1、Lessons Learned Entry: 0340Lesson Info:a71 Lesson Number: 0340a71 Lesson Date: 1994-08-03a71 Submitting Organization: MSFCa71 Submitted by: Billy ColeSubject: Subsynchronous Whirl Rotor-Dynamics Description of Driving Event: A characteristic of rotor machinery has been subsynchronous whirl rotor-dyn
2、amics, most recently experienced on the SSME. This motion takes the form of whirling or whipping of the flexed rotor at one of the rotors natural frequencies below the running speed. Both the HPFTP and the HPOTP experience this problem, and a higher performance requirement on these pumps resulted in
3、 marginal whirl situations.Lesson(s) Learned: Small differences in manufacturing (within specification) produce some pumps with whirl.Recommendation(s): The concept and development of hydro-dynamic damping seals were the innovative solutions to inhibiting whirl.Evidence of Recurrence Control Effecti
4、veness: Subsynchronous whirl dynamic vibration now measured 50% less in the HPFTP and 90% less in the HPOTP.Documents Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Mission Directorate(s): N/AAdditional Key Phrase(s): a71 HardwareAdditional Info: Approval Info: a71 Approval Date: 1994-08-17a71 Approval Name: Steve Androlakea71 Approval Organization: QSa71 Approval Phone Number: 202-358-4738Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
