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 135 for “"airframe"”.
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A Financial Analysis of the Airframe-Turned Aerospace Industry
Made available in DSpace on 2014-12-10T16:44:47Z (GMT). No. of bitstreams: 1 7000977.pdf: 6772134 bytes, checksum: 7ad7b5bb879a1f3f28eb9d935118b7bd (MD5) Previous issue date: 1969
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Novel turbomachinery concepts for highly integrated airframe/propulsion systems
… to advanced flight missions requiring integrated airframe/propulsion systems. The first concept is motivated by thermal management challenges in low-to-high Mach number (4+) aircraft. The idea of compressor cooling combines the compressor and heat exchanger function to stretch turbopropulsion …
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Investigation of alternative rotorcraft powerplant configurations for improving airframe performance
… were analyzed to determine their improvements to airframe performance capabilities, with the main goal of increasing an aircraft's range. The helicopter's engine was the focus of this thesis, with emphasis on improving its specific power (power vs weight ratio), efficiency, performance in high …
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Clean Wing Airframe Noise Modeling for Multidisciplinary Design and Optimization
… of different design variables on the clean wing airframe noise such as the aircraft speed, lift coefficient, and wing geometry. It can also capture three-dimensional effects which become important at high lift coefficients, since the characteristic velocity and the length scales are allowed to …
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Robust Image-Based Visual Servo Control of an Uncertain Missile Airframe
<p>A nonlinear vision-based guidance law is presented for a missile-target scenario in the presence of model uncertainty and unknown target evasive maneuvers. To ease the readability of this thesis, detailed explanations of any relevant mathematical tools are provided, including stability …
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Novel Airframe Design for the Dual-Aircraft Atmospheric Platform Flight Concept
… high-altitude, long-endurance unmanned aerial airframe was designed for the innovative Dual-Aircraft Atmospheric Platform flight concept that exploits stratospheric wind velocity gradients to remain aloft indefinitely. Classical aircraft preliminary design techniques and high-fidelity tools …
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An Investigation of Classical Panel Stiffener Buckling Methods for Modern Airframe Applications
<p>Classical methods for buckling assessment of aircraft panels reinforced by bulb-stiffened flanges differ regarding symmetric versus asymmetric cross-sections. The present research addresses a number of classical derivations of methods with a focus on the work of Dwight Windenburg as published in …
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A Three Dimensional Vortex Particle-Panel Code for Modeling Propeller-Airframe Interaction
Analysis of the aerodynamic effects of a propeller flowfield on bodies downstream of the propeller is a complex task. These interaction effects can have serious repercussions for many aspects of the vehicle, including drag changes resulting in larger power requirements, stability changes resulting …
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An implicit algorithm for analysis of an airframe-integrated scramjet propulsion cycle
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Rotor-Airframe Interaction Noise: Predicting and Mitigating Noise with Artificial Neural Networks
… installation effect known as the rotor-airframe interaction noise creates an unsteady deterministic loading noise that excites the harmonics of the blade passing frequency by as much as 20 dB, which meant that the installation effect could produce more noise than the rotor itself. As a …
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The Analysis and Prediction of Jet Flow and Jet Noise about Airframe Surfaces
… the propulsion system is integrated with the airframe to shield the noise from the observer. These concepts exhibit situations where the jet exhaust interacts with an airframe surface. Jet flows interacting with nearby surfaces exhibit a complex behavior in which acoustic and aerodynamic …
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Contributions Toward Understanding the Effects of Rotor and Airframe Configurations On Brownout Dust Clouds
… effects of different rotor placement and rotor/airframe configurations. The flow field generated by a helicopter rotor in ground effect operations was modeled by using an inviscid, incompressible, time-accurate Lagrangian free-vortex method, coupled to a semi-empirical approximation for the …
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Supplier relationship management best practices applied to the manufacture of a helicopter airframe in China
… begun program to manufacture the S-76 helicopter airframe at a supplier in China is examined as a case study of supplier relationship management. Best practices and key principles from the literature and other industry case studies are identified. Key concepts covered include: importance of …
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Reduction of front-end loading of inventory : making the airframe industry lean through better inventory management
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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Measurements of Flow in Boundary Layer Ingesting Serpentine Inlets
Highly integrated airframe-propulsion systems featuring ingestion of the airframe boundary layer offer reduced noise, emissions, and fuel consumption. Embedded engine systems are envisioned which require boundary layer ingesting (BLI) serpentine inlets to provide the needed air ow to the engine. …
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Design trade studies and assessment for advanced quiet aircraft concepts
… noise assessment was conducted on the engine and airframe noise sources of the resulting design. The noise impacts of five engine (jet, fan forward, fan rearward, core, and turbine) and airframe (airfoil, elevator, slat, drag rudder, and undercarriage) noise sources were investigated in terms of …
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A modular simulation environment for the improved dynamic simulation of multirotor unmanned aerial vehicles
… model every minute dynamic effect acting on the airframe, but at least the major influences should be modeled so that the simulation provides users with realistic and relevant test data that is comparable with flight test data. This thesis addresses the problem of improved modeling of multirotor …
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An investigation of the microwave upset of avionic circuitry
… are made. A practical investigation of 2-18 GH.z airframe shielding is described, with comparison of the results with those from a number of other aircraft and helicopter types. A study of ingress into avionic boxes is presented and is followed by the results of an investigation of energy coupling …
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Design and acoustic shielding prediction of hybrid wing-body aircraft
… a distributed propulsion system embedded in the airframe. The initial performance assessment shows that the N2A and the N2B aircraft can both meet the N+2 fuel burn goal and that the N2A aircraft is 5.7 EPNdB short of the noise goal. Also, the assessment revealed that current noise prediction …
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