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 70 for “"transport aircraft"”.
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M28 Fixed wing transport aircraft cost reduction
… short-takeoff-and-landing (STOL) light cargo aircraft developed in 1984 and currently built by PZL Mielec, a subsidiary of United Technology Corporation (UTC). There has been renewed interest in the product from military and commercial markets due to its impressive STOL capabilities. However, …
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Multidisciplinary Design Optimization of Low-Noise Transport Aircraft
… research is to examine how to design low-noise transport aircraft using Multidisciplinary Design Optimization (MDO). The subject is approached by designing for low-noise both implicitly and explicitly. The explicit design approach involves optimizing an aircraft while explicitly constraining the …
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Aeroacoustics of perforated drag plates for quiet transport aircraft
Historically aircraft noise is one of the principal environmental issues for aviation. Within this context, the Silent Aircraft Initiative was launched with the objective to achieve a step-change in noise reduction compared to current practice. One of the most critical tasks in noise reduction is …
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A Direct Synthesis Method for the Conceptual Design of Transport Aircraft
<p>The problem of synthesizing a transport aircraft at the conceptual design level is considered. A direct sizing algorithm that does not require iteration is developed. Such direct synthesis methods can be used as important building blocks in an aircraft optimization process. New statistical …
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Transonic flutter prediction and aeroelastic tailoring for next-generation transport aircraft
Novel commercial transport aircraft concepts feature large wing spans to increase their fuel efficiency; these wings are more flexible, leading to more potential aeroelastic problems. Furthermore, these aircraft fly in the transonic flow regime, where utter prediction is difficult. The goals for …
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Optimization of a mixer-ejector system for supersonic civilian transport aircraft
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Regional Transport Aircraft Design using Turbo Electric Distributed Propulsion (TEDiP) System
… Administration (NASA) and Advisory Council for Aircraft Innovation and Research in Europe (ACARE). The airline industry supports these goals because of their positive impact on operational cost and the environment. Achieving such goals requires introduction of novel technologies and aircraft …
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The multidisciplinary design and organization of an unconventional, extremely quiet transport aircraft
(cont.) aircraft. A design which utilized the results of the trade studies was presented and evaluated. The performance was reviewed in terms of aerodynamics, weight, economics, operations, and acoustics. The resulting design is compared with current commercial aircraft using the DOC model to …
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Application of overset grids for aerodynamic assessment of an advanced civil transport aircraft
… 1:11 scale configurations of an advanced civil transport designed to use boundary layer ingestion (BLI). Comparison with wind tunnel results on unpowered configurations show that the computed and measured lift slopes agree within 15% and the drag at simulated cruise point to within 20%. …
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Aerodynamic Analysis of Variable Geometry Raked Wingtips for Mid-Range Transonic Transport Aircraft
… to a next-generation, transonic, mid-range transport aircraft. Several models were created to simulate various sweep positions for the VGRWT/NCE tip, as well as a baseline model with an untreated wingtip. The majority of investigation was conducted using the VLM software, with CFD used …
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Design Optimization of a Regional Transport Aircraft with Hybrid Electric Distributed Propulsion Systems
… necessitates the advent of novel and radical aircraft technologies, NASA's X-57, is one such concept using distributed electric propulsion (DEP) technology. Although practical implementation of DEP is achievable due to the scale invariance of highly efficient electric motors, the current …
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Multidisciplinary Design Optimization of a Medium Range Transonic Truss-Braced Wing Transport Aircraft
… the performance of medium range, transonic transport aircraft. The truss and strut-braced wing concepts synergize structures and aerodynamics to create a planform with decreased weight and drag. Past studies at Virginia Tech have found that these configurations can achieve significant …
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Microburst Recovery For Jet Transport Aircraft: A Comparison Between Constant And Variable Pitch Guidance Trajectories
… constant pitch strategy. A Boeing 737 level C aircraft simulator was employed to evaluate these findings in a dynamic environment. Three appropriately qualified subjects piloted 35 flights through a microburst, while computer generated data were collected. "Safety", defined as the maximization …
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Computational Prediction of Stall Aerodynamics and Evaluation of Ground Effect for a Generic Transport Aircraft
Flight safety of modern transport aviation depends to a large extent on the skills of the pilot in dealing with manual aircraft control in critical Flight situations.According to Boeing's document " Statistical Summary of Commercial Jet Air-plane Accidents, Worldwide Operations (1959-2016)" about …
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International regulation of commercial civil aircraft : regulatory agencies and requirements governing large transport aircraft certification
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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High Fidelity and Efficient Computations of Dynamic Loads for Multidisciplinary Design Optimization of Flexible Transport Aircraft
The current state-of-the-art design optimization of airframes is tightly wounded to its loads analyses as the process is usually conducted employing a deterministic set of critical load cases. The sheer number of scenarios required to estimate the critical loading conditions prevent these two …
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The Effect of Reducing Cruise Altitude on the Topology and Emissions of a Commercial Transport Aircraft
… conducted for alternative commercial transonic aircraft design configurations, such as the strut- braced wing and the truss-braced wing aircraft designs, in order to improve aircraft performance and reduce the impact of aircraft emissions as compared to a typical cantilever wing design. Research …
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An Investigation of the Floor Attachment Assembly of a Large Transport Aircraft Seat Subjected to Crash Dynamic Loadings
<p>Accident investigations by the National Transportation Safety Board concluded that the passenger seat and restraint systems found in today's aircraft used by the airlines are inadequate to protect the occupant in airplane crashes. Computer models were developed of the seat-track assembly and …
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