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Theses/Dissertations

Mechanical engineering

Operations Research, Systems Engineering and Industrial Engineering

Articles 1 - 9 of 9

Full-Text Articles in Engineering

Managing Multiple Unmanned Aerial Vehicles From A 3d Virtual Environment , Jared Scott Knutzon Jan 2006

Managing Multiple Unmanned Aerial Vehicles From A 3d Virtual Environment , Jared Scott Knutzon

Retrospective Theses and Dissertations

One hundred and three years ago the aviation age began with the Wright brothers in Kittyhawk, North Carolina. It is well known that manned aviation has made tremendous progress over the decades that followed. Less familiar are the deep history and roots of unmanned aviation, which is often thought of as a recent phenomenon. Initially, modern unmanned aerial vehicles (UAVs) were instruments of war, and the challenge was to develop an unmanned system that could fly a preplanned route and return home. Once this level of autonomy was reached, it became clear that UAVs would have a considerable impact on ...


Chip-Controlled 3-D Complex Cutting Tool Insert Design And Virtual Manufacturing Simulation , Shizhuang Luo Jan 1999

Chip-Controlled 3-D Complex Cutting Tool Insert Design And Virtual Manufacturing Simulation , Shizhuang Luo

Retrospective Theses and Dissertations

Designing suitable tools for the turning operation is of vital interest to manufacturers. The tool inserts used nowadays adopt complex geometric shapes. A question facing many manufacturers is how to effectively design complex shaped tool inserts and how to prove the validity of such design. One of the important criteria for selecting inserts is the ability to control chip formation and chip breaking;The research work described in this dissertation attempted to bring innovation into the cutting tool insert design process by using feature-based modeling and by proposing a predictive chip model and integrating it into the design process. Such ...


Process Monitoring And Fault Classification For An Air Handling Unit , Kyung-Jin Jang Jan 1999

Process Monitoring And Fault Classification For An Air Handling Unit , Kyung-Jin Jang

Retrospective Theses and Dissertations

The objective of this research is to develop a model using multivariate statistical methods to identify system faults in an air-handling unit (AHU). The effects of using a reduced amount of available information are investigated. The faults are simulated and are applied in an actual flow loop facility;The process model fault scheme as presented in Iserman (1987) was adopted for this research. Unlike the parameter estimation from Iserman study, the procedures for detecting and diagnosing AHU faults in this study use multivariate Statistics and Probability; To aid the research, a factorial experimental design was developed and experimental normal and ...


Development And Realization Of A Single-Mode Optical Fiber Ferrule Mold Insert With Twelve Channels, Hsiharng William Yang Jul 1998

Development And Realization Of A Single-Mode Optical Fiber Ferrule Mold Insert With Twelve Channels, Hsiharng William Yang

Doctoral Dissertations

A manufacturing process for an optical fiber ferrule mold insert with twelve channels has been established. This research project presents mask design, mask fabrication, deep X-ray lithography exposure, resist developing, nickel electroforming, as well as surface finishing to attain the final result. Deep X-ray mask fabrication methods are explored, including mechanically machined masks, micro-EDM masks, and E-beam written masks. The exposures to pattern resists and electroforming to fabricate nickel molds up to 500 $\mu$m thickness are reported in this study. Nickel structures for the optical fiber ferrule insert with twelve channels made by electroforming are the final products. A ...


Field Study Of Energy Savings In Manufacturing Facilities , Karen Louise Smith Jan 1996

Field Study Of Energy Savings In Manufacturing Facilities , Karen Louise Smith

Retrospective Theses and Dissertations

Many energy conservation projects have been implemented, and a great deal of investment will be made in the future. Yet little data are available showing the actual energy savings achieved. This project evaluated energy conservation projects related to compressors, boilers, and reducing heating and cooling loads, through monitoring at six industrial facilities and in on-campus facilities;As predicted by theory, lowering the exit pressure from the air compressor resulted in lower power consumption for positive displacement compressors. For the screw compressor studied, the isentropic compression model does a good job of predicting the savings due to a decreased compressor exit ...


Analytical And Finite Element Modeling Of A Machining System To Minimize Inaccuracy In Milling And Using Rapid Prototyping For Die Manufacturing , Parag Gupta Jan 1996

Analytical And Finite Element Modeling Of A Machining System To Minimize Inaccuracy In Milling And Using Rapid Prototyping For Die Manufacturing , Parag Gupta

Retrospective Theses and Dissertations

The end milling process is used extensively in a gamut of manufacturing areas. It accounts for up to 40% of the cost of fabrication of non-electrical parts for a high performance aircraft. This economically justifies the effort to find ways to reduce inaccuracy caused in milling by workpiece deformation, fixture deflection and cutter deflection to improve the quality of parts. The process is also used extensively for roughing and finishing of dies. However, the conventional die manufacturing process, which uses the milling process, is too time consuming because of the extensive CNC programming involved. Furthermore skilled labor required for CNC ...


Bubble And Elutriation Control In Fluidized Beds With Electric Fields , Jiun-Shen Wang Jan 1995

Bubble And Elutriation Control In Fluidized Beds With Electric Fields , Jiun-Shen Wang

Retrospective Theses and Dissertations

The mechanisms for controlling elutriation and bubbling effect in a fluidized bed are largely unexplored. Increased understanding of these hydrodynamic effects will help to improve both fluidized bed design and operation;In the present study, an electric field was used as an independent parameter to control the formation of bubbles and the elutriation of fines in a fluidized bed. Various forces which acted on the particles were compared. It was concluded that both the current constriction force and hydrodynamic force dominated the behavior of the bed;The bed expansion increased as much as 15% of the bed height at the ...


Dynamics And Controls For Robot Manipulators With Open And Closed Kinematic Chain Mechanisms , Sam-Sang You Jan 1994

Dynamics And Controls For Robot Manipulators With Open And Closed Kinematic Chain Mechanisms , Sam-Sang You

Retrospective Theses and Dissertations

This dissertation deals with dynamics and controls for robot manipulators with open and closed kinematic chain mechanisms;Part I of this dissertation considers the problem of designing a class of robust algorithms for the trajectory tracking control of unconstrained single robot manipulator. The general control structure consists of two parts: The nominal control laws are first introduced to stabilize the system in the absence of uncertainties, then a class of robust nonlinear control laws are adopted to compensate for both the structured uncertainties and the unstructured uncertainties by using deterministic approach. The possible upper bounds of uncertainties are assumed to ...


Automatic Programming Of Arc Welding Robots , Srikanth Padmanabhan Jan 1991

Automatic Programming Of Arc Welding Robots , Srikanth Padmanabhan

Retrospective Theses and Dissertations

Automatic programming of arc welding robots requires the geometric description of a part from a solid modeling system, expert weld process knowledge and the kinematic arrangement of the robot and positioner automatically. Current commercial solid modelers are incapable of storing explicitly product and process definitions of weld features. This work presents a paradigm to develop a computer-aided engineering environment that supports complete weld feature information in a solid model and create an automatic programming system for robotic arc welding;In the first part, welding features are treated as properties or attributes of an object, features which are portions of the ...