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Improvement of product strength and press formability of Al-Mg-Si alloy sheets by resistance heat treatment and artificial aging

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Keikinzoku/Journal of Japan Institute of Light Metals 2006年第6期56卷 313-316页

作者： Ishiguro, Minoru Maki, Seijiro Mori, Ken-Ichiro Doctoral Program of Mechanical and Structural System Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi-shi Aichi 441-8580 Department of Production Systems Engineering Toyohashi University of Technology Toyohashi-shi Aichi

A treatment consisting of resistance heat treatment and artificial aging was developed to improve the product strength and press formability of Al-Mg-Si alloy sheets having paint bake hardenability used for automobile body panels. In this treatment, the sheets are re-solution heat-treated by resistance heating and water quenching just before the press forming. The formed sheets are artificially aged just after the press forming to increase the product strength. In the experiment, Al-0.60%Si-0.74%Mg (A6061) alloy sheets were chosen. The solution heat treatment of the sheets was sufficiently accomplished by the rapid resistance heat treatment, and the press formability of the sheets was improved. The hardness of formed products is increased by the artificial aging and paint bake hardening. It was found that the present heat treatment is effective in improving the product strength and press formability of the Al-Mg-Si alloy sheets having the paint bake hardenability.

关键词： Aluminum alloys

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Bartolomeo micro-g disturbance control at payloads 69

Bartolomeo micro-g disturbance control at payloads

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69th International Astronautical Congress: #InvolvingEveryone, IAC 2018

作者： Sgobbo, Riccardo Abdoly, Kiyoumars Steimle, Per-Christian Airbus Defence and Space GmbH Mechanical Engineering Airbus Allee1 Bremen28199 Germany System Architecture Expert for Structural Dynamics and Mechanics United States Bartolomeo Program Manager United States

The European external platform "Bartolomeo" is an enhancement of the European International Space Station (ISS) module "Columbus". Its infrastructure is motivated by the shortage in availability of ISS external sites and the need to improve capabilities to keep the station attractive for new upcoming space missions. Designed to user requirements from the commercial and institutional sector, Bartolomeo is a new ext ernal payload hosting facility which is mechanically attached to the ram-facing primary and secondary trunnions on the ram side of Columbus. Thermal and dynamic stability of the payloads are the primary missions of Bartolomeo environment. Micro -g disturbances control is vital for the operation of the payloads outside the International Space Station. Therefore Bartolomeo is designed to provide a smooth dynamic environment towards on -orbit random vibration levels from low to high frequency. For each payload an isolation device will be developed by Airbus Defence and Space in Bremen in order to provide a guaranteed payload comfort. In order to determine the efficiency of insulation a preliminary analysis is necessary to investigate the sensitivity of payloads with respect to their position, mass, Center of Gravity (CoG) towards frequency range. The insulation device shall reduce the resonance of the amplification for certain frequencies without shifting the effect to other frequency ranges. The possible mode cou pling of Bartolomeo payloads and the platform itself to the Columbus Module is also investigated in this paper. The effect of soft - mounted attachments between Bartolomeo and Columbus is included in this investigation. A modal survey test and random vibration tests will be used for the external correlation of the mathematical model of Bartolomeo and in addition they will support this analysis. Existing spectra for other payloads platform mounted on the ISS (ELC, ExPress Logistic Carrier) are taken as reference, modifying the excitation to start fro

关键词： Gravitation

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16-IN GUN BLAST AND THE BATTLESHIP REACTIVATION program

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NAVAL ENGINEERS JOURNAL 1987年第3期99卷 227-238页

作者： YAGLA, JJ The authorreceived his B. A. degree in science (physics) from the State College of Iowa in 1965. He received his M. S. degree in engineering mechanics in 1968 and his Ph.D in aerospace engineering and engineering science in 1981 from Arizona State University. He has done analytical and experimental research in the field of weapons blast since 1965 at the Naval Surface Weapons Center in Dahlgren Virginia. As a supervisory research mechanical engineer he was previously head of the Physical Response Analysis Branch Blast Effects Branch and Ship Engineering Branch. Dr. Yagla is the test development agent and was test conductor for the gun and missile structural test firings in USS Iowa class battleships. He is a consultant to the Naval Sea Systems Command battleship combat system engineer and the Naval Air Systems Command Cruise Missile Project for blast and structural response. He is presently analyzing shock and vibration problems for the Standard Missile Program Office.

