Efficient exceedance probability computation for randomly uncertain nonlinear structures with periodic loading

Gong, Guanghua; Dunne, John F.

doi:10.1016/j.jsv.2010.11.020

Cited by 5 publications

(1 citation statement)

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“…Uncertainty can arise from variability in materials, manufacture, and assembly, and can be modelled deterministically [1][2][3], in a fuzzy sense [4][5], or statistically [6][7][8][9][10][11][12][13]. Focusing on statistical bound prediction, complexity depends on the defined frequency range, whether low, mid, or high frequency.…”

Section: Introductionmentioning

confidence: 99%

Accurate extreme-value-based frequency response bounding for structures with a small number of highly random parameters

Dunne

Cheepsomsong

2016

Journal of Sound and Vibration

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A modified extreme-value-based methodology is discussed for computing statistical bounds associated with the magnitude of the frequency response of a specified number of structures with high levels of random parameter uncertainty. The methodology, intended for small numbers of uncertain parameters, is capable of constructing accurate statistical bounds in terms of quantiles associated with the extreme value distribution. Quantiles can be constructed for an ensemble of structural responses across the entire frequency range without using Monte Carlo Simulation. To test the methodology, statistical bounds for the energy of an L-shaped structure with low and high levels of uniformly-distributed length and thickness variability are obtained: i) via direct integration using an ANSYS Finite Element model, and ii) via Statistical Energy Analysis (SEA). Comparisons are shown with bounds obtained using Monte Carlo simulation. The merit of direct integration for computing bounds associated with the responses of an ensemble of structures with high levels of random parameter uncertainty is demonstrated by its simplicity, high accuracy, and absence of statistical scatter.Keywords: ensemble analytical response bounds random parameters 11 main-section pages (double-spaced) 32 references Figures 1 -9 1 appendix 3

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