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FORMATION AND BREAKING OF SIDE-CURL DOMINATED SHORT-SPIRAL CHIPS

FORMATION AND BREAKING OF SIDE-CURL DOMINATED SHORT-SPIRAL C...

ASME 1997 International mechanical engineering Congress and Exposition, IMECE 1997 - Manufacturing Science and engineering

作者： Li, Zhenjia Qu, Guimin Xu, Yihong Rong, Yiming Department of Mechanical Engineering Harbin University of Science and Technology' China Manufacturing Systems Program Southern Illinois University Carbondale United States

ISBN: (纸本)9780791826799

In this paper, the formation of side-curl dominated chips IS first discussed, as well as the side-curl radius. The chip width and thickness in 3-D side-surl is studied for the side-curl radius prediction. The formation and and breaking of side-curled short-spiral chips in metal cutting is particularly studied. It is found that the collision of the swinging chip and the unmachined workpiece surface or tool holder flank surface plays an important role in chip breaking. Based on a force analysis, a chip breaking criterion is established and the chip length is estimated. The relationship of chip breaking length and cutting parameters is derived and verified by experiment results, which can be used in chip length prediction. © 1997 American Society of mechanical Engineers (ASME). All rights reserved.

关键词： Metal cutting

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AUTOMATED MODULAR FIXTURE PLANNING: ACCURACY, CLAMPING, AND ACCESSIBILITY ANALYSIS

AUTOMATED MODULAR FIXTURE PLANNING: ACCURACY, CLAMPING, AND ...

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ASME 1997 International mechanical engineering Congress and Exposition, IMECE 1997 - Manufacturing Science and engineering

作者： Wu, Yufeng Rong, Yiming Ma, Weidong LeClair, Steven R. Department of Mechanical and Industrial Engineering University of Illinois Urbana-Champaign United States Manufacturing Systems Program Southern Illinois University Carbondale United States Materials Directorate Wright Laboratory Wright-Patterson Air Force Base United States

ISBN: (纸本)9780791826799

Automated fixture design has become a research focus in process planning and CAD/CAM integration. An automated fixture configuration design system has been developed where when fixturing surfaces and points are specified, modular fixture components can be automatically selected and placed into position with satisfying assemble conditions. A geometric analysis has been conducted to determine the fixturing surfaces and points which provide feasible geometric constraints and assembly relationships with modular fixtures. This paper presents analyses on fixturing accuracy, clamp planning, fixturing accessibility, and clamping stability. When a fixture planning is determined, the analysis results can be applied to verify the performance of the fixture design. © 1997 American Society of mechanical Engineers (ASME). All rights reserved.

关键词： Fixtures (tooling)

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Ship habitability - Preparing for the 21st century

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NAVAL ENGINEERS JOURNAL 1997年第6期109卷 21-27页

作者： Meere, EP Grieco, L Edward P. Meere:works in the Arrangements Division of the NavSea Systems Command (SEA 03H1) and has been the Navy Habitability Program Manager for the past three years. He received a Bachelor of Science in Engineering Science from Illinois Institute of Technology in 1966. He received a Masters of Business Administration from the American University in 1977. His experience to date includes: Mathematics teacher at Prince Georges Community College for 7 years 10 years as Branch Head for Carrier and Amphibious Arrangements Project Engineer for Underway Replenishment Equipment responsible for the concept and development of the One Man Control Station. Louis R. Grieco:is a Supervisory Mechanical Engineer in the Habitability Branch of the Hull and Deck Machinery Department at the Naval Surface Warfare Center Carderock Division Philadelphia where he has been employed since 1971. He received a Bachelor of Science in Mechanical Engineering degree from Drexel University in 1979. His experience to date includes trade design and combat systems assignments at Philadelphia Naval Shipyard from 1960 to 1971 In Service Engineering Section and Branch Head for cargo/ weapons elevators conveyors torpedo handling systems habitability equipment and underway replenishment equipment and Life Cycle Manager for habitability systems. He also serves as a member of the Industrial Advisory Board at Temple University Philadelphia PA.

This paper discusses the problems identified in a FY 1995 fleet habitability survey. The survey questioned the fleet on the quality of shipboard living and working conditions and identified shortfalls in berthing, sanitary spaces, and food service systems that influence crew morale, safety, and ultimately mission effectiveness. Existing habitability programs, new initiatives and responses to the survey problems, plus a few quality of life ideas for the 21st century, are outlined.

