| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Outline of Final Research Achievements |
In this study, we investigated a hopf bifurcation phenomena of journal bearings and applied it to their stability analysis. Further more, we obtained types and periodic solutions of the bifurcations occured in the bearings, performed the stability analysis with the nonlinearlity of the fluid film. As a result, in a subcritical bifurcation region, the vibration amplitude of the shaft immidiately increased even lower speed of stability limit. On the other hand, in a supercritical bifurcation region, the vibration amplitude of the shaft increased with the periodic solution even higher speed of stability limit.
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