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 159 for “"Aircraft Design"”.
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Signomial programming for aircraft design
Due to the coupled nature of aircraft system design, it is important to consider all major subsystems when optimizing a configuration. This, however, is easier said than done, particularly because each individual subsystem model can be arbitrarily complex. By restricting an optimization problem to …
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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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Afterbody drag prediction for conceptual aircraft design
With the increasing performance demands placed on aircraft, the nozzle is becoming a much more versatile component. This versatility is increasing the afterbody complexity and the difficulty in afterbody drag prediction. This thesis documents a computationally inexpensive method for estimating the …
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Integrated Framework for Aircraft Design and Assembly Tradeoffs
Aircraft passenger traffic is expected to increase and lead to demand for 40,000 new aircraft by 2040. Aircraft production rates have been rising to meet this demand, but delivery backlogs are growing at even faster rates. Large backlogs can lead to missed deliveries, canceled orders, and traffic …
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An Optimization Centered Approach to Multifidelity Aircraft Design
… across all of engineering is the concept of design optimization. When a new product is in development, it is the job of the design team to ensure the final result performs well as measured by some set of evaluative criteria, and design decisions are made throughout the process in an effort to …
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Nature's engineering : a blueprint for efficient aircraft design
… da Vinci and Wilbur and Orville Wright to design aircraft that mimic the behavior they observed. The success of the Wright brothers' first controllable aircraft ushered in an era of rapid advances in aviation technology leading to the airplanes of today. Despite these advances, airplanes …
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AeroSandbox: A Differentiable Framework for Aircraft Design Optimization
… a new computational framework for conceptual aircraft design called AeroSandbox. This framework leverages modern techniques for automatic differentiation developed in the optimal control and machine learning communities. By combining these efficient gradient calculations with robust optimizers …
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Advanced Structural Concepts and Simulation for Aircraft Design & Production
L'abstract è presente nell'allegato / the abstract is in the attachment
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Fusion of correlated information in multifidelity aircraft design optimization
Models used in engineering design often face trade-offs between computational cost and prediction uncertainty. To ameliorate this problem, correlated models of varying fidelities are used together under different fidelity management strategies to produce accurate predictions while avoiding …
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An Analysis of Using CFD in Conceptual Aircraft Design
… package may be incorporated into a conceptual design method is performed. The repeatability of the CFD solution as well as the accuracy of the calculated aerodynamic coefficients and pressure distributions was also evaluated on two different wing-body models. The overall run times of three …
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Multidisciplinary optimization in aircraft design using analysis technology models
… yet simple procedure for identifying key design issues. It can be used both to investigate technology integration issues very early in the design cycle, and to establish the information flow framework between disciplines for use in multidisciplinary optimization projects using much more …
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A historical perspective of aircrew systems effects on aircraft design
The design of the aircrew workstation often has not been an orderly part of the overall aircraft design process but rather of much lower priority than the integration of the airframe and powerplant. However, the true test of the aircraft is how well the aircrew can use the aircraft for mission …
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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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Incorporating Flight Dynamics and Control Criteria in Aircraft Design Optimization
… emissions, and noise via efficient aeroelastic design and improvements in propulsion systems. As modern transport airplane designs become increasingly lightweight and incorporate high aspect-ratio wings, aeroservoelastic effects gain prominence in modeling and design considerations. As a result, …
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Advances in aircraft design: multiobjective optimization and a markup language
… feasible only for advanced and detailed design are now available and even practical at the conceptual design stage. This changing philosophy for conducting conceptual design poses additional challenges beyond those encountered in a low fidelity design of aircraft. This thesis takes some …
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Optimal Geometric Trimming of B-spline Surfaces for Aircraft Design
B-spline surfaces have been widely used in aircraft design to represent different types of components in a uniform format. Unlike the visual trimming of B-spline surfaces, which hides unwanted portions in rendering, the geometric trimming approach provides a mathematically clean representation. …
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Life cycle cost modelling as an aircraft design decision support tool
… unmanned air vehicles. A novel classification of aircraft product definition is utilised and a framework to estimate the life cycle cost of aircraft using the product definition is presented. The architecture to estimate the life cycle cost and the associated models are described.<br/>The …
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Multidisciplinary optimization of aircraft design and takeoff operations for low noise
Aircraft planform design, takeoff operations, and airfoil design are examined as a complete system in order to quantify tradeoffs that can result in a quiet aircraft. An aircraft design model was developed to generate blended-wing-body-type designs using simple-physics models and empirical scaling …
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Conceptual aircraft design for environmental impact : modeling operations for emissions assessment
… performance and economics. The Environmental Design Space (EDS) project explores the tradeoffs between noise, emissions, and economics for conceptual design of future aircraft. A key component to EDS is modeling the emissions of aircraft in operation. Traditional design tools need more …
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Development of an engine model for an integrated aircraft design tool
… for the propulsion module in the Transport Aircraft OPTtimization (TASOPT) code. The goal of this work is to improve the accuracy and applicability of TASOPT in conceptual design of advanced technology, high bypass ratio, small-core, geared and direct-drive turbofan engines. The engine …
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