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by Fred Schenkelberg 4 Comments

Reading a Datasheet

Reading a Datasheet

Reading a datasheet to determine a reliability value may take some investigative work. Whenever I see a fit rate based on failure-free testing, I am curious about how they did the testing and the calculations. [Read more…]

Filed Under: CRE Preparation Notes, Probability and Statistics for Reliability, Reliability in Design and Development, Reliability Modeling and Predictions Tagged With: failure mechanism, failure mechanisms, Failure Rate, Poisson Distribution

by Richard Coronado 2 Comments

Series System

Series System

During design and development, Reliability Engineers often receive reliability parameters in many forms. The most common reliability parameter is the mean time to failure (MTTF), which can also be specified as the failure rate (this is expressed as a frequency or Conditional Probability Density Function (PDF)) or the number of failures during a given period. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Modeling and Predictions Tagged With: distribution, model, PDF, Reliability block diagrams and models, Series System, weibull

by Fred Schenkelberg 5 Comments

Parallel Systems

Parallel Systems

Speaking reliability-wise, parallel, means any of the elements in parallel structure permit the system to function. This does not mean they are physically parallel (in all cases), as capacitors in parallel provide a specific behavior in the circuit and if one capacitor fails that system might fail.
In this simple drawing, there are n components in parallel and any one component is needed for the system to function. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Modeling and Predictions Tagged With: parallel system, Reliability block diagrams and models, Series System, system reliability

by Fred Schenkelberg 1 Comment

Weakest Link

Weakest Link

Each piece of gear used in rock climbing has the potential to be the weakest link. Often, based on accident reports, it the human decisions or lack of focus that is the most difficult to improve.

Ropes, anchors, harness, and carabiners and another equipment all have to work in the event of a fall. The design of each piece of equipment is to meet and hopefully exceed any possible load. And, to maintain the needed strength over years of harsh outdoor use. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Modeling and Predictions Tagged With: Exponential Distribution, Reliability block diagrams and models, Series System

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CRE Preparation Notes

Article by Fred Schenkelberg

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