• 제목/요약/키워드: Accelerated test

검색결과 1,532건 처리시간 0.033초

2006년 이후 발표된 가속수명시험 계획에 관한 문헌 연구 (A Review on the Accelerated Life Test Plan: 2006~2015)

  • 성시일
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제15권2호
    • /
    • pp.84-89
    • /
    • 2015
  • Accelerated life tests are widely used to evaluate the product reliability within a resonable amount of time and cost. This article provides literature review about accelerated life test plans between 2006~2015. The literature on planning accelerated life tests are reviewed with respect to the test scenario, assumed accelerated model and estimation method and optimization criteria. Finally, recommendations for the future research are presented.

소나무재의 촉진열화실험에 따른 재색변화에 대한 연구 (Study on the Color Changing of Pine by Accelerated Weathering Test)

  • 김광철
    • 한국가구학회지
    • /
    • 제23권2호
    • /
    • pp.152-162
    • /
    • 2012
  • The color changing of the wood surface was tested by accelerated weathering test that can simulate the outdoor condition with short period. In early parts of accelerated weathering test, weight and volume of specimen all were increased due to the moisture evaporation by its high temperature and illumination level, but weight and volume of specimen all were decreased from middle parts to last. However, significancy showed between control group and accelerated weathering test group in terms of weight and volume. According to the results of color-difference meter, in the early parts of the accelerated weathering test lightness, redness and yellowness all showed a clear increasing or decreasing trend. However, after three weeks all values were almost never change. Until the early parts of the test, lightness was decreased and there was not a considerable change after three weeks in the test. Redness showed a some change in early parts of the test, but this also showed not great change after middle parts of the test as like lightness. Yellowness also showed same pattern. These results could be verified through the visual inspection. As like weight and volume, significancy showed between control group and accelerated weathering test group in terms of color-difference test. In all accelerated weathering test group, color-differences of after test was lower than that of before test. To correctly analyze this cause, more additional research will be need on each of temperature, humidity and illumination factors.

  • PDF

성능특성치의 열화가 대수정규분포를 따를 때의 가속열화시험 모형 개발 (Planning of Accelerated Degradation Tests: In the Case Where the Performance Degradation Characteristic Follows the Lognormal Distribution)

  • 임헌상;성시일
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제18권1호
    • /
    • pp.80-86
    • /
    • 2018
  • Purpose: This article provides a mathematical model for the accelerated degradation test when the performance degradation characteristic follows the lognormal distribution. Method: For developing test plans, the total number of test units and the test time are determined based on the minimization of the asymptotic variance of the q-th quantile of the lifetime distribution at the use condition. Results: The mathematical model for the accelerated degradation test is provided. Conclusion: Accelerated degradation test method is widely used to evaluate the product lifetime within a resonable amount of cost and time. In this article. a mathematical model for the accelerated degradation test method is newly developed for this purposes.

촉매성 산화물 전극 (DSA, Dimensionally Stable Anode)의 가속수명 테스트 방법과 장치에 관한 기초 연구 (A Basic Study on Accelerated Life Test Method and Device of DSA (Dimensionally Stable Anode) Electrode)

  • 김동석;박영식
    • 한국환경과학회지
    • /
    • 제27권6호
    • /
    • pp.467-475
    • /
    • 2018
  • The lifetime of the electrode is one of the most important factors on the stability of the electrode. Since the lifetime of the DSA (Dimensionally stable anode) electrode is long, an accelerated lifetime test is required to reduce the test time. Beacuse there is no basis or standard method for accelerated lifetime testing, many researchers use different methods. Therefore, there is a need for basis and methods for accelerated lifetime testing that other researchers can follow. We designed a reactor system for accelerated lifetime testing and planned specific methods. Reactor system was circulating batch reactor. Reactor volume and cooling water tank were 12.5 L and 100 L, respectively. Electrode size was $2cm{\times}3cm$ (real electrolysis area, $5cm^2$). In order to maintain the harsh conditions, accelerated lifetime test was carried out in a high current density ($0.6A/cm^2$) and low electrolyte concentration (NaCl, 0.068 mol/L). Maintaining a constant temperature was an important operation parameter for exact accelerated lifetime test. As the accelerated lifetime test progressed, the active component of electrode surface was consumed and desorption occurred. At the point of 5 V rise, corrosion of the surface of the base material(titanium) also started.

누적손상이론을 이용한 풍력증속기의 가속수명시험법 개발 (Development of accelerated life test method for the wind turbine Gearbox using cumulative damage theory)

  • 손기수;곽희성;강창훈;조준행
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
    • /
    • pp.693-697
    • /
    • 2005
  • This study was performed to develop accelerated life test method of the wind-turbine gearbox using accumulated damage theory that used to model the fatigue of parts that receive variable load. The accumulated damage theory was introduced, and the estimation of life and calculation of accelerated life test time was illustrated. As the actual application example, accelerated life test method of the gearbox was described. Life distribution of the wind-turbine gearbox was supposed to follow Weibull distribution and life test time was calculated under the conditions of average life (MTBF) 140,600 hours and 99% reliability for one test sample According to the accumulated damage theory, because test time can shorten in case increase test load, test time could be reduced by 1.2 years when we put the load 1.2 times of rated load than 0.93 times of rated load that is equivalent load calculated by load spectrum of the wind turbine. This time, acceleration coefficient was 21.3. This accelerated test method was used to develop accelerated test method of gear reducer, gear and bearing as well as the industrial gearbox and it is considered to be applied comprehensively to mechanical parts the fatigue of which is happened by load or pressure etc.

