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 54 for “"process parameter"”.
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Critical process parameter determination during production start-up
… attempts to develop a framework for analyzing process data quickly and efficiently during a new product start-up in order to provide information for the short term goals relating to attaining stable processes as well as provide guidance on long term handles for process improvement. First, a …
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The epitaxial Lift-Off Process: Parameter Studies and Solar Cell Application
Contains fulltext : 19480_epitliofp.pdf (Publisher’s version ) (Open Access)
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Development of the process parameter map for reference free part encapsulation
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
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An integrative approach to process parameter selection in fused-silica capillary manufacturing
Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1992 and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1992.
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Machine learning-based stress-strain prediction and process parameter optimisation in material extrusion additive manufacturing
… However, the layer-by-layer deposition process inherent in this technique results in considerable variability in mechanical performance. Among the most critical challenges is the difficulty in accurately predicting and controlling the full stress-strain behaviour of the printed parts. A …
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Investigation of mould design and process parameter optimisation of plastic injection moulding for thin wall part
… faced by the moulders since the mould and processing parameters are critical to produce good quality of thin wall parts. This research describes the mould design and process parameter aspects of thin wall part focusing on tubular shape The aim of the research is to investigate the factors …
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DEVELOPMENT OF FUZZY-NEURO APPROACH BASED INTELLIGENT SYSTEMS FOR PARAMETER RESETTING OF INJECTION MOULDING
… moulding is a commonly used manufacturing process due to its mass production capacity and relatively low production cost per part. However, process parameter setting for moulding defect correction is a complex and difficult task since a large number of factors ranging from part design to …
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Characterization of the Surface Roughness of Overhangs manufactured by Laser Powder Bed Fusion Process using Design of Experiments
… applications, but the initial development process of evaluating a new material on a M-LPBF printer can be time consuming and costly. In this work, a framework to improve the efficiency and structure of M-LPBF process development is proposed. First, simulations of the melt pool were …
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Laser Powder Bed Fusion Process Characterization: Design of Experiments for Dimensionally Accurate Thin Walls
… for aerospace applications, but the initial process of evaluating a new material on a M-LPBF printer can be time-consuming and costly. In this thesis, a framework to improve the efficiency and structure of M-LPBF process development is proposed. First, simulations of the melt pool were …
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Framework to Accelerate Parameter Development for Laser Powder Bed Fusion
… applications, but the initial development process of evaluating a new material on a M-LPBF printer can be time consuming and costly. In this work, a framework to improve the efficiency and structure of M-LPBF process development is proposed. First, simulations of the melt pool were …
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Smart Quality Assurance System for Additive Manufacturing using Data-driven based Parameter-Signature-Quality Framework
… with complex shapes are manufactured. AM is the process of layering materials to produce objects from three-dimensional (3D) models. AM technology can be used to print objects with complicated geometries and a broad range of material properties. However, the issue of ensuring the quality of …
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Inline Coherent Imaging of Laser Additive Manufacturing
… defense. Despite the advantages offered by these processes, online quality assurance and process control still remain major challenges limiting the widespread adoption of these techniques. In this thesis a low-coherence interferometric imaging technique, termed inline coherent imaging (ICI), is …
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Exploratory data analysis for preemptive quality control
… quality control on low-tech industrial processes with abundant process data. This involves a 4 stage process which includes understanding the process, interpreting and linking the available process parameter and quality control data, developing an exploratory data toolset and presenting …
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Distributed dispatchers for partially clairvoyant schedulers
… systems. The dispatching model accommodates process parameter variability and analyzes the effect of variable execution times.;Hard real-time systems are modeled in the E-T-C scheduling framework and dispatched if a valid schedule exists. We examine the dispatchability of Partially …
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Distributed Generation Reformer and Fuel Cell System Modeling and Reformer Catalyst Layer Optimization
… Fluent to more accurately model the reforming process. Parameter studies on the reformer catalyst layer showed that reducing catalyst layer porosity along the length of the reformer results in improved reformer performance because of increased catalyst mass and higher reaction rates downstream …
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Effects of flux application and melting parameters in investment casting of pure aluminium by in-situ melting technique
… various factors including melt quality, casting process parameter and pouring technique. Even though, melt treatment and controlled of the process parameter have promising result, however turbulence developed during pouring of molten aluminium increasing the formation of porosity as a result of …
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Fiber Orientation Prediction and Strength Evaluation of Composite Spur Gears Reinforced by Discontinuous Fiber
… regulated by the flow of polymer matrix during processing. Injection molding is one of the most widely used manufacturing methods for the production of plastic parts. Injection molding has so many process parameters which directly influences the orientation of fiber and structural properties of …
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Carbon nanotube synthesis for integrated circuit interconnects
… positions, at temperatures compatible with CMOS processing (below 500"C), and with the appropriate electrical connections, remain challenges that are hindering their introduction into industry. The purpose of this study was to develop the processes and understanding needed to establish CNTs as …
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Parametric Modeling, Analysis, Classification, and Optimization of the Laser Polishing Process with Respect to the Working Distance
… the surface or generate structures on it. The process of surface smoothening is achieved via surface polishing utilizing laser remelting (SP-LRM). The process of structure generation is achieved via surface structuring by means of laser remelting (SS-LRM). The working distance of the laser beam …
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