导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (3): 881-888.doi: 10.7527/S1000-6893.2014.0258

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

A decoupling method of reliability optimization based on sensitivity

ZHU Haiyan, YUAN Xiukai   

  1. Department of Aeronautics, Xiamen University, Xiamen 361005, China
  • Received:2014-04-23 Revised:2014-09-15 Online:2015-03-15 Published:2015-03-31
  • Supported by:

    National Natural Science Foundation of China (51105309)

Abstract:

A decoupling method based on reliability sensitivity is proposed for the reliability-based optimization (RBO) design of aeronautic structure. It utilizes reliability sensitivity to construct the explicit approximation of the failure probability function (FPF) with respect to design variables quickly, thus its advantage is that it only needs one reliability analysis and repeated reliability analyses can be avoided. After the approximation of the FPF is established, the target RBO problem can be transformed into a deterministic one which can be solved by conventional optimization strategies. Meanwhile, a sequential approximate optimization framework is adopted to guarantee the accuracy of the solution. Examples of composite beam and three-box simulated flap structure are given to demonstrate the feasibility and validity of the proposed optimization method.

Key words: reliability-based optimization, failure probability function, sensitivity, decoupling, importance sampling

CLC Number: