{"id":18,"date":"2024-02-26T10:43:37","date_gmt":"2024-02-26T01:43:37","guid":{"rendered":"https:\/\/www-naoe.eng.osaka-u.ac.jp\/naoe\/naoe2\/?page_id=18"},"modified":"2026-07-30T07:47:05","modified_gmt":"2026-07-29T22:47:05","slug":"research","status":"publish","type":"page","link":"https:\/\/www-naoe.eng.osaka-u.ac.jp\/naoe\/naoe2\/index.php\/research\/","title":{"rendered":"\u7814\u7a76"},"content":{"rendered":"\n

Research<\/p>\n\n\n\n

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Durability of structural and mechanical systems: fatigue, corrosion, and wear<\/strong><\/summary>\n

For floating offshore wind turbines, it is necessary to properly evaluate the integrity of mooring chains, which are exposed to wear and corrosion in seawater. A wear test of the mooring chain and a coupled analysis of the floating body and mooring chain are performed. In addition, in severe environments such as ballast tanks, which are exposed to dry and wet cycles, it is also important to predict corrosive damage, and we are conducting research on the coupled analysis of coating damage.<\/p>\n<\/details>\n\n\n\n

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Development of technologies for elucidating fatigue, corrosion, and wear mechanisms and for service\u2011life evaluation<\/strong><\/summary>\n

In order to properly evaluate the ship\u2019s structural integrity, it is necessary to model the time history of wave-induced loads encountered and to quantitatively evaluate the effect of fatigue strength improvement methods such as high-frequency mechanical impact (HFMI) treatment and partial heating on life extension. We perform not only the fatigue tests to verify it but also fracture mechanics analysis to clarify the mechanism of fracture phenomena after HFMI treatment.<\/p>\n\n\n\n

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\u30c7\u30fc\u30bf\u30b5\u30a4\u30a8\u30f3\u30b9\u306e\u7dad\u6301\u7ba1\u7406\u30fb\u751f\u7523\u5de5\u5b66\u3078\u306e\u5fdc\u7528<\/h2>\n\n\n\n

\u8239\u4f53\u306e\u69cb\u9020\u5fdc\u7b54\u306e\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3092\u884c\u3044\uff0c\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u308b\u30c7\u30fc\u30bf\u540c\u5316\u3092\u884c\u3046\u3053\u3068\u3067\uff0c\u9650\u3089\u308c\u305f\u8a08\u6e2c\u70b9\u306e\u60c5\u5831\u304b\u3089\u540c\u5316\u7b87\u6240\u306b\u304a\u3051\u308b\u69cb\u9020\u5fdc\u7b54\u3092\u63a8\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\uff0c\u3053\u308c\u306b\u3088\u308a\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306e\u5408\u7406\u5316\u3084\u904b\u822a\u652f\u63f4\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\uff08\u8239\u4f53\u69cb\u9020\u30c7\u30b8\u30bf\u30eb\u30c4\u30a4\u30f3<\/a>\uff09\uff0e\u305d\u306e\u4ed6\uff0c\u92fc\u677f\u306e\u30d7\u30e9\u30ba\u30de\u5207\u65ad\u97f3\u3092\u6a5f\u68b0\u5b66\u7fd2\u3057\uff0c\u9069\u5207\u306a\u4ea4\u63db\u671f\u9593\u3092AI\u304c\u5224\u65ad\u3059\u308b\u3053\u3068\u3067\uff0c\u9020\u8239\u5de5\u4f5c\u5168\u4f53\u306e\u751f\u7523\u6027\u306e\u5411\u4e0a\u304c\u671f\u5f85\u3067\u304d\u308b\uff0e<\/p>\n\n\n\n

Data\u2011science\u2013driven approaches to maintenance management and production engineering<\/strong><\/summary>\n

By monitoring the structural response of a ship’s hull and assimilating data through simulation, it is possible to estimate the structural response at assimilated points from a limited number of measurement points, which can be used to rationalize maintenance and support ship operations. In addition, the productivity of shipbuilding work can be improved by machine learning the sound of plasma cutting of steel plates and allowing the AI to determine the appropriate replacement period.<\/p>\n\n\n\n

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Digital transformation of quality inspection through fully automated visual inspection and defect detection<\/strong><\/summary>\n

Visual inspection of welded structures is a fundamental process for ensuring structural safety and reliability. Surface defects can become initiation sites for fatigue failure, significantly reducing service life and potentially leading to serious accidents if left unaddressed. Early detection through visual inspection enables inexpensive and localized repair, while also improving the accuracy of subsequent nondestructive testing such as UT, MT, and PT. Moreover, visual inspection serves as an essential indicator of welder skill and overall quality control. However, these inspection processes rely heavily on skilled human judgment and are labor\u2011intensive and costly. As a result, there is a growing demand for automated and labor\u2011saving inspection systems using Algorithm-based shape detection, AI\u2011based image analysis and robotic technologies to achieve stable quality assurance and more efficient maintenance throughout the lifecycle of welded structures.<\/p>\n<\/details>\n\n\n\n


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  4. \u5357\u6975\u89b3\u6e2c\u8239\u300c\u3057\u3089\u305b\u300d\u6027\u80fd\u8a55\u4fa1\u306e\u8a08\u6e2c\uff08\u5357\u6975\u6d77\u3067\u306e\u7815\u6c37\u6027\u80fd\u306e\u8a08\u6e2c\u3068\u89e3\u6790\uff09<\/li>\n<\/ol>\n\n\n\n
    Development of ships and offshore structures for ice\u2011covered seas<\/strong><\/summary>\n

    We are conducting a wide range of research on the development of ice-resistant structures for ships and offshore structures in the extremely special environments of ice seas, such as the Arctic Ocean and Antarctic Ocean.
    1. Measurements for performance evaluation of the Antarctic research vessel \u201cShirase\u201d (measurement and analysis of ice-breaking performance in the Antarctic Ocean)
    2. Numerical modeling of ice sea navigation (ice load estimation, ice sea navigation simulation, hull structure response calculation)
    3. Tank experiments on ice-resistant ships (measurement of ice loads and hull response)
    4. Estimation of sea ice strength (sea ice strength experiments, construction of sea ice structure models)<\/p>\n\n\n\n

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    \"\"<\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"

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