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Full-Text Articles in Engineering

Cumulative Average Pricing Method For Estimating Average Service Life, Mahendra Babu Hosangadi Dec 1995

Cumulative Average Pricing Method For Estimating Average Service Life, Mahendra Babu Hosangadi

Master's Theses

The study determined if accuracy of estimation of retirement price of industrial equipment was affected by using a cumulative average pricing (CAP) method at varying conditions of inflation rate, service life, and life characteristics. The study also determined the accuracy of estimating the average life of unaged data by simulated plant record (SPR) method. Thirty-six experiments were conducted at varying conditions of inflation rate, curve type and average life. The study was conducted for two left modal curves, two symmetrical modal curves and two right modal curves at 20 and 40 years average life using three different inflation rates: 3 ...


Addition Of Automatic Dimensioning Feature To D-M-E’S Ultimate Mold Base Design Software, Cori L. Brown Aug 1995

Addition Of Automatic Dimensioning Feature To D-M-E’S Ultimate Mold Base Design Software, Cori L. Brown

Master's Theses

There have been many improvements in the plastics industry over the past few years. One of these areas is in the design of injection molds. This area has been enhanced by the use of Computer-Aided Design systems and furthered by the creation of specialized mold design software. The Ultimate® design system from D-M-E has made a mold designer's job much easier by automating much of this process. This project extends the function of this software by adding an automatic dimensioning feature that will make the mold design process less tedious and less time consuming. This addition will also standardize ...


Development Of A Mold Trial Procedure For Establishing A Robust Process, Marc R. Vander Kooi Aug 1995

Development Of A Mold Trial Procedure For Establishing A Robust Process, Marc R. Vander Kooi

Master's Theses

To reduce variation in the injection molding process it is essential to understand the effect of process, mold, and material variables on critical part characteristics. Gaining a thorough understanding of these variables is often difficult due to the limited time manufacturers typically have available for mold trials. To address this issue, the Premier Class Injection Molding consortium (PCIM) has performed numerous experiments relating to shot-to-shot repeatability. Using the PCIM data set and experimentation procedures as a base, a procedure was developed to collect data during a mold trial. Incorporating small experiments and statistical analysis, the new procedure allows meaningful data ...


Analysis Of A Design For Its Quality Manufacturability In Terms Of Misalignments And Fastener Related Problems, Abhinav Dhar May 1995

Analysis Of A Design For Its Quality Manufacturability In Terms Of Misalignments And Fastener Related Problems, Abhinav Dhar

Theses

This study analyzes the relationship between design parameters established at the initial stage of the design process and the manufacturing quality problems that manifest themselves during production. Specifically, we study the relationship between design features and the occurrence of misalignment defects and fastener related problems.

This outcome of this work is a methodology, Design for Quality Manufacturability (DFQM). DFQM addresses the likelihood that defects will occur during the manufacture of a product in a standard plant. This is based on the premise that defects in assembled products are often influenced by some features of the design and/or assembly process ...


Design Of Developmental Test Programs For One-Shot Systems With Two State Reliability , Mu-Yeh Huang Jan 1995

Design Of Developmental Test Programs For One-Shot Systems With Two State Reliability , Mu-Yeh Huang

Retrospective Theses and Dissertations

This dissertation considers efficient developmental testing for one-shot systems (for example, missiles) that are destroyed in testing or first normal use, where there is the possibility of "reliability growth" of the basic system design as a result of redesigns following failed developmental tests. We consider situations where the cost of redesign is negligible and there is a fixed procurement budget covering both system development and purchase, each developmental test produces either a binary (success-failure) or a continuous outcome. The analysis offered here is intended as an answer to the question "How much testing is enough?" posed by Seglie (1992) in ...


