2005 Fiscal Year Final Research Report Summary
Evaluation method of the life of ship structure using X ray CT scaned image base analysis
| Project/Area Number |
15360460
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SUZUKI Katsuyuki The University of Tokyo, Graduate School of Frontier Sciences, Associate Professor, 大学院新領域創成科学研究所, 助教授 (10235939)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Image Base Analysis / Mesh Superposition Analysis / Finite Cover Method |
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| Research Abstract |
The iterative solver for finite cover method is investigated. Usual iterative solver such as PCG does not converge when the displacement boundary condition is applied within an element, hence multi point constraint are imposed. To solve this difficulty, the conjugate projected gradient method is employed, and compared with the results of traditional preconditioned conjugate gradient method and augumented Lagrangian method.
Also, Finite Cover Method (FCM) and the mesh superposition method are unified. In this process, the global mesh, which represents the behavior of the whole model is composed of voxel type elements, while the local mesh, which represents the behavior around the model boundaries is composed of ordinary finite elements. The accuracy of analysis around the boundaries can be improved. Several numerical examples show the performance of the presented technique.
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