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 33 for “"Manufacturing constraints"”.
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Automatic modification of part geometries subject to manufacturing constraints using fuzzy logic
… modification of geometric models in response to manufacturing process constraints. Designers typically initiate product models using ideal, exact geometry; however, several non-traditional manufacturing processes frequently require slight modifications to the ideal model to accommodate various …
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Design for Additive Manufacturing Considerations for Self-Actuating Compliant Mechanisms Created via Multi-Material PolyJet 3D Printing
… optimized, actuating structures using additive manufacturing processes (AM). By developing a consistent, repeatable method for designing and manufacturing multi-material compliant mechanisms, significant performance improvements can be seen in application, such as increased mechanism deflection. …
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Generating CAD Parametric Features Based on Topology Optimization Results
… of current designs, as well as the tooling and manufacturing procedures. However, due to its complexity, the optimal topology results are often discarded or recreated by hand into a CAD model. From a design stand point, the results can be improved with the use of manufacturing constraints on the …
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New strategies for PCB routing
… and more than ten signal layers. Moreover, the manufacturing constraints require all nets to be routed in the planar fashion and the designer requires nets in the same bus to be routed together without any other net. All these factors pose new challenges for the PCB routing problem, making the …
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Symbiotic Encounter: Shape Memory Alloy Actuators in Architecture
… with respect to functional objectives, manufacturing constraints, and performance goals. My research will gather dispersed knowledge across materials science, mechanics, and fabrication processes relevant to architectural SMAs. After conducting extensive research and different stages of …
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Feasibility assessment and design of micro hydraulic solid-state transducers
… system performance, existing issues, and manufacturing constraints. It is concluded that the concept is feasible and warrants further development.
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Design, Fabrication, and Experimental Investigation of an Additively Manufactured Flat Plate Heat Pipe
… cycle begins again. Additive manufacturing techniques allow for manufacturing complex parts that are typically not feasible with conventional manufacturing methods. Thus, additive manufacturing opens the possibility to develop high performance heat pipes with complex shapes. In …
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Advanced aircraft passenger seat : a qualitative and quantitative study of comfort
… of these needs, airline needs and seat manufacturing constraints was integrated into a design tool, Quality Function Deployment, to end up with two new concepts of aircraft economy seats. The first concept used a webbed back instead of a conventional cushion back, the second concept had …
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Minimizing high spatial frequency residual in active space telescope mirrors
… residual components: actuation-induced dimpling, manufacturing-induced print-through, and disturbance-induced uncorrectable error. The methods for simulating each effect are discussed, and an objective function is developed to quantify the effects of these residual components to gage the …
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Design, Analysis and Experimental Evaluation of 3D Printed Variable Stiffness Structures
<p>The rapid progress of additive manufacturing (AM) introduces new opportunities but also new challenges for design and optimization to ensure manufacturability, testability and accurate representation/prediction of the models. The present dissertation builds a bridge between design, optimization, …
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Development and research of porous alumina xerogel membranes for electrospray propulsion applications
… around 40-50%) and briefly investigates a manufacturing procedure. The main problem facing the performance of these extractor membranes is the consistency of their geometry and porosity given the manufacturing constraints to make these engines easily scalable and relatively cheap. Xerogels …
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Efficiency, manufacturability, and modeling challenges in structural design optimization
… of composite structures fabricated via additive manufacturing, and topology optimization of structures under contact boundary conditions. We first give a general overview and some new developments of the analytical and semi-analytical sensitivity analyses for nonlinear steady state, transient and …
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Development of a Student Operated Production Facility using Discrete Event Simulation and Continuous Improvement
… for hands-on learning experiences in smart manufacturing. The laboratory’s main method is the desktop fiber extrusion device, FrED, produced in the student-operated and -managed FrED Factory. This paper chronicles an intensive eight-month project directed toward enhancing the efficiency and …
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Design of automotive joints: using optimization to translate performance criteria to physical design parameters
… performance targets and satisfies packaging and manufacturing constraints. These tools can be viewed as translators that translate the design parameters defining the geometry of a joint into performance characteristics of that joint and vice-versa. The methodology for developing the first …
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Methods for designing the next generation of aircraft architectures using topology optimisation
… associated with the implementation of buckling constraints in topology optimisation. This thesis explores these issues, and methods are proposed for circumventing them. The effect of problem formulation on optimal topologies is demonstrated through the use of various design and manufacturing …
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An assessment of the aerodynamic, thermodynamic, and manufacturing issues for the design, development, and microfabrication of a demonstration micro engine
… of the aerodynamic, thermodynamic, and manufacturing issues associated with the design, development, and microfabrication of an all-silicon demonstration microengine. The design goal is the simplest feasible engine that can demonstrate the micro gas turbine engine concept. This demo …
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An interface-enriched generalized finite element method for the design of actively-cooled microvascular composites
… is studied in this thesis project. Besides manufacturing constraints, the optimal network configuration in the microvascular composite depends on a variety of parameters including the dimensions of the plate, applied thermal loads, diameter and shape of the microchannels, and type of the …
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Simulation methods for plasmonic structures
… fabrication uncertainties arising from extreme manufacturing constraints. Mathematical modeling and numerical simulation are therefore essential to accurately predict the response of the physical system, and must be incorporated in the design process. Nonetheless, plasmonic simulations present …
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Transonic flutter prediction and aeroelastic tailoring for next-generation transport aircraft
… burden of including transonic utter constraints in conceptual design tools, and to offer a potential solution for mitigating utter problems through the use of additive manufacturing techniques, specically focusing on a design methodology for lattice structures. To reduce the …
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A parametric model for rapid analysis of automotive joints
… designs satisfy given performance targets and manufacturing and packaging constraints. Therefore, it would be very useful to have a tool that rapidly analyzes the performance of a design, checks if this design is manufacturable, and meets packaging and styling requirements. This thesis presents …
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