Probabilistic Structural Response of a Turbopump Blade to Random Pulse Loading

by Michael C. Shiao, Sverdrup Technology, United States,
Robert Rubinstein, Sverdrup Technology, United States,
Christos C. Chamis, Sverdrup Technology, United States,

Document Type: Proceeding Paper

Part of: Probabilistic Methods in Civil Engineering


The objective of this work is to develop probabilistic models of the response of a Space Shuttle Main Engine (SSME) turbopump blade to random impact loading. These loads are caused by debris injection, which is modeled as a generalized Poisson process: debris arrival is modeled as an ordinary Poisson process, but the impact location and intensity are additional independent random variables. If the deterministic response to a unit impulse at any blade location is known, the blade structural response to the random loading can be modeled as a generalized pulse train. Subsequently, the cumulative distribution function of response at a desired point is computed for this process. The joint probability density function of the response and its derivative is also computed for application to the prediction of level crossing rates.

Subject Headings: Probability | Impact loads | Structural response | Dynamic structural analysis | Dynamic loads | Structural models | Pumps

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