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.
Results
Showing 1 to 20 of 57 for “"Fuel savings"”.
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Aircraft cruise performance optimization using chattering controls
… by using energy-state modelling to investigate fuel-range optimal trajectories. Chattering controls are considered appropriate when the hodograph is non-convex. Classical steady-state cruise, simple chattering-cruise and the extended chattering-cruise models are studied as constrained …
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Development of a Multi-Disciplinary Design Optimization Framework for a Strut-Braced Wing Transport Aircraft in PACELAB APD 3.1
… APD versions were used to perform minimum-fuel optimizations for both a traditional cantilever and strut-braced wing aircraft for a medium-range regional transport mission similar to that of a 737-type aircraft, with a minimum range of 3,115 nm and a cruise Mach number of 0.78. The …
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Big data fusion to estimate driving adoption behavior and urban fuel consumption
… uses the resulting travel demand and computes fuel consumption. The model is calibrated for application on any range of car fuel efficiency and combined with other sources of data to produce urban fuel consumption estimates for the city of Riyadh as an application. Targeted traffic congestion …
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A cost estimation analysis of U.S. Navy fuel-saving techniques and technologies
… efficiencies gained could yield substantial fuel savings. This thesis follows a process of researching and collecting fuel-saving ideas, developing a method to estimate savings, subjecting calculations to sensitivity analyses by discount factor and cost of fuel, and creating prioritization …
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Improvements to The Global Oceanic Model and Performance Assessment of The North Atlantic Organized Track System
… of the flight cost matrix provides average fuel savings of 93 kilograms per flight using 2020 traffic. The fuel savings increase to 170 kilograms per flight using traffic levels expected in the year 2040. A new operational track assignment routine is developed and it could save around 40 …
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Evaluation of power-assist hydraulic and electric hybrids for medium- and heavy-duty vehicle applications
Under pressure from rising fuel costs, emissions constraints, and new government regulations on medium- and heavy-duty vehicles, hybrid technologies for these classes of vehicles are becoming more prevalent. A variety of technologies have been proposed to meet these requirements including …
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Energy Resiliency: How DoD can become Energy Resilient and Still Meet its Renewable Energy Goals
… the benefits of onsite production of energy and fuel savings associated with renewable energy; and make investments in new micro-grid technologies that can decouple the DoD from the aging commercial grid and that may encourage third-party energy partnerships.
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Fuel-conserving environmental control strategies for small Islanded microgrids
… of the ECU load can result in considerable fuel savings. I also developed a detailed simulation environment to simulate the operation of the FOB under a variety of operating conditions, and used it to investigate other potential solutions for the efficiency problems caused by ECUs. Finally, …
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Behavioral responses and policy evaluation: Revisiting water and fuel policies
… affecting water depletion, water pollution, and fuel consumption. I assess their cost-effectiveness by modeling and quantifying the behavioral responses of farmers and households.</p> <p>My first essay focuses on decreasing groundwater depletion through increasing irrigation efficiency in Mexico. …
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COST-BENEFIT ANALYSIS OF CONVERTING WASP CLASS LANDING HELICOPTER DOCK (LHD) STEAM PROPULSION PLANTS TO HYBRID PROPULSION
… present value of conversion by weighing the cost-savings benefits of fuel savings, in-port utility consumption, and manpower against the cost of conversion. The results of the analysis conclude that LHDs 5 and 7 have a positive net present value; therefore, their conversion is recommended. LHD 6 …
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Distributed Control and Information Exchange for Improved Flight Autonomy of Hybrid Powertrain Drones
… with hybrid powertrains. The goal is to maximize fuel savings and achieve that through powertrain regulation. One of factors that influence optimal internal combustion engine (ICE) operation is the passively managed battery, which should have the role of a fast supplementary power source. When the …
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Cars on a diet : the material and energy impacts of passenger vehicle weight reduction in the U.S.
… concerns about greenhouse gas emissions and fuel use by passenger vehicles. We find that every 10% reduction in vehicle weight can cut fuel consumption by about 7%. In the U.S., vehicle weight reduction is essential for meeting future, more stringent fuel economy standards. New vehicles are …
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The effects of driving style and vehicle performance on the real-world fuel consumption of U.S. light-duty vehicles
… both conservation and methods for reducing the fuel consumption of existing vehicles are needed to decrease the petroleum consumption and greenhouse gas emissions of the U.S. light-duty vehicle fleet. One way to do this is through changes in driving style, specifically through reductions in …
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Using polymer electrolyte membrane fuel cells in a hybrid surface ship propulsion plant to increase fuel efficiency
… to lower the amount of money spent purchasing fuel. Operational restrictions limiting fuel use are temporary and cannot be dependably relied upon. Long term technical research toward improving fuel efficiency is ongoing and includes advanced gas turbines and integrated electric propulsion …
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Dynamic Connected Automated Vehicle Trajectory and Traffic Signal Timing Optimization
… signal switching times to minimize vehicle fuel consumption through a computationally efficient A* minimum path algorithm within a dynamic programming procedure. This system explicitly minimizes vehicle fuel consumption while ensuring vehicle safety by preventing red light violations, hard …
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The practicality of adaptable geometry centrifugal pumps in U.S. Navy systems
… system performance, resulting in an annual fuel savings of nearly 10,000 gallons per ship. Although the DDG firemain is used as the primary example throughout the thesis, the review of pump improvement methods could be applied to many Navy, military, or civilian pumping systems. …
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Technological assessment and evaluation of high power batteries and their commercial values
… lead to better a vehicle performances, reduced fuel consumption and emissions. In this thesis, we quantify the fuel savings benefits from HEV, and the marginal value of each W/kg improvement in this battery technology. From the analysis, we conclude that the marginal value of regenerative …
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Feasibility of Circular Orbits for Proximity Operations in Strongly Perturbed Environments around Uniformly Rotating Asteroids
… were the focus of this research and significant fuel savings of up to 40% toward the elongated asteroids’ surfaces and 90% toward the spherical asteroids surface.</p>
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Feasibility Analysis and Fuel Burn Benefits of Relaxing Constraints in High Altitude Cruise
Operational interventions, such as enabling more fuel-efficient trajectories, are desirable in mitigating the environmental impact of air travel due to their relatively fast implementation potential. In particular, the vertical inefficiency arising from the altitude stratification in the airspace …
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Preliminary development and flight trials of a cruise altitude and speed optimization decision support tool
… vertical trajectory planning in order to reduce fuel and time costs. As the optimal altitude for an aircraft changes with speed, weight, outside air temperature, and winds, flight crew decision-making can benefit from the calculation and display of the relative flight costs of possible …
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