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1987

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

Removal Of Eucalyptus Vessel Segments Using Centrifugal Cleaners, Amnuay Ponpued Dec 1987

Removal Of Eucalyptus Vessel Segments Using Centrifugal Cleaners, Amnuay Ponpued

Master's Theses

Two commercial feedforward centrifugal cleaners were used in the study of vessel segment removal from bleached eucalyptus pulp. The reduction of vessel elements yielded a reduction of vessel pick tendency and other problems caused by vessel elements which limit the use of eucalyptus pulp in paper stock furnishes. The operating conditions of the centrifugal cleaners were evaluated for their effect on separation efficiency. Pulp loss with rejects was reduced by multiple stage separation. The Vandercook Proof Press was used to compare the picking of cleaned, original pulp and two higher-vessel-content pulps. Regression analysis and ANOVA showed significant effects of feed ...


Acuta Enews November 1987, Vol. 16, No. 11 Nov 1987

Acuta Enews November 1987, Vol. 16, No. 11

ACUTA Newsletters

In This Issue

President's Message

Party Line

Eight Action Points For Telco Execs

US West unit signs US Sprint to card validation service

Critical Issues in Premises Cabling

Need a Consultant? Here's Why, When


Acuta Enews September & October 1987, Vol. 16, No. 9 & 10 Sep 1987

Acuta Enews September & October 1987, Vol. 16, No. 9 & 10

ACUTA Newsletters

In This Issue

Back to the Future: The Power of 1A2

Party Line

Potpourri

Equal Access Reaches 84% of America


Acuta Enews August 1987, Vol. 16, No. 8 Aug 1987

Acuta Enews August 1987, Vol. 16, No. 8

ACUTA Newsletters

In This Issue

President's Message

Party Line

PBX Helps University Provide Voice and Data

The Dangers to your Telecommunications System


Acuta Enews July 1987, Vol. 16, No. 1987 Jul 1987

Acuta Enews July 1987, Vol. 16, No. 1987

ACUTA Newsletters

In This Issue

Stanford University switches to the Meridian SL-100

The Broadband Cable Network

Party Line

Microcomputers Found More Available -and More Often Required -at Selective Colleges


Process Hazard Review For Drug Development, Rudolph R. Schwarz May 1987

Process Hazard Review For Drug Development, Rudolph R. Schwarz

Theses

The development of drugs has become increasingly complex, requiring the use of a wide variety of pharmaceutical actives and isolated intermediates, a majority of which are not always completely characterized with respect to their hazard potential. This can present a source of potential exposure to those who handle these substances during initial drug development, manufacturing of the drug active and ultimately the finished pharamaceutical product. It is, therefore, essential that safety and health information be documented and communicated during the entire drug development process.

The need for application of process hazard review techniques to the development of new drug materials ...


Infrastructure And Operational Improvements Of The Septa Regional Rail System, Vukan R. Vuchic, Shinya Kikuchi May 1987

Infrastructure And Operational Improvements Of The Septa Regional Rail System, Vukan R. Vuchic, Shinya Kikuchi

Departmental Papers (ESE)

Since its takeover of the Regional Rail System from Conrail in 1983, SEPTA has made numerous efforts to adjust its facilities and operations to the needs of a modern regional rail system. In order to meet the needs of a modern transit-type operations of regional rail with shorter headways and greater operational flexibility, the infrastructure, such as track layout and signals, is one of the elements that requires changes. The current infrastructure was originally designed for freight and long distance railroad operations. This study represents part of SEPTA's efforts to modernize its regional rail infrastructure and operations in a ...


Acuta Enews April 1987, Vol. 16, No. 4 Apr 1987

Acuta Enews April 1987, Vol. 16, No. 4

ACUTA Newsletters

In This Issue

New Haven Seminar

Telephone System Installation Some Helpful Hints

Party Line

Building Wiring Options

Potpourri

Facilities Management Market to Grow


Improving Maintenance Effectiveness, Stephen J. Thierry Apr 1987

Improving Maintenance Effectiveness, Stephen J. Thierry

Master's Theses

A methodology is advanced for measuring the productivity of industrial maintenance operations. A work sampling study and a production to maintenance interface survey are conducted to identify the current level of maintenance effectiveness at a food processing plant. Variables affecting maintenance effectiveness are postulated from site observations of the plant maintenance operation. A total of nine changes are proposed; three are implemented as part of this study and six remaining changes are proposed for the future. All recommendations are targeted at increasing the overall effectiveness of the maintenance operation under study.


