日本財団 図書館


21. University of Tokyo Department of Environmental and Ocean Engineering
 
Research Period Researcher(s) Outline
Plan 2002
1. Development of simulation performance of ships in sea conditions 3 1 M. Miyata S. Orihara Ship performance at sea is investigated during the whole life of the ship by a simulation technique using CFD to design ships securing safety and economy.
2. Development of an optimization technique for an automatic ship hull design system 3 1 M. Miyata Ship design and drawings are still complicated and using highly sophisticated techniques to have competitive power in the marine industry. In addition to investigating CAD and CFD, the combination of modeling and optimization of an intelligence system is conducted to solve the problem.
3. Development of a dynamic simulation model on the transport flow of commodities 3 1 M. Miyata Road, harbor and ship facilities for the transport of commodities in Japan are customarily produced as transport means without intention to be scientifically logical. The productivity of the domestic transport of Japan is 65% of that of USA. Simulation techniques of the network and flow in the transportation system are formulated in a discrete form. Then, the flow network and hardware of the transportation system are optimized.
4. Ship design and its operation in the domestic transport system of commodities 2 2 H.Yamato S. Shirayama H. Masuda I. Watanabe H. Andoh Y. Yamauti Mathematical programming and simulation based on evaluation of the domestic maritime line will pertain to designing domestic routes, ships, types and operation.
5. Basic research on the application of a visualization method for a design system 2 2 S. Shirayama H. Andoh H. Masuda H. Yamato I. Watanabe K. Saitoh Integration of design of and analytical systems on structure and fluid elements is very important in the ship production process. However, integration is seldom used in the process in spite of the necessity of applying intelligent visualized information. How to feedback the results of intelligent information to the design system remains a problem.
6. Basic research on the design system of a the network 2 2 H.Yamato S. Shirayama H. Andoh H. Masuda Basic CAD architecture applied to shipbuilding networks that mainly consists of cooperative work is discussed.
7. Total safety assessment of ships 5 4 H. Yamato It is necessary to establish an assessment system with minimum cost to maintain and improve safety and the environmental level of ships. Therefore, construction of a safety assessment system, construction and consolidation of a database system, and utilization of accident information will be undertaken. The results of FSA (Formal Safety Assessment) in Japan will be recommended to IMO at an appropriate time.
8. Application of wearable computers in shipyards 2 2 H. Yamato H. Masuda S. Shirayama S. Enomoto N. Mishida The combination of a wearable computer and communication system will be constructed. Now, a measuring and monitoring system will be constructed.
9. Maritime transportation in Indonesia 2 2 H.Yamato Suprayogi A design method for a maritime transportation network in Indonesia is discussed using a mathematical model method, in particular, by integral numbers and simulation. This work is in cooperation with Hiroshima University and part of a fund from the Japan Society for the Promotion of Science.
10. The boundary streamline method 2 2 S. Shirayama Suprayogi A boundary streamline method is good for visual representation and strongly correlates with separation the flow at the stern of a ship and generating a vortex in the wake. It provides useful information on improving ship hull design. Therefore, it is necessary to show boundary streamline with accuracy. The CFD calculation indicates the problem of different patterns with the available visual software. This study performs a simulation analysis, and a high accurate boundary streamline method will be developed.
11. The CAD system for the specification and installation of shipbuilding design with built-in intelligence 2 1 H.Yamato H. Masuda S. Shirayama H. Andoh M. Satoh T. Karasawa In ship design in the initial stage, it is usual to use a handbook or a design manual as stored data. This study develops this function for the future by using computers as an effective way to store digital data.
12. Construction of a bridge work assistant system by a dynamic work flow management system 2 1 H. Andoh In ship navigation, it is necessary to obtain overall information of physical objects. Then, to control the ship correctly, a system considering individual work as well as team-work should be constructed. This study adds to the navigation information gained by ARPA and ECDIS, performs information processing of conversation between crew members crews and analyses crew work position at the bridge to develop a work monitoring technique by computer. Objects and resources are evaluated based on the information acquired. Through the analysis, a work assistant system for ship navigation is developed.
