Your Reliability Engineering Professional Development Site
Find all articles across all article series listed in reverse chronological order.
Intuitively, the emphasis in reliability to achieve a reduction in warranty and in-service costs results in some minimal increase in development and manufacturing costs. However, use of the proper techniques during the proper life cycle phase will help to minimize total life cycle cost (LCC).
To minimize total LCC, your organization should do two things:
We make decisions every day. Our project teams and organizations have many individuals making decisions every day. Most of these decisions have little to do with product reliability, yet a surprising number of design, marketing, production, and customer care decisions that have a direct impact on product reliability performance.
As a reliability professional, do you work to make better decisions? Do you work to enable the individuals designing, producing, marketing, etc your organization’s products to make better decisions concerning reliability?
If not, why?
Let’s outline a few ways to estimate the value to you and your organization to improve decision making concerning reliability. [Read more…]
I’ve been told that humor, especially New York sarcasm doesn’t go over too well on LinkedIn. That as a regular contributor of articles, blog postings and hopefully useful updates one should try avoid attempting to use humor as a teaching tool.
Well those who know me well know I also don’t always follow the advice of those who somehow believe we all learn the same way, think the same way and therefore do things the same way. I’m a guy who believes that while common sense might not be that common, when you explain why something makes sense most of the audience will get it. For the others who still don’t understand I of course bring data.
Recognizing the heartbeat of product development will allow organizations to make the most of their resources. Using the right tools, at the right time, will lead to improved designs. This video talks in detail about what the heartbeat is made up of.
A Series of Unfortunate MTBF AssumptionsThe calculation of MTBF results in a larger number if we make a series of MTBF assumptions. We just need more time in the operating hours and fewer failures in the count of failures.
While we really want to understand the reliability performance of field units, we often make a series of small assumptions that impact the accuracy of MTBF estimates.
Here are just a few of these MTBF assumptions that I’ve seen and in some cases nearly all of them with one team. Reliability data has useful information is we gather and treat it well. [Read more…]
Guest Post by John Ayers (first posted on CERM ® RISK INSIGHTS – reposted here with permission)
A defense company I worked for wanted to get into the Sonobuoy business. At the time, one company dominated the market and usually received the largest share of the Navy contract. A couple of other suppliers got the balance of the production quantity to keep it a competitive business.
My company developed a win strategy based on a ¼ scale prototype and purposely under bidding the competition. It worked. They won the largest piece of the production contract. [Read more…]
When in solution (dissolved in water) the molecules of an acid or a base dissociate (disunite) into a mix of component parts and the full molecule. The components are electrically charged + or – ions. Ions are unstable and ‘want’ to bond chemically to become stable. In strong acids and bases many ions are present, making them reactive and dangerous. [Read more…]
This is part of a short series on the common life data distributions.
The Binomial distribution is discrete. This short article focuses on 4 formulas of the Binomial Distribution.
It has the essential formulas that you may find useful when answering specific questions. Knowing a distribution’s set of parameters does provide, along with the right formulas, a quick means to answer a wide range of reliability related questions. [Read more…]
The Plan: Saturday and Sunday was skiing in Vermont with the family, back Sunday night, everyone off to school Monday morning, then to the airport to get to Miami, Tuesday and Wed meetings down there, then fly out Wed night so I’m back to teach classes Thur and Fri here in Boston. Easy Peesie!
Actual: Finish ski trip feel a little “strange” on flight down to Miami, slight chills. Tuesday do meetings just barely, Tuesday night it hits like a freight train, The Flu, or Malaria, Aliens. On Wednesday the freight train had fully passed over me so it stopped and spent Wed backing up over me again. Thursday it went forward again over a pile of human jello. I’m not flying out for the clases on Thur and Fri, or anytime soon for that matter. Just getting home is my mission for the week.
Managing requirements for complex systems can be challenging, however, establishing a hierarchical framework of key questions (answered at each layer of the hierarchy) can be quite helpful.
While some regulatory authorities (such as the FAA) may require various layers of documentation and traceability, this article isn’t necessarily advocating a bureaucratic development process. The process can be scaled based on the complexity of your system, your ability to model it’s (system) design performance and/or based on the amount of product development risk the organization is willing to assume. [Read more…]
How is a manufacturing process determined to be capable of producing parts that meet engineering requirements? Some, like the finish of a gear tooth are critical, while the roughness of a non-contact surface isn’t critical. The critical characteristics need to be identified and checked to determine if the process is capable.
This article defines the analysis concepts and indices.
Process capability assessments (PCA) start during the product development process and continue into series production. Prototype parts are created by a variety of methods, ranging from hand-crafted parts to short term manufacturing in a production intent process under factory conditions. The methods that are closest to series production are the most realistic.
Yet another example of why it’s important to understand the failure modes that make your system vulnerable to complete shutdown. Delta Airlines is learning this lesson the hard way today after having to inform customers around the world that all of its flights would be on hold or even canceled due to a “system wide outage”.
Delta listed the cause for the outage as a power failure near its world-wide office location in Atlanta, Georgia while those at Georgia Power believe it was the failure of Delta’s equipment that caused the power outage.
While each company points the finger at the other, the reality is Delta’s customers around the world are sitting at airports or at home wondering when the problems will be resolved and when Delta will be able to accommodate their travel needs.
There are several reasons why DOE could be used. This video will provide those reasons and provide the support behind it. The reasons are beyond the traditional ideas. [Read more…]
In this article we’ll explore the topic of requirements, and attitudes about identifying requirements before the design work begins.
In my experience, I’ve had design resources literally state “I hope there are no requirements”. (Unconstrained design and no requirements certainly made this designer’s job much easier.)
There are several other reasons requirements are sometimes neglected:
