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Finite Element Analysis and Topology Optimization Design of Anchor Mooring Winch Support Bracket

IOP Conference Series: Earth and Environmental Science 2022年第1期972卷

作者： Nurul Huda Ocid Mursid -Mechanization Fisheries Study Program Sorong Polytechnic of Marine and Fisheries Indonesia Department of Naval Architecture Diponegoro University Indonesia

The weight of the deck machinery greatly affects the position of the small ship's center of gravity so that it also affects the stability of the ship. Therefore, it is necessary to conduct optimization studies to reduce the weight of ship deck machinery, especially anchor mooring winch, by reducing the weight of ship deck machinery will lower the position of the center of gravity of ship so that can improve ship stability. This paper presents the effects of a topology optimization examination based on the finite element evaluation on anchor mooring winch support bracket using the SolidWorks Simulation module. The main intention to examine is to optimize the general weight of the anchor mooring winch support bracket via way of means of thinning specific regions of the anchor mooring winch support bracket in keeping with the calculated minimum strain energy. The topology optimization algorithm that is used in the current study gives an optimal structural shape of the support bracket of the anchor mooring winch with the largest stiffness, considering the given quantity of mass so that it will be eliminated from the preliminary layout space. The complete sequence of steps for carrying out the topology control optimization study is shown, taking into account the constraints arising from the construction features and the method of manufacturing the support bracket of the anchor mooring winch. The layout became carried out, and the effects have been provided via way of means of evaluating the preliminary version and the optimized version. As the result of topology optimization study, its stress was increased by about 4MPa and mass was reduced by about 15kg in comparison with the initial design.

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Development of an Automatic Anti Pitching System (APS) Autonomous Surface Vehicle (ASV) for Fish Mapping

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Journal of Physics: Conference Series 2020年第3期1569卷

作者： Noverdo Saputra Muhammad Arifudin Lukmana Purwo Joko Suranto Study Program Naval Architecture Universitas Pembangunan Nasional Veteran Jakarta Indonesia Study Program Mechanical Engineering Universitas Pembangunan Nasional Veteran Jakarta Indonesia

The common problem occurs in fish mapping using autonomous surface vehicles (ASV) is pitching stability. Some researchers have indicated that problem affects the results of mapping. The target of this system is to design an Autonomous Pitching System (APS) for ASV using numerical simulation software. The simulation is done by implement APS into the system, producing an oscillatory motion from the ASV. For both dynamics of craft in short and long periods, APS with proportional controller (P), proportional-integral controller (PI), and proportional-integral-derivative controller (PID) are developed in order to minimize the oscillatory behaviour. It was found that for the short period dynamics, the APS with PI controller was the optimal controller, followed by the PID controller and then the P controller. For the long period dynamics, the APS with PID controller was optimal.

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DispSegNet: Leveraging semantics for end-to-end learning of disparity estimation from stereo imagery

arXiv

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arXiv 2018年

作者： Zhang, Junming Skinner, Katherine A. Vasudevan, Ram Johnson-Roberson, Matthew Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Robotics Program University of Michigan Ann ArborMI48109 United States Department of Mechanical Engineering University of Michigan Ann ArborMI48109 United States Department of Naval Architecture and Marine Engineering University of Michigan Ann ArborMI48109 United States

Recent work has shown that convolutional neural networks (CNNs) can be applied successfully in disparity estimation, but these methods still suffer from errors in regions of low-texture, occlusions and reflections. Concurrently, deep learning for semantic segmentation has shown great progress in recent years. In this paper, we design a CNN architecture that combines these two tasks to improve the quality and accuracy of disparity estimation with the help of semantic segmentation. Specifically, we propose a network structure in which these two tasks are highly coupled. One key novelty of this approach is the two-stage refinement process. Initial disparity estimates are refined with an embedding learned from the semantic segmentation branch of the network. The proposed model is trained using an unsupervised approach, in which images from one half of the stereo pair are warped and compared against images from the other camera. Another key advantage of the proposed approach is that a single network is capable of outputting disparity estimates and semantic labels. These outputs are of great use in autonomous vehicle operation;with real-time constraints being key, such performance improvements increase the viability of driving applications. Experiments on KITTI and Cityscapes datasets show that our model can achieve state-of-the-art results and that leveraging embedding learned from semantic segmentation improves the performance of disparity estimation. Copyright © 2018, The Authors. All rights reserved.

