Analysis of step-stress accelerated-life-test data: a new approach

Tang, Loon Ching; Sun, Yabin; Goh, T. N.; Ong, H. L.

doi:10.1109/24.488919

Cited by 63 publications

(26 citation statements)

References 9 publications

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“…In Table 1, the first column represents the temperature level at each time interval of length 168 h. The last column is the empirical estimation of the failure rate obtained using the strategy described in Section 2.1, equation (9). These can be compared with the values in fifth column, which were used to simulate the data.…”

Section: Simulated Datamentioning

confidence: 99%

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An inference method for temperature step‐stress accelerated life testing

Gouno

2001

Quality & Reliability Eng

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Section: Simulated Datamentioning

confidence: 99%

“…Dietrich and Mazzuchi [6] also suggests a Bayesian method with multi-step-stress. More recently Khamis [7], Khamis and Higgins [8] and Tang et al [9] proposed new models. A chapter is devoted to stepstress in Nelson [10].…”

mentioning

confidence: 98%

An inference method for temperature step‐stress accelerated life testing

Gouno

2001

Quality & Reliability Eng

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“…The step-up voltage application method is used to acquire sufficient measurement data efficiently. This method is capable of damaging the oil-paper insulation in the same extent compared with the constant voltage application method [19][20][21].…”

Section: Voltage Application Methodsmentioning

confidence: 99%

Partial Discharge of Needle-Plane Defect in Oil-Paper Insulation under AC and DC Combined Voltages: Developing Processes and Characteristics

Sun

Zhu

et al. 2017

Energies

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Partial discharge (PD) behaviors of oil-paper insulation is distinctive in AC and DC combined electric fields in converter transformers from PD behaviors in pure AC or DC electric fields. The present study focuses on the PD developing processes and characteristics of oil-paper insulation systems with needle-plane defects under different AC/DC proportions. The degradation of oil-paper insulation can be accelerated by PD pulses incurred by needle-plane defects. AC-DC combined voltages are applied to the needle-plane defect model simultaneously in the established experimental platform, and the proportions of AC/DC voltages are decided according to the cases in actual converter transformers. The developing processes from the initiation of partial discharge until final breakdown were observed for each AC/DC proportion. PD parameters and patterns were acquired by a detector using the pulse current method. The test results indicate that the inception and breakdown voltages increase with the increase of the DC component in AC-DC combined voltages. However, pulse repetition rate and amplitude of PD shows a descending trend when AC/DC proportion decreases. Meanwhile, the PD recurrence rate in the phase between 180 • and 360 • becomes higher than that in the phase between 0 • and 180 • at the initial stage as the DC proportion increases; high-amplitude discharges mainly occur in the phase range between 180 • and 360 • when the pressboard is close to breakdown. The current study is useful in further research on fault diagnosis in converter transformers.

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“…For example, a non-parametric approach was suggested by Tyoskin and Krivolapov 2 in order to obtain the interval estimation of reliability measures. Tang et al 3 proposed an alternative model to the popular cumulative-exposure model to deal with time transformation under step-stress. Khamis and Higgins 4 introduced a new model to overcome the intractability of the Weibull cumulative-exposure model and to deal with the parameter estimation problem.…”

Section: Introductionmentioning

confidence: 99%

Optimum step‐stress for temperature accelerated life testing

Gouno¹

2007

Quality & Reliability Eng

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Step-stress accelerated life testing is a design strategy where the stress is modified several times during the test. In this work we address the problem of designing such a test. We focus on temperature accelerated life testing and we address the problems of setting the step duration and the stress levels. Assuming an Arrhenius model, maximum likelihood estimates of the parameters are computed. Relying on the properties of these estimators we compare different criteria for assessing the optimality of the plans produced. Some tables are presented to illustrate the method. For a fixed number of steps and a set of temperatures, a table of optimal length steps can be computed. For fixed step lengths, sets of temperatures leading to optimal plans are also available. Thus, this work provides useful tools to help engineers make decisions in testing strategy.

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Analysis of step-stress accelerated-life-test data: a new approach

Cited by 63 publications

References 9 publications

An inference method for temperature step‐stress accelerated life testing

An inference method for temperature step‐stress accelerated life testing

Partial Discharge of Needle-Plane Defect in Oil-Paper Insulation under AC and DC Combined Voltages: Developing Processes and Characteristics

Optimum step‐stress for temperature accelerated life testing

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