Linear Systems with Large Uncertainties, with Applications to Truss Structures

13 years 4 months ago

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Linear systems whose coeﬃcients have large uncertainties arise routinely in ﬁnite element calculations for structures with uncertain geometry, material properties, or loads. However, a true worst case analysis of the inﬂuence of such uncertainties was previously possible only for very small systems and uncertainties, or in special cases where the coeﬃcients do not exhibit dependence. This paper presents a method for computing rigorous bounds on the solution of such systems, with a computable overestimation factor that is frequently quite small. The merits of the new approach are demonstrated by computing realistic bounds for some large, uncertain truss structures, some leading to linear systems with over 5000 variables and over 10000 interval parameters, with excellent bounds for up to about 10% input uncertainty. Also discussed are some counterexamples for the performance of traditional approximate methods for worst case uncertainty analysis. 1

Arnold Neumaier, Andrzej Pownuk

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