618 四角穴テクスチャを有するジャーナル軸受の動特性に関する数値解析 : すきま不連続部に生じる慣性効果およびエネルギー損失の影響

• 山田 博之

  長岡技術科学大学大学院エネルギー・環境工学専攻

• 田浦 裕生

  長岡技術科学大学大学院

• 金子 覚

  長岡技術科学大学大学院

書誌事項

タイトル別名

• 618 Numerical analysis on the Dynamic Characteristics of Textured Journal Bearings with Square-Dimple Pattern : Effects of the Inertia Effect and Energy Loss Caused by Film Discontinuous on the Dynamic Characteristics of Journal Bearings

抄録

Dynamic characteristics of journal bearings with uniform square dimples on the whole bearing inner surface are numerically calculated taking into account the inertia effect and the energy loss based on the oil film discontinuity at the edge of dimples. The comparison of the results with a smooth surface bearing without dimples shows that in terms of the equilibrium position of textured bearings the eccentricity ratio is larger and the attitude angle is smaller than those of a smooth bearing. In particular, the effect of energy loss is more effective to the equilibrium position than inertia effect. In respect of the dynamic coefficients of oil film, for large Sommerfeld number region the cross-coupled stiffness and the direct damping coefficients decrease by texturing due to the increase of mean clearance. The energy loss at the edge of dimples changes the whole dynamic coefficients significantly because the energy loss affects the velocity field of fluid which determines the pressure distribution of oil film. The linear stability threshold shaft speed of a symmetrical rigid rotor becomes higher when the energy loss at dimple edges is considered, which is attributable to the reduction of the cross-coupled stiffness coefficients and the increase of the direct damping coefficient. For the analysis of characteristics of textured journal bearing with larger dimple number, the energy loss at the dimple edges is more important than the inertia effect owing to the increase of dimple edge parts which lead to larger energy loss.

収録刊行物

• 機械力学・計測制御講演論文集

  機械力学・計測制御講演論文集 2015 "618-1"-"618-10", 2015-08-25

  一般社団法人日本機械学会

キーワード

• Journal Bearing
• Hydrodynamic Bearing
• Texturing
• Square Dimples
• Dynamic Characteristics
• Stability

詳細情報

• CRID: 1572543027367634432
• NII論文ID: 110010054297
• NII書誌ID: AA11901770
• ISSN: 13480235
• 本文言語コード: ja
• データソース種別:
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