PC 사용 환경에 기반한 2.5 인치 하드 디스크의 수명주기 예측에 대한 연구

조의현(Euy-Hyun Cho),박정규(Jeong-Kyu Park),이민우(Min-woo Lee),권순무(Soon-Mu Kwon) 한국디지털콘텐츠학회 2014 한국디지털콘텐츠학회논문지 Vol.15 No.2

The mass storage of data and the importance of storage capacity lately has emerged. In this paper, we suggest the new method which estimate life cycle from acceleration life test about 2.5 inch hard disk driver as mass storage, which minimize the difference between real market annual failure rate and estimated failure rate. we obtain market transfer capacity per hours from returned 2.5inch hard disk drives about 309 numbers and accelerating transfer capacity per hours from acceleration life test. we calculate acceleration factor about duty cycle and estimate annual failure rate from failure rate and acceleration factors: temperature acceleration factor, duty cycle acceleration factor, the transfer capacity per hour represent the 93.4 % of user is 5.8 GB/hour, the transfer capacity per hour from acceleration life test is 81.4 GB/hour. the acceleration factor of duty cycle is 14.1. annual failure rate is stabilized at market one year after, annual failure rate is between 0.3 and 0.378. estimated annual failure rate is 0.4, so it is matched at 75~94 % between estimate annual failure rate and market annual failure rate. This study influence the estimate method of annual failure rate by the result of acceleration life cycle of manufacture.

가속수명시험을 이용한 굴삭기용 페달 밸브의 수명예측

유영철 ( Yung-chul Yoo ),정동헌 ( Dong-heon Jeong ),홍성훈 ( Sung-hoon Hong ),조용근 ( Yong-geun Cho ) 한국품질경영학회 2018 한국품질경영학회 학술대회 Vol.2018 No.-

가속수명시험을 이용한 자동차 도어 래치의 신뢰성 평가

정재훈(Jaehun Chung),양민식(Minsik Yang),손지훈(Jihoon Son),배철호(Cheolho Bai),심재술(Jaesool Shim),배영화(Younghwa Bae),김우엽(Wooyoub Kim),김정재(Jungjae Kim),김청산(Chungsan Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4

자동차 도어 래치는 차량에 승객이 탑승하기 위해 반드시 필요한 부품으로 도어의 Open/Close 뿐만 아니라 Lock/Unlock 과 같이 복합적인 기능을 수행한다. 차량 주행 중에 도어를 닫힌 상태로 유지하여야 하고 비상시 승객의 신속한 탈출을 위해 반드시 작동하여야 한다. 이와 같이 도어 래치는 자동차 안전 법규가 적용되는 부품으로 대단히 높은 신뢰도가 요구된다. 그러나 도어 래치는 다양한 기후에 의한 광범위한 기온에 노출되고 내부 기어류는 모터 동작에 의해 반복적인 하중을 받는다. 그러므로 스트레스 환경에서 높은 신뢰도를 만족하기 위해 누적고장률을 통한 정확한 수명 예측이 필수적이다. 본 연구는 도어 래치 내부의 다양한 부품에 대해 FMECA 와 QFD 기법을 이용하여 고장 메커니즘과 고장 인자를 정의하였으며 HALT를 통해 가속 수준을 결정하였다. 고장 메커니즘은 저온/고온과 하중에 의한 기어 파손이며 평화정공㈜의 시험 장비를 사용하여 -45℃ ~ 100℃의 온도 조건과 18V, 24V의 전압에 의한 하중 조건을 적용해 고장을 가속하였다. 10 개의 가속수명시험과 2 개의 보증 시험이 실시되었으며 신뢰구간을 고려하여 시험 조건별로 10 개의 샘플을 사용하였다. 다수준, 다인자 가속수명시험을 통해 공통형상모수와 수준별 척도모수를 구하였으며, 아이링 모형을 이용하여 온도와 하중의 복합 조건하에서 수명을 예측할 수 있다. Door latch of automobile is a necessary component for automobile passengers which performs not only Open/Close but also Lock/Unlock. Also, door latch is strongly controlled by automobile safety regulation and requires high reliability. Door latch is exposed to wide range of temperatures due to climate and repetitive load of motor is applied to gears. Therefore, estimation of cumulative failure rate and lifespan under stress condition is necessary. This research investigated various parts inside of latch and organized FMECA and QFD to analyze failure mechanisms and factors. Also, HALT was performed for acceleration level decision. Failure mechanism of door latch is gear damage due to high/low temperature and repetitive load. This research utilized PHA Co. Ltd’s testing equipment and applied temperature (-45℃ ~ 100℃) and load (18V, 24V) conditions to accelerate failure. 10 ALTs and 2 proof tests were conducted. Considering confidence interval, 10 samples were used for each test. Common shape parameter and scale parameters were derived as a result of multi-levels, factors ALT. By applying Eyring model, lifespan under specific temperature and load condition is estimated.

