A review is presented of various rotordynamic problems which have been encountered and eliminated in developing the current flight engines and of continuing subsynchronous problems which are being encountered in developing a 109 percent power level engine. The basic model for the HPOTP, including the structural dynamic model for the rotor and housing and component models for the liquid and gas seals, turbine-clearance excitation forces, and impeller-diffuser forces, are discussed. Results from a linear model are used to examine the synchronous response and stability characteristics of the HPOTP, examining bearing load and stability problems associated with the second critical speed. Various seal modifications are examined and shown to have favorable consequences with respect to bearing reactions and stability. Differences between linear and nonlinear model results are discussed and explained in terms of simple models. The transient nonlinear model is used to demonstrate forced subsynchronous motion similar to that observed in test data for models which are lightly damped but stable. The subsynchronous motion results from bearing clearance nonlinearities. Simulation results indicates that synchronous bearing loads can be reduced but that sub-synchronous motion is not eliminated by seal modifications.
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January 1985
Research Papers
Vibration Characteristics of the HPOTP (High-Pressure Oxygen Turbopump) of the SSME (Space Shuttle Main Engine)
D. W. Childs,
D. W. Childs
Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843
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D. S. Moyer
D. S. Moyer
Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843
Search for other works by this author on:
D. W. Childs
Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843
D. S. Moyer
Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843
J. Eng. Gas Turbines Power. Jan 1985, 107(1): 152-159 (8 pages)
Published Online: January 1, 1985
Article history
Received:
December 19, 1983
Online:
October 15, 2009
Citation
Childs, D. W., and Moyer, D. S. (January 1, 1985). "Vibration Characteristics of the HPOTP (High-Pressure Oxygen Turbopump) of the SSME (Space Shuttle Main Engine)." ASME. J. Eng. Gas Turbines Power. January 1985; 107(1): 152–159. https://doi.org/10.1115/1.3239676
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