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Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

In-Process Tool Condition Monitoring Systems In Cnc Turning Operations , Soo-Yen Lee Jan 2006

In-Process Tool Condition Monitoring Systems In Cnc Turning Operations , Soo-Yen Lee

Retrospective Theses and Dissertations

The present study shows the development of in-process tool condition monitoring systems utilizing signal decomposition technique, statistical data analysis, and artificial neural networks system. Two systems; (1) the system based on the multiple regression, (2) the system based on artificial neural networks with back-propagation learning algorithms were developed;The raw signals obtained from two sensors (tri-axial accelerometer and AE sensor) with different machining parameters and tool conditions were examined and decomposed into six components by utilizing a wavelet transformation. The most significant components of each signal were found by statistical method and implemented to develop two in-process tool monitoring systems ...


Statistical Analysis Of Safety And Health Issues , Qi Jiang Jan 2006

Statistical Analysis Of Safety And Health Issues , Qi Jiang

Retrospective Theses and Dissertations

Statistical analysis is an essential tool in safety and health research. This thesis is composed of statistical analyses for three different types of safety and health projects: power-take-off entanglements, farm stress, and heart problems and diabetes, in additional the related statistical issues are discussed;In the power-take-off entanglements project, an experimental design was used to study the risk of entanglement in power-take-off driveline. The response variable was a binary variable indicating whether a dangerous "entanglement" occurred or not. The experimental factors were angle of introduction, length of specimen, and type (stiffness) of material. The main conclusion was that the entanglement ...


In-Process Pokayoke Development In Multiple Automatic Manufacturing Processes , Zhe Zhang Jan 2005

In-Process Pokayoke Development In Multiple Automatic Manufacturing Processes , Zhe Zhang

Retrospective Theses and Dissertations

In this dissertation, three in-process pokayoke systems were developed to prevent defects from occurring, so as to ensure product quality for three automated manufacturing processes.;The first pokayoke development resulted in an in-process, gap-caused flash monitoring (IGFM) system for injection-molding machines. An accelerometer sensor was integrated in the proposed system to detect the difference of the vibration signals between flash and non-flash products. By sub-grouping every two consecutive molded parts with the vibration signal, the online statistical process control (OLSPC) was able to monitor 100% of the molded products. The threshold of this system established by the SPC approach can ...


Integrating Cad Files And Automatic Assembly Sequence Planning , Chunxia Pan Jan 2005

Integrating Cad Files And Automatic Assembly Sequence Planning , Chunxia Pan

Retrospective Theses and Dissertations

In this research study, a fully automated assembly sequence planner was developed, which automatically extracts geometrical information directly from STEP CAD files and then generates feasible assembly sequences with minimum assembly direction reorientations. The effectiveness of using the planner to reduce assembly time was also verified. The research study included three parts;In the first part of the research study, algorithms and software were developed for extracting geometrical information contained in STEP CAD files and for detecting potential collisions between parts during assembly along principal-axis assembly directions, based upon the extracted geometrical information. The developed software directly takes a STEP ...


Using Microwave Doppler Radar In Automated Manufacturing Applications , Gregory C. Smith Jan 2004

Using Microwave Doppler Radar In Automated Manufacturing Applications , Gregory C. Smith

Retrospective Theses and Dissertations

Since the beginning of the Industrial Revolution, manufacturers worldwide have used automation to improve productivity, gain market share, and meet growing or changing consumer demand for manufactured products. To stimulate further industrial productivity, manufacturers need more advanced automation technologies: "smart" part handling systems, automated assembly machines, CNC machine tools, and industrial robots that use new sensor technologies, advanced control systems, and intelligent decision-making algorithms to "see," "hear," "feel," and "think" at the levels needed to handle complex manufacturing tasks without human intervention.;The investigator's dissertation offers three methods that could help make "smart" CNC machine tools and industrial robots ...


Theory And Prediction Of Position Error For Automated Guided Vehicles With Ultrasonic Sensing Based On Time-Of-Flight Theory , Ravindra Thamma Jan 2004

Theory And Prediction Of Position Error For Automated Guided Vehicles With Ultrasonic Sensing Based On Time-Of-Flight Theory , Ravindra Thamma

Retrospective Theses and Dissertations

Automated Guided Vehicles (AGVs) are based on a physical track system that greatly limits the ability of the AGV to adapt to changing needs. If the physical track system could be replaced with a trackless AGV, its flexibility could be greatly enhanced. For an AGV to navigate to a known position by trackless means, it should have the capability to locate its own position relative to a global position;This research utilized an ultrasonic distance measurement system based on time-off-light theory to estimate AGV triangulation position. This study also focused on an adaptive navigation and control system that would situate ...


