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Benefits of Reliability Engineering
We see the terms ‘reliable’ and ‘reliability’ in daily advertising, business names and in casual conversations on a regular basis. Reliability has meaning and importance in our society. Product and brand reputations are made or broken by their product reliability performance.
Reliability engineering or the work to minimize failures, improve maintenance…
Censored Data and CDF Plotting Points
Reliability testing and data collection is messy business. We rarely receive perfect data where all units involved have a precise time to failure record. Sometimes we do not precise time to failure information or some of the units are still operating.
The data is censored. There are a few common types of censoring each of which have statistical techniques to…
4 Electronic Nondestructive Evaluations
It is possible to use the circuit design or the circuit itself to evaluate electronics. This ranges from checking is the system is wired correctly (the right parts are present and attached properly) to a complex evaluation including the proper functioning of firmware and attached software.
Beyond visual inspection, we need a way to evaluate the microscopic…
8 Nondestructive Evaluation Techniques
There are times when we need to evaluate a product to determine is it assembled correctly or when looking for clues concerning a failure mechanism. Simple visual inspection may be sufficient and there are times when we need more information or detail.
A great first step is the use of an appropriate nondestructive evaluation (NDE) method. Done correctly we…
8 factors of design for maintainability
The first time I changed the oil filter of my car (first car in high school) I smashed my knuckles against an grimy block of metal. More than once. It may have been my lack of experience or improper tools. Or, it may have been a rather poor design
Watching the Indy 500, especially the pit stops, I quickly realized there has to be something different about…
Considerations for Reliability Testing
Reliability testing to determine what will fail or when will failures occur is expensive. Organizations invest in the development of a product and attempt through the design process to create a product that is reliable.
The design process has many unknowns though. This includes uncertainties about materials, design margins, use environments, loads, and aging…
Looking for failure data
Beyond understanding what will fail (failure mechanisms) we need to know when a system will fail. Both what and when information can be found in a variety of sources. Unlike the stock market where we are regularly warned that past performance does not indicate future performance, in reliability engineering past performance is the best predictor of future performance.
The other day a student said they are asking for failure dates, not failure rates. That is a marked improvement when requesting information for the many sources of reliability information. It is not sufficient though.
Also ask for the type of failures expected or encountered during the testing or observation. (more…)
Types of Reliability Data
We rely on data to make decisions, to reveal patterns or trends, to learn about our systems and world. Data has many forms and sources. Reliability data may provide what will fail and/or when a device will fail. (more…)