Your Reliability Engineering Professional Development Site
Find all articles across all article series listed in reverse chronological order.
MTBF for electronics life entitlement measurements is a meaningless term. It says nothing about the distribution of failures or the cause of failures and is only valid for a constant failure rate, which almost never occurs in the real world. It is a term that should be eliminated along with reliability predictions of electronics systems with no moving parts. [Read more…]
In 1968 NASA explored where machines and humans would best achieve tasks primarily during space missions. Many of the findings are true today, and in some areas, the differences are blurring.
Machines created by humans continue to improve and take on complex tasks, that once only humans could do. For example, parking a car, now a feature of newer car models. Autonomous driving is happening and continuing to improve. The ability to reason, to foresee and evaluate risks, once thought to be strictly in the domain of human capability is now being done by machines. [Read more…]
A Question & Answer Period with Fred Schenkelberg on the what can be done to improve the reliability of your operation.
So far in this series, we have had the opportunity to discuss the role of reliability engineering in today’s maintenance environments. In this final post of the series, I (James) had the opportunity to ask Fred Schenkelberg some questions related to this very topic. Fred, with his years of experience, was able to provide some great insights to the role of reliability engineering, and what those in the maintenance department can do to improve reliability. [Read more…]
Lately, I’ve seen some evidence of reliability engineers giving up.
Throwing in the towel. Going with the flow. Not rocking the boat.
Is that our charter? To roll over and accept that we cannot make a difference?
No, it’s not. [Read more…]
Just back from a trip to Patagonia and catching up with emails and writing this morning. Posting an article for this list is due today along with a touch of travel weariness, decided to share a part of a question received concerning data analysis.
My thought is to post an actual question one of our peers is facing, and meet the deadline for this post. [Read more…]
Does your team procure, setup and put into operation equipment with a single focus on reducing the initial capital expenditure?
Do you work with your equipment suppliers to fully specify the equipment’s functions, performance, and reliability? Maybe not the reliability? [Read more…]
Or, how to master the body of knowledge and be an effective reliability engineer.
Yes, there is a lot to know concerning reliability engineering. You should have a firm grasp of statistics, modeling, laboratory and experimental procedures, failure analysis skills, and more. [Read more…]
“When the number of factors coming into play in a phenomenological complex is too large, scientific method in most cases fails. One need only think of the weather, in which case the prediction even for a few days ahead is impossible.” ― Albert Einstein
“Prediction is very difficult, especially about the future.” – Niels Bohr* We have always had a quest to reduce future uncertainties and know what is going to happen to us, how long we will live, and what may impact our lives. Horoscopes, Tarot
With the design FMEA complete, the equipment should have high inherent reliability. The equipment can then be installed in the plant, and provide a high level of performance to the business, at least initially. This is where Maintenance comes in. Maintenance can enable a low Life Cycle Cost, by preserving the reliability of the equipment. [Read more…]
If a human is going to build, install, monitor, use, operate, repair, or dismantle, then the design team must consider human factors.
According to Wikipedia
Ergonomics (or human factors) is the scientific discipline concerned with the understanding of interactions among humans and other elements of a system, and the profession that applies theory, principles, data and methods to design in order to optimize human well-being and overall system performance.
You may have been tapped one morning and given the assignment. You may have pursued the role either via a university program or by simply applying for the position.
Now what? How do you start in this role? What are you expected to do? [Read more…]
Products and equipment start with a design. The functions and performance occur or do not occur according to the capabilities designed into the system.
I learned early in my career, as a manufacturing engineer, that some products were much easier to manufacture (less yield loss) than others, and it was often the design of the product that made the difference. [Read more…]
Maintaining high reliability or availability is a marked advantage for any system. A system that achieves the ability to avoid system downtime due to a single failure event, is essential in many applications. Yet, the fault tolerant capability comes at a price.
A system that achieves the ability to avoid system downtime due to a single failure event, is essential in many applications. Yet, the fault tolerant capability comes at a price.
Here is a short list and brief description of fault tolerant design disadvantages:
The nature of a fault tolerance design is to continue to operate normally even with a component failure.
Thus if the ability to detect a component failure relies on a loss of function or capability, it may be difficult to detect the failure. This sets the stage for a second component failure to cause a system downing event. [Read more…]
A common and poor technique to gather field data is to count the number of returns by week or month. This can provide a graph showing the number of returns over time.
It hides information you need to understand your field failures.
Let’s take a look at a way to gather the same field failure data and retain the critical information necessary for time to failure analysis. [Read more…]
Implementing a new reliability development paradigm in a company which is using traditional, standards-based testing can be a perilous journey.
It is especially true with introducing HALT (Highly Accelerated Life Test) in which strength against stress, and not quantifying electronics lifetimes is the new metric. Because of this significant change in test orientation, a critical factor for success begins with educating the company’s top [Read more…]