Reactivated and modernized USS Iowa class battleships employ many new systems, none of which were designed to withstand blast from 16-inch guns. Placement of the new equipment was driven by the need to impose the smallest possible restrictions on the guns. The design problem was complicated by two factors: first, the blast overpressure field surrounding the gun had not been accurately measured with modern instruments. Second, the blast overpressure tolerance of several important systems was unknown. The problem was solved through judicious placement of the equipment so that work could begin on the ship. Meanwhile the pressure surrounding a 16-inch gun was measured at the Dahlgren Laboratory. Mathematical functions describing the blast field were then used to design shipboard experiments in which the guns were fired at progressively more severe angles of train and elevation, while the equipment performance was carefully monitored. Four sets of shipboard experiments were required. Limiting values for the firing arcs have been determined, and the consequences of exceeding the recommended limits are now known.

关键词： WARSHIPS

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ROCKET MOTOR DESIGN FOR UNDERWATER SHOCK

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NAVAL ENGINEERS JOURNAL 1988年第3期100卷 215-225页

作者： YAGLA, JJ The authorreceived his B.A. degree in science (physics) from the Slate College of Iowa in 1965. He received his M.S. degree in engineering mechanics in 1968 and his Ph.D. in aerospace engineering and engineering science in 1981 from Arizona State University. He has done analytical and experimental research in the field of weapons blast and dynamical response since 1965 at the Naval Surface Warfare Center in Dahlgren Virginia. As a supervisory research mechanical engineer he was previously head of the Physical Response Analysis Branch Blast Effects Branch and Ship Engineering Branch. Dr. Yagla is the test development agent and was test conductor for the gun and missile structural test firings in USSIowaclass battleships. He is a consultant to the Naval Sea Systems Command battleship combat system engineer and the Naval Air Systems Command Cruise Missile Project for blast and structural response. He has been involved in the development of Standard missile and its launching systems since 1969. He participated in the design of shock tests for the Mk 104 rocket motor and analyzed the data. He is presently analyzing shock and vibration problems for the Standard Missile Program Office.

Naval ships and equipment are designed to survive underwater shock. The underwater shock can result from a nearby explosion of a bomb or missile, or the underwater detonation of a nuclear weapon. The shock wave travels through the water and applies an impulsive pressure load to the ship. The ship responds by a sudden acceleration in a direction up and away from the explosion. The motion of the ship is imparted to its weapons and equipment. In the case of Standard missile, impulsive loads are applied to the missiles stowed in the magazines. The evolutionary design of rocket motor chambers and launch shoes for Standard missile for underwater shock is traced from the early Tartar missile to the latest version of Standard missile. As the weight of the missile has increased and the performance requirements have become more demanding, the design of the weapon for underwater shock has become more difficult. The paper explains the design approaches and techniques. Theoretical and experimental methods have been required. Finally, the paper highlights the experiences and problems in conducting underwater shock experiments with production systems in ships at sea.

关键词： WARSHIPS

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A SUBMARINE CONTROL-system TEST VEHICLE

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NAVAL ENGINEERS JOURNAL 1980年第2期92卷 148-155页

