A Hyper-Ellipsoid Approach for Inverse Lack-of-Knowledge Uncertainty Quantification

This paper presents a novel methodology to solve an inverse uncertainty quantification problem where only the variation of the system response is provided by a small set of experimental data. Furthermore, the method is extended for cases where the uncertainty of the response quantities is given by an incomplete set of statistical moments. For both cases, the uncertainty on the output space is represented by a minimum volume enclosing ellipsoid (MVEE). The actual inverse uncertainty quantification is conducted by identifying also a hyper-ellipsoid for the input parameters, which has an image on the output space that matches the MVEE as close as possible. Hence, the newly introduced approach is a contribution to the field of nonprobabilistic uncertainty quantification methods. Compared to literature, the new approach has often superior accuracy and especially an improved efficiency for high-dimensional problems. The method is validated first by an analytical test case and subsequently applied to a jet engine performance model, where this type of inverse uncertainty quantification has to be solved to allow for a consistent and integrated solution procedure. In both cases, the results are compared with an inverse method where the variability on the input side is quantified by a multidimensional interval. It can be shown that the hyper-ellipsoid approach is superior with respect to the computation time in high-dimensional problems encountered not only in jet engine design.

[1]  M. Hanss,et al.  Review: Non-probabilistic finite element analysis for parametric uncertainty treatment in applied mechanics: Recent advances , 2011 .

[2]  David P. Dobkin,et al.  The quickhull algorithm for convex hulls , 1996, TOMS.

[3]  Matthias G. R. Faes,et al.  Identification and quantification of multivariate interval uncertainty in finite element models , 2017 .

[4]  Fabian Duddeck,et al.  A decoupled design approach for complex systems under lack-of-knowledge uncertainty , 2020, Int. J. Approx. Reason..

[5]  A. Kiureghian,et al.  Aleatory or epistemic? Does it matter? , 2009 .

[6]  Michael Hanss,et al.  Model Assessment Using Inverse Fuzzy Arithmetic , 2010, IPMU.

[7]  Edoardo Patelli,et al.  A multivariate interval approach for inverse uncertainty quantification with limited experimental data , 2019, Mechanical Systems and Signal Processing.

[8]  Fabian Duddeck,et al.  Maximizing Flexibility for Complex Systems Design to Compensate Lack-of-Knowledge Uncertainty , 2019 .

[9]  David Moens,et al.  Recent Trends in the Modeling and Quantification of Non-probabilistic Uncertainty , 2019, Archives of Computational Methods in Engineering.

[10]  Edoardo Patelli,et al.  Inverse quantification of epistemic uncertainty under scarce data: Bayesian or Interval approach? , 2019 .

[11]  Xinjia Chen,et al.  A New Generalization of Chebyshev Inequality for Random Vectors , 2007, ArXiv.

[12]  I. Elishakoff,et al.  Uncertainty quantification based on pillars of experiment, theory, and computation. Part II: Theory and computation , 2016 .

[13]  J. Beck,et al.  Updating Models and Their Uncertainties. I: Bayesian Statistical Framework , 1998 .

[14]  Leonid Khachiyan,et al.  Rounding of Polytopes in the Real Number Model of Computation , 1996, Math. Oper. Res..

[15]  Robert L. Mullen,et al.  Interval-Based Approach for Uncertainty Propagation in Inverse Problems , 2015 .