Session: 8D, Tuesday, 26 January 2010, 1545-1745Â
Moderator: Jon G. Elerath, SolFocus
Practical applications of accelerated life testing are considered in this session. Papers in this session include shaft-seals with complex failure modes, applications to avionics, accelerated tests for software, and a case study of quartz flexible accelerometers.
Papers:
8D1 [0085] ACCELERATED TESTING OF SHAFT SEALS AS COMPONENTS WITH COMPLEX FAILURE MODESÂ by 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.
8D2 [0034] A PRACTICAL APPROACH TO ACCELERATED STRESS TESTING FOR AVIONICS PRODUCTS by 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.
8D3 [0124] SOFTWARE RELIABILITY ACCELERATED TESTING METHOD BASED ON MIXED TESTING by Yumei Wu, Beijing Univ of Aeronautics & Astronnautics, Yongqi Zhang, China Telecom, and Minyan Lu, Beijing Univ 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.
8D4 [0164] USEFUL LIFE PREDICTION FOR QUARTZ FLEXIBLE ACCELEROMETERS USING ACCELERATED by 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.
Application of Accelerated Life Testing (ALT) Concepts and Practical Methodologies
Session: 8D, Tuesday, 26 January 2010, 1545-1745Â
Moderator: Jon G. Elerath, SolFocus
Practical applications of accelerated life testing are considered in this session. Papers in this session include shaft-seals with complex failure modes, applications to avionics, accelerated tests for software, and a case study of quartz flexible accelerometers.
Papers:
8D1 [0085] ACCELERATED TESTING OF SHAFT SEALS AS COMPONENTS WITH COMPLEX FAILURE MODESÂ by 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.
8D2 [0034] A PRACTICAL APPROACH TO ACCELERATED STRESS TESTING FOR AVIONICS PRODUCTS by 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.
8D3 [0124] SOFTWARE RELIABILITY ACCELERATED TESTING METHOD BASED ON MIXED TESTING by Yumei Wu, Beijing Univ of Aeronautics & Astronnautics, Yongqi Zhang, China Telecom, and Minyan Lu, Beijing Univ 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.
8D4 [0164] USEFUL LIFE PREDICTION FOR QUARTZ FLEXIBLE ACCELEROMETERS USING ACCELERATED by 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.