作者： SEJD, JJ WATKINSON, KW HILL, WF Mr. James J. Sejd received his B.S. degree in Civil Engineering from Case Western Reserve University and has since undergone considerable graduate study at both The George Washington and American Universities. He served almost four years in the U.S. Navy as a Naval Aviator and enjoys the unique distinction of being qualified in both Heavier- and Lighter-than-Air aircraft. Early in his career he was employed at the Navy's Bureau of Ships in the capacity of a Structural Designer and Structural Research Monitor. In 1966 he joined the Staff of the Center for Naval Analyses where he was involved in the mathematical modeling of ships and aircraft and in economic “trade-off‘ analysis. In 1970. he went to the Naval Ship Engineering Center as an Operations Research Analyst in the Ship Design and Development Division. At the present time he is employed as a Program Manager for the Naval Sea Systems Command Ship Design Research and Development Office. A member of ASNE since 1973 he also is a member of the Association of Scientists and Engineers at NAVSEA the Operations Research Society of America and the Lighter-Than-Air Society. Mr. Kenneth W. Watkinson received both is B.S. and M.S. degrees in Engineering Science from Florida State University in 1970 and 1971 respectively. Since graduation he has been employed at the Naval Coastal Systems Center (NCSC). Panama City. Fla. where he is primarily involved in the investigation of the stability and control of underwater vehicles. For the past four years he has been the Task Leader and Principal Investigator for the NCSC portion of the Advanced Submarine Control Program involved in developing control design methods and the instrumentation system for the Submarine Control System Test Vehicle. Mr. William F. Hill is currently the ASCOP Program Manager at Lockheed Missiles & Space Company (LMSC) Inc. where he has the overall responsibility for design and construction of the Control System Test Vehicle (CSTV). He entered the aircraft industry in England as an Apprentice w

As part of the Advanced Submarine Control program (ASCOP), the Naval Sea systems Command has developed an open water Submarine Control system Test Vehicle (CSTV). This vehicle is a 1/12 scale model of an SSN 688 Class Submarine, with provisions for easy geometric changes. Such changes include alternate Sail size and location, the addition of parallel middle-bodies, alternative tail sections, and alternative control configurations. A self-contained instrumentation and control system provides the capability for “on-board” recording of all relevant Submarine-state variables, over the entire speed and depth range, to a degree of data accuracy exceeding any known system. With the means thus available to correlate measured vehicle hydrodynamics with selected maneuvers, conditions, and changes in hull geometry and control surface configuration, modern mathematical techniques for improving submarine equations of motion can be employed to permit dramatic design enhancements in both safety and performance. This paper provides the rationale and history of the development of this vehicle, a description of the instrumentation and control package, and a description of the vehicle itself.

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APPLICATION OF A GENERAL-PURPOSE CAD system IN THE DDG-51 DESIGN PROCESS

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NAVAL ENGINEERS JOURNAL 1988年第3期100卷 265-274页

作者： AYERS, RE CALLAHAN, PJ KASSEL, B Randy E. Ayers:is a naval architect in the Computer Aided Engineering Division (Sea 507) of the Naval Sea Systems Command. He received his B.S.E. degree cum laude in structural materials and fluids engineering from the University of South Florida in 1979. Mr. Ayers began his career in the naval shipbuilding industry as a structural design engineer for the Long Beach Naval Shipyard. Currently he is the computer applications manager for the DDG-51 consultant for other ship design projects and has special responsibility for teaching CAD applications and utilization. He has received a letter of appreciation for his work on the DDG-51 ship design and has earned several superior achievement awards while involved in such projects as the battleship modernization and CIWS. Mr. Ayers has been a project leader for the LHA and FF-1052 class of ships and for a number of other ships undergoing construction. He is also an active member of ASNE. Patrick J. Callahan:is the manager of the Computer Aided Design Branch of the Computer Applications Directorate at Designers & Planners Inc. Mr. Callahan worked at General Dynamics Electric Boat Division for 10 years where he was involved in CAD detail design efforts for the SSBN-726 class and the SSN-688 class submarines. In 1984 he joined M. Rosenblatt & Son Inc. and was CAD design supervisor overseeing the operations of their CAD system. Currently managing the CAD Branch at D&P he is responsible for a variety of CAD projects such as being a key member of the DDG-51 Computer Aided Ship Design Program developing procedures and documentation for systems operation. He served as project manager for the IGES conversion of 650 FFG-7 class drawings from a McAuto to a Computervision database. Most recently he was responsible for generating the digital drawing package for the AO-177 (Jumbo) contract design. Ben Kassel:received his BSME from the University of Maine in 1981 and joined the David Taylor Research Center as a mechanical design engineer and later became the CAD/CAM system