Quadratic Lyapunov Functions For Mechanical Systems, Daniel E. Koditschek Mar 1987

Quadratic Lyapunov Functions For Mechanical Systems, Daniel E. Koditschek

Technical Reports (ESE)

The “mechanical systems” define a large and important class of highly nonlinear dynamical equations which, for example, encompasses all robots. In this report it is shown that a strict Lyapunov Function suggested by the simplest examplar of the class - a one degree of freedom linear time invariant dynamical system - may be generalized over the entire class. The report lists a number of standard but useful consequences of this discovery. The analysis suggests that the input-output properties of the entire class of nonlinear systems share many characteristics in common with those of a second order, phase canonical, linear time invariant differential ...


Acuta Enews March 1987, Vol. 16, No. 3 Mar 1987

Acuta Enews March 1987, Vol. 16, No. 3

ACUTA Newsletters

In This Issue

President's Message

Party Line

Potpourri

Notice of Elections and Constitutional Amendments

Memorandum

Your Future in Telecommunications


Acuta Enews February 1987, Vol. 16, No. 2 Feb 1987

Acuta Enews February 1987, Vol. 16, No. 2

ACUTA Newsletters

In This Issue

President's Message

ACUTA Winter Seminar

Party Line

Cable Carnage: Coaxial battered

Confusion abounds

U.S. Asking Room for 'Baby Bells' To Grow

Experts Say Competition Would Stir Innovation


Acuta Enews January 1987, Vol. 16, No. 1 Jan 1987

Acuta Enews January 1987, Vol. 16, No. 1

ACUTA Newsletters

In This Issue

Potpourri

Party Line

You, Too, Can Avoid Those Frightening Pitfalls during implementation of a New Phone System

Mule Helps Maintain Phone Line In Canyon

Leihigh constructs voice/data net

Development Deal Brings AT&E's Wristwatch Pager Closer

Letter to the Editor


An Automated Real-Time Imaging System For Inspection Of Composite Structures In Aircraft, D. R. Hamlin, B. M. Jacobs, R. H. Peterson, W. R. Van Der Veer Jan 1987

An Automated Real-Time Imaging System For Inspection Of Composite Structures In Aircraft, D. R. Hamlin, B. M. Jacobs, R. H. Peterson, W. R. Van Der Veer

Review of Progress in Quantitative Nondestructive Evaluation

The use of composite structures in military aircraft has grown significantly in recent years. As an example, the F-15 is approximately 2 percent composite by weight compared to the more recent AV-8B which is approximately 31 percent by weight. Projections for the use of composite materials in future aircraft design indicate that this trend will continue. A significant portion of the increased use of composites involves essential aircraft structural components—wings, stabilators, control surfaces, etc. Consequently, regular inspection of these structures at military installations will become increasingly necessary to help assure structural integrity.


Status Of Advanced Ut Systems For The Nuclear Industry, M. Behravesh, M. Avioli, G. Dau, S.-N. Liu Jan 1987

Status Of Advanced Ut Systems For The Nuclear Industry, M. Behravesh, M. Avioli, G. Dau, S.-N. Liu

Review of Progress in Quantitative Nondestructive Evaluation

An advanced ultrasonic testing (UT) system is a configuration of hardware that includes some type of computer. The computer may be hardwired to perform specific functions or have appropriate software. It may typically be used for data acquisition, signal processing, image generation, pattern recognition and data analysis. Additionally, advanced systems have data storage and are, therefore, different from the standard transducer-pulser/receiver systems that rely on human filtering and written documentation of the filtered data.


Real Defects For Verification Of Ultrasonic Testing Models, John R. Bower Jan 1987

Real Defects For Verification Of Ultrasonic Testing Models, John R. Bower

Review of Progress in Quantitative Nondestructive Evaluation

Most ultrasonic inspections are based on idealized calculations of ultrasonic responses. The adequacy of a proposed inspection is determined by the accuracy of the calculations and the model of the assumed flaw. For generalized cases, the calculations can be quite difficult.


Analysis Of The Rfc/Nde System Performance Evaluation Experiments, A. P. Berens Jan 1987

Analysis Of The Rfc/Nde System Performance Evaluation Experiments, A. P. Berens

Review of Progress in Quantitative Nondestructive Evaluation

The RFC/NDE System comprises automated eddy current and ultrasonic inspection stations developed by Systems Research Laboratories for Air Force depot level inspections of aircraft engines. The system performance is being evaluated through a series of experiments whose objectives are to quantify crack detection capability as a function of crack size in various engine components. This paper presents the eddy current results from the first (preliminary) phase of this evaluation.