关键词： Semantic Segmentation

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THE SURFACE EFFECT CATAMARAN - PROGRESS IN CONCEPT ASSESSMENT

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naval ENGINEERS JOURNAL 1983年第3期95卷 301-311页

作者： WILSON, FW VIARS, PR ADAMS, JD Fred W. Wilson:received his B.A. degree from the Virginia Polytechnic Institute and State University in 1967 and his M.A. degree from the University of Tennessee in 1971. Mr. Wilson has been involved with air-supported vehicle technology at the Aviation and Surface Effects Department of the David Taylor Naval Ship Research and Development Center since 1967. Until 1979 Mr. Wilson was with the Surface Effect Ship Division and participated in early SES development the SES-100A and -100B trials and in the 3000-ton SES program. Since 1979 Mr. Wilson has been in the Program Development Office participating in aircraft programs as well as the current twin-cushion surface effect ship (Surface Effect Catamaran) program. Philip R. Viars:graduated from the University of Cincinnati with a B.S. in Aerospace Engineering in 1974. He received his M.S. in Ocean and Marine Engineering from George Washington University in 1980. Since 1972 Mr. Viars has worked in the Aviation and Surface Effects Department at the David Taylor Naval Ship Research and Development Center (DTNSRDC). While at DTNSRDC Mr. Viars has participated in model and full-scale experimental programs focused on simulation. Mr. Viars is recognized as the Center expert in SES stability and performance having participated in most of the manned Navy SES testcraft evaluations. Since 1981 Mr. Viars has been in the Program Development Office where he has worked on the twin-cushion surface effect ship (SECAT) and other programs. John D. Adams:received his B.S.E. in 1972 from the University of Michigan School of Naval Architecture and Marine Engineering. He has spent seven years in Marine engineering research Marine systems design and development and dynamic tow tank testing and data analysis. Mr. Adams is currently responsible for the Maritime Dynamics Inc. field operation at the U.S. NavySES Test Facility (SESTF) Patuxent River Maryland. On-site responsibility has been the design development and manned testing of active ride control systems for the U.S. NavyXR-

The surface effect catamaran incorporates twin high length-to-beam cushions to support a low length-to-beam platform. The performance characteristics of the resulting vehicle, i.e., the resistance and head sea motions, are equivalent to a higher length-to-beam surface effect ship. The high lateral stability which results from the widely spaced hulls and cushions of the surface effect catamaran provides several advantages not inherent in conventional surface effect ship configurations. These advantages are manifested by high cross-structure height and reduced structural loads without reduction in static or dynamic roll stability. For an 800-ton ship the widely spaced cushions provide a capability of controlling off-head sea types of motions and the virtual elimination of green water over the deck up through Sea State 6. Model tests have validated cushionborne and hullborne resistance computer prediction programs. Head sea motions tests have justified the use of high cross-structure height to minimize high slam types of structural loads. Preliminary design and model tests indicate the potential for the surface effect catamaran to operate as an open ocean ship in smaller sizes than heretofore thought possible. In addition, its planform and large volume provides pay-load capabilities of much larger ships.

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Robust design from systems physics (vol 10, 14334, 2020)

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SCIENTIFIC REPORTS 2020年第1期10卷 1-16页

作者： Klishin, Andrei A. Kirkley, Alec Singer, David J. van Anders, Greg Department of Physics University of Michigan 48109 Ann Arbor MI USA Center for the Study of Complex Systems University of Michigan 48109 Ann Arbor MI USA John A. Paulson School of Engineering and Applied Sciences Harvard University 02138 Cambridge MA USA Naval Architecture and Marine Engineering University of Michigan 48109 Ann Arbor MI USA Department of Physics Engineering Physics and Astronomy Queen''s University K7L 3N6 Kingston ON Canada

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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AUXILIARY SHIP HULL FORM DESIGN AND RESISTANCE PREDICTION

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naval ENGINEERS JOURNAL 1988年第3期100卷 275-292页

作者： FUNG, SC The author is a naval architect with the Preliminary Design Division of the Naval Sea Systems Command. Mr. Fung graduated from National Cheng Kung University in 1976 and Stevens Institute of Technology in 1977 from which he received his B.S. degree in naval architecture and marine engineering and M.S. degree in ocean engineering respectively. He started his career with M. Rosenblatt and Son in 1979 and became a senior naval architect with the Hull Form & Hydrodynamics Department in Designers and Planners in 1981. For the past ten years Mr. Fung has performed a variety of tasks in the area of feasibility study hydrodynamic design including advanced marine vehicles bulbous bows and hull form design for surface combatant and non-combatant ships. Currently he is a project naval architect for the T-AO twin skeg integrated hull design and the AE-36 Energy Enhancement Program. Mr. Fung is a member of ASE ASNE and SNAME. He received the John C. Niedermair A ward in 1984 and 1986 for the best paper presented at the ASE annual technical symposiums.