In-Process Tool Wear Prediction System Development In End Milling Operations , Jacob Chi-Ming Chen Jan 2003

In-Process Tool Wear Prediction System Development In End Milling Operations , Jacob Chi-Ming Chen

Retrospective Theses and Dissertations

Three in-process tool wear monitoring systems have been developed in this research. They are: (1) the multiple linear regression based in-process tool wear prediction (MLR-ITWP) system; (2) the artificial neural networks based in-process tool wear prediction (ANN-ITWP) system; and (3) the statistics assisted fuzzy-nets based in-process tool wear prediction (S-FN-ITWP) system.;Before these above-mentioned systems were developed and evaluated, statistical approaches had been implemented to analyze and identify the most significant force signal for tool wearing monitoring system. This study demonstrates that the average peak cutting forces in the Y direction (the direction that is perpendicular to the table feed ...


A Neural Networks-Based In-Process Adaptive Surface Roughness Control (Nn-Iasrc) System In End-Milling Operations , Po-Tsang Bernie Huang Jan 2002

A Neural Networks-Based In-Process Adaptive Surface Roughness Control (Nn-Iasrc) System In End-Milling Operations , Po-Tsang Bernie Huang

Retrospective Theses and Dissertations

In this research, the neural networks-based in-process adaptive surface roughness control (NN-IASRC) system employing multiple cutting tools was successfully developed for end-milling operations. The dynamometer sensor was used to monitor the uncontrolled cutting tool conditions to increase the accuracy of the surface roughness control. An empirical approach was applied to discover the proper cutting force signals, the average resultant peak force in XY plane ( Fap) and the absolute average force in the Z direction (Faz). These two forces were employed to represent the uncontrollable cutting tool conditions for surface roughness control. A statistical method was employed to verify that the ...


Development Of A Fuzzy-Nets Based Adapted Surface Roughness Control (Fnasrc) System In End-Milling Operations , Lieh-Dai Yang Jan 2002

Development Of A Fuzzy-Nets Based Adapted Surface Roughness Control (Fnasrc) System In End-Milling Operations , Lieh-Dai Yang

Retrospective Theses and Dissertations

A fuzzy-nets based in-process adaptive surface roughness control (FNASRC) system was developed in this research. The FNASRC system was able to adapt cutting parameters in-process and in a real time fashion to improve the surface roughness of machined parts when the surface roughness quality was not meeting customer requirements in the end milling operations. The FNASRC system was comprised of two sub-systems: (a) in-process surface roughness recognition (IPSRR); and (b) fuzzy-nets adaptive feed rate control (FNAFRC).;Two IPSRR sub-systems with different theories were developed and evaluated in this study. First, a multiple linear regression based in-process surface roughness recognition system ...


The Development Of In-Process Surface Roughness Prediction Systems In Turning Operation Using Accelerometer , Hanming Huang Jan 2001

The Development Of In-Process Surface Roughness Prediction Systems In Turning Operation Using Accelerometer , Hanming Huang

Retrospective Theses and Dissertations

Three in-process surface roughness prediction (ISRP) systems using linear multiple regression, fuzzy logic, and fuzzy nets algorisms, respectively, were developed to allow the prediction of real time surface roughness of a work piece on a turning operation. The surface roughness is predicted from feed rate, spindle speed, depth of cut, and machining vibration that is detected and collected by an accelerometer.;Two groups of data were collected for two cutters with nose radii of 0.016 and 0.031 inches, respective. A total of 162 training data sets and 54 testing data sets for each cutter were applied to train ...


