Musings on reliability and maintenance topics

Short essays and thoughts (musings) on reliability and maintenance engineering topics. Let me know your reaction and thought, plus any questions.
ISSN 2329-0080

Quick Introduction to Worst Case Analysis

May 21, 2015
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Worst-Case Tolerance Analysis Worst-case tolerance analysis is the starting point when creating a tolerance specification. It is a conservative approach as it only considers the maximum or minimum values of part variation—whichever leads to the worst situation. Setting tolerances such that the system will function given the expected variation of manufactured components improves that ability of […]

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Reliability Questions for the Drone Industry

May 9, 2015

Exploring Drone Reliability In a few Twitter conversations I’ve learned about the perceived lack of reliability of commercially available quadcopter or drones. And, being encouraged to write a paper or two on drone reliability. Now that Amazon has a delivery drone patent, and industrial applications continue to announced daily, there is a need for serious […]

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How to Be Deliberately Proactive

May 7, 2015
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How to Be Deliberately Proactive It is not enough to simply state your organization has a proactive stance concerning reliability. It more than running a few tests or thinking about reliability before the product ships or the equipment is installed. It is a way of doing business.

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Reliability Questions to Ask During a Review

April 29, 2015
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Reliability Questions to Ask During a Review Asking the right question is important. During a review meeting (informal or formal) asking a few reliability questions may reveal weaknesses, strengths, or uncertainty. The design team has many priorities and reliability is often difficult to estimate, yet knowing what is and isn’t known provides a clear picture […]

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Specify Reliability Goals and Expect an Argument

April 23, 2015
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Supplier Reliability Case Selecting as supplier for components or subsystems involved many aspects including the desired reliability performance. Once selected the ability of the supplier to provide items that meet or exceed the reliability requirements relies on their understanding of the requirements and operational conditions related to the specific item within the system. It also […]

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How to judge an FMEA study

April 16, 2015
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Thoughts on Judging an FMEA Study It is rare that a third party generated FMEA/FMECA has any value. The development or manufacturing teams and supporting staff should comprise the bulk of the study’s team. Team size for a specific study would include 4 to 10 individuals. The FMEA/FMECA should provide clear action items that may […]

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Uncovering Hidden Field Failure Problems

April 4, 2015
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How to Prevent Customers from Finding Reliability Issues A reliable product does not fail often. Customers expect to a level of reliability performance and failures that occurs too early dash their expectation. The design and development team work to create a robust product. To meet the customer’s reliability expectations. The team may use a range […]

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Reliability Planning to Create a Reliability Product

March 31, 2015
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Reliability Planning A specific reliability plan may include any number of specific tasks. To build an effective plan you need the knowledge of the individual tools and techniques, plus how they may fit together to create an overall plan to achieve your goals. Reliability Goals Of course this start with establishing complete reliability goals that […]

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Purpose of a Reliability Program

March 22, 2015
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Purpose of a Reliability Program The reliable performance of a system is important. It is important to the customer, to our business and to us. Very few argue that we should ignore the reliability characteristics of a product. We also deem cost, time to market or feature set as important also. The trouble is we […]

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Duration and Reliability Goals

March 15, 2015
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Duration Coupled with probability is the duration over which the probability applies. For example, if we desire 99 of 100 to survive, we must state over which period of time this applies. It is proper to state the couple of 99% reliable over 1 year. It is not sufficient to define reliability as ‘5 year […]

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