13. Development of a numerical estimation method for floe (floating ice) movement 3 3 H. Yamaguti A flow of floes is simulated numerically with a new floe model formulated with discrete-type characteristics. The simulation technique can be applied to floe movement from a global scale to a small, regional scale with suitable accuracy and calculation time. The combination effect of floe and sea-water is also calculated.
14. Development and application of GIS (Geographic Information System) for polar environment engineering 4 4 H. Yamaguti GIS (Geographic Information System) for polar environment engineering is developed to input data into the system. Floe data monitored by artificial satellite can estimate the floe movement by a computer prediction program with a linkage of software already developed. The change and assessment system of the environmental effect on the polar region is constructed for prediction.
15. Development of a numerical model for unsteady cavitation flow 2 1 T. Kawamura A numerical model of unsteady cavitation flow model is developed for a propeller and a two-dimensional blade.
16. Water treatment by water jet cavitation 4 3 T. Kawamura Super sonic induced by cavitation breaks down harmful organic compounds such as PCB into harmless elements in water. This study applies collapsing energy of cavitation using water jet to discompose organic material when a bubble in the jet cavitation collapses. The generation mechanism of shock pressure wave is investigated when water is jetted.
17. Application of a microscopic approach to the destruction mechanism 5 1 H. Yoshinari S. Kaneda A. Morita To clarify the mechanism of ductile, tensile and fatigue destruction, this study investigates the behavior of destruction to a micro scale smaller than crystal scale.
18. Assessment of destruction strength for welded steel structures 3 1 H. Yoshinari S. Kaneda The safety assessment of destruction on welded steel structures with flaws is evaluated experimentally and analytically. Also, it is discussed in view of reliability engineering.
19. The stop mechanism of high speed brittle crack propagation 3 2 H. Yshinari S. Kaneda The stop mechanism model of brittle crack propagation is constructed on a crystal scale level based on local stress theory. The stop behavior of crack propagation is performed, especially for steel structures.
20. Development technique for a large-scale model 5 5 T. Nomoto The SODAS system was developed based on results that were used for system development for CIM in shipbuilding, and has been performed for the past ten years. Reviewing the process, a development technique of for large-scale systems is discussed in general. This study performs a conversion from the development of a shipbuilding system to study for system development.
21. Application of a product model 5 5 T. Nomoto It is important to construct a model of production in system development for CIM in shipbuilding. After constructing a product model, it is necessary to use the model effectively. Integration of FEM analysis, CAE system and the simulation system have been discussed. A system to improve the accuracy of product and safety information of factory is investigated to integrate the systems.
22. Information acquisition of design and production for shipbuilding CIM 5 4 T. Nomoto Modeling in shipbuilding has been performed to apply CIM to shipbuilding by integrating CAD and CAM. The system model from design to the manufacturing stage in the shipbuilding industry in general was developed in view of the product model and its function. Reviewing this, the system now needs to be reconsidered considering reconstructing process information.
23. Divided command design policy (top down design policy) in the production system 5 2 K. Aoyama System design and the construction of a product and intricate systems that are composed of many elements are investigated. The fundamental concept of design is to decompose design policy that is an expansion of top down design. Design in general starts from a conceptual design or a basic design then gradually progresses to a detailed product, giving concrete parts information. This design flow does not admit the idea that all information of each component and manufacturing stage of the completed product can be decomposed. The design flow of each stage is considered as added suitable information and necessary and sufficient conditions are decided as the need arises. Integrating information among elements will improve the design of the system and make it more sophisticated.
24. Construction of top down design tool aiming to assist an artificial satellite in the initial stage 5 2 K. Aoyama As the performance and cost of a product are almost always determined in initial stage of design, overall judgement is required from a number of points of view. To assist design in the initial stage, it is necessary to have an integrated environment. An information model or target design parts should be presented as a substance and an attribute. The design assistant system and its environment are proposed through an information model visually combined by the designer. The function of a large-scale artificial satellite system is closely connected with the substance of the satellite itself, the launching rocket and the ground control system. The top down design system in the design of a satellite with a process manager who can assist the design on a trial and error basis in design and analysis is applied in the initial design stage.
