Speedier Reliability Analysis

Article

Hahn, Gerald J.; Meeker, William Q.; Doganaksoy, Necip   (2003, ASQ)   GE Global Research Center, Schenectady, NY; Iowa State University, Ames, IA

Quality Progress    Vol. 36    No. 6
QICID: 19126    June 2003    pp. 58-64
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Article Abstract

Customers demand high reliability in new products. The fact that product development usually lasts no more than one year, from design to production, means that accelerated life tests (ALTs) are critical. ALTs are one element of a reliability assurance program (HALT). There are several types of accelerated testing: use-rate acceleration, which assumes that product life can be adequately modeled by cycles of operation; product aging acceleration, which involves exposing test units to severe environments; and product stress acceleration, which involves increasing the stress under which test units operate. Product aging and product stress ALTs require testing one or more accelerated variables, including temperature, pressure, and voltage. Some ALTs are based on both physical theory and empirical experience. ALTs are conducted within strict cost and time constraints and it is important at the outset to define the reliability goal and determine the time available for testing based upon the product release date. Important cautionary considerations when conducting an ALT include the dangers of extrapolation, downstream ALTs, baseline testing, multiple accelerating variables, degradation data, and step stress testing.

Keywords

Reliability,Life testing,Degradation,Weibull distribution,Product quality,Residual analysis,Product development


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