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CAD CAM MANUFACTURING OF PROTOTYPE SHIPBOARD COMPONENTS

NAVAL ENGINEERS JOURNAL 1990年第3期102卷 93-99页

作者： CALVERT, TE RODRIGUEZ, FA SLEBZAK, JS Thomas E. Calvert P.E.: is a senior project engineer with the Propulsion and Auxiliary Systems Department David Taylor Research Center Annapolis Md. His interests include application of computers to all aspects of engineering with particular emphasis on utilization of small computers. Mr. Calvert is a licensed professional engineer in Maryland. He received a BSEE from Drexel University in 1969 and since that time has completed a number of graduate courses related to machinery acoustics. Francisco A. Rodriguez:is an engineer with the Propulsion and Auxiliary Systems Department David Taylor Research Center. He was formerly with the Computer-Aided Design/Interactive Graphics Group of the Division of Engineering and Weapons U.S. Naval Academy. His interests include interfacing the computer aided design to the computer aided manufacturing along with related software and hardware development. Mr. Rodriguez received a BSEEfrom the University of Virginia in 1968. James S. Slebzak:is a mechanical engineering technician with the Propulsion and Auxiliary Systems Department David Taylor Research Center. He received his machinists papers in 1971 after serving his apprenticeship at David Taylor Research Center. He continued his education and became the senior numerical control programmer at the Annapolis Laboratory. He completed his mechanical technology degree from Anne Arundel Community College in 1986. His interests are in the application of numerically controlled manufacturing techniques to prototype machinery components.

The machine shop at the Annapolis Laboratory of the David Taylor Research Center (DTRC) provides model making and prototype support to a large variety of naval ship related engineering projects. In order to meet these challenging requirements, computer aided design/computer aided manufacturing (CAD/CAM) techniques are being used to produce “one of a kind” prototypes or very low volume production parts. The use of computer aides in these cases is to facilitate the accurate manufacture of a difficult part, rather than to improve manufacturing efficiencies. In addition, the approach provides the flexibility required to support research and development projects. Several examples of prototype shipboard components manufactured using CAD/CAM techniques are presented in this paper. The hardware and software that facilitated these projects are discussed. The examples described have met the requirements to produce a wide variety of prototype shipboard machinery components quickly and accurately.

关键词： Ship Equipment

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Sierpinski Sponge in a Simple Generic DiffeomorphismSierpinski‐type self‐similarity is demonstrated in a generic differentiable system

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computer in Physics 1990年第5期4卷 494-498页

作者： O. E. Rössler M. Klein G. Baier J. Parisi J. Peinke M. Krug J. L. Hudson 1Division of Theoretical Chemistry University of Tübingen 2an experimentalist‐cum‐theoretician in the Institute for Chemical Plant Physiology University of Tübingen 3low‐temperature condensed‐ matter physicists working in nonlinear science at the Physical Institute University of Tüubingen 4computer‐aided drug design at the Pharmaceutical Institute University of Tübingen 5Department of Chemical Engineering University of Virginia at Charlottesville

O. E. Rössler, M. Klein, G. Baier, J. Parisi, J. Peinke, M. Krug, J. L. Hudson; Sierpinski Sponge in a Simple Generic Diffeomorphism: Sierpinski‐type self‐simil

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SHIP SERVICE ELECTRICAL SYSTEMS - designING FOR SURVIVABILITY

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NAVAL ENGINEERS JOURNAL 1990年第5期102卷 32-36页