Multilevel On-Line Surface Roughness Recognition System In End Milling Operation , Mandara Deroy Savage Jan 1999

Multilevel On-Line Surface Roughness Recognition System In End Milling Operation , Mandara Deroy Savage

Retrospective Theses and Dissertations

The use of computer numerically controlled (CNC) machines has become more widespread and as more machining centers are operating unattended, the need for a Smart CNC machine for on-line tool and process monitoring has become critical. An accurate and reliable method of providing real-time information is vital to the continued integration of adaptive control systems (ACS) with machine tools. ACSs are being developed to monitor parameters like tool wear through current sensing, tool breakage from cutting force signals, and tool chatter from vibration signals. These adaptive control systems' capabilities can be broadened to monitor and control various surface quality parameters ...


Quality Program Induced Change: Its Impact On Stress, Fear And Anxiety , Chester Douglas Ward Jan 1999

Quality Program Induced Change: Its Impact On Stress, Fear And Anxiety , Chester Douglas Ward

Retrospective Theses and Dissertations

Organizational change has historically been a stimulus for increased fear/anxiety. A precept of quality movement intervention, as conceived by Deming (1986)1 is that if the intervention is properly implemented there will be less fear within the organization. This investigation assesses the impact of level of quality program implementation, sex, years of employment (tenure), years of formal education, organization size, individual's age and job type on the level of fear/anxiety within the studied organizations. The level of quality program implementation was determined using an instrument developed for the purposes of this study. Fear/anxiety were assumed to ...


A Study To Ascertain The Viability Of Ultrasonic Nondestructive Testing To Determine The Mechanical Characteristics Of Wood/Agricultural Hardboards With Soybean Based Adhesives , Charles Raymond Colen Jr. Jan 1998

A Study To Ascertain The Viability Of Ultrasonic Nondestructive Testing To Determine The Mechanical Characteristics Of Wood/Agricultural Hardboards With Soybean Based Adhesives , Charles Raymond Colen Jr.

Retrospective Theses and Dissertations

There have been numerous studies with ultrasonic nondestructive testing and wood fiber composites. The problem of the study was to ascertain whether ultrasonic nondestructive testing can be used in place of destructive testing to obtain the modulus of elasticity (MOE) of the wood/agricultural material with comparable results. The uniqueness of this research is that it addressed the type of content (cornstalks and switchgrass) being used with the wood fibers and the type of adhesives (soybean-based) associated with the production of these composite materials;Two research questions were addressed in the study. The major objective was to determine if one ...


Benchmarking The Implementation Of Total Quality Management And Customer Satisfaction In General Automotive Repair Shops In Iowa , Hsiu-Te Sung Jan 1998

Benchmarking The Implementation Of Total Quality Management And Customer Satisfaction In General Automotive Repair Shops In Iowa , Hsiu-Te Sung

Retrospective Theses and Dissertations

The automotive repair industry was perceived by the American customers as an industry with high cost and low customer satisfaction. The purpose of this study was to identify the relationship between the level of total quality management (TQM) implementation and the level of customer satisfaction in the general automotive repair shops in Iowa. This information promised to enable the general automotive repair shops to increase service quality and customer satisfaction;A Total Quality System Implementation Assessment Instrument (TQSIAI) with 35 items was developed to measure the level of TQM implementation in the general automotive repair shops. A Customer Satisfaction Assessment ...


Natural Language And Mixed Modality Task Presentations In The Human-Computer Interaction Using Programmable Logic Controllers , John Robert Wright Jr. Jan 1998

Natural Language And Mixed Modality Task Presentations In The Human-Computer Interaction Using Programmable Logic Controllers , John Robert Wright Jr.

Retrospective Theses and Dissertations

This dissertation focuses on the human-computer interaction elements of task presentation and task structure in the programming of Programmable Logic Controllers (PLCs). Task presentation methods that were explored included a natural language (GE Fanuc's State Logic), and a mixed modality language (GE Fanuc's Logicmaster Relay Ladder Logic). Task Structure elements utilized in this study were linear procedural tasks and conditional branching tasks;A two-level factorial analysis of covariance determined that task presentation was a significant contributor to programming development times. Task structure and the interaction between task presentation and task structure did not yield significant p-values at the ...


An Investigation Of The Factors Affecting Dot Gain On Sheet-Fed Offset Lithography Presses , Yung-Cheng Hsieh Jan 1997

An Investigation Of The Factors Affecting Dot Gain On Sheet-Fed Offset Lithography Presses , Yung-Cheng Hsieh

Retrospective Theses and Dissertations

Dot gain has been recognized as one of the most significant factors affecting offset printing quality. Since it is not possible to entirely eliminate dot gain, better control of this problem is one of the goals of this study. The main purposes of this study were (1) to identify the most important factors that influence the percentage of "on press" dot gain using the sheet-fed offset lithography press, and (2) to establish optimum process operating conditions so that the minimum yield of dot gain size utilizing the Heidelberg GTO could be obtained;A randomized 24 factorial experiment was conducted in ...