25. Management of interface information in module design 5 3 K. Aoyama Module design is focused on as the tendency from mass production with few kinds to small-scale production with many kinds, and the life cycle of a product is considered. In module design, in addition to the combination of the module to manufacture a product, it is important to consider interface connection between each module. However, there is no design assist system to control the connection of interfaces in an integrated manner at present. This study concentrates on the potential of a real module design and a computer assisted system.
26. Construction of a knowledge management system in safety information 3 1 K. Aoyama About 2000 workmen die a year through accident in Japan. Safety consciousness and risk assessment is important due to the global establishment of ISO12100. As it is important to secure safety at the production site especially in the manufacturing and construction industries, there is no trial to investigate the work safety in advance using a computer system. Targeting large-scale products such as ships a steel structures, the basic concept of an assistant system with appropriate measures for risk and a prototype system constructed by the author are investigated. The system defined as assisted design is also developed, effectively utilizing combined information aiming at risk assessment and work safety.
27. A factory planning assistant system at each stage and factory simulation 3 3 K. Aoyama To realize productive activity effectively, it is necessary to obtain planning information on production. Howevergenerating planning information should focus on various products and consider restriction on manufacturing flow in the factory. Planning information also requires skill. In the initial stage of design, it is very important to draw up a suitable, realizable plan.
28. Systematization of inherent technical skill in production 3 1 S. Taketi In the recent manufacturing industry, there is a serious problem of skill transmission. This study clarifies the metrics of manufacture (a mathematical model of economical and analytical estimation referring to productivity, determination of quality assurance and acquisition of productive data in a manufacturing system). In addition, best practice by skillful technicians is clarified, and there is an overview of a new manufacturing system different from conventional methods. Then, the systematization of skill transmission is established.
29. Ocean storage of carbon dioxide 5 1 H. Suzuki K. Enomoto To curb global warming, the possible separation and collection techniques for carbon dioxide, a global warming gas, is discussed. A proof experiment is planned. In the experiment, the design of a deep sea piping system to lead carbon dioxide from an experimental ship to the sea bottom targets technical problems of strength, behavior and installation.
30. Basic research on a damage diagnosis system for large structures 3 2 H. Suzuki N. Oka Maintaining the integrity of large structure systems, enormous efforts are concentrated on inspecting damage in every part of a structure. Basic research is conducted on the ejection of elastic waves into the structure material that makes it possible to detect the scale of damage and the location through the transmission behavior of elastic waves.
31. Analysis of shaft flexure behavior and control of a deep sea riser system 4 1 H. Suzuki K. Enomoto In Japan, there is a project to use a deep sea digging technique extending down to 4,000 m that will be the deepest world record. A riser utilized in the digging system relatively weakens the strength of a structure. This is because of shaft and flexure vibration. This is a serious problem in riser design. Analysis and control methods of this system are discussed.
32. The optimized structure of the semi submersible mega float 3 1 H. Suzuki N. Oka Response characteristics of a submersible mega float are basically clear and performance has confirmed even under rough sea conditions. However, the optimization of the structure has not been discussed. This research discusses form of the structure, the size of components and system installation in view of floating shape asymmetry or disproportion.
33. Floating wind farms 3 1 H. Suzuki N. Oka As wind conditions are stable at sea, the generation of electricity by floating wind farms looks very promising. A floating wind farm is inexpensive to transport and install. On the other hand, the expense of a floating system is a disadvantage. The application of SPAR to an effective float form and ideas for optimization are discussed.
34. Exploitation of methane hydrate 2 1 H. Suzuki K. Enomoto Promised sea areas for exploiting methane hydrate are located in the south sea trough in the Pacific Ocean. As the sea of the site is rough because it is a typhoon route and due to the flow effect of the Kuroshio sea current, strict regulation is required in the design of the system. The endothermic reaction of methane hydrate and that its reaction is fundamentally ineffective are discussed. The system should be small and lightweight, with good cost performance and high efficiency.







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