Engineering Commons^™

Dynamic Characteristics Of The New Magnetic Modulating Dc Difference Converter, Sultan Fayzullayevich Amirov, Sarvarbek Xamrayevich Jumaboyev, Nurilla Raxmatullaevich Yuldashev

Journal of Tashkent Institute of Railway Engineers

It is shown that when a jump-like differential current is applied to the input of the transducer, its transient response consists of the sum of one steady-state and two free harmonic components with a frequency equal to double the modulation current frequency, the free components of which decay with rates depending on the time constants, respectively, the measuring and modulation magnetic circuit, and when a pulsating differential current with a frequency is applied to the input of the converter, the transient response consists of the sum of one harmonic steady-state component with a frequency equal to the modulation current frequency …

The Research Of Various Transient Processes In Current Transformers, Sultan Fayzullayevich Amirov, Shavkat Mukhsimov, Otabek Tashmuhammatovich Boltayev

Journal of Tashkent Institute of Railway Engineers

In the article the transients occurring in current transformers are investigated and the values of secondary transient currents are determined using the operator's method with the help of a mathematical model of a wide-range current transformer using various primary sources. Using the obtained results, the regularities of secondary currents change over time are analyzed. It determined that, in the developed the wide-range current transformer, the influence of the aperiodic component of the primary current on the transformer current decreases with increasing the angle and creating a counter magnetomotive force in the core to expand the upper limit of the conversion …

The Features Of The Power Scheme Of The New Electric Locomotive 3es5К (Ermak) Of The Park Of Uzbekistan, D.O. Radjibaev

Journal of Tashkent Institute of Railway Engineers

The paper analyzes the characteristics and features of the traction chain of the 3ES5K electric locomotive. The design features of the electric locomotive are noted. A comparative analysis of traction and energy indicators with an electric locomotive of the VL80s series is carried out. Based on the results of the analysis, the indicators of energy consumption and running time on the existing section of Angren-Pap with the same mass of the train were derived

Structural Scheme Of A Formalized Model Of The Process Of Accounting And Control Of Automation And Telemechanics Devices, D.Kh. Baratov, Nazirjhon Mukarramovich Aripov

Journal of Tashkent Institute of Railway Engineers

The article deals with the issues of functional support for the automated system of accounting and control of railway automation and telemechanics devices: signaling, centralization and blocking; presents the components of the electronic Executive part of the system; offers a conceptual model and describes the design features of the developed automated system.

To The Question Of Organization Of Client Radio Communications On Railway Transport, Natalya Valerevna Yaronova, Aliye Ayderovna Ametova

Journal of Tashkent Institute of Railway Engineers

The article presents a way of organizing client radio communications using the high-speed «Afrosiyob» train as an example. The provision of additional services to train passengers is an essential condition for increasing the status of railway transport and its efficiency. It consists in organizing passenger access to the Internet and to multimedia services along the train

Determination Of Technical Condition Of Passenger Locomotives Using Diagnostic Equipment, M.Sh. Valiyev, X.R. Qosimov

Journal of Tashkent Institute of Railway Engineers

The account of a real technical condition of the equipment of the locomotive at planning of volumes of its repair is one of the major reserves of reduction of working costs of railways and decrease in the cost price of transportations. The continuous control of a technical condition of the locomotive in operation is carried out with use of stationary and onboard means of technical diagnostics. In article the technique of an integrated estimation of a technical condition of quality of working process in the cylinder of a diesel engine with use of onboard diagnostic aids is offered.

Malfunction Analysis In The Freight Cars Used In Uzbekistan And Measures For Their Elimination, Nodir Botirovich Adilov

Journal of Tashkent Institute of Railway Engineers

This article uses the analysis of malfunctions of the load-carrying apparatus of freight car structures used in Uzbekistan. The reasons for the occurrence of malfunctions in the load car structures are studied. It seems that in order to determine the technical condition of the device, it is possible to increase the reliability of the stored device by making the correct conclusion from the fault signs derived from the design parameters using information received from the controlled stands.

