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Articles 1921 - 1950 of 5924

Full-Text Articles in Civil and Environmental Engineering

Investigating The Contact-Point Response For Drive-By Damage Detection In Bridges, Robert Corbally, Abdollah Malekjafarian Aug 2020

Investigating The Contact-Point Response For Drive-By Damage Detection In Bridges, Robert Corbally, Abdollah Malekjafarian

Civil Engineering Research in Ireland 2020

Bridges are critical elements in any road or rail transport network and ensuring their safety is paramount. Recent years have seen significant research efforts to develop cost-effective techniques for bridge monitoring on a large scale. Drive-by bridge inspection techniques, whereby sensors inside a vehicle are used to monitor bridge condition, are at the focus of much of this work. This paper develops a relationship between the measured response in a vehicle and the contact-point response between the wheel and the surface of a bridge using a quarter-car representation of the vehicle. Numerical simulations are carried out to examine the feasibility …

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Application Of The Iec Technical Specification For Assessment Of Wave Energy Resource: A Case Study From The West Coast Of Ireland, Iulia Anton, Stephen Nash Aug 2020

Application Of The Iec Technical Specification For Assessment Of Wave Energy Resource: A Case Study From The West Coast Of Ireland, Iulia Anton, Stephen Nash

Civil Engineering Research in Ireland 2020

There is significant interest globally in harnessing our ocean wave energy resource, estimated at approximately 30,000 TWh/year. The key to this is understanding the resource. The International Electrotechnical Commission (IEC) has developed a technical specification for the evaluation of wave energy resource, IEC-TS 62600- 101: Wave energy resource assessment and characterization. This research applies the IEC standard for a resource characterization study of the Atlantic Marine Energy Test Site on the west coast of Ireland. A key focus is the comparison of the detailed IEC validation approach using scatter diagrams with the traditional timeseries validation approach. Coarse (0.005°) and fine …

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Wind Power Prediction And Early Downtime Detection For Ireland, Vikram Pakrashi, Basuraj Bhowmik, Juan Manuel González-Sopeña, Paul Mucchielli, Bidisha Ghosh Aug 2020

Wind Power Prediction And Early Downtime Detection For Ireland, Vikram Pakrashi, Basuraj Bhowmik, Juan Manuel González-Sopeña, Paul Mucchielli, Bidisha Ghosh

Civil Engineering Research in Ireland 2020

Wind energy must be commercially competitive to be economically sustainable. Existing wind farms in Ireland must be more efficient to meet the 2009 EU Renewable Energy Directive target of 7% of total energy demand from onshore wind energy farms, which is 45% of the total national renewable energy target of 16%. WindPearl - a Sustainable EnergyAuthority of Ireland (SEAI) funded project is currently looking into improvin operations & maintenance (O&M) of onshore wind turbine farms in Ireland.

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An Experimental Investigation Of The Optimum Properties And Conditions For Use Of Anionic Emulsions In Road Maintenance Applications, Simonas Ignatavicius, Alan Kavanagh, David Colleran, Michael J. Brennan, Shane Newell Aug 2020

An Experimental Investigation Of The Optimum Properties And Conditions For Use Of Anionic Emulsions In Road Maintenance Applications, Simonas Ignatavicius, Alan Kavanagh, David Colleran, Michael J. Brennan, Shane Newell

Civil Engineering Research in Ireland 2020

Bitumen emulsions are used for a range of road maintenance applications, including surface dressing, gravel seals, slurry seals, tack coating, cold-mix asphalt and in situ pavement recycling. The emulsions used can be classified as being either cationic (i.e. possessing a positive electrostatic surface charge) or anionic (i.e. carrying a negative electrostatic surface charge). The vast majority of emulsions used for such applications in Europe are cationic, while anionic bitumen emulsions are used widely throughout North America and Africa. The aims of the experimental study described in this paper were (a) to investigate why one or the other emulsion type is …

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A Review Of Vision Based Methods For Pothole Detection And Road Profile Analysis, Darragh Lydon, Su Taylor, Myra Lydon, Julia Early Aug 2020

A Review Of Vision Based Methods For Pothole Detection And Road Profile Analysis, Darragh Lydon, Su Taylor, Myra Lydon, Julia Early

Civil Engineering Research in Ireland 2020

This paper is an overview of the development and application of Computer Vision for the detection of pothole, pavement distress and road profile analysis and categorisation. A brief explanation of the traditional methods for determining these factors is given, followed by a chronological description of the evolution and the challenges of using Computer Vision (CV) approaches to determine these conditions. The paper is separated into sections aligned to image capture and analysis methodologies. Qualitative evaluations and comparison of these methods have been provided along with the proposal of guidelines for new computer vision-based road analysis systems.

