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滑り軸受に発生する自励振動オイルホワールの振動特性 Vibration characteristics of oil whirl in kind of self excited vibration generated in sliding bearing Ohta, Hiromitsu 2651 太田, 博光 80399641 オオタ, ヒロミツ Takada, Tomohiro 2178 高田, 寛大 タカダ, トモヒロ 福井, 良輔 2179 フクイ, リョウスケ Fukui, Ryousuke 長橋, 尚也 2180 ナガハシ, ナオヤ Nagahashi, Naoya 山田, 雄太 2181 ヤマダ, ユウタ Yamada, Yuta self-excited vibratio; oil whirl; sliding bearing; shaft unbalance; frequency response This paper shows the vibration characteristics of a sliding bearings. Especially, the self-excited vibration to be called as oil whirl generated in sliding bearing is studied in the current paper. Three methods like trajectory analysis, tracking analysis and frequency analysis of shaft vibration are analyzed to clarify the vibration characteristics of oil whirl. The oil whirl in a sliding bearing is a characteristic self-oscillation, which occurs at a rotation speed less than the twice of the critical speed of the experimental system. In addition, when oil whirl and shaft unbalance are simultaneously generated in a sliding bearing, the frequency response in all domains of frequency is suddenly become larger compared to that in the case of the only oil whirl. It seems that simultaneous development of oil whirl and shaft unbalance generate the large damage to the rotary machinery system. Furthermore, the amount of whirling to the shaft generated by the oil whirl are identified large in the horizontal, vertical and axial directions of sliding bearing. Particularly, the amount of whirling in the horizontal direction is identified larger, because, there is no suppression as gravity and structural barrier in this direction like that in the vertical and in the axial directions. 編集：水産大学校 departmental bulletin paper 水産研究・教育機構 Japan Fisheries Research and Education Agency 2021-12-15 VoR application/pdf 水産大学校研究報告 2 70 45 54 Journal of National Fisheries University AN00124678 0370-9361 https://fra.repo.nii.ac.jp/record/21/files/2022040104.pdf https://doi.org/10.57348/00000014 https://fra.repo.nii.ac.jp/records/21 jpn 2022040104 20230410048 fish-u:71-048 水産大学校研究報告 70 目次 https://www.fish-u.ac.jp/kenkyu/sangakukou/kenkyuhoukoku/70.html open access