Development Of Four In-Process Surface Recognition Systems To Predict Surface Roughness In End Milling , Shi-Jer Lou Jan 1997

Development Of Four In-Process Surface Recognition Systems To Predict Surface Roughness In End Milling , Shi-Jer Lou

Retrospective Theses and Dissertations

Surface roughness is one of the important factors in tribology and in evaluating the quality of machining operations. To realize full automation and achieve zero defect production, an effective technique is needed for on-line, real-time monitoring of surface roughness during machining. An in-process surface recognition system (ISRS), was developed for predicting real-time surface roughness, Ra, in end-milling operations. The parameters are spindle speed, feed rate, depth of cut, and the cutting, vibration between tool and workpiece. The cutting vibration is measured by an accelerometer and a proximity sensor;The analyses of the data and the ISRS building model are carried ...


The Fuzzy-Nets Based Approach In Predicting The Cutting Power Of End Milling Operations , Chuan-Teh Chang Jan 1997

The Fuzzy-Nets Based Approach In Predicting The Cutting Power Of End Milling Operations , Chuan-Teh Chang

Retrospective Theses and Dissertations

Process planning is a major determinant of manufacturing cost. The selection of machining parameters is an important element of process planning. The development of a utility to show the cutting power on-line would be helpful to programmers and process planners in selecting machining parameters. The relationship between the cutting power and the machining parameters is nonlinear. Presently there is no accurate or simple algorithm to calculate the required cutting power for a selected set of parameters. Although machining data handbooks, machinability data systems, and machining databases have been developed to recommend machining parameters for efficient machining, they are basically for ...


Self-Reported Measures Of Work Satisfaction, Receptivity Towards Organizational Change, And Ratings Of Quality Management Initiatives Of Campus Facilities' Workers In The State Universities Of Iowa , Radhakrishnan Balamuralikrishna Jan 1997

Self-Reported Measures Of Work Satisfaction, Receptivity Towards Organizational Change, And Ratings Of Quality Management Initiatives Of Campus Facilities' Workers In The State Universities Of Iowa , Radhakrishnan Balamuralikrishna

Retrospective Theses and Dissertations

Faced with increasing budgetary constraints, higher educational institutions across the United States are attempting to transform their organizational systems and processes. Quality management initiatives have become increasingly popular in several functions of universities and four-year colleges. In particular, campus facilities' departments have adopted total quality management (TQM) as the new Philosophy;;The major purpose of this study was to develop an instrument to measure job satisfaction, receptivity towards organizational change, and ratings of quality management initiatives as perceived by custodial workers employed in university campus facilities. A secondary purpose was to determine existing perceptions of custodial workers employed by the ...


Tqm Comes To The Carter Company: A Case Study Of Quality Improvement Teams In A Total Quality Management Initiative In A Mid-Sized Manufacturing Company , James William Teegarden Jan 1996

Tqm Comes To The Carter Company: A Case Study Of Quality Improvement Teams In A Total Quality Management Initiative In A Mid-Sized Manufacturing Company , James William Teegarden

Retrospective Theses and Dissertations

This study examines a Total Quality Management (TQM) initiative in which cross functional quality improvement teams were a key element. The study was conducted in a mid-sized manufacturing company located in the Midwest, using a qualitative research paradigm, during the spring and summer of 1995. The Carter Company (a pseudonym) had started the TQM initiative 24 months before the study began;Information about the Carter Company's TQM initiative was obtained through interviews with the management group, with members of two cross functional quality improvement teams, and with groups of employees who had not been members of a cross functional ...