Application Of The Rfc/Nde System Testing Results, C. G. Annis Jr., T. Watkins Jr. Jan 1987

Application Of The Rfc/Nde System Testing Results, C. G. Annis Jr., T. Watkins Jr.

Review of Progress in Quantitative Nondestructive Evaluation

The evaluation of the RFC/NDE System has produced capability characteristics in the format of â vs. a or apparent cracksize vs. actual cracksize. Although crack sizing has long been a major concern of NDE practitioners and theoreticians, the analysis procedure which permits straightforward conversion of these â vs. a to POD vs. a, or Probability of Detection vs. cracksize, is a recent development [1]. This paper will compare these two descriptions of NDE system capability by comparing their influence on the Retirement for Cause (RFC) process.


The Detection Of Cracks Under Installed Fasteners By Means Of A Scanning Eddy-Current Method, David Harrison Jan 1987

The Detection Of Cracks Under Installed Fasteners By Means Of A Scanning Eddy-Current Method, David Harrison

Review of Progress in Quantitative Nondestructive Evaluation

As a consequence of metal fatigue, cracks can develop and grow in operational aircraft. Periodic inspections must be made in order to detect and repair them before they reach a dangerous length. Cracks which grow from holes are a significant problem for aircraft since the wings and fuselage can contain many thousands of fasteners. Since it is impractical to remove them all, inspection must be made with them installed.


Crack Sizing By The Time-Of-Flight Diffraction Method, In The Light Of Recent International Round-Robin Trials, (Ukaea, Ddt And Pisc Ii), Graham J. Curtis Jan 1987

Crack Sizing By The Time-Of-Flight Diffraction Method, In The Light Of Recent International Round-Robin Trials, (Ukaea, Ddt And Pisc Ii), Graham J. Curtis

Review of Progress in Quantitative Nondestructive Evaluation

In 1980–81, Harwell developed a mini-computer controlled multi-probe defect detection and sizing system(l) based on the ultrasonic time-of-light/diffraction principle introduced by Silk(2). This system proved to be capable of fully automatic data collection from the PWR girth-weld simulation Plates 1 and 2 in the Defect Detection Trials of 1981–82. The speed of collection and subsequent analysis was such that a report on the defects found could be filed within 48 hours. The mode of operation adopted simulated minimum time of access to the defects, and was intended to define that dimension of a defect which ...


Results Of The Phase I Reliability Test On The Rfc/Nde Eddy Current Station, Ray T. Ko Jan 1987

Results Of The Phase I Reliability Test On The Rfc/Nde Eddy Current Station, Ray T. Ko

Review of Progress in Quantitative Nondestructive Evaluation

The Phase I Reliability Test was successfully conducted on the RFC/NDE Inspection System in November, 1985, at Systems Research Laboratories, Inc. The objective of the test was to ensure the RFC/NDE Inspection System’s ability to reliably inspect the crack-critical geometric features on representative F100 engine parts. Three types of EC reliability specimens (representing gas turbine engine disk geometries) were inspected: flat plates (web/bore surface); 0.316-inch diameter boltholes (with 45° chamfers on both sides of the specimen holes); and 0.177-inch diameter rivet holes. Thirty specimens of each type were used, with each containing either a ...


Design And Operation Of A Dual-Bridge Ultrasonic Inspection System For Composite Materials, David C. Copley Jan 1987

Design And Operation Of A Dual-Bridge Ultrasonic Inspection System For Composite Materials, David C. Copley

Review of Progress in Quantitative Nondestructive Evaluation

The accepted method of inspecting composite aircraft and engine components is ultrasonic testing with a C-scan presentation of results. Within the last few years, analog recording systems have been superseded by digital data acquisition and analysis. Programmable control of mechanical scanning has improved upon earlier machines which could test only simple flat and circular shapes. The equipment described here was designed to inspect complex profiles such as aircraft engine vanes and ducts. A unique dual-bridge design with synchronized eleven-axis motion control was used to achieve this. The success of the system resulted from careful definition of initial design, and from ...


Using A Squirter To Perform Pulse-Echo Ultrasonic Inspections Of Gas Turbine Engine Components: The Pros And Cons, David A. Stubbs Jan 1987

Using A Squirter To Perform Pulse-Echo Ultrasonic Inspections Of Gas Turbine Engine Components: The Pros And Cons, David A. Stubbs

Review of Progress in Quantitative Nondestructive Evaluation

The Air Force’s Retirement For Cause (RFC) ultrasonic system uses a low pressure water squirter system to couple the ultrasound to the engine part undergoing inspection. From an overall system point-of-view, there are many advantages in the use of the squirter as compared to the use of a standard immersion tank. Foremost of the advantages are the ease of use and ease of maintenance. However, from an NDE point of view (the reliable detection of small flaws) the squirter technique has several disadvantages. The squirter complicates the inspection process by adding factors such as a dynamic water column serving ...