This paper describes how the Naval Sea systems Command (NavSea) applied computer-aided design (CAD) to the DDG-51 class ship design. CAD tools and techniques are described along with a discussion on how new modes of operation, procedures, and standards are being introduced to take full advantage of CAD technology. Because geometric modeling techniques and geometric model analysis are major purposes of a CAD system they are described in detail. An explanation of how the model interfaces with other design tools is also presented. A summary of the computer applications implemented during the DDG-51 design is provided and areas which require additional consideration and future development are identified.

关键词： WARSHIPS

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Numerical simulation on improvement of a Savonius vertical axis water turbine performance to advancing blade side with a circular cylinder diameter variations

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IOP Conference Series: Earth and Environmental Science 2018年第1期200卷

作者： P A Setiawan T Yuwono W A Widodo Student of Doctoral Program Mechanical Engineering Department Sepuluh Nopember Institute of Technology Surabaya 60111 Indonesia Marine Engineering Department Shipbuilding Institute of Polytechnic Surabaya Surabaya 60111 Indonesia Mechanical Engineering Department Sepuluh Nopember Institute of Technology Surabaya 60111 Indonesia Center of Excellence in Automotive Control & System Sepuluh Nopember Institute of Technology Surabaya 60111 Indonesia

The use of fossil fuel will generate particulate gas in the atmosphere and forming the greenhouse effect. One of the ways to reducing greenhouse effect is used renewable energy as hydropower without generating particulate gas impacted in human life. The present study uses hydropower as the renewable energy by using a Savonius turbine. The main objective investigates the performance of Savonius water turbine numerically due to the installation of a circular cylinder beside of the advancing blade with circular cylinder diameter variations. The method used is numerically toward Savonius turbine disturbed a circular cylinder. The numerical simulation using two-dimensional (2D) analysis of Computational Fluid Dynamics (CFD) simulation by using ANSYS 17.0-Fluent and sliding Mesh technique used is to solve the incompressible Unsteady Reynolds Averaged Navier-Stokes (URANS) equations. The turbulence model uses Realizable k-epsilon (RKE) and transport equation uses the finite volume discretization method with the second-order upwind scheme and the SIMPLE algorithm. Firstly, the numerical model has been validated by the published experimental data toward the torque coefficient by using air fluid at Reynolds of 4.32.105. Then the fluid is changed the water fluid at the same Reynolds. The circular cylinder diameter relative to the turbine diameter (ds/D) is varied of 0.1, 0.3, 0.5, 0.7 and 0.9 at X/D of 0.5 and Y/D of 0.7 kept constant with TSR of 0.5, 0.7, 0.9, 1.1 and 1.3. The numerical simulation uses the transient and two dimensional (2D) simulations. The results show that the increase of disturbance diameter (ds/D) will improve the performance of the conventional Savonius turbine and the maximum power coefficient increase about 18.04% at ds/D of 0.7 with TSR of 0.7.

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Investigations of feed drive trajectory errors by using artifact and optical scanning measurement

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AIP Conference Proceedings 2024年第1期3069卷

作者： Nasril Mahfudz Al Huda Tri Prakosa Sri Raharno Yatna Yuwana Martawirya Doctoral Program of Mechanical Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl. Ganesha No.10 Bandung 40132 Jawa Barat Indonesia Research Center for Process and Manufacturing Industry Technology National Research and Inovation Agency Kawasan PUSPIPTEK Tanggerang Selatan Banten 15314 Indonesia Research Center for Structural Strength Technology National Research and Inovation Agency Kawasan PUSPIPTEK Tanggerang Selatan Banten 15314 Indonesia Depatment of Mechanical Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl. Ganesha No.10 Bandung 40132 Jawa Barat Indonesia

