Engineering Commons^™

Development Of A Classification And Coding System For Computer-Aided Process Planning, Shilpan K. Patel

Theses

The chore of this work was to develop a Group Technology Classification Code which can represent the full gamut of simple, rotational parts. The automated coding plan is developed to alleviate the endeavor of the process planner to plan the tasks related to the manufacturing of a specific part. The 15 digits were devised from the Japanese KK-3 Classification and Coding system. The KK-3 System contains 21 digits. Our aim is to minimize the code length, and concurrently to eliminate the redundancies. As a result, a 15 digit G.T. Code is created. The proposed plan also generates the operation logic …

Dynamic Analysis Of The Generalized Slider Crank, Sahidur Rahman

Theses

A numerical technique is used to analyze the kinematics of the generalized slider crank mechanism and an analytical technique to derive dynamic force equations for that mechanism has been formulated. The numerical technique used for displacement analysis is based on a combination of Newton-Raphson and Davidon-Fletcher-Powell optimization algorithm using dual-number coordinate-transformation matrices. Velocity analysis is performed by using a dual number method. Finally, dynamic force analysis is accomplished on the basis of the dual-Euler equation and D'Alembert's principle. The approach is developed in such a manner that a digital computer can detect when a solution is possible and then solve …

Petri Net Modeling And Analysis Of An Fms Cell, Paresh A. Patel

Theses

Petri nets have evolved into a powerful tool for the modeling, analysis and design of asynchronous, concurrent systems. This thesis presents the modeling and analysis of a flexible manufacturing system (FMS) cell using Petri nets. In order to improve the productivity of such systems, the building of mathematical models is a crucial step.

In this thesis, the theory and application of Petri nets are presented with emphasis on their application to the modeling and analysis of practical automated manufacturing systems. The theory of Petri nets includes their basic notation and properties. In order to illustrate how a Petri net with …

Off-Line Programming Using Igrip, Narahari K. Bhandary

Theses

AT&T's FWS-200 (Flexible Work Station) has been modeled and simulated to implement Off-Line Programming (OLP). IGRIP (Interactive Graphics Robot Instruction Program) from Deneb Robotics, Inc. has been used to simulate the FWS operation.

A GSL(Graphics Simulation Language) program has been used to simulate the chip placements during PCB assembly. The program leads the user through the motions of chip placement, and after the simulation run downloads the motion sequence to the FWS. The animation sequences of the FWS have been downloaded to the FWS on the Factory Floor using a C program, which is utilized to communicate the data to …

Implementation Of Automated Assembly, Kang H. Kong

Theses

Research has shown that about 60 - 80% wealth producing activities is related to manufacturing in major industrial countries.

Increased competition in industry has resulted in a greater emphasis on using automation to improve productivity and quality and also to reduce cost.

Most of the manufacturing works such as machining, painting, storage, retrieval, inspection and transportation have changed to automation successfully, except assembly. Manual assembly is predominant over automatic assembly techniques due to inherent assembly problem and the fact that the assembly machines lack the innate intelligence of human operator and lack sufficient flexibility to changeover when product designs and …

Size Reduction Of Polymeric Particulates By Jet Milling, Cheng Hua

Theses

A basic theory for the size reduction operation by jet milling has been developed.

Typical samples of feedstock have been analyzed using screen analysis to determine the initial distribution of polymeric particulate sizes prior to jet milling.

A statistical theory .was developed using probabilities to represent the likelihood that specific size reductions would occur. These probabilities include the effects of various equipment.

The theory was then used to predict the distribution of polymeric particulate sizes after jet milling. The agreement between the predictions and actual results was within 5 %.

Encouraged by the successful work of the simulation of the …

Design For Manufacturability, Kocherlakota Sreedhar

Theses

Design for Manufacturability represents a new awareness of the importance of design as the first manufacturing step. It recognizes that a company cannot meet all its objectives with isolated design and manufacturing operations. The Design for Manufacturability approach embodies certain underlying imperatives that help maintain communication between all components of the Manufacturing and Design system and permit flexibility to adopt and to modify design during each stage of the product realization. Design for Manufacturability cannot be bought or sold and it should be implemented by management. Complete support of management to the implementation is very important to the success of …

Design For Manufacturability : Re-Design Of Pencil Sharpener For The Ease Of Assembly, Amit R. Rathod

Theses

A Design For Manufacturability (DFM) approach is used to analyze the existing design of a pencil sharpener, and to reduce and re-design the parts of pencil sharpener for the ease of assembly. The procedure for the selection of a suitable and economical assembly method is based on the Boothroyd and Dewhurst methods. Analysis of the initial design for manual assembly and re-design for automatic as well as manual assembly is presented. An algorithmic approach for simplified generation of all mechanical assembly sequences and selection of the assembly sequences is presented using De Fazio and Whitney approach.