신경 회로망 기반의 전기 철도용 유입변압기 수명 예측 시스템

이희성,김정호,김백 한국철도학회 2020 한국철도학회논문집 Vol.23 No.3

전기철도용으로 설치된 유입변압기는 일반 전력용 변압기에 비해 철도차량에서 발생하는 고조파 성분들의 영향으로 절연열화가 더욱 빨리 진행되기 때문에 적합한 수명평가에 대한 기술이 필요하다. 본 논문은 전기철도용 유입변 압기의 수명을 평가하고 예측하기 위하여 유중에 녹아 있는 퓨란과 유중가스 중 수명과 관련 있는 성분을 추출하고, 추출된 데이터들을 이용하여 신경회로망을 학습하여 유입변압기 수명 평가 알고리즘을 제시한다. 우선 데이터를 획득하기 위하여 가속열화장치를 제작하여 100 o C에서 160 o C에 이르기까지 다양한 온도에서 가속열화 실험한 시료를 직접 추출 하였다. Gas Chromatography(GC)를 이용하여 유중가스에서 수소, 메탄, 아세틸렌, 에틸렌, 에탄가스를 추출하였으며, High Performance Liquid Chromatography(HPLC)를 이용하여 퓨란에서 2FAL, 5M2F, 2ACF, 5H2F, 2FOL 화합물을 추출하였다. 유중가스와 퓨란에서 추출된 성분들을 이용하여 multi-layer perceptron을 모델링하여 유입변압기의 수명 예측을 한다.

최소 극단치 분포를 이용한 자동차 도어 래치의 아이링 모델 가속 수명 예측을 위한 회귀 분석 방법 연구

손지훈(Jihoon Son),심재술(Jaesool Shim),배영화(Younghwa Bae),김우엽(Wooyoub Kim),김정재(Jungjae Kim),김청산(Chungsan Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

Door latch of automobile is a necessary component for automobile passengers which performs not only Open/Close but also Lock/Unlock. Also, door latch is strongly controlled by automobile safety regulation and requires high reliability. Door latch is exposed to wide range of temperatures due to climate and repetitive load of motor is applied to gears. Therefore, estimation of cumulative failure rate and lifespan under stress condition is necessary. Therefore, in this study, the theoretical Erying model accelerated life anaylsis, which is the zero failure test method, is proposed using Weibull distribution theory under the log relationship between the Weibull distribution and Minimum extreme value distribution. This research investigated various parts inside of latch which is defined failure mechanisms and factors using step of reliability analysis. Also, HALT was performed for acceleration level decision. Failure mechanism of door latch is gear damage due to high/low temperature and repetitive load and applied temperature (-45℃ ~ 100℃) and load (18V, 24V) conditions to accelerate failure. Common shape parameter and scale parameters were derived as a result of multi-levels, factors ALT. By applying Eyring model, lifespan under specific temperature and load condition is estimated. Also, the theoretical and experimental values predicted by regression analysis using the minimum extreme value distribution under the log relationship with the weibull distribution were compared. As a result, it was confirmed that there was no error in the two values, and it was possible to theoretically predict the multifactor acceleration life.

최소 극단치 분포를 이용한 자동차 도어 래치의 아이링 모델 가속 수명 예측을 위한 회귀 분석 방법 연구

손지훈(Jihoon Son),심재술(Jaesool Shim),배영화(Younghwa Bae),김우엽(Wooyoub Kim),김정재(Jungjae Kim),김청산(Chungsan Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

Door latch of automobile is a necessary component for automobile passengers which performs not only Open/Close but also Lock/Unlock. Also, door latch is strongly controlled by automobile safety regulation and requires high reliability. Door latch is exposed to wide range of temperatures due to climate and repetitive load of motor is applied to gears. Therefore, estimation of cumulative failure rate and lifespan under stress condition is necessary. Therefore, in this study, the theoretical Erying model accelerated life anaylsis, which is the zero failure test method, is proposed using Weibull distribution theory under the log relationship between the Weibull distribution and Minimum extreme value distribution. This research investigated various parts inside of latch which is defined failure mechanisms and factors using step of reliability analysis. Also, HALT was performed for acceleration level decision. Failure mechanism of door latch is gear damage due to high/low temperature and repetitive load and applied temperature (-45℃ ~ 100℃) and load (18V, 24V) conditions to accelerate failure. Common shape parameter and scale parameters were derived as a result of multi-levels, factors ALT. By applying Eyring model, lifespan under specific temperature and load condition is estimated. Also, the theoretical and experimental values predicted by regression analysis using the minimum extreme value distribution under the log relationship with the weibull distribution were compared. As a result, it was confirmed that there was no error in the two values, and it was possible to theoretically predict the multifactor acceleration life.

