Interpreting Test Results

Abstract

Carl and Fred discussing a listener question about reliability demonstration testing; specifically how to deal with unrelated failures when using “success testing.”

Key Points

Join Carl and Fred as they discuss “success testing,” and the assumptions and principles that need to be considered.

Topics include:

• Planning and interpreting binomial testing


• Pass-fail testing versus test-to-failure


• What assumptions go into “success testing”?


• Example of cracked glass in a device


• The importance of understanding the underlying failure mechanisms


• What happens when different mechanisms of failure are lumped together?


• The role of confidence interval in success testing


• What happens when unrelated failures are not independent?


• Can system testing be designed, without using Weibull parameters?


• When designing a test, how do you include the user conditions?


• When can you assume independence of failure mechanisms in a complex structure?


• Ask questions about how the planned tests represents the real world

Enjoy an episode of Speaking of Reliability. Where you can join friends as they discuss reliability topics. Join us as we discuss topics ranging from design for reliability techniques to field data analysis approaches.

Show Notes

Information about the relationship between sample size, testing time, confidence, and reliability can be found in a book titled “Statistical Design and Analysis of Engineering Experiments,” by Charles Lipson and Narenda Sheth, McGraw Hill, 1973. Reference section 5.4, page 178.

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