@techreport{oai:jaxa.repo.nii.ac.jp:00044741,
 author = {宮地, 敏雄 and 星谷, 昌二 and 祖父江, 靖 and MIYACHI, Toshio and HOSHIYA, Shoji and SOFUE, Yasushi},
 month = {Feb},
 note = {The previous report(ref.2), confirmed that the unbalance vibration of single spool turbo-jet engines and vibration damping effect of the squeeze film damper bearing could be estimated with sufficient accuracy for design purposes, by theoretical analysis. Following these results, calculations on unbalance vibration in 2 typical models of 2 spool fan-jet engine were made, with consideration given to the different rotor speeds. The results of the analysis showed that- (1)Medium to large size 2 spool fan-jet engines have many resonance frequencies in the speed ranges, and at some speeds and positions, the vibration amplitudes exceed the critical value, without a damper bearings. (2)In most cases, however, the vibration amplitude at the critical speed can be suppressed to within a safe value, using one or two damper bearing(s) at some adequate position(s)., 資料番号: NALTR0488000, レポート番号: NAL TR-488},
 title = {ロータの不つりあいによって生ずるジェットエンジンの振動の研究 第2報 典型的な2軸ファンジェットエンジンに関する解析},
 year = {1977}
}