关键词： Warships

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Maintenance avoidance and maintenance reduction

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NAVAL ENGINEERS JOURNAL 1997年第1期109卷 47-56页

作者： Jacobs, KS McComas, JP Kenneth J. Jacobs:is director of the Naval Sea Systems Command's Surface Ship Maintenance Division (Sea 915). Originally trained as a data systems technician he attended Old Dominion University in Norfolk Virginia and graduated with a B.S degree in mechanical engineering in 1975. Over the course of the last twenty-one years Mr. Jacobs has served in NavSea as a project engineer for boats and service craft as the type desk for AFS AOR AO and AOG ship types and as manager of the Amphibious and Auxiliary Ship Maintenance Strategy Program where he was instrumental in the development and implementation of the Phased Maintenance Program. He has authored several papers on the subject of ship maintenance and is a member of Tau Beta Pi Engineering Honor Society ASNE and the Association of Scientists and Engineers. Jon P. McComas:is a 1967 graduate of the U.S. Naval Academy and a 1974 graduate of the Naval Postgraduate School where he earned an M.S. degree in mechanical engineering. He also completed the Executive Management Program at North-western University in 1988. During his twenty-eight year naval career he served in destroyers and was a qualified surface warfare officer. He was designated an engineering duty officer in 1977 and subsequently held a number of positions primarily in the area of fleet maintenance and modernization including ship superintendent and type desk officer at Philadelphia Naval Shipyard assistant maintenance officer on the staff of ComNav-SurfGru WestPac in Subic Bay Phillippines assistant program manager for steam-powered surface combatants (PMS 313) and for gas turbine-powered surface combatants (PMS 314) at Navsea and director Maintenance Policy Branch (OP 433) on the CNO staff. Following a tour as head of engineering duty assignments at BuPers his last active duty assignment was at NavSea as the program manager for surface ships (PMS 335) responsible for life cycle management of more than 300 surface ships in forty-three ship classes and direction of the Navy Ship Inactivation P

Maintenance is performed to restore a system's inherent reliability. However, reliability is not enough: a maintenance task must ''pay for itself'' in dollars or readiness. This applies to all types of maintenance: corrective, preventive, and alterative. We can reduce corrective maintenance costs through preventive and alterative maintenance. We can reduce preventive maintenance costs by eliminating inapplicable and ineffecitve tasks. We must weigh alterative maintenance costs against the value of improved readiness and cost-avoidance of future corrective maintenance. The U.S. Navy is improving alterative maintenance by engineering for reduced maintenance (ERM). This process corrects the root cause of some high-cost items by replacing the system, component, or coating with an improved design or material. It overcomes the limit of preventive maintenance: higher levels of inherent reliability require design improvement. The U.S. Navy is improving preventive maintenance through condition-based maintenance (CBM). The Navy's CBM initiative encompasses three parallel efforts: rules (improving maintenance requirements and plans), tools (using computer and diagnostic technology to facilitate maintenance decision-making), and schools (educating all levels of maintenance decision-makers in reliability and condition-based maintenance engineering principles). This paper addresses how the U.S. Navy surface ship community plans to avoid inapplicable and ineffective maintenance and reduce maintenance costs without sacrificing reliability.

关键词： Logistics

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Erratum: ‘‘Interaction of adjacent bursts in the wall region’’ [Phys. Fluids 6, 954 (1994)]

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Physics of Fluids 1997年第1期9卷 247-247页

作者： B. D. Coller P. Holmes John Lumley Control and Dynamical Systems California Institute of Technology 104‐44 Pasadena California 91125 Department of Mechanical and Aerospace Engineering and Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 Sibley School of Mechanical and Aerospace Engineering Cornell University Ithaca New York 14853

B. D. Coller, P. Holmes, John Lumley; Erratum: ‘‘Interaction of adjacent bursts in the wall region’’ [Phys. Fluids 6, 954 (1994)], Physics of Fluids, Volume 9,

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Developing a prototype concurrent design tool for composite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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The Regional Deterrence Ship (RDS 2010) - A design for littoral warfare in the 2010 timeframe

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NAVAL ENGINEERS JOURNAL 1996年第1期108卷 61-72页

