@techreport{oai:jaxa.repo.nii.ac.jp:00002511,
 author = {弘松, 純 and 内海, 政春 and 高田, 仁志 and 長尾, 直樹 and 江口, 真人 and 井上, 秀行 and Hiromatsu, Jun and Uchiumi, Masaharu and Takada, Satoshi and Nagao, Naoki and Eguchi, Masato and Inoue, Hideyuki},
 month = {Oct},
 note = {A floating ring seal (FRS) has been employed as a noncontact type seal, which seals in high-pressure liquid oxygen for the rocket engine turbopump. The turbopump, high-speed, high-power turbomachinery, has suffered from rotor vibration problems up to the present time. However, as the dynamic behavior of FRS has rarely been focused on, it is necessary to clarify the rotordynamic (RD) fluid forces of FRS. The objectives of the present study were to evaluate the RD fluid forces of FRS analytically (bulk-flow model) and experimentally, and to elucidate the structural behavior of FRS caused by the whirling motion of the rotor. Evaluation of RD fluid forces was attempted, and development of a program for evaluation of the FRS is now in progress. RD fluid forces of FRS were measured by an experimental apparatus with an active magnetic bearing. These forces had no significant impact on rotordynamic stability. The axial force induced by differential pressure presses the floating-ring (FR, the component of the FRS) against the stationary housing. Because of the increasing friction force of the secondary contact surface, high axial loads increase the radial force required to reposition the FR. Therefore, it is very important to investigate rotordynamic forces as tribological behavior., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA0062043000, レポート番号: JAXA-RM-13-008E},
 title = {Rotordynamic Fluid Forces of Floating Ring Seal for Rocket Turbopump},
 year = {2013}
}