Effective procedures are presented for the response analysis of the Space Shuttle Main Engine (SSME) under transient loading conditions. Of particular concern is the determination of the nonlinear response of the systems to rotor imbalance in the presence of bearing clearances. The proposed methods take advantage of the nonlinearities involved being localized at only few rotor/housing coupling points. The methods include those based on alternative integral formulations for the incremental solutions involving the transition matrices of the rotor and housing. Alternatively, a convolutional representation of the housing displacements at the coupling points can be utilized to an advantage. For purposes of assessing the numerical integration results for the nonlinear rotor/housing systems, an FFT-based harmonic balance procedure is being developed to enable determining all possible harmonic, subharmonic, and nonperiodic solutions of the systems. A brief account of the Fourier approach is presented.
Efficient Transient Analysis Methods for the Space Shuttle Main Engine (SSME) Turbopumps
1986
21 pages
Report
Keine Angabe
Englisch
Rocket Engines & Motors , Structural Mechanics , Quality Control & Reliability , Balancing , Mathematical models , Performance prediction , Rotor aerodynamics , Rotors , Space shuttle main engine , Transient loads , Turbine pumps , Bearings , Fast fourier transformations , Harmonics , Nonlinearity , Numerical integration , Transient response
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