Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"railway systems"”.
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Metrology Infrastructure for Energy and Power Quality in DC Railway Systems
L'abstract è presente nell'allegato / the abstract is in the attachment
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Analysis of capacity pricing and allocation mechanisms in shared railway systems
… by different train operating companies (shared railway system) has been proposed as a way to improve infrastructure utilization and to increase efficiency in the railway industry. Shared use requires coordination between the infrastructure manager and multiple train operators. Such coordination …
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Predictive Maintenance in Rail Transportation: An Explainable Machine Learning Approach
Railway systems are integral to sustainable urban mobility, yet their reliability depends on effective maintenance strategies that prevent costly disruptions and safety hazards. Traditional fixed-interval maintenance approaches, although widely adopted, are inefficient and fail to capitalise on the …
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Combinatorial and Robust Optimisation Models and Algorithms for Railway Applications
… and robust optimisation models to solve railway problems. Railway applications represent a challenging area for operations research. In fact, most problems in this context can be modelled as combinatorial optimisation problems, in which the number of feasible solutions is finite. Yet, …
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State of the Art Roller Rig for Precise Evaluation of Wheel-Rail Contact Mechanics and Dynamics
… obtaining data on the mechanics and dynamics of railway systems for a variety of operating conditions. The idea to develop a laboratory test rig started from the observation that there is a need for better-developed testing fixtures capable of accurately explaining the complex physics of …
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A lean enterprise approach for developing high speed rail in Japan and Portugal
… the expansion and development of the high speed railway industry in Japan. The basic idea of the lean enterprise is increasing value-added processes, eliminating waste, and creating equitable value delivery throughout the enterprise. It also focuses on both radical change and continuous …
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Revenue Management in the railway industry in Japan and Portugal : a stakeholder approach
… thesis deals with the application of RM to the railway industry. The railway is considered the most energy-efficient mode of transportation, and its role has become increasingly important around the world with ever growing concerns about the global energy crisis and climate change. Implementing …
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Assuring safety in high-speed magnetically levitated (maglev) systems : the need for a system safety approach
Magnetic levitation is a railway technology that enables vehicles to be magnetically suspended above their tracks. Although this technology is still under development, magnetically levitated (maglev) systems have great potential to introduce significant changes in today's transportation networks. …
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Reliability allocation and apportionment: addressing redundancy and life-cycle cost
… here for both. As designs of aircraft, railway systems, automobiles and space systems continue to push the envelope in terms of their capabilities, the importance of performance criteria such as reliability and associated life-cycle cost (LCC) consequences become even more important. …
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Design and control of resilient interconnected microgrids for reliable mass transit systems
Mass transit systems are relied on a daily basis to transport millions of passengers and bring billions of dollars' worth of economic goods to market. While some forms of mass transit rely on a fuel, electrified railway systems are dependent on the electric grid. The electric grid is becoming more …
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Re-Envisioning Electric Railway Power Systems in Dense Urban Regions
… <p> This dissertation re-envisions electric railway systems as major sustainability and resiliency energy hubs in dense urban regions. Specifically, we propose and prove that the power systems of a railway network can provide an excellent medium to integrate renewable energy systems, electric …
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Optimising AC electric railway power flows with power electronic control
… to the individual equipment. In this thesis, AC railway power flows are optimised in real time and the results are used to achieve some particular system objective via control of the PWM equipment as mobile reactive power compensators. The system voltage profile and the total power losses can be …
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An Assessment of Household Purchasing Decisions in Kasulu Urban and Kasulu Rural Areas'
… has poor infrastructure especially roads and railway systems. Thus the distributive system for a range of products is still inefficient. This has been a disincentive to the growth of retail business. The time allocated for the research work was inadequate. Due to this limitation, the …
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Investigating the feasibility of using dynamic stiffness beam functions in a hybrid structure-borne noise prediction model
… noise in buildings associated with nearby railway systems, either above ground or underground, is a common occurrence indensely populated areas. This is especially true where new transportation systems are built in proximity to existing noise and vibration sensitive buildings, and …
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Condition assessment methods for prestressed concrete railway sleepers: feasibility for South African applications
Concrete sleepers are a key component of railway systems, with estimates showing between 20 million to 35 million currently installed within the South African railway network. The condition assessment of concrete sleepers in South Africa poses a challenge for two main reasons: the scale at which …
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Condition assessment methods for prestressed concrete railway sleepers: feasibility for South African applications
Concrete sleepers are a key component of railway systems, with estimates showing between 20 million to 35 million currently installed within the South African railway network. The condition assessment of concrete sleepers in South Africa poses a challenge for two main reasons: the scale at which …
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Cable train : a platform for in-situ manufacturing of underground cable
… High Voltage Direct Current (HVDC) transmission systems offer efficiency and cost effectiveness over long distances, allow for the linkage of incompatible AC grids, and can be immune to telluric currents and aggressive EMP attacks, which all make these systems particularly applicable to …
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Analysis and comparison of the South African and Eurocode live load models for railway bridges
… (SATS) and Eurocode (EC) live load models for railway bridges. The study is specifically concerned with the critical load effects of shear and bending moment. The load models are simulated as moving loads over the full length of simply supported and continuous railway systems with speeds not …
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Proposed Karachi-Rasht railway system (KRR) and its impacts on the development of Afghanistan, Iran and Pakistan
… impacts of a proposed international railway system. The proposed railway extends an approximate length of 2000 miles from Karachi on the Persian Gulf, through Pakistan, Iran, and Afghanistan (the PIA Region), to Rasht on the Caspian Sea. The proposed link, named the Karachi—Rasht …
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Hybrid Modular Multilevel Converter Family and Modular DC Circuit Breaker for Medium-voltage DC (MVDC) Applications
… techniques, DC grids, and distribution systems have gained significant interest. These systems offer advantages such as improved power quality, efficiency, and flexibility. Medium-voltage DC (MVDC) applications, including shipboard, railway systems, distribution networks, and microgrids, …
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