作者： Calvano, CN Riedel, JS Professor Charles N. Calvano Capt. USN (Ret.): of the Naval Postgraduate School is responsible for a program in Total Ship Systems Engineering. He is a graduate of the Naval Academy who served as a surface warfare officer. After completion of his graduate education at MIT he became an Engineering Duty Officer and served at Boston Naval Shipyard in several capacities. He was the Repair Facilities Advisor to the Vietnamese Navy the Project Officer for construction of nuclear powered guided missile cruisers (CGNs) at the Supervisor of Shipbuilding Newport News Virginia and served on the staff of the Commander Naval Surface Forces U.S. Atlantic Fleet and later at the Supervisor of Shipbuilding in Portsmouth Virginia in maintenance and overhaul management positions. He was Officer in Charge of the Annapolis Laboratory of the David Taylor Research Center and Commanding Officer of the Engineering Duty Officer School. He retired from active duty in October 1991 after serving in the Naval Sea Systems Command as the Director of the Ship Design Group and of the Advanced Concepts and Technology Group. Lt. Jeffrey S. Riedel USN:is an Engineering Duty Officer currently assigned to the Supervisor of Shipbuilding Bath Maine. He obtained his B.S. degree in Marine Engineering from Maine Maritime Academy in 1986 and his M.S. degree in Mechanical Engineering plus a Mechanical Engineer's degree from the Naval Postgraduate School in 1993. Lt. Riedel's naval career has included duty aboaqrd USS Wainwright (CG 28) as auxiliaries officer damage control assistant and main machinery officer. Currently he serves as the assistant production officer at SUPSHIP Bath in charge of DDG 51 class construction and delivery.

This paper describes the design of a Regional Deterrence Ship (RDS 2010) for the 2010 timeframe. The requirements for the design were for a ship to operate in littoral areas of the world with a mission of deterring regional conflicts and of hampering the efforts of the aggressor in such a conflict. In addition the ship's mission included the evacuation of friendly personnel as hostilities become likely. The problem countering the littoral threat during times of constrained budgets is addressed. Top level requirements for the design, generated in parallel with ''.... From the Sea'' [1], were used to set the design goals. The paper describes the manner in which littoral warfare changes the nature of the challenges faced by Navy surface combatants, including a ship such as the RDS 2010. A number of factors become more crucial design concerns than for blue water ships, including reduced reaction times, likelihood of attack from hidden land sites, shallow water mines and shallow water USW Certain other factors become less critical in littoral areas and this also has ship design impacts. While some present ship designs can perform some of the tasks needed in a littoral warfare/regional conflict environment, none represents a completely integrated design (hull, mechanical & electrical;combat systems;fiscal and manning constraints;reduced vulnerability;robust self-defense etc.) for a vessel stationed in waters that, without warning, can become hostile. After describing the mission requirements to which the RDS 2010 was designed, the paper discusses the controlling design philosophy and decisions and describes the process used to assess threats to the ship. The process of combat system selection, against the backdrop of expected threat scenarios, is described and the intended approach to integration of the combat system is discussed. In recognition that decreased reaction times and surprise attacks are likely to threaten a ship engaged in regional deterrence, discussions oi

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Modeling and simulation in the sealift program

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NAVAL ENGINEERS JOURNAL 1996年第6期108卷 27-39页

作者： Edinberg, D Back, K McVeigh, J David Edinberg is a senior naval architect with Advanced Marine Enterprises in Arlington Virginia. His experience in ship design includes dynamic analysis of ship's deck systems intact and damaged stability calculations trim and stability support during ship designs and structural design. For the last two years he has led a team of engineers in the dynamic analysis of the sideport ramp system employed on the Navy's new sealift ships. He graduated in 1979 with a B.S. degree in naval architecture and marine engineering from the University of Michigan. Keith Back is a senior engineer with Advanced Marine Enterprises in Arlington Virginia. He is currently the section chief for the Advanced Visualization Group. He has more than ten years experience developing and using CAD models in the ship design environment. For the past two years he has led the development of visualization techniques and models for use in simulations for current ship design programs. He graduated in 1985 with a B.S. degree in aerospace and ocean engineering from Virginia Polytechnic Institute and State University. USA Lt. Col. Joe McVeigh USA is currently deputy program manager (Army) for PMS 385 the Strategic Sealift Office at NavSea. As the senior U.S. Army officer on staff he is responsible for interfacing with the program's primary customer in addition to his assignment as T&E director. Lt. Col. McVeigh graduated with a B.Sc. from the United States Military Academy in 1978 after which he received his 2nd lieutenant's commission in the U.S. Army Transportation Corps. In 1991 he received M.S. degrees in mechanical engineering and naval architecture and marine engineering from MIT. Lt. Col. McVeigh's previous assignments have included: platoon leader/XO 870th Terminal Transfer Company program support officer/XO/contract administrator DLA operations staff officer/Exercise Branch chief. Special Forces Europe company commander 598th Medium Truck Company commander Movement Control Team Mannheim and Army watercraft systems engineer U.S.

