ALT 2 - Application of Accelerated Life Testing (ALT) Concepts and Practical Methodologies (Session 8D) $150.00
Practical applications of accelerated life testing are considered in this session. In this session papers include shaft-seals with complex failure modes, applications to avionics, accelerated tests for software, and a case study of quartz flexible accelerometers.

Moderator
Jon G. Elerath, SolFocus

Accelerated Testing of Shaft Seals as Components with Complex Failure Modes (Paper 8D1)
Benjamin Klein. Daniel Kirschmann, Werner Haas, and Bernd Bertsche, Dr.-Ing., Universitaet Stuttgart
In many cases of sealing rotating components in mechanical engineering radial shaft seals (RSS) are used. These components can still not be included in the lifetime calculation of a system. In this paper the difficulty of accelerated testing of RSS is presented. To show the complexity of this component, the fundamentals, as the concept of the RSS as a sealing system, the influences on lifetime, the definition of the failure and the failure modes, are a main part.
A Practical Approach Accelerated Stress Testing Avionics Products (Paper 8D2)
Michael Zimmermann, Rockwell Collins, Inc.
Much has been published regarding the benefits of accelerated stress testing; however, it seems that much of the literature has been related to low(er) cost/complexity commercial and automotive products. This paper outlines a practical test method for high cost/performance commercial/military avionics products, while addressing the associated challenges of limited sample size and applying stresses in a manner that uncovers defects without overstressing the product too early in the test process.
Software Reliability Accelerated Testing Method Based on Mixed Testing (Paper 8D3)
Yumei Wu, Beijing Univ of Aeronautics & Astronnautics, Yongqi Zhang, China Telecom, and Minyan Lu, Beijing of Aeronautics & Astronnautics
The software reliability accelerated testing method (SRAT) is proposed to improve the efficiency of software reliability testing. The software reliability assessment model based on the SRAT is also presented, its effectiveness and validity is verified. A thorough case study done for the web based software system is introduced in this paper.
Useful Life Prediction Quartz Flexible Accelerometers Using Accelerated (Paper 8D4)
Huiguo Zhang, Yunxia Chen, and Rui Kang, Beihang University
This paper presents a case study of a useful life prediction for quartz flexible accelerometers. Performance degradation data under several thermal and vibration loading is obtained from an accelerated test. Accelerated degradation models are developed from test record using regression analysis. And degradation models were verified via step-stress accelerated testing by computing cumulative damage rates. Using the verified models, useful life is predicted.