Analysis Of The Influence Of Natural Wear And Tear In Gates And Runners On The Filling Of A Balanced Multi-Cavity Injection Mold, Ranga Reddy V. Adavelly

Theses

Design of injection molds is outmost important in the manufacture of parts. Its components runners and gates significantly influence the mold filling. Using a simulation package for injection molding a balanced multi-cavity mold was designed. Wear in the gates of runner was simulated by varying the cross-sectional area of the components. Influence of wear of tear in gates of runners on mold filling was measured in terms of flow rate of time of fill. Detailed analysis is done on four different models using four different materials Polycarbonate, Polypropylene, Nylon6 and Polybutylene terephthalate. Graphical display of result is presented and analyzed …

Development Of An Adaptive Fuzzy Shell Clustering Algorithm And Validity Measures, Kurra Bhaswan

Theses

In objective functional based fuzzy clustering algorithms the weighted sum of the distances of the feature vectors from cluster prototype are minimized. The fuzzy memberships are utilized as weighing factors. The cluster prototype can be a point or a line or a plane, etc. This work extends the recent concept of using curved prototypes by utilizing the Adaptive Norm Theorem proposed by Dave¹ to develop an algorithm for the detection of fuzzy hyper-ellipsoidal shell prototypes. The Objective functional associates a norm for each cluster in which to measure the proximity of the shell prototype adaptively. The resulting implementation necessitates …

Modification Of Wear Testing Methodology, Muhammed Farooq

Theses

In this work the existing computer controlled methodology has been modified A loading and unloading mechanism has been designed, manufactured and assembled. A specimen fixture has been designed and installed. Alloy steel specimens with different surface treatment were tested on the modified wear testing machine. Operational surface roughness was measured in all stages of running-in, steady state and catastrophic wear. The difference between technological and operational surface roughness was observed. The results show that the surface treatment by Plasma Ion-Nitriding with Magnetic treatment increases wear resistance. It was found that the coated material which had been magnetically treated with a …

Computer Graphic Simulation Of Sweeping Of Solid Objects, Jr-Jyun Jang

Theses

This thesis is on the computer graphic simulation of the swept volume of a solid object undergoing Euclidean motions (including translation and rotation). The study helps visualize different types of Euclidean motions and supports the previously developed swept volume theories by providing graphic realism.Included in the thesis presentation are the following :

1. Description of Euclidean motions of polyhedral objects, using ruled surfaces to represent swept volumes.
2. Representation of sweeping of solid objects, -using parametric cubic equation and sweep differential equation.
3. Simulation of motions of PUMA and IBM robots.
4. Wire-frame and shaded image displays of swept volumes.

Numerical Simulation Of The Heating Of Glass Mat Thermoplastic (Gmt) By Combined Conduction And Dual Beam Microwave Source Terms, Shrenik Kasturi

Theses

Fabrication of parts from glass mat thermoplastic involves the heating of the composite to a temperature above the melting point of the matrix iesin to obtain a low viscosity and to allow sheets to be molded without fractui ing. The focus of this work is this heating stage, particularly the influence of a source term in the energy equation.

The solution to this physical situation is complicated by the nature of the GMT sheet, which has a layeied structure, with diffeient thermophysical properties in different layers. The use of source terms has not been reported yet. and is the piimary …

Expert System For Blown Film Extrusion, Jiachyi Li

Theses

Expert systems and blown film extrusion are two subjects to deal with in this thesis. Expert systems are an aspect of artificial intelligence, or a computer's ability to think. The determination of a suitable expert system for particular problem is an important factor in current societies. Blown film is extruded as a continuous tube which is air cooled, collapsed, and wound onto a roll as a double layer of film. Such film, if heat sealed and perforated, makes a roll of bags. There are many factors that affect blown film extrusion. Therefore, using expert system to evaluate blown film extrusion …

Application Of Expert System For Control Of Heating Distribution Network : A Case Study, Jun Li

Theses

The use of an expert system for the heating distribution network is an application of artificial intelligence to the domain of energy engineering.