作者： CERMINARA, J KOTACKA, RO John Cerminara:is a principal engineer with Westinghouse Machinery Technology Division Electrical Systems Department. He holds a B.S. degree in electrical engineering from the University of Pittsburgh. He is a registered professional engineer and a member of IEEE ASNE and the Ship Steering Group of the Combat Survivability Division of ADPA. Mr. Cerminara has had over 30 years of multidiscipline experience ranging from engineering and construction in heavy industry to standards and publications. Past assignments include DOE/ NASA wind turbine project manager for Westinghouse and task leader of MTD electrical systems. Most recent assignments have included hull mechanical and electrical (HM&E) distributive system survivability analyses of the LSD-41 mobility mission area and application and validation of NavSea computer-aided design of Survivable Distributive System (CADSDiS) Program. Rolf O. Kotacka:is presently a ship systems engineer in the Ship Systems Engineering Branch of the Naval Sea Systems Command Engineering Directorate where his primary responsibility is ship system survivability. He is a 1977 graduate of SUNY Maritime College where he received his bachelor of engineering degree in marine electrical engineering as well as a U.S. Coast Guard Third Assistant Engineer License and a commission in the U. S. Naval Reserve. Upon graduation Mr. Kotacka was employed by Charleston Naval Shipyard as a field engineer until 1981 where he gained his background in surface ship HM&E systems and equipment. He then transferred to the Supervisor of Shipbuilding Conversion and Repair Groton where he served as a senior electrical engineer monitoring the design and construction of Trident and 688 class submarines and received the Meritorious Unit Citation. Prior to his present position Mr. Kotacka was the life cycle manager for diesel generator sets in the Naval Sea Systems Command's Generators Branch. He has coauthored several papers dealing with power generation for ASE and SNAME. Mr. Kotacka is also a lieutena

This paper highlights the survivability concerns in the design of ship service power systems. The paper gives a brief description of what constitutes a typical ship service electric power system and concentrates on electric power generation and associated controls. Established survivability design principles and guidelines are highlighted and the application of those guidelines are discussed. General Specifications (Gen Specs) for Ships of the U.S. Navy are cited as the cornerstone for design. Specific design criteria are cited as well as the rationale associated with the survivability design guidelines pertaining to power generation and distribution. The application of these survivability design guidelines plus the use of the deactivation diagram/damage tolerance analysis cited in the Gen Spec section 072e will enhance overall design and help ensure survivable electric power systems for surface combatants.

关键词： Warships

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COMPARATIVE STRUCTURAL LIFE ASSESSMENT OF PATROL BOAT BOTTOM PLATING

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NAVAL ENGINEERS JOURNAL 1990年第3期102卷 253-262页

作者： AYYUB, BM WHITE, GJ BELLWRIGHT, TF PURCELL, ES Bilal M. Ayyub:is currently an associate professor of civil engineering at the University of Maryland. He received his B.S. degree in civil engineering from the University of Kuwait in 1980. He completed both his M.S. (1981) and Ph.D. (1983) in civil engineering at the Georgia Institute of Technology. Dr. Ayyub has an extensive background in risk-based analysis. He is engaged in research work involving structural reliability marine structures and mathematical modeling using the theories of probability statistics and fuzzy sets. His research work has been sponsored by the National Transportation Safety Board National Science Foundation U.S. Coast Guard Department of Defense State of Maryland and University of Maryland. He is the author of more than 100 publications in national and international journals conference proceedings and reports. Dr. Ayyub was a recipient of the ASNE “Jimmie” Hamilton Award for 1985 the ASCE “Outstanding Research Oriented Paper” in theJournal of Water Resources Planning and Managementfor 1987 and Edmund Friedman Young Engineer Award for Professional Achievement from ASCE for 1989. Gregory J. White:is an associate professor of naval architecture at the U.S. Naval Academy. He received his B.S. degreein engineering mechanics from Vanderbilt University in 1975 an M.E. degree in naval architecture from the University of California Berkeley in 1981 and a Ph.D. in civil engineering (structures) from the University of Maryland in 1986. Dr. White served on active duty with the U.S. Navy from 1975 to 1979 as a junior officer in the engineering and operations departments of Pacific Fleet destroyers. Prior to coming to the Naval Academy he worked at Mare Island Naval Shipyard in the scientific code and in the R&D division of Exxon International company's Tanker Department. Dr. White is the author of more than two dozen technical articles and reports and is one of the U.S. representatives to the International Ship and Offshore Structures Congress (ISSC). His research interests lie in t

