Two-level approximation method for reliability-based design optimisation

Hae Chang Gea, Kunjal Oza

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


In order to model uncertainties and achieve the required reliability, Reliability-Based Design Optimisation (RBDO) has evolved as a dominant design tool. Many methods have been introduced to solve the RBDO problem. However, the computational expense associated with the probabilistic constraint evaluation still limits the applicability of the RBDO to practical engineering problems. In this paper, a Two-Level Approximation method (TLA) is proposed. At the first level, a reduced second order approximation is used for better optimisation solution; at the second level a linear approximation is used for faster reliability assessment. The optimal solution is obtained iteratively. The proposed method is tested on certain numerical examples, and results obtained are compared to evaluate the cost-effectiveness.

Original languageEnglish (US)
Pages (from-to)99-111
Number of pages13
JournalInternational Journal of Materials and Product Technology
Issue number1-3
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


  • Design with uncertainty
  • Reliability-based design optimisation


Dive into the research topics of 'Two-level approximation method for reliability-based design optimisation'. Together they form a unique fingerprint.

Cite this