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Decoupled approach to Multidisciplinary system analysis and Design under epistemic uncertainty

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dc.contributor.advisor Zaman, Dr. AKM Kais Bin
dc.contributor.author Kibria, Md. Gulam
dc.date.accessioned 2019-03-06T06:20:08Z
dc.date.available 2019-03-06T06:20:08Z
dc.date.issued 2018-07-02
dc.identifier.uri http://lib.buet.ac.bd:8080/xmlui/handle/123456789/5131
dc.description.abstract An efficient probabilistic approach is developed for uncertainty propagation in multidisciplinary system analysis under epistemic uncertainty. A decoupled approach is used in this thesis to un-nest the multidisciplinary system analysis from the probabilistic analysis to achieve better computational efficiency. This study proposes a moment matching based approach to estimate the first four moments of the coupling variables (variables that couple two or more sub-systems/ disciplines). The estimated first four moments are used as the uncertainty descriptors of the coupling variables. The probability density functions of the coupling variables are determined using the estimated first four moments. The proposed moment matching approach uses Taylor series expansion, tensor product quadrature, and univariate dimension reduction methods to estimate the moments of the coupling variables. Once the uncertainty in the coupling variables is quantified, the system level uncertainty propagation analysis is similar to single discipline problems which is available in the literature. The proposed methods are equally applicable to both sampling and analytical approximation-based reliability analysis methods. The proposed approach does not require any repeated sampling by Monte Carlo simulation, and yet can generate results similar to a sampling-based approach by Monte Carlo simulation; thus relieves us of the time consuming computationally prohibitive nature of Monte Carlo simulation. A mathematical problem and a real-life engineering problem are used to illustrate the proposed methods. The accuracy of the proposed decoupled approach is also verified by Monte Carlo simulation. en_US
dc.language.iso en en_US
dc.publisher Department of Industrial and Production Engineering en_US
dc.subject Automatic control en_US
dc.title Decoupled approach to Multidisciplinary system analysis and Design under epistemic uncertainty en_US
dc.type Thesis-MSc en_US
dc.contributor.id 1015082008 en_US
dc.identifier.accessionNumber 116821
dc.contributor.callno 629.8/GUL/2018 en_US


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