The Navy's Sealift program had several unique problems associated with it which have been addressed using innovative modeling and simulation tech niques. These techniques fall under two categories: visualization and dynamic analysis. This paper will discuss the employment of these techniques and the impact their application has had in the program. Also examined will be various difficulties that were encountered in the application of these techniques. Commercial-off-the-shelf (COTS) visualization tools were used to model the interior Ro/Ro spaces on the four classes of new construction and conversion ships now being procured. These models were employed for vehicle maneuvering simulations, operator familiarization and visualization of the results of an analysis of the loading and unloading of Ro/Ro vehicles. A COTS dynamic analysis system was used to simulate dynamic behavior during the assembly/deplopment and retrieval/disassembly of the side port ramp using the ships' cranes. These analyses supported reviews of design configurations, proposed handling procedures, and in conjunction with extensive post-processing, operability assessments for system operation. In a parallel effort, an interactive crane simulator was developed to support on-going engineering studies, indoctrination, and test and evaluation purposes. Lessons learned have been applied to other activities at the Naval Sea systems Command. Critical areas were the validation and maintenance of up-to-date configuration data for the visual models, adaptive levels of detail to meet the requirements of each study objective, and the need to provide comprehensive documentation of models.

关键词： Marine engineering

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Propagation properties of Love wave-type surface-acoustic wave on alpha-quartz

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第2期79卷 24-30页

作者： Isobe, A Hikita, M Asai, K Central Research Laboratory Hitachi Ltd. Kokubunji Japan 185 (Member) graduated from the Department of Physics Tohoku University in 1986 and completed an M.S. course in 1988. In that year he joined Hitachi Ltd. Presently he is with Hitachi Central Research Laboratory. He has been engaged in research on surface acoustic wave devices. (Member) completed the doctoral program of the Department of Electronic Engineering Hokkaido University in 1977 and remained as a research student. In 1978 he joined Hitachi Ltd. Presently he is a Senior Researcher at Hitachi Central Research Laboratory. He holds a Doctor of Engineering degree. He has been engaged in research on the electromagnetic field analysis boundary value problem of the surface acoustic wave interaction of the acoustic wave and optics high-performance SAW filter high-frequency circuit for satellite communication and mobile communication. In 1981 he received an Academic Promotion Award from I.E.I.C.E. In 1990 he received an IEEE MTT Microwave Prize Award. In 1991 he received a Kanto District Invention Award (from the Invention Society) and in 1993 a Commendation for Research Accomplishment from the Director of Science and Technology Agency. He is a senior member of IEEE. (Member) graduated from the Department of Mechanical Engineering Matsuyama Technical High School in 1984 and joined Hitachi Central Research Laboratory. In 1988 he graduated from the Department of Electronic Engineering Hitachi Keihin Technical School. Since then he has been engaged in research and development of the process technology of magnetic bubble memory and surface acoustic wave devices. Presently he is with the Communication Systems Department.

As a piezoelectric substrate for surface acoustic wave devices, the LST cut quartz has good temperature characteristics and low propagation loss. However, as the thickness of the metal electrodes on the substrate surface is increased, propagation loss also increases. Further, the electromechanical coupling coefficient is small. In this paper, a cut angle of the quartz substrate is sought that has excellent temperature stability, low propagation loss, and a large electromechanical coupling coefficient in the present of metal electrode films. For the rotated Y-cut substrate in the neighborhood of the LST cut, the propagating surface acoustic wave (SAW) merle changes from the leaky surface wave to the Love wave-type surface acoustic wave for which. no propagation loss occurs in theory while the electromechanical coupling coefficient increased to 0.5 percent at the maximum if gold is used for the electrodes and the propagation direction of the SAW is shifted from the X axis. This is shown by simulation. By experiment, it is shown that the second-order temperature coefficient is on the same order as that of the ST-cut quartz substrate.

关键词： surface acoustic wave quartz Love wave temperature characteristics

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Optimal design of an inter-board strain-relief for high-reliability surface mount attachment

Optimal design of an inter-board strain-relief for high-reli...

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Electronic Components and Technology Conference (ECTC)

作者： R.W. Kotlowitz K.L. Terrell Network Wireless Systems Business Unit AT and T Bell Laboratories Whippany NJ USA Graduate Program in Mechanical Engineering New Jersey Institute of Technology Newark NJ USA

The long-term reliability of surface mount (SM) interconnections remains an important issue in many electronics packaging technologies. Strain-reliefs with sufficient compliance can minimize the cyclic loads impressed on SM solder connections during operational temperature excursions, appreciably increasing the margin for long-term attachment reliability. Compliance evaluation was performed for an inter-board strain-relief, or bond-strap, in a commercial Low-Noise Amplifier (LNA) used in various AT&T wireless transmission systems. The bond-strap compliance was optimized, within practical forming and assembly constraints, to provide robust SM interconnection during the expected product service life.

关键词： Samarium Bonding Electronics packaging Surface-mount technology Temperature Performance evaluation Low-noise amplifiers Constraint optimization Assembly Robustness

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