In this paper 154 auxiliary type monohull designs are analyzed for guidance on how to select the appropriate hull form parameters, particularly with regard to the effects of hull section shapes, sectional area and design waterline curves on ship resistance. This paper also discusses the resistance predictions based on (1) the statistical approach and (2) the use of series model test data (such as Taylor's standard series) and associated “worm curve factors” with the help of data management software.

关键词： SHIPS

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Survey of reduced workload and crewing strategies for ocean patrol vessels

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naval ENGINEERS JOURNAL 2001年第2期113卷 29-44页

作者： Baker, C Krull, R Snyder, G Lincoln, W Malone, TB Clifford C. Baker CIE CHFEP is a senior staff scientist at Carlow International Incorporated. He has applied most of his 24 years of experience in the application of human engineering technology to maritime systems. Mr. Baker has directed much of Carlow's efforts to reduce ship workload and to improve human performance and maritime safety through application of human factors methods and data. He is a Certified Industrial Ergonomist (CIE) as well as a Certified Human Factors Engineering Professional (CHFEP). Both certifications were granted by Oxford Research where Mr. Baker also serves as an Advisory Board member. Russell D. Krull P.E. is a senior engineer with A&T/Proteus Engineering with more than 18 years of experi-ence in marine engineering naval architecture and program management including 16 years of active duty in the U.S. Coast Guard. Recent experience includes advanced ship design studies engineering software development technical support for the USMC Advanced Amphibious Assault Vehicle propulsion systems analyses ship structural engineering and cargo handling systems engineering. Mr. Krull has an M.S.E. in naval architecture and marine engineering and an M.S.E. in industrial and operations engineering from University of Michigan and a B.S. in ocean engineering from the U.S. Coast Guard Academy. Capt. Glenn L. Snyder USCG. Regrettably since this paper was originally written Capt. Snyder has passed away. At the time of his death he was an operations specialist assigned to the Coast Guard's Deepwater Capabilities Replacement Project as Chief of Human Systems Integration. He served as commanding officer of the patrol boat Cape George (WPB-95306) the icebreaking tug Biscayne Bay (WTGB-104) and the cutter Legare (WMEC-911). A 1975 graduate of the U.S. Coast Guard Academy Capt. Snyder held an M.A. in national security and strategic studies from the U.S. Naval War College and an M.A. in international relations from Salve Regina College. In addition he was a 1998 fellow of the Foreign Service

The U.S. Coast Guard is in the concept exploration phase of its Integrated Deepwater System (IDS) acquisition project. This project will define the next generation of surface, air and command, control, communications, computers, intelligence, surveillance, and reconnaissance (C4ISR) assets used to perform the Coast Guard's missions in the IDS environment (>50 NM off the U. S. coastline). As part of early technology investigations, the needs exist to: (1) analyze the workload requirements of the IDS, (2) identify alternative means to perform ship's work, and (3) optimize ship manning consistent with ship workload, performance criteria, and the available tools and equipment aboard. To reduce shipboard work requires an understanding of the mission and support requirements placed on the vessel and crew, how these requirements are currently met, and how requirements might otherwise be met to reduce workload and crew size. This study examined currently implemented workload and manpower reducing approaches of commercial maritime fleets, U.S. and foreign navies, and foreign coastguards. These approaches were analyzed according to evaluation criteria approved by the IDS acquisition project team. From this, strategies for shipboard work reduction that may be considered for adoption by the IDS were identified and analyzed according to performance and costs factors. Ten workload-reducing strategies were identified: damage control, bridge, multiple crewing, engineering, risk acceptance, modularity, deck, enabling technologies, ship/personnel readiness, and operability and maintainability.

关键词： naval vessels

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DESIGN OF THE NFR-90

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naval ENGINEERS JOURNAL 1991年第2期103卷 29-49页

