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 15 of 15 for “"Range and Endurance"”.
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Range and endurance modelling of a multi-engine aircraft with one engine inoperative (oei)
… in addition to the loss of engine thrust. The range and endurance of an aircraft are directly related to the quantity of the fuel available and the fuel consumption rate. This thesis was conducted to investigate range and endurance performance of a twin-engine jet aircraft of the Boeing 737 …
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State of the Art of Piloted Electric Airplanes, NASA's Centennial Challenge Data and Fundamental Design Implications
… must be derived in order to determine the endurance and range for electric airplanes since the standard equations depend upon weight change over a flight and the weight of an electric airplane does not change. These new equations could then be solved for the optimal velocity and altitude …
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An in-situ interdiffusion method for harvesting energy from an aluminum-water reaction
… tasks but are currently limited in their range and endurance by the energy density of their battery packs. Aluminum is an ideal energy source for AUVs because it exothermically reacts with water and is two orders of magnitude more energy dense than current lithium-ion batteries. An in-situ …
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Battery Centric Serial Hybrid Aircraft Performance and Design Space
<p>The design space and flight envelope of a battery centric serial hybrid aircraft has been analytically derived. The formulation assumes cruising flight only and all energy available is used. The flight envelope can be generated for any conventional propeller driven serial hybrid aircraft. The …
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Modeling of a Hybrid-Electric System and Design of Control Laws for Hybrid-Electric Urban Air Mobility Power Plants
… Air Mobility (AAM) is an emerging market and technology in the aerospace industry. These systems are being developed to overcome traffic congestion. The current designs make use of Distributed Electric Propulsion (DEP): either fully electric or hybrid electric. The hybrid engine system …
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Concept design of a long range AUV propulsion system with an onboard electrical generator
… in the past decade. Due to advances in batteries and telecommunications, unmanned underwater vehicles no longer require a tether to a mother ship for power, command and control. AUV endurance and range, however, are still limited by the size and capacity of the onboard batteries. Attempts to …
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The utilization and loss of available energy in aerospace systems
“Theoretical principles and analytical methodology for the control volume-based energy availability methodology for aerospace vehicles are developed; applications are made to jet-propelled and rocket-propelled vehicles as well as to stand-alone engine systems. Energy availability utilization …
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Modeling and Simulation of Autonomous Thermal Soaring with Horizon Simulation Framework
… energy from thermals to improve their range and endurance. Researchers had successfully flown UAVs autonomously with thermal soaring method. Most research involved some form of flight simulation. Improvements to the aircraft and thermal models for simulation purpose would enable …
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A Hydrodynamic Analysis and Conceptual Design Study for an External Storage Enclosure System for Unmanned Underwater Vehicles.
… (UUV) are limited in their scope of operations, range, and endurance by their relatively small energy storage capacity. The majority of commercially available medium-sized UUVs are incapable of mission operations with durations longer than 30 hours, many unable to achieve 24 hours. The complex …
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Aerodynamic Trade Study of Compound Helicopter Concepts
… profiles. For each concept, which included lift and/or propulsive compounding, a suite of aerodynamic performance models was developed using energy methods. In the case of a lift-compounded concept, an aerodynamic model representing the force interaction effects of the main rotor wake with the …
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An Integrated Platform to Increase the Range/Endurance of Unmanned Helicopters
… are becoming increasingly popular for a wide range of non-military applications such as, surveillance, reconnaissance, traffic monitoring, emergency response, agricultural spraying, and many other "eye in the sky" missions. However, an efficient landing/takeoff platform with …
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Scaling considerations for small aircraft engines
… the aerodynamic benefits of commoditized and distributed propulsion. Improvements in the performance of small engines have, however, prompted another look at this old concept. This thesis examines aspects of aircraft engines that may have application to commodity thrust or distributed …
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Conceptual Design and Optimization of a Tilt-Arm Hybrid Unmanned Aerial Vehicle
… hybrid unmanned aerial vehicle (UAV) concept and a computational framework to optimize and test its performance is developed. This UAV, called the Blended-wing-body Integrated Tilt-arm UAV or BITU, is capable of transitioning in-flight between VTOL, hover, and fixed-wing-like forward flight, …
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A Framework of a Power Management System for a Hybrid Electric VTOL Aircraft using Optimal Control
… of a hybrid fixed-wing vertical takeoff and landing unmanned aerial vehicle (VTOL UAV) is assessed using an optimal control framework for the most energy-efficient and time-efficient trajectories. The UAV is equipped with a modular hybrid propulsion system (MHPS) where the electrical and …
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Modeling and Control of Dual-Motored Tail-Sitting Flying Wing Using a Fuzzy Logic Pid Controller
… implementation of drones having begun and numerous companies competing to be among the original players in the market, there lies a large potential for novel drone designs to be created and flown. These novel designs are the ones that were largely ignored in the previous century due to …