The development of an expert system for a heating distribution network is explained. The expert system is implemented through the software Kee. The expert system is used to monitor the heating distribution network, and to complement some functions of the controls such as balancing the system pressure, stabilizing output, in addition to fault diagnosis, system process simulation. It serves also as a medium to system moniting, and operator training. Many other functions will be developed on the …

Implementation Of A Production Planning And Control System In A Small Manufacturing Company, Carmelo Pernice

Theses

This thesis analyzed and discussed the implementation of a production control system in a small manufacturing firm. The basic concepts of production control were provided to give insight on the methodologies typically applied in production control systems. Overviews were presented on Material Resource Planning, Capacity Planning, and Shop Floor Control, as well as any supporting methodologies and technologies.

As with any project, some investigation was done in order to choose a system which best suits the company's needs. At Teledyne Adams, The DCD Shop Floor Control System was chosen since it is capable of handling batch manufacturing as well as …

Analysis Of The Effects Of Wear And Tear Of Gates And Runners In The Injection Molding Process For Multi-Cavity Injection Molds In Natural Imbalance, Krishna Siva Rama Vellanki

Theses

Intuition, prior experience, and trial and error experimentation have previously been the key factors in solving the mold design and process optimization problems, when there is a dimensional change in gates and runners due to wear and tear in multi-cavity injection molding. The effect of wear and tear of gates and runners of circular and rectangular geometries, using the flow analysis package MOLDFLOW have been studied. A mold with two rectangular cavities of volume in the ratio 2:1 has been taken as the reference model for the analysis. It is observed that the amount of imbalance due to wear and …

Development Of Plasma Ion Nitriding Process Parameters To Increase Durability Of Machine Components, Wenge Yang

Theses

In this work glow discharge ion nitriding process was selected to increase durability of machine components. To achieve this goal, the process parameters were designed, established and optimized based on the desired surface properties. The orthogonal experiment method is used to optimize multifactors process parameters. Using the image analyzing approach the microstructure of differently treated materials were obtained and analyzed. Developed coating layers, including different nitrides such as Fe3N, Fe4N, and diffusion zone were controlled by the optimized process parameters. Analysis of the obtained microstructure and microhardness showed the improvement of surface mechanical properties. Performed wear testing experiments showed increased …

Genetic Algorithm For Solving Printed Circuit Board Assembly Planning Problems, Hermean Wong

Theses

The application of the genetic algorithm for solving the planning problems for various printed circuit board assembly machines is presented. The genetic algorithm finds the sequence of component placement/insertion and arrangement of feeders simultaneously, for achieving the shortest assembly time. Three types of assembly planning problems are modeled such that they can be solved by the genetic algorithm. The algorithm uses links (parents) to represent possible solutions and applies genetic operators to generate new links (offspring) in an iterative procedure to obtain the optimal solution. Some examples are provided to illustrate the solutions generated by the genetic algorithm, and these …

Measuring Thermostat And Air Conditioner Performance In Florida Homes, Florida Solar Energy Center, Hugh Henderson, Jr.

FSEC Energy Research Center®

This report summarizes the experimental results from 30 field tests in 23 Central Florida homes during the Summer of 1990. Detailed thermostat measurements were made at each site for a one to three day period. The purpose of this study was to determine how thermostats operate in actual buildings. This knowledge is necessary to understand the part load performance of air conditioners (ACs).

Monitored Energy Use Characteristics Of A Florida Residence: Demonstration Of A Research Monitoring Protocol, Data Acquisition System And Associated Analysis Methods, Florida Solar Energy Center, Danny Parker

FSEC Energy Research Center®

This report summarizes the first four months of data collection on the author's home in Cocoa Beach, Florida. This project was designed to develop and test a residential monitoring protocol for a cooling dominated climate. The project has demonstrated that useful research results can be obtained from the detailed monitoring of a single occupied residential home.

Ole Miss Engineer 1991

Ole Miss Engineer

No abstract provided.

Simulation Modeling In Manufacturing Cell Design, Debra A. Hunke

Opportunities for Undergraduate Research Experience Program (OURE)

The interwoven phases of the manufacturing process in Computer Integrated Manufacturing (CIM) require a carefully designed facility. Simulation modeling can be combined with other techniques to provide a rigorous methodology for CIM system design. This paper describes CIM, simulation ana their relationship. A case study demonstrates the described methodology in the design of a flexible manufacturing cell.