An Apparatus For The Automated Nondestructive Testing Of Electroexplosive Devices Using The Electrothermal Transient Technique, Harper L. Jacoby, Keith S. Pickens, John F. Tyndall, Steve P. Clark, Robert A. Baker, Ronald H. Peterson Jan 1987

An Apparatus For The Automated Nondestructive Testing Of Electroexplosive Devices Using The Electrothermal Transient Technique, Harper L. Jacoby, Keith S. Pickens, John F. Tyndall, Steve P. Clark, Robert A. Baker, Ronald H. Peterson

Review of Progress in Quantitative Nondestructive Evaluation

An electroexplosive-device (EED) tester was developed by Southwest Research Institute (SwRI) for the U.S. Army Munitions and Chemical Command under contract number DAAK10-84-C-0206. The tester was designed to nondestructively evaluate (NDE) eight different electrothermal devices at production rates up to 45 parts per minute. The tester automatically removes the device to be tested from an input tray, places it in a test fixture, performs an electrothermal transient test, and places the device into an accept/output tray or a reject bin, depending on the quantitative decision made by an analysis computer. The entire NDE is done without hazard to ...


System Of Inspection Assisted By Microprocessor, J. L. Arnaud, M. Floret, D. Lecuru Jan 1987

System Of Inspection Assisted By Microprocessor, J. L. Arnaud, M. Floret, D. Lecuru

Review of Progress in Quantitative Nondestructive Evaluation

In spite of significant advances in the field of automatic inspection (robotization, motorization), there are still numerous cases where the cost of such facilities cannot be justified due to the low production rates, or to the fact that they are not easily applicable due to the shape of the parts or to the environment (on-site maintenance inspection or inspection during manufacture in particular areas of composite parts).


A Semi-Automatic System For The Ultrasonic Measurement Of Texture, Sam J. Wormley, R. Bruce Thompson Jan 1987

A Semi-Automatic System For The Ultrasonic Measurement Of Texture, Sam J. Wormley, R. Bruce Thompson

Review of Progress in Quantitative Nondestructive Evaluation

The texture (preferred grain orientation) of rolled metal plates influences a number of important mechanical properties such as their ability to be plastically formed into complex shapes. X-ray diffraction techniques can characterize texture in great detail but are unsuitable for real time process control. Furthermore, x-rays only sample the properties of a near surface layer, whereas the average properties throughout the thickness may be of greater interest. This paper describes an alternate texture characterization approach based on ultrasonic measurements of the anisotropy of plate wave velocities. Relationships have recently been established between the macroscopic elastic constants of a rolled metal ...


Model-Based Ultrasonic Nde System Qualification Methodology, T. A. Gray, R. Bruce Thompson, B. P. Newberry Jan 1987

Model-Based Ultrasonic Nde System Qualification Methodology, T. A. Gray, R. Bruce Thompson, B. P. Newberry

Review of Progress in Quantitative Nondestructive Evaluation

The use of computer models of ultrasonic NDE inspections is a convenient and cost-effective alternative and/or companion to experimental reliability trials used for qualifying the detection reliability of a given inspection system applied to a given inspection task. In addition, the use of such models permits qualification of ultrasonic inspection of new component designs even before such components exist. This paper presents the current status of the implementation of a model-based software package for these system qualification applications. A brief overview of the model elements and assumptions will be followed by a discussion of the detection system qualification methodology ...


Deregulierung – Ein Rückfall Ins Primitive?, Vukan R. Vuchic Jan 1987

Deregulierung – Ein Rückfall Ins Primitive?, Vukan R. Vuchic

Departmental Papers (ESE)

No abstract provided.


Istorija I Uloga Javnog Prevoza, Vukan R. Vuchic Jan 1987

Istorija I Uloga Javnog Prevoza, Vukan R. Vuchic

Departmental Papers (ESE)



The Application Of Operations Research Methods To Schedule Replacement Workers In A Cost Effective Manner /, Beverly J. Wolfe Jan 1987

The Application Of Operations Research Methods To Schedule Replacement Workers In A Cost Effective Manner /, Beverly J. Wolfe

Theses and Dissertations

No abstract provided.