The estimation of an absolute life expectancy of a structure is a complex process and the results are expected to have relatively large levels of uncertainty. In this study, a comparative analysis is undertaken between two different patrol boats. This is an approach which results in a higher confidence level because certain factors common to both boats can be eliminated by assuming them to be at constant normal levels. The study is limited to the critical forward bottom plating and takes into account the differences in material, plate dimensions, operational profile, structure and loading of the two vessels. Two failure modes, plastic plate deformation and fatigue, are considered, and a novel approach to plate wastage is included. Many factors affect the structural life of a vessel. They include structural type, operational profile, structural details, loads, inspection and maintenance, design methods, safety factors, corrosion, and environmental factors. There are three types of uncertainty associated with these factors; namely, physical randomness, statistical uncertainties, and model uncertainties. The method described is designed to address these uncertainties. The objective of the paper is to present the reliability-based structural life assessment method, and then to use it to evaluate and compare the structural performance of the forward bottom plating of the two patrol boats. The results of the evaluation are presented in the form of graphs and tables in order to facilitate the comparative evaluation. The method is performed within a computer-based format which allows parametric sensitivity analysis of several variables including the size of the plating panel, thickness, operational profile and loading. The sensitivity of the structural life expectancy of the forward bottom plating to variations in these parameters is evaluated.

关键词： Naval Vessels

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IMPROVED DETERMINISTIC TEST PATTERN GENERATION WITH APPLICATIONS TO REDUNDANCY IDENTIFICATION

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IEEE TRANSACTIONS ON computer-aided design OF INTEGRATED CIRCUITS AND SYSTEMS 1989年第7期8卷 811-816页

作者： SCHULZ, MH AUTH, E Institute of Computer-Aided Design Department of Electrical Engineering Technical University Munich Munich Germany

The authors present several concepts and techniques aiming at a further improvement and acceleration of the deterministic test-pattern-generation and redundancy identification process. In particular, they describe an improved implication procedure and an improved unique sensitization procedure. While the improved implication procedure takes advantage of the dynamic application of a learning procedure, the improved unique sensitization procedure profits from a dynamic and careful consideration of the existing situation of value assignments in the circuit. As a result of the application of the proposed techniques, SOCRATES is capable of both successfully generating a test pattern for all testable faults in a set of combinational benchmark circuits, and of identifying all redundant faults with less than ten backtrackings.< >

关键词： Test pattern generators Circuit testing Circuit faults Redundancy Electron devices Fault diagnosis CMOS technology Switches Automatic testing

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A low-cost real-time man-in-the-loop simulation for multibody systems

A low-cost real-time man-in-the-loop simulation for multibod...

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ASME 1989 design Technical Conferences, DETC 1989

作者： Chang, J.L. Kim, S.S. Center for Computer Aided Design Department of Mechanical Engineering University of Iowa Iowa CityIA United States

ISBN: (纸本)9780791803691

This paper presents a ~eneral approach for achieving realt1me n:ian-in-th-loop simla110.n for. multibody dynamic systems. Emerging real-time dynamics s1mulat1on technologies are exploited to evelop a lo.w-cot network based simulator as an interactive design workstation with a human operator in the control loop An efficiet recursive dynamic formulation is ued to create multibody dynamics ***. A parallI processing algorithm is developed based on *** recursive dynamics forulatlon and implemented on a multiprocesor computer to achieve. real-time simulation. As a real-time integration . algorltm. th1r-order Adams-Bashforth method is used. The integrat1?n steps1ze is estimated from th eigenvalue analyis of the equations f '!10tio. High speed compute graphics techniques prov1e ehst1c visual display for the simulator. A backhoe iulat1on is "!1Plemented as an example to demonstrate the feas1b1hty of man-in-the-loop simulation on the low-cost simulator. © 1989 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Simulators

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A dynamics workstation

A dynamics workstation

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ASME 1989 design Technical Conferences, DETC 1989

作者： Wu, J.K. Fogle, M.A. Wang, J.Y. Lu, J.K. Center for Computer Aided Design College of Engineering Department of Mechanical Engineering University of Iowa Iowa CityIA United States

