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 13 of 13 for “"weight minimization"”.
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Evolutionary structural optimization method for systems with stiffness and displacement constraints
… from the optimality conditions of the general weight minimization problem. The optimal shape and topology of a structure is obtained by repeated finite element analysis and element removal until the sensitivity numbers become uniform by which the optimality conditions are satisfied, or no …
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Cost reduction of polar class vessels : structural optimization that includes production factors
… rules. In the case of Polar Class vessels, where weight minimization was important, higher fabrication labor costs occurred due to the closely spaced frames and thicker material needed. There was a cost trade-off between minimizing material under the traditional design method and designing a ship …
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Automated design of composite plates for improved damage tolerance
An automated procedure for designing minimum-weight composite plates subject to a local damage constraint under tensile and compressive loadings has been developed. A strain based criterion was used to obtain fracture toughness of cracked plates under tension. Results of an experimental …
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Topology optimization with simultaneous analysis and design
… of trusses and plane stress domains for minimum weight subject to stress and displacement constraints by Simultaneous Analysis and Design (SAND) are considered. The ground structure approach is used. For the truss topology optimization, a penalty function formulation of SAND is compared with an …
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Incorporating Flight Dynamics and Control Criteria in Aircraft Design Optimization
… airplane designs become increasingly lightweight and incorporate high aspect-ratio wings, aeroservoelastic effects gain prominence in modeling and design considerations. As a result, the influence of the flight dynamics and controls on the optimal structural and aerodynamic design needs to …
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A Structural Optimization Scripted Software System
… implemented in Python. A benchmark hollow-tube weight-minimization problem is conducted to test the optimization software system. The percent difference between the solution found by the graphical optimization method and the solution found by the 3D beam finite element model with Sequential …
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A Hybrid Optimization Framework with POD-based Order Reduction and Design-Space Evolution Scheme
… Two different optimization objectives, viz. dry weight minimization, and cruise range maximization are studied by conducting one low-fidelity and two high-fidelity optimization runs to demonstrate the application scope of M3 DOE. The second part of this dissertation describes the development of …
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Designing Power Converter-Based Energy Management Systems with a Hierarchical Optimization Method
… management systems, with a primary focus on weight minimization. Emphasizing modularity and scalability, the research systematically tackles the challenges in optimizing these systems, addressing complex design variables, couplings, and the integration of heterogeneous models. The study …
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Reduced Order Modeling for Efficient Stability Analysis in Structural Optimization
… study was conducted that reformulated the weight minimization problem with a non-convex lower-bound constraint on the fundamental frequency into the standard convex optimization form of semidefinite programming. Applying PMOR to this, it was found the reduced system was able to converge to …
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Optimizing hybrid vehicles : battery pack design, energy management, and collaborative learning
… energy management of blended battery packs for weight minimization, and collaborative learning for improved energy management. The outputs of this thesis include insights into the minimization of air-cooling costs in battery packs, a better understanding of the blended battery pack design space, …
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Vereinfachte Methoden zur optimalen Regelung resonanter Leistungskonverter
… efficiency but also to focus on the size and weight minimization which are playing a major role in this area. Therefore, the research trends in dc-dc, ac-dc, dc-ac, ac-ac topologies are still continuously developing into the direction of new topologies, new control concepts, new materials and …
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Optimal Design and Analysis of Bio-inspired, Curvilinearly Stiffened Composite Flexible Wings
… efficiency and to save aircraft structural weight. The use of the large-aspect-ratio and the light-weight composite wing can lead to an enhanced flexibility of the aircraft wing, which may cause many aeroelastic problems such as large deflections, increased drag, onset of flutter, loss of …
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Passive Component Weight Reduction for Three Phase Power Converters
… to reduce the noise source and reduce the weight and size of the filters. This dissertation is divided into five chapters. Chapter 1 describes the motivations and objectives of this research. After an examination of the surveyed results from the literature, the challenges in this research …