Simulation Of 3-D Viscous Flow Around A Nozzle-Afterbody At High Speeds, Wendy B. Hoffman

Mechanical & Aerospace Engineering Theses & Dissertations

Turbulent shear flows at supersonic and hypersonic speeds around a nozzle-afterbody are numerically simulated and investigated. The specific application is for the flow around the nozzle-afterbody of a generic hypersonic vehicle. Accurate simulation of viscous, separating flows is not an easy task, and it is complicated by turbulence modeling concerns. A main objective of this study is to numerically simulate the afterbody flowfield while addressing the turbulence modeling problem. The viscous flow considered i~ this study is characterized by three-dimensional corner flows, shock boundary layer interactions, plume flow, shear layers, and cross-flow separations. Accurate simulation of this flow requires solution …

Investigation Of Effects Of Nose Bluntness And Angle Of Attack On Slender Bodies In Viscous Hypersonic Flows, Ashwini Kumar Sehgal

Mechanical & Aerospace Engineering Theses & Dissertations

Hypersonic flows over cones and straight biconic configurations are calculated for a wide range of free stream conditions in which the gas behind the shock is treated as perfect. Effect of angle of attack and nose bluntness on these slender bodies in air is investigated extensively. The numerical procedures are based on the solution of complete Navier-Stokes equations at the nose section and parabolized Navier Stokes equations further downstream. The flow field variables and surface quantities show significant differences when the angle of attack and nose bluntness are varied. The complete flow field is thoroughly analyzed with respect to velocity, …

Finite Element Analysis Of Thermal Post-Buckling And Vibrations Of Thermally Buckled Composite Plates, Charles Clifton Gray

Mechanical & Aerospace Engineering Theses & Dissertations

The development of supersonic and hypersonic flight vehicles such as the High Speed Civil Transport and the National Aero-Space Plane has created an increased need for analysis of structures at very high temperatures. Bisplinghoff and Pian, Yang and Han, and Dokmeci and Boley have conducted experimental and analytical studies to determine the effect of elevated temperatures on the vibration characteristics of isotropic plates, Chen and Chen, and Meyers and Hyer have clone studies on thermal buckling and post-buckling of composite plates, respectively.

The thermal loads which will be imposed on the new high speed aircraft will be too great for …

Large-Amplitude Finite Element Flutter Analysis Of Composite Panels In Hypersonic Flow, Carl E. Gray Jr.

Mechanical & Aerospace Engineering Theses & Dissertations

A finite-element approach is presented for determining the nonlinear flutter characteristics of two-dimensional isotropic and three-dimensional composite laminated thin panels using the third-order-piston, transverse loading, aerodynamic theory. The unsteady, hypersonic, aerodynamic theory and the von Karman large deflection plate theory are used to formulate the aeroelastic problem. Nonlinear flutter analyses are performed to assess the influence of the higher-order aerodynamic theory on the structure's limit-cycle amplitude and the dynamic pressure of the flow velocity. A solution procedure is presented to solve the nonlinear panel flutter and large-amplitude free vibration finite element equations. This procedure is a linearized updated mode with …

Two-Dimensional Heat Loss From A Building Slab Including Convective Effects In Saturated Soil, William W. Rust Iii

Mechanical & Aerospace Engineering Theses & Dissertations

The heat loss from a building slab was investigated. The continuity equation, Darcy's Law and the energy equation were formulated to include the temperature dependence of viscosity and density of water. The governing equations and appropriate boundary conditions were transformed into dimensionless variables. A finite difference numerical scheme was constructed based on the Gauss-Seidel method by lines and solved iteratively in alternating directions. A correlation between the geometrical characteristics of the domain, the convective surface heating parameters, and the total nondimensional slab heat loss in two dimensions was discovered. Furthermore, the correlation was extended to three-dimensional slabs and produced good …

Maximum Likelihood Estimation For Distributed Parameter Models Of Large Beam-Like Structures, Ji Yao Shen

Mechanical & Aerospace Engineering Theses & Dissertations

Proposed large space structures have many characteristics that give an advantage to modeling their structural dynamics by a set of partial differential equations (PDE's). By far, the most effort put forth in studying system identification and control to date has been based on finite element models. Despite its acceptability, such lumped parameter models have inevitable deficiencies primarily because of their complexity. Both approaches are complementary and each should be used where it is most effective. But the fact is that the distributed parameter approach has not been developed to the level of maturity as for the lumped parameter approach.

Motivated …

Kinematic Synthesis Of Deployable-Foldable Truss Structures Using Graph Theory, Dirk B. Warnaar

Mechanical & Aerospace Engineering Theses & Dissertations

A graph theoretic approach is applied to the conceptual design of deployable truss structures. The characteristics that relate to the inter-connectivity of the elements of a deployable truss structure can be captured in a schematic representation, called a graph. A procedure is presented that enables the exhaustive generation of these graphs for structures of any given number of nodes and links and which are foldable onto a plane or onto a line.

A special type of truss structures, called truss modules, is presented. Graphs of this class of structures form a subset of the graphs of truss structures. Two procedures …