• 제목/요약/키워드: Accelerated life data

검색결과 217건 처리시간 0.029초

A Profile Analysis about Thermal Life Data of Electrical insulating materials at Accelerated Life Test

  • Bark, Shim-Kyu
    • 한국멀티미디어학회논문지
    • /
    • 제13권12호
    • /
    • pp.1814-1819
    • /
    • 2010
  • Since 1987, when statistical analyzing guide for thermal life test of Accelerated Life Test(ALT) was proposed as ANSI/IEEE Std 101, this guide has been used widely for many experiment data. Shim(2004) had done Monte Carlo simulation to compare life of two different systems or materials, based on statistic values obtained from ANSI/IEEE Std 101 data. In this study, a profile analysis is proposed for comparing life of two different systems or materials, and some examples using pre-existing data are given.

Optimal M-level Constant Stress Design with K-stress Variables for Weibull Distribution

  • Moon, Gyoung-Ae
    • Journal of the Korean Data and Information Science Society
    • /
    • 제15권4호
    • /
    • pp.935-943
    • /
    • 2004
  • Most of the accelerated life tests deal with tests that use only one accelerating variable and no other explanatory variables. Frequently, however, there is a test to use more than one accelerating or other experimental variables, such as, for examples, a test of capacitors at higher than usual conditions of temperature and voltage, a test of circuit boards at higher than usual conditions of temperature, humidity and voltage. A accelerated life test is extended to M-level stress accelerated life test with k-stress variables. The optimal design for Weibull distribution is studied with k-stress variables.

  • PDF

The least squares estimation for failure step-stress accelerated life tests

  • Kim, In-Ho
    • Journal of the Korean Data and Information Science Society
    • /
    • 제21권4호
    • /
    • pp.813-818
    • /
    • 2010
  • The least squares estimation method for model parameters under failure step-stress accelerated life tests is studied and a numerical example will be given to illustrate the proposed inferential procedures under the compound linear plans proposed as an alternative to the optimal quadratic plan, assuming that the exponential distribution with a quadratic relationship between stress and log-mean lifetime. The proposed compound linear plan for constant stress accelerated life tests and 4:2:1 plan are compared for various situations. Even though the compound linear plan was proposed under constant stress accelerated life tests, we found that this plan did well relatively in failure step-stress accelerated life tests.

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

가속수명시험을 이용한 쇼트피닝가공 알루미늄 합금의 신뢰성 평가에 관한 연구 (A Study on the Reliability Evaluation of Shot Peened Aluminium Alloy Using Accelerated Life Test)

  • 남지헌;강민우;정성균
    • 대한기계학회논문집A
    • /
    • 제30권12호
    • /
    • pp.1534-1542
    • /
    • 2006
  • In this paper, the concept of accelerated life test, which is a popular research field nowadays, is applied to the shot peened material. To predict the efficient and exact room temperature fatigue characteristics from the high temperature fatigue data, the adequate accelerated model is investigated. Ono type rotary bending fatigue tester and high temperature chamber were used for the experiment. Room temperature fatigue lives were predicted by applying accelerated models and doing reliability evaluation. Room temperature fatigue tests were accomplished to check the effectiveness of predicted data and the adequate accelerated life test models were presented by considering errors. Experimental result using Arrhenius model, fatigue limit obtain almost 5.45% of error, inverse power law has about 1.36% of error, so we found that inverse power law is applied well to temperature-life relative of shot peened material.

Asymptotics for Accelerated Life Test Models under Type II Censoring

  • Park, Byung-Gu;Yoon, Sang-Chul
    • Journal of the Korean Data and Information Science Society
    • /
    • 제7권2호
    • /
    • pp.179-188
    • /
    • 1996
  • Accelerated life testing(ALT) of products quickly yields information on life. In this paper, we investigate asymptotic normalities of maximum likelihood(ML) estimators of parameters for ALT model under Type II censored data using results of Bhattacharyya(1985). Further illustrations include the treatment of asymptotic of the exponential and Weibull regression models.

  • PDF

소자의 수명 예측을 위한 Weibull Step-Stress Type-I Model (Weibull Step-Stress Type-I Model Predict the Lifetime of Device)

  • 정재성;오영환
    • 전자공학회논문지A
    • /
    • 제32A권6호
    • /
    • pp.67-74
    • /
    • 1995
  • This paper proposes the step-stress type-I censoring model for analyzing the data of accelerated life test and reducing the time of accelerated life test. In order to obtain the data of accelerated life test, the step-stress accelerated life test was run with voltage stress to CMOS Hex Buffer. The Weibull distribution, the Inverse-power-law model and Maximum likelihood method were used. The iterative procedure using modified-quasi-linearization method is applied to solve the nonlinear equation. The proposed Weibull step-stress type-I censoring model exactly estimases the life time of units, while reducting the time of accelerated life test and the equipments of test.

  • PDF

독립현가형 AWD 차량의 구동축 가속 수명 평가에 관한 연구 (A Study on the Accelerated Life Evaluation of Drive Shaft for Independent Suspension type AWD Vehicle)

  • 김도식
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제11권4호
    • /
    • pp.343-356
    • /
    • 2011
  • This paper proposes an accelerated life evaluation of drive shaft. The life test of drive shaft for independent suspension type AWD vehicle should be performed by use of the least test sample because many number of samples can't be used for the test because of its mass capacity and high price. We calculated the no failure test time by application of no failure test concept, and the already performed test data for drive shaft are applied for some kinds of reliability coefficients which are needed for calculation of life test time. And, for analysis of real driving condition of vehicle, the load spectrum is prepared using the needed road condition and vehicle data. The inverse power model is used for accelerated life test. The equivalent torque of load spectrum is achieved by use of Miner's Rule, and then the final accelerating condition is determined by decision of the accelerated test torque. This paper shows that the accelerated life test results corresponds with the target life and the proposed life test method can be very well applied to no failure life test for mass capacity machinery components.

Accelerated Life Test Plans Based on Small Sample Property

  • Yun, Won Young
    • 품질경영학회지
    • /
    • 제23권1호
    • /
    • pp.41-49
    • /
    • 1995
  • This paper suggests optimal accelerated constant stress life tests in Exponential distribution. The relationship between the log-mean life and the loaded stress is assumed to be linear. Optimal plans considering mean square errors of maximum likelihood estimators of the log mean life and test costs are obtained. We consider accelerated life tests with two stress levels, and as data types, failure censoring( type II) and time censoring(type I) data are used. We propose the procedure to obtain the optimal plans for each case. Some examples are also included.

  • PDF

가속화 수명 실험에서의 비모수적 추론 (Nonparametric Inference for Accelerated Life Testing)

  • 김태규
    • 품질경영학회지
    • /
    • 제32권4호
    • /
    • pp.242-251
    • /
    • 2004
  • Several statistical methods are introduced 1=o analyze the accelerated failure time data. Most frequently used method is the log-linear approach with parametric assumption. Since the accelerated failure time experiments are exposed to many environmental restrictions, parametric log-linear relationship might not be working properly to analyze the resulting data. The models proposed by Buckley and James(1979) and Stute(1993) could be useful in the situation where parametric log-linear method could not be applicable. Those methods are introduced in accelerated experimental situation under the thermal acceleration and discussed through an illustrated example.