作者： SCHAFFER, RL KLOEHN, HG Roger L. Schaffer is currently the manager of preliminary design for Advanced Marine Enterprises in Arlington Virginia. Mr. Schaffer received bachelor degrees in naval architecture and marine engineering and aerospace engineering from the University of Michigan in 1971. In 1974 he received his master's degree in naval architecture from MIT. Mr. Schaffer started his career with the Naval Ship Engineering Center and has worked for Boeing Marine Systems Hydronautics and Designers & Planners. He was associated with various phases of the NFR-90 program from 1982 until. 1990. His last NFR-90 assignment was design integration manager for the International Ship Studies Company (ISS) in Hamburg West Germany where he was responsible for all naval architectural work as well as combat system installation and marine engineering integration with the platform. He is a registered professional engineer. Harvey G. Kloehn received his B.S. degree in electrical engineering from Marquette University in 1951. He went to work in the Bureau of Ships and spent 32 years in naval combat systems engineering. Mr. Kloehn also served on active duty in the U.S. Navy from 1955 to 1958. Mr. Kloehn retired from the Naval Sea Systems Command in 1985 as technical director to the deputy commander for AAW/surface warfare. He is a charter member of the Senior Executive Service. After a brief retirement he went to work for NKF Engineering and then for Westinghouse as ship design manager and later chief engineer of the NA TO Frigate Program assigned to Hamburg West Germany. Mr. Kloehn received the ASNE Jimmie Hamilton award for the best paper published in the Journal in 1972. He is a registered professional engineer.

The NATO Frigate Replacement for the 1990s (NFR-90) Project was a unique approach to naval ship design and acquisition. It would have been the first U.S. Navy surface combatant primarily designed by an international organization. As a planning scenario, up to 60 ships, including 18 for the U.S. Navy, were to be acquired by the eight participating nations, making it potentially the largest NATO project ever attempted. Approximately 1,000 man years over a 10-year period were invested in the project. The project was prematurely terminated in January 1990. Nevertheless, a significant amount of work had been completed;the basic design of the ship was firmly established by a preliminary design, the combat system was thoroughly studied, and the economics of the program were well established. This paper describes the project, the technical aspects of the ship and combat system design, its innovative features and significant economic advantages. The conclusions relative to Aegis vs. NFR-90 or NFR-90/ Aegis mix (Table 14) are the opinions of the authors and the estimates of associated costs have not been validated by the naval Sea Systems Command.

关键词： naval Vessels

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HYDROFOILS

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naval ENGINEERS JOURNAL 1985年第2期97卷 142-199页

作者： JOHNSTON, RJ Capt. Robert J. Johnston USNR (Ret.) began his professional career as an engineering officer in the U.S. Navy. His last assignment before leaving the Navy in 1954 was hydrofoil program officer in the Office of Naval Research. In 1954 he joined Miami Shipbuilding Corporation later becoming that company's president. Miami Shipbuilding was heavily involved in a number of hydrofoil development programs including the hydrofoil landing craft Halobates. In 1960 he joined the Grumman Corporation where he ultimately became director of marine programs. At Grumman he was responsible for a number of major projects including H.S. Denison for the Maritime Administration the Navy hydrofoils Plainview (AGEH-I) and Flagstaff (PGH-1) and the Grumman passenger hydrofoil Dolphin. In 1973 he returned to government service as a civilian in the position of technical manager of hydrofoil development at the Naval Ship R&D Center. For his work in this role he received the Navy Superior Civilian Service Award in 1981. He retired in 1982 and founded Advanced Marine Systems Associates Inc. a firm of which he is president. AMSA only recently completed a worldwide study of high-speed waterborne transportation for the Urban Mass Transportation Agency.

In the family of modern ships and craft, the hydrofoil ship is a well-developed concept whose maturity has been demonstrated through many successful commercial and military applications. This article has been prepared by a team of experts who have gained knowledge and experience by being directly and intimately involved in the development of the hydrofoil. The article reviews design concepts, control systems, propulsion methods, and attributes and limitations of the hydrofoil.

关键词： HYDROFOILS

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Dynamic and static characteristics of air cushion vehicles

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naval ENGINEERS JOURNAL 1995年第6期107卷 93-94页

作者： Riley, WB At the time this article was written William B. Rileywas a student at Edison High School Alexandria. Virginia. He served as president of the school's JETS group a student organization that encourages the study of engineering mathematics science and technology. Mr. Riley was a participant in the ASNE Day 1995 student science fair. His project was also displayed at the 46th International Science and Engineering Fair held in Hamilton Ontario Canada earlier this year. His career interest is in naval architecture and marine engineering. Mr. Riley is currently attending classes at the College of Engineering Cornell University.

This project investigates air cushion vehicle operation and the viability of deploying a hybrid vehicle. The air cushion vehicle is constructed to use a centrifugal fan for lift and two axial fans for propulsion. The model if fully controlled by remote. The hybrid vehicle is constructed to use the same platform and lift system as the air cushion vehicle, but instead of using axial fans for propulsion, a wheeled assembly is substituted. Thus the craft is lifted by the air cushion but is propelled by the wheels. A conventional wheeled vehicle is also used for comparison.

关键词： Air cushion vehicles

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