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Analysis of system reliability based on weakest t-norm arithmetic operations using Pythagorean fuzzy numbers

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Abstract

The present study incorporates the weakest t-norm (Tw) based approximate Pythagorean fuzzy arithmetic operations on different types of Pythagorean fuzzy numbers to investigate the fuzzy reliability of a weapon system. In many real-world problems, sometimes due to the absence of adequate failure data of system components, the assessment of the precise probability of failure of system components may not be an easy task. Therefore, the failure data of system components can be assumed in fuzzy form. This study extends the concept of an intuitionistic fuzzy set into a Pythagorean fuzzy set, utilizing a novel approach to address the system failure probability with quantitative failure data of system components using fault tree analysis. In complex systems, interval arithmetic operations on fuzzy numbers may lead to an increasing tendency of fuzziness. To decrease the fuzzy spread up to a desired degree of accuracy during the complicated calculations of complex systems under an imprecise environment, approximate Pythagorean fuzzy arithmetic operations are developed based on the weakest t-norm methodology. Further, the fuzzy reliability of series and parallel systems is constructed using the aforesaid approach. The proposed study has been applied to a fault in a weapon system as an illustration.

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Abbreviations

\({T}_{w}\) :

Weakest \(t\)-norm

\(\widetilde{P}\) :

Pythagorean fuzzy set

\({\omega }_{\widetilde{P}}/ {\xi }_{\widetilde{P}}\) :

Membership/non-membership functions of Pythagorean fuzzy set \(\widetilde{P}\)

\({\widetilde{R}}_{S}^{(\alpha )}\) :

α-cut corresponding to the membership for fuzzy reliability of the series system

\({}^{(\alpha )}{\widetilde{R}}_{S}\) :

α-cut corresponding to non-membership for fuzzy reliability of the series system

\({\widetilde{R}}_{P}^{(\alpha )}\) :

α-cut corresponding to the membership for fuzzy reliability of the parallel system

\({}^{(\alpha )}{\widetilde{R}}_{P}\) :

α-cut corresponding to non-membership for fuzzy reliability of the parallel system

\(r_{iL}^{(\alpha)}/r_{iU}^{(\alpha)}\) :

Lower/upper bound corresponding to membership function of fuzzy reliability

\({{}^{\left(\alpha \right)}r}_{iL }/{{}{}^{(\alpha )}r}_{iU }\) :

Lower/upper bound corresponding to non-membership function of fuzzy reliability

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Acknowledgements

This research work is supported by Grants from the Council of Scientific & Industrial Research (CSIR), India, to Mintu Kumar via Senior Research Fellowships (SRF).

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Kumar, M., Singh, S.B. Analysis of system reliability based on weakest t-norm arithmetic operations using Pythagorean fuzzy numbers. Int J Syst Assur Eng Manag 15, 1467–1482 (2024). https://doi.org/10.1007/s13198-023-01906-3

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