Availability, Maintainability, and Serviceability

Reliability of Repairable Systems vs. Non-Repairable Systems

Aron Rolnitzky · Dec 1, 2011 · 1 Comment

When performing various reliability tasks, non-repairable systems or products are treated differently from repairable systems or products. Some of the tools that are used for one type are not applicable to the other. Obviously, at some level, repairable systems are composed of non-repairable parts. Examples of non-repairable systems would be “one-shot” devices like light bulbs or more complex devices like pacemakers. Examples of repairable systems are computers, automobiles, and airplanes. What is unique about repairable systems? Availability becomes a key measure of importance. In simple terms, availability is the percentage of time that the product or system is able to perform its required functions. When the required functions cannot be performed because a failure has …

Analyzing Data for Repairable Systems

Greg Larsen · May 5, 2010 · Leave a Comment

Many of the "standard" reliability methods are intended for non-repairable systems. That is, when a component, sub-assembly or system fails, it is not repaired and returned to service. The Weibull distribution and other well-known distributions which effectively describe the time to failure assume the failures are "terminal". That is, the whole system is replaced. In contrast, repairable systems may fail multiple times during their lifetimes and this results in "recurrent events" in which system components may be repaired or replaced to bring the system back on line. In this case, a single system actually has multiple ages, i.e. components which have been repaired or replaced are "younger" than the rest of the system. Reliability data comprised of recurrent events should be …

High-Availability Systems

Bob Bowman · Jun 27, 2009 · 1 Comment

Hardware Availability is a function of hardware reliability and the maintainability/serviceability features of that hardware. The principle way of achieving availability goals is to first achieve the reliability goals. This is the most cost-effective way for both the producer and customer to achieve these goals. However, even with the best design and manufacturing practices, random failures will still occur in complex systems. Some of these will result in system outages for a simple non redundant configuration. Service then becomes extremely important in limiting the system downtime to a small period of time. Again, the key to achieving high-availability is to increase the reliability of the system as much as reasonably possible in a cost-effective manner. This requires a two phase …

Reliability Lab Testing, Consulting, Training.

Availability, Maintainability, and Serviceability

Reliability of Repairable Systems vs. Non-Repairable Systems

Analyzing Data for Repairable Systems

High-Availability Systems

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