To Improve The Coupon System For Monitoring Compliance With Labor Safety At The Enterprises Of Jsc "Uzbekistan Temir Yullari», Sunnatulla Sulaymanov, Miraziz Mirkadirovich Talipov, Аbdigofur Dustov

Journal of Tashkent Institute of Railway Engineers

The article discusses the issues of improving the coupon system for monitoring compliance with labor safety by establishing the level of labor protection at work and ranking the violations committed by departments and the enterprise as a whole. A modernized structure of the labor protection management system has been developed and a coupon control system has been proposed, integrated with three-level monitoring of the conditions and labor protection, which takes into account the magnitude of the coefficient of labor protection.

To The Prevention Of Fires Related To Accidents Of Municipal-Energy Networks Of The Destroyed Part Of The City, Sunnatulla Sulaymanov, Khasan Mirzakhitovich Kamilov, Miraziz Mirkadirovich Talipov

Journal of Tashkent Institute of Railway Engineers

This article presents the results of a theoretical study of the quantitative indicators of fires in the devastated part of the city during devastating earthquakes and a device for preventing fires by shutting off the power supply of residential buildings.

About The Influence Of The Structural-Phase State On The Functional Properties Of Titanium Nickelide, N.U. Abduraimova, Yu.N. Mansurov

Journal of Tashkent Institute of Railway Engineers

For inducing form memory effects of FMEs, at least one deformation of the alloy is required. Traditionally, it is carried out at room temperature or in liquid nitrogen. The influence of the initial phase composition on different schemes of FME and OEPF guidance has been studied. The evolution of reversible and complete reversible deformation, depending on the induced deformation, has an extreme character, while the position of the maximum depends on the structural state: for an equiatomic alloy Ti-50.0 at.% Ni - range εt = 1215%; for Ti-50.7 at.% Ni.

Increasing The Strength Of Worn Parts Withcomposite Materials, Masud Numonzhonovich Masharipov, Shuhratbek Xabibullo Ogli Yuldashev

Journal of Tashkent Institute of Railway Engineers

Researches are carried out on the built-up curly details. The aim of the study is to restore worn surfaces of parts by surfacing of powder composite materials. Inves-tigations are carried out to determine the composition, structure, hardness and wear resistance of the deposited layers. As a result of laboratory studies, the opti-mal composition of the surfacing material and the rational method of applying them to the worn surfaces of machine parts are selected.

Application Of Fiber Optical Sensors For The Account Of Axes Of The Mobile Composition Of Automatic And Telemechanical Systems On Railway Transport, Aziz Azimovich Saitov

Journal of Tashkent Institute of Railway Engineers

In this scientific work, modern optical sensors based on the use of modern electronic electromagnetic relay counters used on railways, stages and stations in the Republic of Uzbekistan are investigated and presented. The electromagnetic relay device ESSO increases the transmission of false messages under the influence of magnetic induc-tion. This leads to a decrease in the level of reliability. The study showed that the recommended axle counting sensors have high sensitivity when passing wheels on sensors on hauls and stations, which can increase reliability and reduce operating costs for train movements, trunk and station roads.

Application Of The Volterra Tray Model In Solving The Problems Of Optimizing The Supply Of Grain Elevators By Wagons, Nazirjhon Mukarramovich Aripov, Daurenbek Ixtiyarovich Ilesaliev

Journal of Tashkent Institute of Railway Engineers

Ensuring uniform supply of wagons for loading and unloading of goods is one of the main tasks of the transport process. Existing methods for solving the issues of ensuring the rhythmicity of the supply of wagons for loading grain often do not allow us to identify the causes of the technological shortage of wagons. In this regard, in the framework of this work, the aim of the study is to increase the efficiency of the organization of providing grain elevators with wagons using models.

