Image Theses and Dissertations The reliability of simple progressive dies The stamping process, of which the punching process is a major division, is one of the most important metal parts production methods in industry. Punching dies are the heart of the punching process. Die performance, as measured by the number of strokes between sharpenings and/or repairs, determines the important per part costs of die depletion and maintenance. Existing quantitative studies are principally on tool wear and punchability. View Item
Image Theses and Dissertations Stress intensity factors for cracks in anisotropic materials using enriched finite elements View Item
Image Theses and Dissertations Electro-mechanical modeling and simulation of RF MEMS switches View Item
Image Theses and Dissertations Automated simulation of 3-D crack propagation on bimaterial interfaces in semiconductor packages View Item
Image Theses and Dissertations On the hypothesis that a direct correlation exists between methods changes and related productivity changes in non machine-controlled work situations This hypothesis: a direct correlation exists between methods changes and related productivity changes in non machine-controlled work situations, appeared to be at the root of many problems in applied work measurement. Therefore, the author decided to conduct an objective, quantitative analysis of its validity. View Item
Image Theses and Dissertations The utility of information a method of evaluation The fundamental relationships among the design parameters of an information system and the utility of the information that a system produces are analyzed in an effort to develop a methodology for measuring the utility of information. The utility of the information is defined as a measure of the effectiveness with which the information can be employed to attain the objectives of the using organization. View Item
Image Theses and Dissertations An investigation into the output distributions of gert networks by the use of simulation The purpose of this research was to further the investigation into GERT output distributions. From the family of GERT networks containing only Exclusive-Or nodes, a generally applicable network form was chosen for simulation. A generalized computer program was written to simulate any specific network of this form. View Item
Image Theses and Dissertations Experimental Study of High-Speed Boats with Suspended Flaps for Reducing the Slamming Forces This thesis consists of two parts. In the first part a small-scale high-speed monohull boat was fitted with a suspended flap under the bottom. The author tested shock absorbers for this boat, and worked on data analysis from a few initial test runs. The boat tests were performed during a few hours in a single day and the data are far too scarce to draw any conclusions. The second part of the thesis concerns multi-body numerical analysis of a suspension boat that consists of an airborne centerhull and four suspended sponsons. No simulations of boat dynamics in waves were performed. View Item
Image Theses and Dissertations The Applications of Enriched Finite Element Analysis in Electronic Packaging View Item
Image Theses and Dissertations Application of a simulator for short term forecasting in a high volume multi-product production line The solutions to the problems of production forecasting, scheduling, and in-process inventory control for high volume multi-product manufacturing lines are not readily available in current industrial literature. This study proposes simulation as a general approach to solving these problems and proceeds to develop a simulator which is applied to just such a high volume line. View Item
Image Theses and Dissertations Utility sub-systems in the building industry The building industry is perhaps the most fragmented large industrial complex in the country today. Consumers are expressing needs for faster delivery for more functional and sophisticated space at more reasonalble prices. At the same time, the industry in itself is faced with growing internal problems which are making it increasingly more difficult to perform even as well as in the past. This study investigates the area of utility sub-systems in the building industry. View Item
Image Theses and Dissertations An investigation of the relationship between manufacturing policies and plant layout in a job shop Utilizing CRAFT an optimum plant layout with regard to all products manufactured can be realized. In addition, two manufacturing policies; related to production and inventory control, will be investigated with respect to the effect of said policies on plant layout. View Item
Image Theses and Dissertations On the computational efficiencies of the primal-dual algorithm and the uv-method for solving transportation problems Computational efficiencies of the primal-dual algorithm and the uv-method in solving transportation problems are compared in this thesis. A computer program was written in Fortran IV and run on the CDC 6400 system; it generated random problems with integer constants ranging in the size from 5X10 to 30 X 50, and solved them by both methods. View Item
Image Theses and Dissertations Analysis of buckling in thin epoxy films due to thermal/moisture induced stresses View Item
Image Theses and Dissertations A non-parametric incremental feedback control system for stochastic processes This is a result of an initial investigation to simplify feedback controllers for stochastic processes. The investigation concerns itself with incrimental control as opposed to proportional control. View Item
Image Theses and Dissertations Quantification of intangible factors in product design decisions This paper concerns itself with quantification of the intangible factors in Product Design Decisions where there is one very big supplier with one very big customer and a unique product. The product design is represented as a state diagram, or curve, with Time as one axis and Product or Material State as the other. Industry affects the product design curve with various levels of decisions. This paper describes four of these levels and investigates a case in which three levels are involved. View Item
Image Theses and Dissertations A method of estimating the value of a computer based on-line operations control system in a production shop A simulation program is presented that develops a risk profile of the intended investment. The risk profile is essentially a return on investment probability analysis developed from the estimated distributions of costs, service life and savings of the intended investment in a computer based, on-line system. View Item
Image Theses and Dissertations Fracture Analysis Using Enriched Finite Elements for Three-Dimensional Welded Structures View Item
Image Theses and Dissertations An investigation of the feasibility of applying linear progamming to assembly line balancing An investigation of the feasibility of applying linear programming to assembly line balancing problems is presented. Salveson and Bowman developed the mathematical models. View Item
Image Theses and Dissertations Effect of Residual Stresses on the Stress Intensity Factors for Cracks Near Fillet Welds In this study, Stress Intensity Factors are calculated for cracks located at the toe of a fillet weld subjected to residual stresses due to the welding. The welding model used in this study is based on Longitudinal stiffener test specimens. The meshes generated for these models were obtained from the commercial code HYPERMESH. The welding heat transfer simulation and calculation of the welding residual stresses used the explicit FE commercial code SYSWELD. View Item
Image Theses and Dissertations Thermal Effects on Restoring Force and Dielectric Charge Density of RF MEMS Switch View Item
Image Theses and Dissertations Autogenous Welding on a Flat Plate: The Effect of Phase Change Transformation on Residual Stress The objective of this study is to predict the magnitude and spatial variation of the residual stresses in an autogenously welded flat plate. Autogenous welding is a fusion welding process using heat without the addition of filler metal to join two pieces of the same metal. The residual stresses in a flat plate, close to the weld pool, are closely examined in this study. Using the welding simulation program SYSWELD, a 2-D geometric model was constructed using ANSYS 15.0, then meshed with quadratic 2-D elements in Visual-Mesh 10.0. View Item
Image Theses and Dissertations Analysis of Orbital Friction Welding for Titanium Blades on Compressor Drum The Orbital friction welding process utilizes high heat generated at the interface from friction to form a high strength weld. A full transient thermal 3D analysis combined with axial displacement was conducted using ANSYS to simulate this welding process. The goal was to model the process of orbital friction welding by incorporating industry-relevant parameters under realistic boundary conditions. The work illustrates the dependency of the temperature profile on various processing parameters at any point in time in the welding process. View Item
Image Theses and Dissertations Matrix model for evaluating management information systems with consideration of the time relationships of data and reports The subject considered in this paper is the temporal relationship of data flow through an information system and how this flow may be described by a mathematical model. View Item