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

The Korean Society of Mechanical Engineers (대한기계학회)
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Reliability Evaluation of Concentric Butterfly Valve Using Statistical Hypothesis Test

통계적 가설검정을 이용한 중심형 버터플라이 밸브의 신뢰성 평가

  • Chang, Mu-Seong (Reliability Assessment Center, Korea Institute of Machinery and Materials) ;
  • Choi, Jong-Sik (Reliability Assessment Center, Korea Institute of Machinery and Materials) ;
  • Choi, Byung-Oh (Reliability Assessment Center, Korea Institute of Machinery and Materials) ;
  • Kim, Do-Sik (Reliability Assessment Center, Korea Institute of Machinery and Materials)
  • 장무성 (한국기계연구원 신뢰성평가센터) ;
  • 최종식 (한국기계연구원 신뢰성평가센터) ;
  • 최병오 (한국기계연구원 신뢰성평가센터) ;
  • 김도식 (한국기계연구원 신뢰성평가센터)
  • Received : 2015.07.24
  • Accepted : 2015.10.29
  • Published : 2015.12.01
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Abstract

A butterfly valve is a type of flow-control device typically used to regulate a fluid flow. This paper presents an estimation of the shape parameter of the Weibull distribution, characteristic life, and $B_{10}$ life for a concentric butterfly valve based on a statistical analysis of the reliability test data taken before and after the valve improvement. The difference in the shape and scale parameters between the existing and improved valves is reviewed using a statistical hypothesis test. The test results indicate that the shape parameter of the improved valve is similar to that of the existing valve, and that the scale parameter of the improved valve is found to have increased. These analysis results are particularly useful for a reliability qualification test and the determination of the service life cycles.

버터플라이 밸브는 일반적으로 유량을 조절하기 위해 사되는 유량 제어 장치의 일종이다. 본 연구에서는 중심형 버터플라이 밸브의 개선 전후 제품에 대한 신뢰성 시험 데이터의 통계적 분석을 통하여 버터플라이 밸브에 대한 와이블 분포의 형상모수, 특성수명 및 $B_{10}$ 수명을 추정한다. 또한 통계적 가설검정을 이하여 개선 전후 제품의 형상모수와 척도모수에 대한 차이를 검토한다. 가설검정 결과로부터 개선 전후 제품의 형상모수는 유사하며, 척도모수는 증가함을 알 수 있었다. 이러한 분석결과는 향후 신뢰성 인증시험이나 제품에 대한 보증수명 설정에 유한 정보로 활용될 수 있다.

Keywords

References

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