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Fred Schenkelberg — Thought Leader

Author of <a href="/creprep/">CRE Preparation Notes</a>, <a href="/on-product-reliability/musings">Musings</a>, <a href="/articles/nomtbf/">NoMTBF</a>, <a href="/book-author/fred-schenkelberg/">multiple books & ebooks</a>, co-host on <a href="/series/sor/">Speaking of Reliability</a>, and speaker in the <a href="/series/sor/">Accendo Reliability Webinar Series</a>.


This author's archive lists contributions of articles and episodes.

by Fred Schenkelberg 1 Comment

Successful Reliability Engineers Add Value

Successful Reliability Engineers Add Value

Value is:

the regard that something is held to deserve; the importance, worth,
or usefulness of something. [1]

As a reliability engineer, we work across the organization to bring a reliable product to market. The value of meeting the customer’s reliability expectations results in customer satisfactions, increased sales, and in some cases premium pricing.

We want a reliable product.

[Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: value

by Fred Schenkelberg 2 Comments

Mann-Whitney U Test

Mann-Whitney U Test

The U test permits the comparison of two samples to determine if they came from the same population or not. This non-parametric test can use ordinal data, meaning it is in some rank order without containing information about relative distances between ranks. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Probability and Statistics for Reliability Tagged With: Non-parametric statistical methods

by Fred Schenkelberg Leave a Comment

Networked and Positive as a Reliability Engineer

Networked and Positive as a Reliability Engineer

Many elements help make a reliability engineer successful.Two such elements are knowing the right people to get the job done and generally being a positive and enjoyable person to be around.

[Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: professional development

by Fred Schenkelberg Leave a Comment

Laplace’s Trend Test

Laplace’s Trend Test

A test to determine if the homogeneous Poisson model (HPP) is applicable given the data from an individual system is subject to the non-homogeneous Poisson model (NHPP).

This is an alternative test to using the Kendall-Mann Reverse Arrangement Test. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Probability and Statistics for Reliability Tagged With: Poisson process models

by Fred Schenkelberg 1 Comment

Talent and Professionalism as a Reliability Engineer

Talent and Professionalism as a Reliability Engineer

My dictionary says that talented is “having a natural aptitude or skill for something.”

We learn reliability engineering and those who understand the range of tools and techniques useful for a given situation would be considered talented.

Everything is not solved by running a highly accelerated life test (HALT) or only conducting detailed failure analysis. Knowing when and why to apply a particular tool and using the tool effectively (i.e., when to use a Weibull distribution to model lifetime data and how to use the information to make decisions) are critical. [Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: professional development

by Fred Schenkelberg Leave a Comment

Failure Modes and Mechanisms

Failure Modes and Mechanisms

When something fails, what should we do?

A natural question when something fails is

Why did it fail?

The answer is not always obvious or easy to sort out.

One of my favorite examples was on a circuit board that had a small burn mark where a component exploded off the board. The customer didn’t notice that missing part, our engineering team did that. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Probability and Statistics for Reliability, Reliability Management Tagged With: Discrete and continuous probability distributions, Reliability Terminology

by Fred Schenkelberg Leave a Comment

Success as a Reliability Engineer

Success as a Reliability Engineer

Whether by design or by accident some of us become reliability engineers. Making a career in reliability engineering relies on your ability to make a difference and to add value. Being successful as a reliability engineer, while creating reliable products, permits continuation and growth as a reliability professional.

[Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: professional development, value

by Fred Schenkelberg Leave a Comment

Why Wait for Field Returns?

Why Wait for Field Returns?

In an ideal world, our products and equipment will just work. They would not fail and would not require warranty claims, product returns, or repair.

Unfortunately, we make design mistakes, assembly errors, incur damage, or simply fail. The desired balance for most businesses is the cost of returns will not outweigh the profit of sales.

[Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: field returns

by Fred Schenkelberg Leave a Comment

3 Steps NRTL Use for Product Safety

3 Steps NRTL Use for Product Safety

With any product development, there is a risk the features (benefit) come along with inherent dangers (risk). For example, a desktop computer includes the need for electrical power. Done improperly a person exposed to wall current and voltage could be seriously harmed. While unlikely the risk exists. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Management Tagged With: Safety System

by Fred Schenkelberg 2 Comments

Reliability Growth Testing

Reliability Growth Testing

One approach for reliability improvement is to find the weaknesses or faults, then fix them.

This is best done before shipping to the customer.

You may hear this called the Test, Analyze, and Fix Method (TAAF). Or, you may have heard of it called a Reliability Growth Test program (RGT). Either way, the essence is evaluating prototypes to find specific faults. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Testing Tagged With: Reliability Growth Testing

by Fred Schenkelberg 2 Comments

How to Spot Reliability-Minded Coworkers

How to Spot Reliability-Minded Coworkers

Being the reliability engineer on a project doesn’t have to be a lonely assignment.

Nearly everyone on the team shares the same goal. That of creating a reliable product or maintaining equipment availability.

Other may be electrical or mechanical engineers, technicians, procurement or some other part of the organization, yet they all have something to contribute to improving reliability.

Sometimes you have to find the reliability-minded individuals – to assist when gathering information – to identify potential weaknesses – to provide support for a reliability task – to encourage others to fully consider reliability with each decision [Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: team

by Fred Schenkelberg 1 Comment

Discovery Testing

Discovery Testing

Testing a new design is expensive and takes time to accomplish. During the design, process engineers make assumptions across many decisions. Unknown interactions and unanticipated events may lead to product failure.

Finding design weaknesses early in the design process permits the team to address and correct problems. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Testing Tagged With: Discovery Testing

by Fred Schenkelberg Leave a Comment

Creating Reliability Champions

Creating Reliability Champions

How do you find, encourage and develop reliability professionals across your organization? We all face the challenge of creating a culture of reliability within an organization at some point in our careers.

Do so alone is nearly impossible.

You need support. You need more hands and minds that can spot reliability opportunities. You need to be in dozens of conversations per hour across the organization.

This is difficult for one person to accomplish.

[Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: team

by Fred Schenkelberg Leave a Comment

Hypothesis Test Selection Flowchart

Hypothesis Test Selection Flowchart

This might be easier to read printed out.

[Read more…]

Filed Under: Articles, CRE Preparation Notes, Probability and Statistics for Reliability Tagged With: Hypothesis Testing (parametric and non-parametric)

by Fred Schenkelberg Leave a Comment

14 Ways to Acquire Reliability Engineering Knowledge

14 Ways to Acquire Reliability Engineering Knowledge

Maria Popova recently wrote about the work of James T. Mangan and his book You Can Do Anything!, published in 1936. In particular she focused on one section titled 14 Ways to Acquire Knowledge

The article is about learning anything, which had me thinking about how to learn reliability engineering. So, without apology let’s explore 14 ways to learn about reliability engineering. [Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: career

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