offenses of a sexual nature that happen on buses and trains, and at bus stops and train stations. Better understanding the extent and nature of sexual harassment on transit is a critical issue for transit operators and society at large. If fear of sexual crime limits if and how people ride transit, the result is reduced mobility for certain segments of the population, as well as lost ridership for transit agencies.

For this study, we surveyed 891 students …