ISBN: (纸本)9780791803691

The engineer's mdelin capability is the weakest link in the chain that supports th s1mulat1on of dynamic mechanical systems, due to the fact that engineers are forced to define mechanical system models in a way they. are not familiar with. Advanced developments in computer tech1ques, computer graphics, and recursive computational algorithms for mechanical systems make the high speed dynamic simulation and graphic animation of mechanical systems feasible. But without a practical, useful modeling tool th engineer has difficulty in using these advanced techniques ' e The Dynamics Workstation Is a modeling tool developed t h 1 the engineer define mechanical system models in a ntuF practical way. The engineer cn communicate with the workstatio naturally and interatlvely, define th model In formats that meet the needs for both high speed dynamic simulation and conventional dynamic analysis, define and assemble the model body by body using a relative coordinate ***, visalize the configuration of the model, carry out simple ioint exercise to detect the errors of the model in the early design stage, graphically lock and unlock joints and adjust the system configuration even after initial assembly'. The workstation automatically generates the mechanical system model based on the engineer's Interactive Input data. The model design system strengthens the. engineer's modeling capability;It not only Improves the design quality, but also boosts productivity. © 1989 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Engineers

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ESSENTIAL: an efficient self-learning test pattern generation algorithm for sequential circuits

ESSENTIAL: an efficient self-learning test pattern generatio...

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IEEE International Test Conference

作者： M.H. Schulz E. Auth Institute of Computer Aided Design Department of Electrical Engineering Technical University Munich Munich Germany

The authors present ESSENTIAL, deterministic automatic test pattern generation algorithm for sequential circuits. By combining reverse time processing over time frames and forward processing within time frames, ESSENTIAL avoids the detrimental a priori determination of a topological path to be sensitized or of a primary output, to which the fault effects have to be propagated. Moreover, the proposed test generation approach fully exploits the beneficial techniques that have successfully been used for combinational circuits by the automatic test pattern generation system SOCRATES. In particular, the authors discuss a learning procedure for global implications not only over reconvergent fanout, but also over time frames as well as static and dynamic unique sensitization techniques. After introducing a couple of intelligent heuristics employed for guiding and supporting the decision-making process, the authors report some preliminary but encouraging experimental results.< >

关键词： Test pattern generators Automatic test pattern generation Circuit testing Sequential circuits Circuit faults Automatic testing System testing Combinational circuits Coupling circuits Decision making

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Parallel Pattern Fault Simulation of Path Delay Faults

Parallel Pattern Fault Simulation of Path Delay Faults

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design Automation Conference

作者： M.H. Schulz F. Fink K. Fuchs Institute of Computer Aided Design Department of Electrical Engineering Technical University Munich Munich Germany

This paper presents an accelerated fault simulation approach for path delay faults. The distinct features of the proposed fault simulation method consist in the application of parallel processing of patterns at all stages of the calculation procedure, its versatility to account for both robust and non-robust detection of path delay faults, and its capability of efficiently maintaining large numbers of path faults to be simulated.

关键词： Delay Circuit faults Circuit testing Fault detection Timing computational modeling Circuit simulation Permission Logic testing Parallel processing

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Advanced automatic test pattern generation techniques for path delay faults

Advanced automatic test pattern generation techniques for pa...

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International Symposium on Fault-Tolerant Computing (FTCS)

作者： M.H. Schulz K. Fuchs F. Fink Institute of Computer Aided Design Department of Electrical Engineering Technical University Munich Munich Germany

Based on the sophisticated techniques applied in the automatic test pattern generation system SOCRATES, the authors present the extension of SOCRATES to test generation for path delay faults. In particular, they propose a ten-valued logic and describe the corresponding implication and path sensitization procedures in detail. After discussing an extended multiple backtrace procedure, which has been developed specifically to meet the requirements of path delay testing, they conclude with a number of experimental results.< >

关键词： Automatic test pattern generation Delay Circuit faults Circuit testing System testing Test pattern generators Timing Latches Logic testing Clocks

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