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 87 for “"aircrafts"”.
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Design of Extreme Efficiency Active Rectifier for More-electric Aircrafts
… fuel economy and reduce environmental impact of aircrafts. The fundamental of the concept is to replace pneumatic, hydraulic and mechanical systems in conventional aircrafts with its electrical equivalent that is lighter and more reliable. In this movement, power electronics technology plays a …
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Experimental and numerical investigation of the dynamic seat comfort in aircrafts.
… research focuses on the dynamic seat comfort in aircrafts specifically during takeoff, landing and cruise through turbulence flight conditions. The experiments are performed using a multi axis shaker table in the Automotive Centre of Excellence (ACE) at the University of Ontario Institute of …
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Fuzzy Optimal Swarm of Autonomous Aircrafts for Target Determination and Convergence Control System
<p>The thesis project proposes analytical and theoretical algorithms for a networked swarm of autonomous vehicles, such as those used in planet exploration, and to be used in target location determination and convergence, an algorithm of this type could be used in an Autonomous Stratospheric …
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Small-Signal Modeling and Stability Specification of a Hybrid Propulsion System for Aircrafts
This work utilizes the small-signal impedance-based stability analysis method to develop stability assessment criteria for a single-aisle turboelectric aircraft with aft boundary-layer propulsion (STARC-ABL) system. The impedance-based stability analysis method outperforms other stability analysis …
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Compact Electromechanical Actuators for Urban Air Mobility: Development of a Framework for Design, Digital Twin and PHM Integration in eVTOL Aircrafts
L'abstract è presente nell'allegato / the abstract is in the attachment
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Innocent Passage of Warcraft in Territorial Seas from a Historic Perspective
… only with warships but also with submarines and aircrafts.
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Design of and Experimentation with an Insect Impact Simulator Setup
Laminar flow aircrafts as a potential super speed and economical fuel saver airplanes are being lagged from commercialization by contaminations on the wings. These contaminations such as sand/dust, ice, and insect residual have been studied for a long time. Insect residual unlike the other two need …
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Mathematical Methods for the Approximation of Radar Traces
… airports collect recordings of the position of aircrafts at specific times. Those data typically requires extensive smoothing and corrections before it can be used for later analysis. Conventional smoothing approaches fail to model the movement physically correct, i.e. do not take standstills of …
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Towards MAV Autonomous Flight: A Modeling and Control Approach
… and subsequently applied to commercial aircrafts: the DraganFlyer and the Hummingbird quadrotors, which have been hardware-modified in order to perform experimental autonomous flying. Furthermore, a first-ever approach for modeling commercial micro coaxial mechanism is presented using a …
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Optimization Models and Approximate Algorithms for the Aerial Refueling Scheduling and Rescheduling Problems
… the refueling completion times for fighter aircrafts (jobs) on multiple tankers (machines) to minimize the total weighted tardiness. ARSP can be modeled as a parallel machine scheduling with release times and due date-to-deadline window. ARSP assumes that the jobs have different release …
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Applications for paper honeycomb technology
… construction, marketing promotions, cars, aircrafts, and lately, in furniture. This thesis focuses specifically on new market opportunities for the paper honeycomb technology, especially its use in furniture. I test different hypotheses on both the demand side and the supply side of the …
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A Petri Net framework for the representation and analysis of aircraft turnaround operations
… of narrow-bodied B738 and wide-bodied A333 aircrafts.
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Analysis of various forced oscillation techniques for obtaining dynamic stability derivatives
… for obtaining dynamic stability derivatives for aircrafts at high angle of attack are described. From the general equations of motion of an aircraft in space, the perturbation equations of motion are derived for applying to a wind tunnel aircraft model. Data Reduction and test procedures for …
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Optimizing neural networks for enhancing air traffic security
… to ensure adequate distances between adjacent aircrafts in the air and, if necessary, to create early warning alarms to alert air traffic control tower personnel about planes that may pass too near each other in the immediate future. The thesis covers three areas of work on this topic. The …
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Dynamic simulation of 3D weaving process
… in high performance products, such as aircrafts frames, aircrafts engine blades, ballistic panels, helmets, aerospace components, racing car bodies, net-shape joints and blood vessels. Fabric mechanical properties are determined by fabric internal architectures and fabric …
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Experimental and Computational Analysis of a 3D Printed Wing Structure
… part in designing flutter or divergence free aircrafts within a designated flight envelope. The aeroelastic analysis includes specifically tailoring the design in order to prevent flutter (passive control) or eliminate it by applying input on control surfaces (active control). High-fidelity …
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Application of Computational Fluid Dynamics as a Simulation-based Design Guide in a Microfluidic 3D Living Cell Array (3D LCA) Device
… a reinforcement to efficiency in the design of aircrafts or for understanding the flow through pipes. A similar approach can be taken towards microfluidics, where traditionally devices have been designed based on experience or physiological replication, and a CFD simulation is shown …
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Monte Carlo simulations of the iThemba LABS neutron beam facility
… detectors used for dose monitoring in space and aircrafts, and the development of neutron dose monitors. Neutron beams with energies up to 200 MeV are produced at iThemba LABS by irradiating thin targets of 7Li and 9Be with protons from the separated-sector cyclotron. The neutrons are collimated …
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The Triple Scissor Extender Robot Arm : solving the last one foot problem in robotic manipulation
Final assembly, inspection, and maintenance of aircrafts, automobiles, and industrial equipment often requires a robot to reach confined areas that are difficult to access. While a robot can move freely in open space, the last one foot to a target site in a manufacturing environment is often …
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