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Analysis And Optimisation Of Tii’S Pams Reset Values And Deterioration Models For Irish Pavement Conditions, James Quinn, Raymond Mcgowan, Tomas O'Flaherty Aug 2020

Analysis And Optimisation Of Tii’S Pams Reset Values And Deterioration Models For Irish Pavement Conditions, James Quinn, Raymond Mcgowan, Tomas O'Flaherty

Civil Engineering Research in Ireland 2020

Ireland has a national road network of approximately 5300km that is managed by Transport Infrastructure Ireland (TII). TII create yearly pavement maintenance and renewal programs from the operation of a Pavement Asset Management System (PAMS). Accurate pavement deterioration models and reset values are an essential part of PAMS and are required for life cycle cost analysis (LCCA). Pavement maintenance and renewal schemes are prioritised based on the LCCA's largest benefit to cost ratio, and therefore optimise the annual pavement maintenance and renewal budget. Currently, TII implement pavement deterioration models and reset values from Austria's and Belgium's PAMS, and are not …

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An Analysis Of The Effectiveness Of Bitumen Additives On The Performance Of Pavement Surface Dressings, Alan Anderson, John Casserly, Alan Kavanagh, Jim Campbell Aug 2020

An Analysis Of The Effectiveness Of Bitumen Additives On The Performance Of Pavement Surface Dressings, Alan Anderson, John Casserly, Alan Kavanagh, Jim Campbell

Civil Engineering Research in Ireland 2020

Surface dressing is a maintenance technique that uses thin layers of bitumen emulsion and single sized aggregates. The surface dressing process seals and binds the surface of a road to protect its substructure from water ingress. It also provides increased skid resistance, which improves safety for road users. Early life chip-loss can occur if there is an insufficient degree of adhesion between the emulsion and aggregate used. The range of additives used in bitumen can have an effect on their adhesion properties. The focus of this research project was to investigate if the use of these additives in surface dressing …

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Winter Maintenance On The Irish Road Network, Hugh Mcconnell, Brian Mccann Aug 2020

Winter Maintenance On The Irish Road Network, Hugh Mcconnell, Brian Mccann

Civil Engineering Research in Ireland 2020

Winter maintenance relates to those activities undertaken where the objective is to minimise the impact of frost, ice or snow on the travelling public. The responsibility for winter maintenance of all roads in Ireland currently rests with local authorities and Transport Infrastructure Ireland (TII) (Formerly the NRA) on behalf of the Department of Transport, Tourism and Sport (DTTaS), (DTTaS, 2017). The aim of the study was to examine current winter maintenance practices undertaken in Ireland by local authorities and the Motorway Maintenance and Renewals Contracts (MMaRC) contractors and examine the potential financial, operational and environmental benefits if pre-wet and brine …

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An Experimental Investigation Of The Optimum Properties And Conditions For Use Of Anionic Emulsions In Road Maintenance Applications, Simonas Ignatavicius, Alan Kavanagh, David Colleran, Michael J. Brennan, Shane Newell Aug 2020

An Experimental Investigation Of The Optimum Properties And Conditions For Use Of Anionic Emulsions In Road Maintenance Applications, Simonas Ignatavicius, Alan Kavanagh, David Colleran, Michael J. Brennan, Shane Newell