Sensors and measurement systems have a key position in the production process in industrial 4.0. To optimize the quality of the production of workpieces that have complex surfaces, such as molds, dies, turbine blades, and others, it is necessary to develop machine tool metrology and machining strategies. So far, dynamic contouring especially trajectory has not been considered important, because they are still considered related to the feed motion. In this paper, an investigation of the trajectory errors of the servo feed drive system of the machine tool is carried out using an artifact and an optical scanning measurement system using a laser displacement sensor. The artifact is mounted on a machine tools table to realize the trajectory errors investigation of the feed motion. The laser displacement sensor can scan the surface of an artifact with sub-micron motion accuracy. To evaluate the measurement accuracy of servo feed motion, experiments to investigate trajectory errors were conducted, and the measurement system of the precision artifact is carried out by using the laser displacement sensor.

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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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Evaluating the impacts of environmental and human health of the critical minerals mining and processing industries in Indonesia using life cycle assessment

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Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Wahyono, Yoyon Sasongko, Nugroho Adi Trench, Allan Anda, Martin Hadiyanto, Hadiyanto Aisyah, Nyayu Anisah, Anisah Ariyanto, Novy Kumalasari, Isnaeni Putri, Virny Zasyana Eka Lestari, Mutia Citrawati Panggabean, Lambas Parlaungan Ridlo, Rohmadi Sundari, Sundari Suryaningtyas, Anissa Dewi Novianti, Endah Dwi Hakim, Muhammad Raihan Farras Prihatin, Anggara Lomak Matin, Hashfi Hawali Abdul Research Center for Sustainable Production System and Life Cycle Assessment National Research and Innovation Agency - BRIN Prof. BJ. Habibie Complex Area Banten Tangerang Selatan 15314 Indonesia Energy Security Graduate Program Republic of Indonesia Defense University IPSC Sentul Area West Java 16810 Indonesia Centre for Exploration Targeting School of Earth Sciences The University of Western Australia 35 Stirling Highway Crawley 6009 WA Australia UWA Business School 35 Stirling Highway Crawley 6009 WA Australia Environmental Engineering Murdoch University Murdoch 6150 WA Australia Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Central Java Semarang 50241 Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Central Java Semarang 50275 Indonesia Department of Mechanical Engineering Vocational School Gadjah Mada University Sleman Yogyakarya 55281 Indonesia Study Program of Environmental Science Faculty of Mathematics and Natural Science Universitas Sebelas Maret Central Java Surakarta 57126 Indonesia

The critical minerals industries in Indonesia may pose possible environmental and human health risks due to the release of pollutants into soil, water, and air, as well as the use of materials and energy. This study investigates the possible environmental and human health impacts of Indonesia's nickel, gold, copper, tin, and bauxite mining and processing industries. This study utilizes the latest version of the OpenLCA software, version 2.0, in combination with the Ecoinvent 3.8 database. To evaluate potential environmental consequences and health effects on humans, CML-IA Baseline and Environmental Priority Strategies (EPS) are employed in product development. The EPS system was developed utilizing a hierarchical methodology with the objective of furnishing the product developer with data regarding the financial impact of human health impairment resulting from a particular product development. The production of one tonne of gold, nickel, bauxite, tin, and copper results in the emission of 7.34.E+07, 4.61.E+04, 3.10.E+04, 1.02.E+04, 8.01.E+03 kg CO₂ eq/t, respectively, contributing to global warming. This production is associated with asthma cases of 7.79.E+01 (gold industry), 2.21.E−03 (copper industry), 1.81.E−03 (tin industry), 9.21.E−04 (nickel industry), and 4.71.E−06 (bauxite industry) Personyears/t. Electricity consumption and the release of carbon dioxide are the main factors contributing to global warming. The primary cause of asthma cases is the utilization of fuel oil and electricity. Power plant chimneys can employ various technologies, such as cyclones, bag filters, and scrubbers, to mitigate the release of polluting gas emissions. The critical mineral industry must prioritize handling and governing of steam power facilities to minimize their negative effects on the environment and human health. © 2024 The Authors

关键词： Critical minerals industries Environmental impacts Human health impacts Life cycle assessment

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