| Project/Area Number |
08650678
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | Kagoshima University |
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Principal Investigator |
MINAKAWA Youichi Kagoshima University, Faculty Eng., professor, 工学部, 教授 (30128459)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOMAI Mitsuo Kagoshima University, Research And Development Center associate professor, 地域共同研究センター, 助教授 (50171004)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | cylindrical shell / tank / out-of-roundness / subharmonic oscillation / shaking table / 水平振動 / 非線形振動 / out-of-round / だ円モード / 幾何学的非線形 / 非線形振動応答 / 高調波振動 / 高次振動モード |
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| Research Abstract |
Observing a cylindrical shell tank with water on a shaking table, we can find a lot of responses of which occurring mechanism is no known by linear vibration theory. For example, there are vibration components corresponding to 1/2-subharmonic and 1/3-subharmonic oscillation that happened to take place in some external frequency region and became extreme large vibrations. We have been studying the nonlinear vibrations in both theoretical and experimental aspects. In order to grasp global behavior of the nonlinear oscillations, we have to experiment with many vibration models with various water levels. Because nonlinear oscillations happen to take place at a specimen but never occur another.
Adopting response data of eight specimens, we clarified several requirements of instability regions of subharmonic oscillations. The instability regions might be in neighborhood of external frequency regions corresponding to two times large value of a frequency of a vibration mode that happens to occur there.
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