Random-fuzzy safety analysis for an aero engine turbine disk

Z. Z. Lu, C. L. Liu, Y. L. Xu, Z. F. Yue

Research output: Contribution to journalArticlepeer-review

Abstract

A numerical simulation method is presented for the random-fuzzy safety analysis of an aero engine disk. Based on the equivalent transformation from a fuzzy variable to a random variable, the equivalent random Probability Density Functions (PDFs) are got from their corresponding Fuzzy Possibility Distributions (FPDs) for the fuzzy variables. In that case the perfect numerical simulation method for the random uncertainty is employed to solve the fuzzy uncertainty. For the complex structure such as the aero engine disk with implicit relationship between the input basic variable and the response variable, the equivalent PDFs of the input basic variables are delivered simultaneously to the response variable by an empirical PDF, which is simulated by Finite Element Method(FEM). Then, in view of the fuzzy application requirement occurring in engineering usually, the reliability definition and calculation are discussed for the aero engine disk with multiple fuzzy failure modes. On the other hand, through the inverse transformation of the fuzzy variable to the random variable, the FPDs of the response variables can be calculated from their empirical PDFs as well.

Original languageEnglish
Pages (from-to)509-513
Number of pages5
JournalActa Metallurgica Sinica (English Letters)
Volume17
Issue number4
StatePublished - Aug 2004

Keywords

  • Fuzzy
  • Random
  • Reliability
  • Turbine disk

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