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 166 for “"aero"”.
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Multidisciplinary Optimization of Next-Generation Aero-Engine Fans
… The role of sustainability in the modern aeronautics has gained a growing importance, and has been identified as a key challenge facing the aviation industry. Today, sustainability is one of the main agents pushing jet engine manufacturers towards the design of machines that consume less …
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Designing aero-acoustic wall openings for natural ventilation
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
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Aero-assisted orbital transfer vehicles utilizing atmosphere ingestion
… Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
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Sailing vessel dynamics : investigations into aero-hydrodynamic coupling
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Lead Time Reduction in the Aero Engine Overhaul Industry
… times of the strip to detail inspection of an aero engine overhaul facility. To achieve this, various methods were used. Initially dealing with the justification and construction of a simulation model followed by an examination of various scenarios to achieve the required reduction.<br/><br/>On …
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Post-combustion emissions control for aero-gas turbine engines
… and heavy-duty diesel engines, for use in aero-gas turbines.
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Advances in tunable diode laser spectroscopy for aero engine research
Tunable diode laser spectroscopy (TDLS) is a widely used technique for the measurement of gas species and offers in-situ operation, accuracy and faster response time compared to other optical and non-optical gas sensing techniques.The work in this thesis focusses on the measurement of CO2 in the …
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High-fidelity aero-structural optimization framework for transonic aircraft design
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Experimental aero-acoustic assessment of swirling flows for drag applications
… was implemented to experimentally assess the aerodynamic and aero-acoustic behavior of swirling flows. A modular design was chosen for the model-scale wind-tunnel test article based on a full-scale diameter of 1.2 m to allow for the wind-tunnel testing of different swirl angles, including both …
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Forced Response System Identification of Full Aero-Engine Rotordynamic Systems
… determining the rotordynamic damping in a full aero-engine remains challenging. This thesis presents a first-of-its-kind forced-response system identification approach to measuring rotordynamic damping of shaft modes in a full gas turbine aero-engine. A reduced-order modeling framework that …
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Near infrared tunable diode laser spectroscopy for aero engine related applications
… harsh detection environments, particularly for aero engine diagnostics, are considered. For stand-alone instrumentation, calibration-free direct absorption measurements are highly advantageous yet calibrated techniques employing wavelength modulation spectroscopy are often favoured due to their …
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Aero-thermal-mechanical interactions in ultra high-speed micro gas turbines
Aero-thermal induced mechanical response of engine components in an ultra high-speed micro gas turbine engine system is assessed. Scaling down gas turbine engines for high performance requirement dictates substantial thermal-induced effects on engine operation due to high temperature gradient …
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Aero-servo-viscoelasticity theory: lifting surfaces, plates, velocity transients, flutter, and instability
… formed the first foray into the field of aeroelasticity. Aeroelasticity is the intersection and interaction between aerodynamics, elasticity, and inertia or dynamics. Aeroelasticity is well suited for metal aircraft, but requires expansion to improve its applicability to composite …
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The effects of aero-propulsive coupling on aircraft with distributed propulsion systems
… Illinois at Urbana-Champaign to characterize the aeropropulsive coupling effects which are present for aircraft equipped with distributed electric propulsion (DEP) systems consisting of over-wing trailing-edge mounted (OWTE) arrays of ducted fans, and to identify the influence of those effects on …
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Mixed-fidelity CFD Simulations for Aero-engines: A Fan-intake Interaction Study
… system consists of complex components, where aerodynamics can be coupled. In these coupled problems, flow separation may exist and the multiscale turbulence needs to be finely resolved to obtain an accurate solution. A high-fidelity simulation in such scenarios, however, is still infeasible …
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Crack Path Predictions Under Mixed Mode Loading In Aero-Structures: Measurements and Analysis
<p>Ductile structural elements are often times subjected to complex loading conditions during normal operational conditions due to a combination of tension and torsion, resulting in mixed mode loading of flaws. When subjected to such conditions, the flaw is likely to undergo stable crack growth …
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Modelling Thermal Conductivity of Porous Thermal Barrier Coatings for High-Temperature Aero Engines
Thermal Barrier Coatings (TBC) are used to shield hot sections of gas turbine engines, helping to prevent the melting of metallic surfaces. TBC is a sophisticated layered system that can be divided into top coat, bond coat, and the super-alloy substrate. The highly heterogeneous microstructure of …
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Aero-propulsive characteristics of an overwing distributed electric propulsion system with vectored thrust
… to cover 70.3% of the airfoil model span. Aerodynamic forces and moments were recorded for the airfoil in a static condition, as well as across a range of Reynolds numbers, angles of attack, tip speed ratios, and nozzle deflection angles. It was found that nozzle deflection led to a …
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Performance optimization study of a Common Aero Vehicle using a Legendre Pseudospectral Method
… problem of performance optimization of a Common Aero Vehicle (CAV) is considered. In particular, the CAV is modeled as an unpowered high lift-to-drag ratio Earth penetrating re-entry vehicle. The CAV mission design problem is to determine a steering command that takes the CAV from a known initial …
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Interplanetary mission design with applications to guidance and optimal control of aero-assisted trajectories
<p>A method for finding optimal aerogravity-assist tours of the solar system is developed using indirect methods. Two cost functionals are used in the optimization; finding the minimum required maximum lift-to-drag ratio, with and without a convective heating-rate path constraint, and the path …
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