2010 Fiscal Year Final Research Report
Study on Ultra-High-Stability of Herringbone-Grooved Aerodynamic Journal Bearings with Nonlinear Viscoelastic Elements
| Project/Area Number |
21860076
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Waseda University |
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Principal Investigator |
MIYANAGA Norifumi Waseda University, 理工学術院, 助手 (00547060)
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| Project Period (FY) |
2009 – 2010
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| Keywords | 非線形粘弾性 / 同定 / ヘリングボーン軸受 / 気体軸受 / 超高速 / 安定性 / 自励振動 / ホワール |
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| Research Abstract |
This study optimized the viscoelastic elements supporting a bearing and proposed the herringbone-grooved aerodynamic journal bearing that can support a rotating shaft without whirl instability even at ultra-high-speed rotational region. In this study, O-rings were used as the viscoelastic elements. This study, first of all, identified the stiffness and the damping coefficients of O-rings under bearing supporting for different materials, temperatures and deformation ratios. Next, the results were formulated by the empirical formula and their nonlinearities were mathematically evaluated. Subsequently, the stability threshold of the bearing system is predicted using the empirical formula and compared with the experimental results. Finally, the design guilds for increasing the stability threshold of the bearing system were clarified by reference to the empirical formula.
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