Analysis Of Malfunctions Of Brake Equipment Of Freight Cars On The Angren-Pap Line, Yadgor Ozodovich Ruzmetov, Sardor Gafurjanovich Inagamov

Journal of Tashkent Institute of Railway Engineers

The article analyzes the failures of the braking equipment of freight cars operated on the Angren – Pap section of the “Uzbekistan temir yullari” railway. The electrified Angren – Pap railway line was built in order to create a new China-Central Asia-Europe railway corridor, as well as to form a unified railway network in Uzbekistan. It is an important link not only for Railways, but also for the entire economy of the Republic of Uzbekistan. One of the problems of exploitation that arise in the friction node of car part brake pads is high brake pad wear and temperature rise …

Improvement Of The Cooling System During Storage In The Process Of Agricultural Products, Jamshid Renatovich Kobulov, Jamshid Sayfullayevich Barotov, Diyor Shomurotovich Boboyev

Journal of Tashkent Institute of Railway Engineers

The article outlines the optimal options for quality storage and product placement, from the acceptance of agricultural products to the delivery process. The factors that lead to natural losses and decomposition during cargo storage are identified and eliminated. In addition, the process of storing and delivering products is analyzed and proposals for addressing deficiencies in the existing logistics network are developed.

Prototype System For Implementing The Ultrasonic Guided Wave Method On The Field, Ece Erdogmus, Eric Garcia, Michael Schuller, Ahmad Shoaib Amiri

Nebraska Department of Transportation: Research Reports

This report presents the latest improvements in a recently developed nondestructive testing (NDT) technique for early detection of various flaws such as corrosion, delamination, and concrete cracking in reinforced concrete (RC) bridge decks. The method, named Ultrasonic Guided Wave Leakage (UGWL) method by the developing authors, involves use of internal steel reinforcement (rebar) as a wave guide for transmitting ultrasonic waves through the system and the measurement of leaked energy at the surface of the concrete. This report builds upon the progress made in the previously published phases of the project (M029 and M066), and aims to further explore the …

Effect Of Socioeconomic Factors On Kentucky Truck Driver Crashes, Nikiforos Stamatiadis, Shraddha Sagar, Samantha Wright, Aaron Berry Cambron

Kentucky Transportation Center Research Report

Kentucky crash data for the 2015-2016 period reveal that per capita crash rates and increases in crash-related fatalities in the state outpaced the national average. To explain why the U.S. Southeast sees higher crash rates than other regions of the country, previous research has argued the region’s unique socioeconomic conditions provide a compelling explanation. Taking this observation as a starting point, this study uses an extensive crash dataset from Kentucky to examine the relationship between highway safety and socioeconomic and demographic characteristics. Its focus is single- and two-unit crashes that involve commercial motor vehicles (CMVs) and automobiles. Using binary logistic …

Evidence From Urban Roads Without Bicycle Lanes On The Impact Of Bicycle Traffic On Passenger Car Travel Speeds, Jaclyn S. Schaefer, Miguel A. Figliozzi, Avinash Unnikrishnan

Civil and Environmental Engineering Faculty Publications and Presentations

A concern raised by some motorists in relation to the presence of bicycles on urban roads without bicycle lanes, discussed in part of the traffic literature, is that cyclists will slow down motorized vehicles and therefore create congestion. This research answers this question: do bicycles reduce passenger car travel speeds on urban roads without bicycle lanes? To answer this question, a detailed comparative analysis of the travel speeds of passenger car (class two vehicles) on lower volume urban roads without bicycle lanes is presented. Speed distributions, the mean, and the 50th and 85th percentile speeds for two scenarios were examined: …

User-Rated Comfort And Preference Of Separated Bike Lane Intersection Designs, Christopher Monsere, Nathan Mcneil, Rebecca Sanders

Civil and Environmental Engineering Faculty Publications and Presentations

Improved bicycle infrastructure has become increasingly common in the United States as cities seek to attract new riders, including the demographic who do not feel comfortable riding with motor vehicle traffic. A key tool in designing low-stress networks is the use of separated or protected bicycle lanes, and intersections are the critical links. This paper presents an analysis of the perceived level of comfort of current and potential bicyclists from 277 survey respondents who rated 26 first-person video clips of a bicyclist riding through mixing zones, lateral shifts, bend-in, bend-out, and protected intersection designs. A total of 7,166 ratings were …

Full-Depth Reclamation Of Asphaltic Concrete Pavements, Tony L. Beckham, Brad W. Rister, Charlie Sun