  • PDF

누적손상이론을 이용한 기계류부품의 가속수명시험법 개발 (Development of Accelerated Life Test Method for Machanical Parts Using Cumulative Damage Theory)

  • 김대철;이근호;김형의
    • 연구논문집
    • /
    • 통권32호
    • /
    • pp.35-43
    • /
    • 2002
  • This study was performed to develop accelerated life test method of machanical parts using cumulative damage theory that used to model the fatigue of parts that receive variable load. The cumulative damage theory was introduced, and the estimation of life and calculation of accelerated life test time was illustrated. As the actual application example, accelerated life test method of agricultural tractor transmission was described. Life distribution of agricultural tractor transmission was supposed to follow Weibull distribution and life test time was calculated under the conditions of average life (MTBF) 3,000 hours and 90% reliability for one test sample. According to the cumulative damage theory, because test time can shorten in case increase test load, test time could be reduced by 482 hours when we put the load 1.1 times of rated load than 0.73 times of rated load that is equivalent load calculated by load spectrum of the agricultural tractor. This time, acceleration coefficient was 11.7. This accelerated test method was used to develop accelerated test method of gear reducer, hydraulic hose and bearing as well as agricultural tractor transmission and it is considered to be applied comprehensively to machanical parts the fatigue of which is happened by load or pressure etc.

  • PDF

지게차용 엔진식 드라이브 액슬 수명평가를 위한 가속수명시험 선정 연구 (Accelerated Life Test Selection Study for Life Evaluation of Engine Type Drive Axle for Forklift)

  • 김준영;유영준;이철희
    • 드라이브 ㆍ 컨트롤
    • /
    • 제20권3호
    • /
    • pp.9-14
    • /
    • 2023
  • In this paper, the selection of a reliable accelerated life test code for a 2-ton forklift was accomplished by choosing the driving resistance coefficient failure-free test time based on a 10,000-hour B10 life. The overall life and average equivalent load of the vehicle were then calculated based on actual driving test conditions using the selected driving resistance coefficient. The gear train's accelerated life test code was selected by adjusting the equivalent load to a torque and rotation speed that did not exceed 125%(about 75HP) of the vehicle rated power. The safety of the test standards was validated by conducting an actual accelerated life test utilizing the proposed test method in this study and comparing the test result with the corresponding theoretical value. It is anticipated that the reliability of the accelerated life test in this paper will be enhanced, by incorporating actual driving performance data collected directly from the forklift and adjusting the conditions used in developing the accelerated life test code.

광통신용 1.25Gbps Transceiver 가속수명시험 (Accelerated Life Test for 1.25Gbps Transceiver)

  • 윤광수;유정희;허영순
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2008년도 추계학술대회A
    • /
    • pp.1391-1393
    • /
    • 2008
  • In this paper, the long-term reliability for 1.25G transceiver in use of high speed optical access network is investigated. High temperature storage tests and accelerated life tests are used to long-term reliability. Accelerated aging test have been during 3,000 hour of the three accelerated aging conditions by caused high temperature stress. Mean life is assumed to follow the Arrhenius relationship and analysis from the failure data obtained in the accelerated aging conditions.

  • PDF

전자제품용 컴프레서의 가속열화시험에 관한 연구 (An Accelerated Degradation Test of a Electronics Appliance Compressor)

  • 이후진;윤원영
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제10권1호
    • /
    • pp.25-38
    • /
    • 2010
  • In this paper, an accelerated degradation test procedure for an electronic appliance compressor is proposed. We investigate the amount of wear of the compressor and consider several factors as accelerating factors. Finally we select the operating pressure as a main accelerating factor. The test condition of accelerated degradation test is determined. The modified accelerating test reduces the test time in design phase by using the suggested accelerating factor.

자동차 환경을 고려한 커넥터의 가속시험에 관한 연구 (Highly Accelerated Life Tests for Auto-Connector in Use-Environment)

  • 김종걸;김진환
    • 대한안전경영과학회:학술대회논문집
    • /
    • 대한안전경영과학회 2004년도 추계학술대회
    • /
    • pp.229-235
    • /
    • 2004
  • This paper treats accelerated life tests for automotive connector. The contact resistance of connector is explained by some factors; the use time(calender time, real cycle), stresses and loads adapted in auto test. The relationships between contact resistance and some factors are compared and analyzed by regression models in various test conditions; field use-environment, manufacturer's test environment, and accelerated test condition. The consistency between of manufacturer's test and field test is examined. Finally, the future study on accelerated test for automotive connector is presented.

  • PDF