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 19 of 19 for “"Multidisciplinary optimization"”.
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A Model for Multidisciplinary Optimization for Containerships
This thesis describes a multidisciplinary design optimization approach to containership design. The method employs widely accepted regression equations for computing resistance, weights, building costs and operating costs. The current regulations governing freeboard and the Coast Guard wind heel …
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Multidisciplinary Optimization of Next-Generation Aero-Engine Fans
… adoption of high-fidelity numerical analyses and optimization methods, in order to effectively approach problems that can be efficiently, rapidily and affordably solved only through advanced mathematics. There is also the urge to deal with different engineering disciplines simultaneously, by …
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Multidisciplinary Optimization and Damage Tolerance of Stiffened Structures
The structural optimization of a cantilever aircraft wing with curvilinear spars and ribs and stiffeners is described. The design concept of reinforcing the wing structure using curvilinear stiffening members has been explored due to the development of novel manufacturing technologies like …
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Value-based multidisciplinary optimization for commercial aircraft program design
… The methodology suggested herein investigates multidisciplinary design optimization (MDO) involving performance and finance jointly in aircraft program design, as well as assessment of program business risk. A value-based MDO framework couples a performance model with an improved stochastic …
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Multidisciplinary optimization in aircraft design using analysis technology models
An approach to multidisciplinary optimization is presented which combines the Global Sensitivity Equation method, parametric optimization, and analytic technology models. The result is a powerful yet simple procedure for identifying key design issues. It can be used both to investigate technology …
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Modeling and sensitivity analysis of aircraft geometry for multidisciplinary optimization problems
… platforms are not designed for automated shape optimization. In particular, CAD models built with conventional methods can perform poorly in automated design frameworks and their associated CAD systems do not provide shape sensitivities. This thesis aims to remedy these concerns by bridging the …
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Multidisciplinary optimization of aircraft design and takeoff operations for low noise
… Integrating the model with a single-level optimization framework, it was found that optimization for minimum noise can result in a significant noise reduction on takeoff, primarily due to changes in aircraft design and operations. There exists a design-operations coupling between the …
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Multidisciplinary optimization of high-speed civil transport configurations using variable-complexity modeling
An approach to aerodynamic configuration optimization is presented for the high-speed civil transport (HSCT). Methods to parameterize the wing shape, fuselage shape and nacelle placement are described. Variable-complexity design strategies are used to combine conceptual and preliminary-level design …
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MULTIDISCIPLINARY OPTIMIZATION OF NON-SPHERICAL, BLUNT-BODY HEAT SHIELDS FOR A PLANETARY ENTRY VEHICLE
Gradient-based optimization of the aerodynamic performance, static stability, and stagnation-point heat transfer has been completed to find optimal heat shield geometries for blunt-body planetary entry vehicles. In the parametric study, performance trends have been identified by varying geometric …
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Formulation of a structural model for flutter analysis of low aspect ratio composite aircraft wings
… research contributes toward a fully integrated multidisciplinary wing design synthesis by development of an appropriate structural model. The goal is to bridge the gap between highly idealized structural beam / aerodynamic strip models and the very detailed finite element and computational fluid …
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A coarse-grained variable-complexity MDO paradigm for HSCT design
… traditionally processed in a sequential order. Multidisciplinary optimization (MDO), a formal methodology for the integration of these disciplines, is evolving toward methods capable of replacing the traditional sequential methodology of aerospace vehicle design by concurrent algorithms, with …
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Combined Aircraft and Payload Design Optimization Using a Multidisciplinary Architecture
… of a payload-integrated aircraft in this work, a multidisciplinary optimization framework is developed. Response surface modeling and genetic algorithms are implemented in a system modeling structure to inform the unique performance tradeoffs of this complex system. This framework permits the …
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Integration of system-level optimization with concurrent engineering using parametric subsystem modeling
… have given rise to a host of potent numerical optimization methods capable of solving complex multidisciplinary optimization problems containing hundreds of variables, constraints, and governing equations. Unfortunately, such methods are tedious to set up and require significant amounts of time …
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Probabilistic methods for systems engineering with application to nanosatellite laser communications
… engineering approaches such as uncertainty-based multidisciplinary optimization require the use of integrated performance models with input distributions, which do not yet exist for complex systems, e.g. laser communications (lasercom) payloads. In this thesis, we present our development of a …
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EBF3GLWingOpt: A Framework for Multidisciplinary Design Optimization of Wings Using SpaRibs
A global/local framework for multidisciplinary optimization of generalized aircraft wing structure has been developed. The concept of curvilinear stiffening members (spars, ribs and stiffeners) has been applied in the optimization of a wing structure. A global wing optimization framework …
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Numerical Assessment of the Performance of Jet-Wing Distributed Propulsion on Blended-Wing-Body Aircraft
… a Blended-Wing-Body (BWB) distributed propulsion multidisciplinary optimization (MDO) study, two airfoils of different thickness were modeled at BWB cruise conditions. One airfoil, representative of an outboard BWB wing section, was 11% thick. The other airfoil, representative of an inboard BWB …
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Structural Modeling and Optimization of Aircraft Wings having Curvilinear Spars and Ribs (SpaRibs)
The aviation industry is growing at a steady rate but presently, the industry is highly dependent on fossil fuel. As the world is running out of fossil fuels and the wide-spread acceptance of climate change due to carbon emissions, both the governments and industry are spending a significant amount …
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Development of Approximations for HSCT Wing Bending Material Weight using Response Surface Methodology
… data gathered from a large number of structural optimizations. To reduce the time of performing a large number of structural optimizations, coarse-grained parallelization with a master-slave processor assignment on an Intel Paragon computer is used. The results of the structural optimization are …
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Autonomic Product Development Process Automation
Market globalization and mass customization requirements are forcing companies towards automation of their product development processes. Many task-specific software solutions provide localized automation. Coordinating these local solutions to automate higher-level processes requires significant …