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 18 of 18 for “"Aircraft Conceptual Design"”.
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Inlet drag prediction for aircraft conceptual design
… at enhancing ACSYNT, a computer program for aircraft conceptual design, has necessitated the development of methods for predicting inlet drag. Originally, the drag of only one inlet type, the variable-geometry conical inlet, could be calculated within ACSYNT. This prompted the present …
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Control authority assessment in aircraft conceptual design
All aircraft must meet controllability requirements to be certified for commercial use or adopted by the mi1itary. Aircraft maneuverability is often 1imited by control authority. Thus, it is essential for designers to evaluate a candidate concept's control authority early in the conceptual design …
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Landing gear integration in aircraft conceptual design
The design of the landing gear is one of the more fundamental aspects of aircraft design. The design and integration process encompasses numerous engineering disciplines, e.g., structure, weights, runway design, and economics, and has become extremely sophisticated in the last few decades. Although …
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Power system sizing and analysis for electric aircraft conceptual design
… propulsion system for electric airplanes at the conceptual design level. Considerations for machine type, energy storage technology, volume packaging, and modeling are discussed. The methodology is applied to a design study for a medium-altitude, long-endurance survey drone to demonstrate the …
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Considerations in the development of a survivability/lethality tradeoff submodel for advanced tactical aircraft conceptual design
… is a mixture of scientific approaches to conceptualizing problems and solving them through research, design and analysis. In system dynamics, differential equations are represented in the form of difference equations. There is no limit to the number that can be employed to represent the …
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An Approach to Incorporate Additive Manufacturing and Rapid Prototype Testing for Aircraft Conceptual Design to Improve MDO Effectiveness
… stability and control (SandC) WT data into aircraft conceptual design multidisciplinary design optimization (MDO). Both objectives are evaluated in terms of data quality, time, and cost. FDM(TM) and PolyJet AM processes were used for model production at low cost and time. Several models from …
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Turbofan engine sizing and tradeoff analysis via signomial programming/
… on first principles, and meant to be used during aircraft conceptual design optimization. The model is formulated as a signomial program, which is a type of optimization problem that can be solved locally using sequential convex optimization. Signomial programs can be solved reliably and eciently, …
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Propulsion system analysis for conceptual design: drag and losses of nozzles and mixed compression inlets
… inlet configurations. These inlets are designed for use in aircraft with sustained supersonic cruise capabilities such as the HSCT. The drag and pressure recovery prediction methods have been added to ACSYNT, an aircraft conceptual design program. Also included in this thesis is a survey …
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A PHIGS-based spreadsheet for conceptual design
There are several computer aided design systems which exist to aid the conceptual phase of design. These CAD systems provide adequate geometry input, but often lack the capability to interactively obtain large amounts of numerical and text input often needed by analysis software. An interactive …
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A heuristic for including black box analysis tools into a geometric programming formulation
… been proposed as a powerful tool for enhancing aircraft conceptual design. While geometric programming has shown promise in early studies, current formulations preclude the designer from using black box analysis codes which are prolific in the aircraft design community. Previous work has shown …
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Effect of Slot Span on Wing Performance
… formulations are developed for use in aircraft conceptual design. First, a two-dimensional CFD comparison between different viscous models is performed in order to define the most accurate model at the Reynolds number of interest. Second, a three-dimensional study is performed over a …
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Projection, design, and representation of curves on B-spline surfaces
In an interactive design process, tools that provide visual feedback on the design model are highly valuable. This research explores a specific topic of graphical visualization and geometric modeling. An approach dealing with projecting and mapping plane curves onto a B-spline surface is presented. …
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An object-oriented, PHIGS-based Internal Layout Module for aircraft design
During the conceptual design phase, aircraft designers require tools to be able to quickly and accurately produce concepts that meet given requirements. These tools often take the form of computer programs and computer-aided design systems which model the shape of the airplane concept and perform …
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Uncertainty budgeting methods for conceptual aircraft design
… management of uncertainty are critical in the design of engineering systems, especially in the early stages of conceptual design. This thesis presents an approach to defining budgets on the acceptable levels of uncertainty in design quantities of interest, such as the allowable risk in not …
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Development of a Multi-Disciplinary Design Optimization Framework for a Strut-Braced Wing Transport Aircraft in PACELAB APD 3.1
… PACELAB APD 3.1, a recent commercially available aircraft preliminary design tool with potential for MDO applications, for higher fidelity with physics-based instead of empirical methods and to enable the analysis of nonconventional aircraft configurations. The implementation of these methods was …
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Modeling and sensitivity analysis of aircraft geometry for multidisciplinary optimization problems
A new geometry management paradigm for aircraft design utilizes Computer Aided Design (CAD) systems as the source for consistent geometry models across design phases and analysis tools. Yet various challenges inhibit the widespread application of CAD models in aircraft conceptual design because …
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Methodology and Tools for High-Speed Vehicles Conceptual Design to Support Environmental Regulations
L'abstract è presente nell'allegato / the abstract is in the attachment
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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 …