Dimensions Of Flexibility In Apparel Production , Heidi Patricia Scheller Jan 1995

Dimensions Of Flexibility In Apparel Production , Heidi Patricia Scheller

Retrospective Theses and Dissertations

The purpose of this study was to inductively describe dimensions of flexibility in apparel manufacturing. Using qualitative methods, 38 interviews of apparel production consultants and managers were conducted in a variety of settings throughout the United States and in Honduras. Eighteen apparel production plants were toured. Attendance at two apparel research centers, three apparel production seminars, an apparel research conference, and a major apparel production trade show contributed to the study in the form of knowledge, documents, introductions to informants, and observations of apparel production equipment and techniques. Sales of the referent apparel firms ranged from 2.5 million to ...


Investigation Of The Relationship Between Fuel Injection Nozzle Roto Flow And Hydra Flow And The Engine Torque Of A Diesel Engine, Guang Jin Jan 1995

Investigation Of The Relationship Between Fuel Injection Nozzle Roto Flow And Hydra Flow And The Engine Torque Of A Diesel Engine, Guang Jin

Dissertations and Theses @ UNI

The purpose of this study was to investigate the possibility of reducing diesel engine torque variation by optimizing fuel injection nozzle tip configuration. In order to reduce engine torque variation, test runs were conducted to determine whether fuel injection nozzles affected diesel engine torque. There was a further effort to determine whether a correlation existed between the fuel injection nozzle roto flow and hydra flow, and the engine torque at specified engine speeds.

Engines installed in cotton pickers and tractors were used for this study. Engines, five from the cotton picker and five from the tractor group were chosen randomly ...


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 ...


Characterization Of Surface Profiles Using Discrete Measurement Systems , Tai-Hung Yang Jan 1995

Characterization Of Surface Profiles Using Discrete Measurement Systems , Tai-Hung Yang

Retrospective Theses and Dissertations

Form error estimation techniques based on discrete point measurements can lead to significant errors in form tolerance evaluation. By modeling surface profiles as random variables, we are able to show how sample size and fitting techniques affect form error estimation. Depending on the surface characteristics, typical sampling techniques can result in estimation errors of as much as 50%;We investigate current available interpolation procedures. Kriging is an optimal interpolation for spatial data when the model of variogram is known a priori. Due to the difficulty in identifying the correct variogram model from the limited sampled data and lack of complete ...


Market-Based Allocation Mechanisms For Lot-Size Decision Makers And Electric Power Utilities , Cheng-Kang Chen Jan 1995

Market-Based Allocation Mechanisms For Lot-Size Decision Makers And Electric Power Utilities , Cheng-Kang Chen

Retrospective Theses and Dissertations

The objective of this dissertation is to investigate how lot-size decision makers and electric power utilities determine critical economic quantities (e.g., the order quantities for the lot-size decision makers and the transmission service charges for the electric power utilities). A primary motivation of this study is to improve the economic efficiency (often measured in terms of cost saving) for lot-size decision makers and electric power utilities;For lot-size decision makers, we extend the traditional economic order quantity (EOQ) model by considering various aspects of model environments such as pricing policies. First, we investigate the inventory and disposal policies for ...


The Development And Testing Of New, Single And Multiple Echelon, Dynamic, Capacitated, Lot Sizing Heuristics , Robert Jay Mccoy Jan 1995

The Development And Testing Of New, Single And Multiple Echelon, Dynamic, Capacitated, Lot Sizing Heuristics , Robert Jay Mccoy

Retrospective Theses and Dissertations

Three new heuristics and two random problem generators are introduced and tested. These heuristics and problem generators are associated with single and multiple echelon, dynamic, capacitated lot sizing problems, with or without setup times. These types of problems often occur in an MRP environment;First, the Dixon and Silver (DS) lot sizing heuristic was extended. The new, single echelon heuristic offers improved cost performance at a small computational expense. It incorporates newly developed perturbation factors that allow for multiple iterations of the DS heuristic. At the conclusion of all iterations, the lowest cost production plan is recalled. The second, single ...


