| Project/Area Number |
15360080
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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 |
Design engineering/Machine functional elements/Tribology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SUZUKI Hiromasa The University of Tokyo, Research Center for Advanced Science & Technology, Professor, 先端科学技術研究センター, 教授 (40187761)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥15,200,000 (Direct Cost: ¥15,200,000)
Fiscal Year 2004: ¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 2003: ¥9,600,000 (Direct Cost: ¥9,600,000)
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| Keywords | Iso-surfacing / X-ray CT scanning / triangular mesh / non-manifold / CAD |
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| Research Abstract |
In this research project, modeling methods to be used in advanced digital engineering systems based on X-ray CT scanner are investigated. Our particular interest is in generation of triangular meshes or other forms of surface information from CT data, which can be used in the digital engineering systems. One standard methods for this mesh generation is so-called "iso-contouring" method. In the first year of this 2 year project, we developed a method to generate boundary surfaces between different material parts simultaneously. It can be applied to such a mechanical part as automotive engine blocks which are made of iron and aluminum. This method is based on three dimensional image analysis for material segmentation and also on our innovative contouring method based on our "Matching Cubeablity" theory.
In the second year, we were concentrated on modeling technologies for thin plate structures. Particularly we studied methods for extracting medial surface from CT data. A medial surface is
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useful for designers to design thin plate structures. So there is large demand to extract them from CT images. Our method is hybrid by combining volumetric modeling and mesh modeling. We first extract voxels which are related to the medial surface. Then we apply our contouring algorithm to generate a triangle mesh for the medial surface. Since we can also extract the boundary surface of the thin plate structure, thickness distribution of the thin plate can be evaluated. In our industrial applications, accuracy is rather important. We design and manufacture specific samples (phantom) to examine the accuracy of our medial surface. Our experiment shows that the accuracy of the medial surface is as good as that of the boundary surface.
Furthermore we are working on the problem of welded parts. A thin plate structures are usually made of several pieces of thin plate which are welded together. Using X-ray CT, it is impossible to identify such welded part from the images. However, in digital engineering applications, meshes for each individual part before welding and information about the welding positions are important. So we studied a method to separate CT data of a complex welded assembly into its parts. Though there are still difficult problems, we have succeeded for typical welded parts. Less
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