| Project/Area Number |
17K06128
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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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 | Kanto Gakuin University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
富岡 淳 早稲田大学, 理工学術院, 教授 (40217526)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 気体軸受 / Hopf 分岐 / Hopf分岐 / ジャーナル軸受 / ホップ分岐 / 自励振動 / 安定性 / 超高速回転 / 気体潤滑ジャーナル軸受 / ホワール / 安定解析 / トライボロジー |
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| Outline of Final Research Achievements |
In this study, Hopf bifurcation analysis of gas lubricated journal bearings was applied to the stability analysis problem. In addition, the stability analysis was carried out by obtaining the kind of bifurcation and the periodic solution near the stability limit and capturing the non-linearity of the oil film. As a result, in the region called subcritical bifurcation, the amplitude increased sharply as soon as the vibration amplitude became larger than the periodic solution even before the stability limit was reached. On the other hand, in the region called supercritical bifurcation, there was a phenomenon that the amplitude gradually increased along the periodic solution even above the stable critical velocity. These results were confirmed by experiments.
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| Academic Significance and Societal Importance of the Research Achievements |
回転機械の回転軸を支持するジャーナル軸受は、回転数が大きくなると装置の破壊に至るほどの大きな振動を引き起こす。これを避けるような軸受設計法を確立するために、Hopf分岐と呼ばれる現象に注目した軸受解析および軸受試験を行い、その特徴を明らかにした。本研究により、より安全性の高い軸受設計法につながると考えられる。
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