상수도관의 토양부식에 의한 수명예측평가

이주영(Ju-Yeong Lee),박경동(Kyeong-Dong Park) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-

Galvanized steel pipe, copper pipe and stainless steel pipe, which is being used in waterworks piping materials. In case of galvanized steel pipe, the precipitation of a product is being generated due to the pollution of the tap water, a white water phenomenon, and various corrosion reaction because a zinc ion is melted by tap water. And in case of a copper pipe, many problems which is harm in sanitation appeared because of a inflow of harmfulness substance by a frequent accident of a water leakage. So, to prevent these problems, it is substituted for stainless steel pipe. However, those problems is still occurring because of badness of welding, a problem of a water leakage in connection part, and a increment of construction expenses. Therefore, this research has examined the laying period according to each piping thickness and a corrosion shape according to each laying depth after laying in various soils(sandy loam, loamy, clay loam, clay) using galvanized steel pipe, copper pipe, and stainless steel pipe. That is, we has studied the data which is necessary for a rational method of preserving the quality of water by examining the corrosion properties of piping materials in the soil environment which waterworks piping materials is being used. In addition, in a waterworks supply, standardized data concerned to fundamental data and piping materials is not sufficient. So we has set up a purpose to develop the standardized system to develop the new method of construction.

발전용 고온 배관재료 2.25Cr1Mo 강의 크리프 특성과 LMP에 의한 크리프 수명의 예측

이상국(Sang Guk Lee),정민화(Min Hwa Chung),오세규(Sae Kyoo Oh),송정근(Jeong Keun Song) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.2

In this report, the creep properties and creep life estimation by Larson-Miller Parameter(LMP) Method for 2.25Cr1Mo steel to be used as power plant tubes or other components were presented at the high temperatures of 500, 550, and 600℃. It was confirmed experimentally and quantitatively that a creep life estimation equation at such various high temperatures was well derived by LMP and could be used very effectively within the creep life of 10³ hours, but very unreliable and even dangerous for design in a long term of creep life such as 10⁴ or 10<SUP>5</SUP> hours.

유무인무기체계에서 사용되는 질화갈륨(GaN) RF 반도체의 수명평가시스템 개발 및 수명예측 방안

최영락,강윤호,김형국 광운대학교 방위사업연구소 2023 선진국방연구 Vol.6 No.2

The aim of this study is to develop a testing system that applies RF (Radio Frequency) stress to predict the lifespan of GaN RF semiconductors, a subject of numerous ongoing domestication studies. Additionally, the study proposes an approach that considers the complex effects of degradation mechanisms in predicting lifespan. When testing the longevity of communication semiconductors, it’s essential to apply RF-input to replicate real-world conditions. The system we developed applies wideband, high power RF stress to individual samples. It monitors RF characteristic changes in real-time and provides independent control of temperature and voltage stress for each sample. This ensures both effective lifespan tests and real-time tracking of semiconductor degradation patterns. Unlike traditional GaAs semiconductors, GaN ones exhibit the compounded influence of degradation mechanisms during RF operation. Therefore, a new lifespan estimation method that identifies the IV characteristic parameters for each degradation mechanism and deduces a relationship between the DC-accelerated life test and the RF-accelerated life test was proposed. The proposed method is significant in that it provides foundational data necessary for the systematic planning of semiconductor reliability testing and the direction of test equipment development. If lifespan tests proceed using this proposed method and data related to degradation mechanisms is derived, it is anticipated to positively impact the future reliability improvement of GaN RF semiconductors.

바이오디젤 및 바이오디젤 혼합연료의 산화특성 연구에 의한 사용 수명 예측

정충섭(Jung, Chung-Sub),동종인(Dong, Jong-In),이영재(Lee, Young-Jae) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06

대두유로부터 생산된 바이오디젤과 바이오디젤 혼합 연료유를 대상으로 지방산메틸에스터 함량과 화학적 분석을 통해 산화 특성과 오일의 수명 예측 연구를 수행하였다. 바이오디젤, 경유, BD5, BD20은 산화가 진행될수록 산가(Acid number), 동점도(Kinematic Viscosity) 및 밀도(Density)는 증가하였다. 산가 측정결과의 활용에 의해 임의의 온도조건에서 정확한 사용수명을 예측하기 위하여 화학속도론에 의거하여 각각의 연료에 대한 사용수명식을 도출하였다. 도출된 사용수명식으로부터 바이오디젤이 가장 빠르게 산화가 진행되었고 바이오디젤 혼합량이 증가할수록 사용수명이 단축되는 것을 확인할 수 있었다.