| 제목 |
철도차량 구조물의 확률론적 피로수명 평가 |
| 분야 |
기타 |
| 언어 |
Korean |
| 저자 |
구병춘(한국철도기술연구원), 서정원(한국철도기술연구원) |
| Key Words |
Limit state function(한계 상태 방정식), Miner's rule(마이너의 법칙), Monte Carlo simulation(몬테카를로 시뮬레이션), Reliability index(신뢰성 지수), Structural integrity(구조 건전성) |
| 초록 |
Rolling stock structures such as bogie frame and car body play an important role for the support of vehicle loading. In general, more than 25 years' durability is needed for them. A lot of study has been carried out for the prediction of the fatigue life of the bogie frame and car body in experimental and theoretical domains. One of the new methods is a probabilistic fatigue life evaluation. The objective of this paper is to estimate the fatigue life of the bogie frame of an electric car, which was developed by the Korea Railroad Research Institute (KRRI). We used two approaches. In the first approach probabilistic distribution of S-N curve and limit state function of the equivalent stress of the measured stress spectra arc used. In the second approach, limit state function is also used. And load spectra measured by strain gauges are approximated by the two-parameter Weibull distribution. Other probabilistic variables are represented by log-normal and normal distributions. Finally, reliability index and structural integrity of the bogie frame are estimated. {{br}} |
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