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An improved analytical solution to outcrossing rate for scalar nonstationary and non-gaussian processes

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  • Zhang, Bohua
  • Wang, Weigang
  • Lei, Haoran
  • Hu, Xiancun
  • Li, Chun-Qing

Abstract

For time-dependent reliability methods, there is a lack of analytical solutions to outcrossing rates of nonstationary and non-Gaussian processes. This paper aims to propose an analytical method to determine this type of outcrossing rate with improved accuracy and efficiency. The novelty of this proposed method is that it can consider the probabilistic properties of non-Gaussian processes by combining a two-component parallel system model with higher-order moments-based reliability indexes. The main contributions of this method are: (1) compared with PHI2+ method, it is more accurate for the calculation of the outcrossing rate of nonstationary and non-Gaussian processes with nonlinear limit state functions; (2) compared with MPHI2 method, it is analytical and not only applicable for the nonstationary stochastic processes but also insensitive to time increments; and (3) it is not only more accurate than the existing methods for nonstationary and non-Gaussian processes but also more computation efficient than the Monte Carlo simulation method. The proposed method has shown its advantages for practical structures with neither Gaussian processes nor linear limit state functions, which are beneficial for both researchers and asset managers to evaluate the time-dependent reliability of structures accurately and to develop risk-informed maintenance schemes with a view to prolonging their service life.

Suggested Citation

  • Zhang, Bohua & Wang, Weigang & Lei, Haoran & Hu, Xiancun & Li, Chun-Qing, 2024. "An improved analytical solution to outcrossing rate for scalar nonstationary and non-gaussian processes," Reliability Engineering and System Safety, Elsevier, vol. 247(C).
    • Handle: RePEc:eee:reensy:v:247:y:2024:i:c:s0951832024001765
    DOI: 10.1016/j.ress.2024.110102
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    References listed on IDEAS

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