Kentucky Transportation Center Research Report

The Kentucky Transportation Cabinet (KYTC) has used a full-depth reclamation (FDR) process over the past few years to rehabilitate asphalt pavements exhibiting widespread base failures. FDR transforms existing hot-mix asphalt (HMA) pavement and underlying granular materials into a stabilized base layer. The stabilized layer is then overlaid with a new pavement surface layer. Until now, deciding when and how to use the FDR process has not been well specified in Kentucky — the Cabinet has commonly used a Special Note for Cement Stabilized Roadbed as guidance and relied on the contractor for acceptable materials design. Previous research conducted by the …

Potential Effect Of Cable Median Barriers On Commercial Vehicle Crossover Crashes, Nikiforos Stamatiadis, Shraddha Sagar, Samantha Wright, Eric R. Green, Reginald R. Souleyrette, Michael A. Fields, Teng Alex Wang

Kentucky Transportation Center Research Report

In 2016, commercial motor vehicles (CMVs) were involved in 4,079 fatal crashes in the U.S., representing 11.8 percent of all fatal crashes. State of Kentucky crash data for 2015-2016 show that per capita crash rates and increases in crash-related fatalities exceeded the national average. Crossover crashes occur when a vehicle leaves its intended path and veers into the path of oncoming traffic, typically resulting in head-on or sideswipe opposite direction crashes. Cable median barriers are a countermeasure which can potentially be used to mitigate crossover crashes. This research investigated the potential effectiveness of cable median barriers on CMV crashes. Analysis …

Evaluation Of Alternative Rumble Strip Designs, William Nicholas Staats, Kenneth R. Agent, Brian K. Howell

Kentucky Transportation Center Research Report

Since Kentucky’s initial rumble strip designs were adopted, there has been additional research and experimentation in other states with alternative designs as a response to complaints from the public about noise pollution caused by rumble strips. The new research indicates that other rumble strip designs might provide increased interior noise/vibration with decreased exterior noise. Application of these alternative designs in Kentucky could result in improved rumble performance, reduced damage to new pavement, decreased noise pollution, installation on roadways with lower speed limits, and allow reinstallation of rumbles on thin overlays/microsurfacing.

The research team reviewed national and state guidelines for conventional …

Traffic Incident Management Dashboard, Xu Zhang, Reginald R. Souleyrette, Alex Wang, Paul Ross, Eric R. Green, Mei Chen

Kentucky Transportation Center Research Report

Traffic incidents remain all-too-common events on Kentucky’s roadways. They negatively impact the safety of the traveling public and emergency responders and cause significant traffic delays. Congestion associated with incidents can instigate secondary crashes, exacerbating safety risks and economic costs. Traffic incident management (TIM) provides an effective approach for managing highway incidents and reducing their occurrence and impacts. This report discusses the establishment of and methods of calculation for five TIM performance measures that can be used by the Kentucky Transportation Cabinet (KYTC) to improve incident response. The measures are: Roadway Clearance Time, Incident Clearance Time, Secondary Crashes, First Responder Vehicle …

Research On School Zone Safety, Aemal Khattak, Yashu Kang

Nebraska Department of Transportation: Research Reports

This research investigated different aspects of school zone safety including the effects of speed differentials on drivers’ speeds in active school zones, the effects of school and surrounding characteristics on drivers’ speeds in active school zones, and the safety benefits and costs associated with active school zones. The research team identified 18 schools in Nebraska for data collection that consisted of drivers’ speed data, school and surrounding characteristics, and 2014-2018 reported crash data. The 18 schools were categorized by the school zone speed limit differentials: 35 to 25 mph, 40 to 25 mph, 30 to 25 mph, and 35 to …

Kytc Maintenance Field Operations Guide Supplement, Bryan Gibson, Candice Y. Wallace, Nancy Albright, Christopher W. Van Dyke, Steven Douglas Kreis

