In many situations, it is either impossible to perform a spacecraft system level vibration test, or it is highly desirable to avoid one to conserve time and resources. If modeling and analysis are to replace system tests, it is imperative to have confidence in the results. Therefore, a probabilistic system correlation analysis must be performed by quantifying uncertainty in the substructures, and then propagating it into the system correlation metrics. A systematic procedure is presented for studying the effects of substructure uncertainty on system test-analysis correlation of spacecraft that are validated on a substructure-by-substructure basis. Covariance propagation is used to propagate uncertainty in a free-interface substructure frequency response into the expected frequency response uncertainty for the system using a component mode synthesis approach. The frequency response-based procedure is of special interest in systems with high-modal density, where modal correlation methods do not work. A simple two-substructure example is investigated, and the results of the proposed procedure are substantiated using a full system Monte Carlo analysis. The approach presented is very fast, compared with the Monte Carlo techniques, and it propagates uncertainty in the substructure frequency response directly into the system results.
Propagation of Uncertainty in Substructured Spacecraft Using Frequency Response
AIAA Journal ; 51 , 2 ; 353-361
2012-11-27
9 pages
Article (Journal)
Electronic Resource
English
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