Development Of An Instrument To Measure The Levels Of Total Quality Management (Tqm) Implementation In Manufacturing Organizations , Jai Woo Hong Jan 1993

Development Of An Instrument To Measure The Levels Of Total Quality Management (Tqm) Implementation In Manufacturing Organizations , Jai Woo Hong

Retrospective Theses and Dissertations

This study was conducted to develop a reliable instrument to measure employees' perceptions regarding the Total Quality Management (TQM) practices in manufacturing organizations. The Total Quality Management Profile (TQMP) was developed on a review of the literature and based on a panel of experts justifications and recommendations. Among the independent variables examined were different sizes of companies and different lengths of exposure to TQM;The findings of the study revealed that: (1) employees of medium companies have the most positive perceptions toward the current practices regarding continuous improvement efforts, (2) employees of small companies have the most positive perceptions toward ...


Analysis Of Time-Gap Distributions By Utilizing The Statistical Process Control Concept , Sang-Jin Park Jan 1993

Analysis Of Time-Gap Distributions By Utilizing The Statistical Process Control Concept , Sang-Jin Park

Retrospective Theses and Dissertations

This study employed the statistical process control technique to identify high-risk intersections at each time period. The method of this study consisted of three phases. The first phase of the study measured the lateral time gap used by drivers entering a major road stream of traffic from a minor street controlled by a stop sign. The second phase of the study analyzed and interpreted the time-gap data using statistical process control methods. The third phase of the study reported high-risk intersections at each time period and attempted to identify significant factors affecting the selection of time gaps;A total of ...


An Expert Fuzzy Logic Controller Employing Adaptive Learning For Servo Systems , Zong-Mu Yeh Jan 1992

An Expert Fuzzy Logic Controller Employing Adaptive Learning For Servo Systems , Zong-Mu Yeh

Retrospective Theses and Dissertations

An expert fuzzy logic controller with adaptive learning is proposed as an intelligent controller for servo systems. A key component of this controller is an adaptive learning mechanism which is used to self-regulate the scaling factors and the control action based on the error between the desired value and the plant output. The inference engine of this controller is based on the principle of approximate reasoning and the learning strategy is based on reinforcement learning. A novel approach of model reference adaptive control is also proposed for servo systems. The comparison of the performance between the proposed controller and PID ...


Optimization Of Processing Parameters Of Poly (2-Hydroxyethyl Methacrylate) For Embryo Culture Chambers, Monawar Hussain Jan 1991

Optimization Of Processing Parameters Of Poly (2-Hydroxyethyl Methacrylate) For Embryo Culture Chambers, Monawar Hussain

Retrospective Theses and Dissertations

No abstract provided.


The Development Of A Mathematical Model For Technology Transfer Potential: A Manufacturing Industry Case , Laode M. Kamaluddin Jan 1991

The Development Of A Mathematical Model For Technology Transfer Potential: A Manufacturing Industry Case , Laode M. Kamaluddin

Retrospective Theses and Dissertations

A mathematical model was developed to measure the degree of technology in a given country or countries. The model is based on the regression analysis incorporating a taxonomic method to measure the difference of technological development within a group of countries. Simple linear regression analysis was employed to identify the independent variables showing the strongest relationship to the dependent variable. These variables were then used in controlled studies to investigate causal relationships, i.e., to identify the importance of the technological characteristics influencing the technological level. Second, the independent variables most influencing the dependent variable were selected using the all-regression ...


The Effects Of The Processing Parameters On The Laser Machining Of A Green China Ceramic , Sam Nerone Ramrattan Jan 1989

The Effects Of The Processing Parameters On The Laser Machining Of A Green China Ceramic , Sam Nerone Ramrattan

Retrospective Theses and Dissertations

The purpose of this study was to investigate the quality of the cut, the thickness of the heat-affected zone, and the amount of dross produced by laser cutting green china ceramics;This study seeks an alternative method to cut greenware, which will reduce the high rate of defect found in conventional punching and trimming. The study was centered on laser cutting and in any machining process the surface properties of the material were considered. This study provides the processing parameters relating to one type of china greenware, but the information gathered will be important in the development of any new ...


University And Industry Research Relationships And Interactions, Scott Duran Mitchell Jan 1986

University And Industry Research Relationships And Interactions, Scott Duran Mitchell

Retrospective Theses and Dissertations

No abstract provided.


Four Factors Affecting Displaced Workers Being Retrained In The Area Schools Of Iowa, Aldee Holleman Jan 1985

Four Factors Affecting Displaced Workers Being Retrained In The Area Schools Of Iowa, Aldee Holleman

Retrospective Theses and Dissertations

No abstract provided.