Kentucky Transportation Center Research Report

The Kentucky Transportation Cabinet (KYTC) is tasked with managing an asset portfolio that includes over 27,500 miles of roadway and 9,000 bridges. Keeping these assets in sound condition demands significant effort from KYTC’s Division of Maintenance, which includes activities ranging from mowing and litter pickup to cleaning out culverts and performing emergency roadway work. Despite the immense responsibilities shouldered by Maintenance personnel, until this project the Cabinet’s 12 districts lacked a systematic method for capturing and recording maintenance activities. Through a series of workshops held in each KYTC’s district with Section Engineer and Maintenance Supervisors, researchers at the Kentucky Transportation …

Crash Modification Factor Recommendation List, Reginald R. Souleyrette, Riana Tanzen, Eric R. Green, William Nicholas Staats, Federico Valentin Lause Iii

Kentucky Transportation Center Research Report

Practitioners use Crash Modification Factors/Functions (CMFs) to calculate the number of crashes expected once a countermeasure has been implemented. When evaluating design alternatives, CMFs can be used in conjunction with safety performance functions (SPFs) to derive crash predictions. The Federal Highway Administration (FHWA) maintains the CMF Clearinghouse as a repository for CMFs. Contributions are submitted by researchers across the U.S., Canada, and throughout the world. Typically, multiple CMFs are associated with a single countermeasure. Some CMFs only apply to specific facility or crash types. Furthermore, CMF quality varies, and some only apply to specific facility and/or crash types, regions, or …

A Multi-Objective Optimization Model To Minimize The Gap In Accessibility To Multi-Use Paths While Maximizing The Economic Efficiency Of Active Transportation Investments For Fresno, California, Chih-Hao Wang

Mineta Transportation Institute

This research examines the accessibility to multi-use paths in a variety of neighborhoods in Fresno, California. This study aims to develop a multi-objective optimization modeling framework to be used by decision makers in transportation and policy to maximize the total accessibility to multi-use paths across the city while minimizing the gap between low- and high- accessibility neighborhoods by an optimal allocation of active transportation. Researchers calculate accessibility to multi-use paths by measuring the total length of multi-use paths (walkway and bikeway) a resident could reach from their own Census block group with a 30-minute cycling ride. The study employs a …

The Fresno State Transportation Challenge, Christian Wandeler, Steven Hart

Mineta Transportation Institute

The goal of the “Fresno State Transportation Challenge” was outreach to schools and community engagement, to provide K-8 students opportunities to learn about transportation and transportation-related careers, and to practice 21st century skills by solving a transportation-related issue in their community. Through the pedagogical frameworks of action civics and eduScrum (a method to facilitate self-managed teamwork with a visual board), teachers and students worked on solving issues in their community. They learned design thinking to identify issues and develop solutions while using eduScrum to manage their work. University students from transportation engineering visited the schools regularly to support the K-8 …

Effective Communication Message Strategy For Enhancing Traffic Safety In Fresno County: The Role Of Time Horizon, Regulatory Focus, And Perceived Personal Control, Samer Sarofim

Mineta Transportation Institute

This research empirically investigated the differential effect of message framing on message recipients’ attitudes and intended behaviors related to pedestrian, cyclist, and motorist traffic safety practices. The framework empirically investigated time horizon (expansive vs. limited) and regulatory focus (prevention vs. promotion) message framing.

The time horizon in the message can make someone either think of the future (expansive) or the present (limited). For example, an expansive time horizon message communicates that life is long and directs the focus on the future. On the contrary, a limited time horizon message communicates that life is short and directs the focus on the …

Assessing Complete Street Strategies Using Microscopic Traffic Simulation Models, Bernice Liu, Alireza Shams, Jonathan Howard, Serena Alexander, Alex Hughes, Anurag Pande

Mineta Transportation Institute

Authors of this research developed a traffic simulation model for the downtown San Jose network and evaluated five different street redesign and travel demand combinations. This model aids understanding of network-wide effects of changes in street design for local and regional agencies who are interested in implementing complete streets and/or one-way to two-way conversion. The base network may be altered to model and evaluate other complete streets (e.g., road diet) and tactical urbanism (e.g., farmer’s market on city streets on certain days of the week) scenarios. The 3-dimensional animated videos for each scenario are also created to be used for …