Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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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
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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.

본 논문은 시스템 신뢰성 향상을 위한 확률적 접근을 이용한 부하경감설계방법을 제안한다. 제안하는 설계방법은 부품 수준이 아닌 시스템 수준에서 온도와 전류와 같은 스트레스의 경감 수준을 선정하는 것이다. 직렬 시스템의 신뢰도 모델을 이용하여, 스트레스와 시간의 함수로 주어진 부품들의 신뢰도값들을 이용하여 시스템 신뢰도를 평가한다. 기존의 부하경감설계에서는 고려되지 않았지만, 본 연구에서는 환경 및 동작 조건에서 시스템이 받게 되는 스트레스의 변량을 고려하였다. 시스템 신뢰도 향상을 위한 최적화 문제를 정의하고, FORM을 적용하여 해를 구함으로써 최적의 부하경감설계를 수행하였다. 전기 시스템에 대한 설계를 통하여 제안한 설계방법에 대한 자세한 설명과 응용가능성을 제시하였다.

Keywords

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