Accelerated life testing (ALT) is widely conducted to obtain failure-time data in a much shorter time and to make inference about reliability at normal conditions. The accuracy of the reliability prediction is dependent on well-designed ALT plans. A stepstress ALT allows the test condition to change at a given time or upon the occurrence of a specified number of failures. In this paper, we prop...

The R package ALTopt has been developed with the aim of creating and evaluating optimal experimental designs of censored accelerated life tests (ALTs). This package takes the generalized linear model approach to ALT planning, because this approach can easily handle censoring plans and derive information matrices for evaluating designs. Three types of optimality criteria are considered: D-optima...

Accelerated life test (ALT) is currently the main method of assessing product reliability rapidly, and the design of effi‐ cient test plans is a critical step to ensure that ALTs can assess the product reliability accurately, quickly, and economi‐ cally. With the promotion of the national strategy of civil‐military integration, ALT will be widely used in the research and development (R&D) of va...

The main objective of accelerated life tests (ALTs) is to predict fraction failings of products in the field. However, there are often discrepancies between the predicted fraction failing from the lab testing data and that from the field failure data, due to the yet unobserved heterogeneities in usage and operating conditions. Most previous research on ALT planning and data analysis ignores the...

ALT (accelerated life tests) are widely used to provide quickly the information about life distributions of products. Life data at elevated stresses are extrapolated to estimate the life distribution at design stress. The existing estimation methods are efficient and easy to implement—given sufficient life data. However, ALT frequently results in few or no failures at low-level stress, making i...

A novel adaptive multiple dependent state sampling plan (AMDSSP) was designed to inspect products from a continuous manufacturing process under the accelerated life test (ALT) using both double (DSP) and (MDSSP) concepts. Under conditions, lifetime of product follows Weibull distribution with known shape parameter, while scale parameter can be determined acceleration factor (AF). The Arrhenius ...

Accelerated life test (ALT) planning in Bayesian framework is studied in this paper with a focus of differentiating competing acceleration models, when there is uncertainty as to whether the relationship between log mean life and the stress variable is linear or exhibits some curvature. The proposed criterion is based on the Hellinger distance measure between predictive distributions. The optim...

ings, continued skin care, remedial exercises, and repeated self-massage.10,11 Because lymphedema is a chronic disorder, the major shortcoming of the maintenance phase is sustaining the patient’s compliance with required preventative techniques.8,11 A novel approach to the lymphedema maintenance phase is aqua lymphatic therapy (ALT), which provides patients in the maintenance phase of lymphedem...

< p>Accelerated Life Testing (ALT) is very important in evaluating the reliability of highly reliable products. According to ALT procedure, products undergo higher stress levels than normal conditions to reduce the failure times. ALTs have been studied for various conditions and stresses. In addition to common stress such as temperature and humidity, random usage can also be considered as anoth...