The Lrt Method Of Constructing A Two-Sided "Variables" Acceptance Region And Its Comparison With Other Methods , Ding-Hwa Lei Jan 1995

The Lrt Method Of Constructing A Two-Sided "Variables" Acceptance Region And Its Comparison With Other Methods , Ding-Hwa Lei

Retrospective Theses and Dissertations

W. A. Wallis1 proposed a method for constructing a two-sided variables acceptance sampling plan under the assumption that a quality characteristic of interest, X, has a normal distribution. This method has been introduced in some books, such as Schilling2, as an illustration of a two-sided variables acceptance sampling plan. George J. Resnikoff3 suggested another two-sided acceptance sampling plan based on the Uniformly Minimum-Variance Unbiased Estimator (UMVUE) of the fraction outside of specifications. The UMVUE method has long been used in U.S. Military Standards, and prescribed by the American National Standards Institute (ANSI) and the International Organization for Standardization (ISO ...


Manufacturing Cell Formation In A Fuzzy Environment , Chang-Chun Tsai Jan 1995

Manufacturing Cell Formation In A Fuzzy Environment , Chang-Chun Tsai

Retrospective Theses and Dissertations

The main objective of this study is to develop useful mathematical programming (FMP) models to solve cell formation (CF) problems in fuzzy environments. The dissertation was divided into three major parts. First, two mathematical programming models were developed to formulate the cell formation problems under consideration. The first model was a linear programming (LP) model for grouping parts and machines simultaneously into cells and solving the CF problem for dealing with exceptional elements (EEs). In second, a goal programming (GP) model to obtain a trade off between minimizing total cost of dealing with EEs and maximizing GE, a new similarity ...


The Development And Application Of A Demand-Based Scheduling Heuristic For Paper Cutting Processes, Robert D. Mallon Jan 1995

The Development And Application Of A Demand-Based Scheduling Heuristic For Paper Cutting Processes, Robert D. Mallon

Theses and Dissertations

No abstract provided.


Manufacturing Process Analysis Of Ag/Pd Thick Film Conductor Circuits, Yen-Chang Tseng Jan 1995

Manufacturing Process Analysis Of Ag/Pd Thick Film Conductor Circuits, Yen-Chang Tseng

Theses and Dissertations

No abstract provided.


Neural Network Modelling Of Vehicle Interior Design Package, Deepak R. Garg Jan 1995

Neural Network Modelling Of Vehicle Interior Design Package, Deepak R. Garg

Theses and Dissertations

No abstract provided.


Software Design Of A Cell Controller For A Flexible Manufacturing System, Diane F. Livingston Jan 1995

Software Design Of A Cell Controller For A Flexible Manufacturing System, Diane F. Livingston

Theses and Dissertations

No abstract provided.


A Nonlinear Dynamic Method For Supporting Large-Scale Decision-Making In Uncertain Environments, Wayne Woodhams Jan 1995

A Nonlinear Dynamic Method For Supporting Large-Scale Decision-Making In Uncertain Environments, Wayne Woodhams

Engineering Management & Systems Engineering Theses & Dissertations

This research developed a methodology for supporting decision making by reducing uncertainty in decision environments which are too large, dynamic and complex to be treated by traditional quantitative and simulation techniques. These environments are complex because of the free choice associated with human involvement, and the existence of a large number of interrelated factors which influence the outcomes of the decision process. They are dynamic because the ground rules affecting those interrelationships are constantly changing. Uncertainty cannot be treated probabilistically, since identification of a full set of outcomes and factors of influence is not possible.

The venue for the investigation ...


Comparing Traditional Statistical Models With Neural Network Models: The Case Of The Relation Of Human Performance Factors To The Outcomes Of Military Combat, William Oliver Hedgepeth Jan 1995

Comparing Traditional Statistical Models With Neural Network Models: The Case Of The Relation Of Human Performance Factors To The Outcomes Of Military Combat, William Oliver Hedgepeth

Engineering Management & Systems Engineering Theses & Dissertations

Statistics and neural networks are analytical methods used to learn about observed experience. Both the statistician and neural network researcher develop and analyze data sets, draw relevant conclusions, and validate the conclusions. They also share in the challenge of creating accurate predictions of future events with noisy data.

Both analytical methods are investigated. This is accomplished by examining the veridicality of both with real system data. The real system used in this project is a database of 400 years of historical military combat. The relationships among the variables represented in this database are recognized as being hypercomplex and nonlinear.

The ...