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Derating Design for Improving System Reliability by Using a Probabilistic Approach

시스템 신뢰성 향상을 위한 확률적 부하경감설계

  • Son, Young-Kap (Dept. of Mechanical & Automotive Engineering, Andong Nat'l Univ.)
  • 손영갑 (안동대학교 기계자동차공학과)
  • Received : 2010.01.05
  • Accepted : 2010.04.22
  • Published : 2010.06.01

Abstract

This paper proposes a derating design method for improving system reliability by using a probabilistic approach. In the proposed design, the focus is upon system levels in determining derated levels of stresses such as temperature and current, unlike recent design approaches that focus on component levels. System reliability is evaluated using component reliability metrics that are given as functions of time and unknown stresses; this evaluation is based on a series system-reliability model. The variation in stress, which was not considered in previous derating designs, is introduced in the present design to account for the uncertainty in both environmental and operating conditions at the customer' hands. Optimization problems for system reliability improvement are formulated and solved using FORM to determine the best derating design. An example of a derating design for an electrical system shows the details of the proposed method and its applicability to systems design for reliability improvement.

Keywords

Derating Design;Probabilistic;System Level;Variation in Stress

Acknowledgement

Supported by : 안동대학교

References

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Cited by

  1. Robust Design of a Dynamic System Using a Probabilistic Design Method vol.35, pp.10, 2011, https://doi.org/10.3795/KSME-A.2011.35.10.1171