Civil Engineering Research in Ireland 2020

Bitumen emulsions are used for a range of road maintenance applications, including surface dressing, gravel seals, slurry seals, tack coating, cold-mix asphalt and in situ pavement recycling. The emulsions used can be classified as being either cationic (i.e. possessing a positive electrostatic surface charge) or anionic (i.e. carrying a negative electrostatic surface charge). The vast majority of emulsions used for such applications in Europe are cationic, while anionic bitumen emulsions are used widely throughout North America and Africa. The aims of the experimental study described in this paper were (a) to investigate why one or the other emulsion type is …

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A Review Of Vision Based Methods For Pothole Detection And Road Profile Analysis, Darragh Lydon, S. E. Taylor, Myra Lydon, Julia Early Aug 2020

A Review Of Vision Based Methods For Pothole Detection And Road Profile Analysis, Darragh Lydon, S. E. Taylor, Myra Lydon, Julia Early

Civil Engineering Research in Ireland 2020

This paper is an overview of the development and application of Computer Vision for the detection of pothole, pavement distress and road profile analysis and categorisation. A brief explanation of the traditional methods for determining these factors is given, followed by a chronological description of the evolution and the challenges of using Computer Vision (CV) approaches to determine these conditions. The paper is separated into sections aligned to image capture and analysis methodologies. Qualitative evaluations and comparison of these methods have been provided along with the proposal of guidelines for new computer vision-based road analysis systems.

Go to article

Analysis And Optimisation Of Tii’S Pams Reset Values And Deterioration Models For Irish Pavement Conditions, James Quinn, Raymond Mcgowan, Tomas O'Flaherty Aug 2020

Analysis And Optimisation Of Tii’S Pams Reset Values And Deterioration Models For Irish Pavement Conditions, James Quinn, Raymond Mcgowan, Tomas O'Flaherty

Civil Engineering Research in Ireland 2020

Ireland has a national road network of approximately 5300km that is managed by Transport Infrastructure Ireland (TII). TII create yearly pavement maintenance and renewal programs from the operation of a Pavement Asset Management System (PAMS). Accurate pavement deterioration models and reset values are an essential part of PAMS and are required for life cycle cost analysis (LCCA). Pavement maintenance and renewal schemes are prioritised based on the LCCA's largest benefit to cost ratio, and therefore optimise the annual pavement maintenance and renewal budget. Currently, TII implement pavement deterioration models and reset values from Austria's and Belgium's PAMS, and are not …

Go to article

An Analysis Of The Effectiveness Of Bitumen Additives On The Performance Of Pavement Surface Dressings, Alan Anderson, John Casserly, Alan Kavanagh, Jim Campbell Aug 2020

An Analysis Of The Effectiveness Of Bitumen Additives On The Performance Of Pavement Surface Dressings, Alan Anderson, John Casserly, Alan Kavanagh, Jim Campbell

Civil Engineering Research in Ireland 2020

Surface dressing is a maintenance technique that uses thin layers of bitumen emulsion and single sized aggregates. The surface dressing process seals and binds the surface of a road to protect its substructure from water ingress. It also provides increased skid resistance, which improves safety for road users. Early life chip-loss can occur if there is an insufficient degree of adhesion between the emulsion and aggregate used. The range of additives used in bitumen can have an effect on their adhesion properties. The focus of this research project was to investigate if the use of these additives in surface dressing …

Go to article

Winter Maintenance On The Irish Road Network, Hugh Mcconnell, Brian Mccann Aug 2020

Winter Maintenance On The Irish Road Network, Hugh Mcconnell, Brian Mccann

Civil Engineering Research in Ireland 2020

Winter maintenance relates to those activities undertaken where the objective is to minimise the impact of frost, ice or snow on the travelling public. The responsibility for winter maintenance of all roads in Ireland currently rests with local authorities and Transport Infrastructure Ireland (TII) (Formerly the NRA) on behalf of the Department of Transport, Tourism and Sport (DTTaS), (DTTaS, 2017). The aim of the study was to examine current winter maintenance practices undertaken in Ireland by local authorities and the Motorway Maintenance and Renewals Contracts (MMaRC) contractors and examine the potential financial, operational and environmental benefits if pre-wet and brine …

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On The Localized Settlement Of Geodetic Networks And Points For The Monitoring Of The Migration Of Landslides, B.R. Nazarov, H.T. Kayumova, R.X. Mukarramov Aug 2020

On The Localized Settlement Of Geodetic Networks And Points For The Monitoring Of The Migration Of Landslides, B.R. Nazarov, H.T. Kayumova, R.X. Mukarramov

Journal of Tashkent Institute of Railway Engineers

The article is devoted to the formation of on-site geodetic network points to prevent geological processes such as landslides or large deformations, and provides methodology for establishing network points to continuously monitor the movement of avalanche sites. In addition, the methodology for the creation of geodetic network points at impassable distances are described.

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Research Of Porosity Of A Cement Stone With A Zeolite Containing Filler And A Superplasticstificator, Anvar Ishanovich Adilhodzhaev, I.A. Kadyrov, K.S. Umarov Aug 2020

Research Of Porosity Of A Cement Stone With A Zeolite Containing Filler And A Superplasticstificator, Anvar Ishanovich Adilhodzhaev, I.A. Kadyrov, K.S. Umarov

Journal of Tashkent Institute of Railway Engineers

The question of the influence of the zeolite-containing filler of the Beltau deposit and the polycarboxylate superplasticizer on the formation of porosity of cement stone is considered. The results of experiments to establish the effect of a zeolite-containing filler and a plasticizing additive on pore size distribution are graphically presented. The data obtained confirm the advisability of using this type of filler in concrete.

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Features Of Laboratory Testing Methods Of Clayey Soils, A. Zhussupbekov, A. Tulebekova, U. Abduraimov Aug 2020

Features Of Laboratory Testing Methods Of Clayey Soils, A. Zhussupbekov, A. Tulebekova, U. Abduraimov

Journal of Tashkent Institute of Railway Engineers

The article compares the results of laboratory tests of dispersed soils to determine their strength characteristics. For this purpose, soils were tested on devices with three-axis compression and single-plane cut. In calculations for clay and sandy soils, indicators of their strength properties are used, which include such characteristics as the angle of internal friction φ and specific adhesion c. Based on the results of this work, recommendations on the practical application of the obtained soil characteristics for the geo-information geotechnical database of Astana were compiled.

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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 Aug 2020

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 …

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On Design Features And Improvements Freight Wagon Braking Systems, U.Sh. Israilov Aug 2020

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.

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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 Aug 2020

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.

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Forecast Efficiency Of Application Of Electronic Documents In Cargo And Commercial Works On Railway Transport, N.M. Aripov, Sh.Sh. Kamaletdinov Aug 2020

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.

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Increasing The Train Safety Level Based On A Process Approach, A.Kh. Makhkamov, M.Sh. Valiev Aug 2020

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.

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Modernization Of The Crate Suspension Unit Of The Vl-80s Electric Carrier, G.А. Khromova, D.O. Radjibaev, S.A. Khromov, I.C. Kamalov Aug 2020

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.

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Research Of Development Prospects Of Transportation Hub In Jsc "Umc", Marufdjan Xalikovich Rasulov, Sh.M. Suyunbayev, M.N. Masharipov Aug 2020

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 …

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Application Of Fiber-Optic Communication Line Under Control And Monitoring Of Track Relays In Station Rail Circuits, Q.K Nuriddinov, Z.I. Mamedova Aug 2020

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

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Transfer Function Of A Traction Induction Motor Controlled By A Four-Quadrant Converter, As A Link Functional Diagnostics, M.C. Yakubov, Zh.S. Fayzullaev Aug 2020

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.

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Dynamic Characteristics Of The New Three-Phase Current Unbalance Transformer Converter, Sultan Fayzullayevich Amirov, S.X. Zhumaboyev, N.R. Yuldashev Aug 2020

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.

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Automatic Locomotive Signaling Parameters Devices On The Basis Of Microprocessor Elements, B.B Raxmonov, J.F. Kurbanov, J.E. Xidirov Aug 2020

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 …

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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 Aug 2020

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 …

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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 Aug 2020

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.

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Determining The Correction Factor For A Current Transformer With Automatic Range Control, Sultan Fayzullayevich Amirov, Sh.S. Mukhsimov, O.T. Boltayev, S.Kh. Zhumaboyev Aug 2020

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 …

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