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Home » Archives for Fred Schenkelberg » Page 5

Fred Schenkelberg — Thought Leader

Author of CRE Preparation Notes, Musings", NoMTBF, multiple books & ebooks>, co-host on Speaking of Reliability>/a>, and speaker in the Accendo Reliability Webinar Series.


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

by Fred Schenkelberg 1 Comment

Fundamentals of Hypothesis Testing

Fundamentals of Hypothesis Testing

Fundamentals of Hypothesis Testing

podcast episode with speaker Fred Schenkelberg

Let’s make a comparison. Let’s check our product’s key characteristics against specifications, compare vendor life data, or compare the newest design changes to prior performance. We can and should do comparisons well using the appropriate statistical approach.

Let’s examine a handful of parametric and non-parametric comparison tools, including various hypothesis tests. Plus how to best use these tools and when to set them aside and explore another approach.

[Read more…]

by Fred Schenkelberg Leave a Comment

Join the Linkedin Group

Join the Linkedin Group

The Linkedin NoMTBF group is growing and while not very active does have an occasional interesting discussion. Join the discussion and maybe relate how you have raised awareness around the proper use of MTBF.

https://www.linkedin.com/groups/1857182/

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Metrics

by Fred Schenkelberg Leave a Comment

Culture Still Eats Strategy for Breakfast

Culture Still Eats Strategy for Breakfast

Guest Post by Bill Pomfret (first posted on CERM ® RISK INSIGHTS – reposted here with permission)

It took us years to move from top-down to people-centric management, but the journey was worth it Peter Drucker once said, “Culture eats strategy for breakfast.” Throughout my career, I have spent a lot of time in the strategy room. But no matter what we decided there, until we got the organizational culture right, we were unsuccessful in executing our goals.

[Read more…]

Filed Under: Articles, CERM® Risk Insights, on Risk & Safety Tagged With: Change Management

by Fred Schenkelberg

Arrhenius or Erroneous

Arrhenius or Erroneous

The following is a recent discussion on the sister Linkedin NoMTBF Group. It was and may continue to be a great discussion. Please take a look and comment on where you stand. Do you have some form of the Arrhenius reaction rate equation in your reliability engineering work? Join the discussion here with a comment or on the Linkedin group conversion.

Fred

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Life testing and accelerated life testing (ALT)

by Fred Schenkelberg Leave a Comment

Why HALT is not HALT

Why HALT is not HALT

An excellent short white paper by Craig Hillman that is worth reading. It underscores why I claim HALT is the second worst 4 letter acronym in our profession.

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Highly Accelerated Life Testing (HALT)

by Fred Schenkelberg Leave a Comment

Fundamentals of Process Capability

Fundamentals of Process Capability

Fundamentals of Process Capability

podcast episode with speaker Fred Schenkelberg

Calculating and interpreting the process capability ratios is the easy part. Getting valid results takes more work and thinking. Knowing that the process is capable is only one use of this information. We should also use the information contained in these ratios to inform product design tolerance. [Read more…]

by Fred Schenkelberg 10 Comments

Acceleration Factors

Acceleration Factors

Temperature acceleration factor for ALT planning (question posted to Linkedin Society of Reliability engineers group, 5/7/12

Hello, can anyone advise me how to calculate temperature acceleration factor for a complex system including cards, RF elements, cables, motors and moving parts? Is the Arrhenius model valid for such systems, or there are more precise models? Thank you!

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Life testing and accelerated life testing (ALT)

by Fred Schenkelberg Leave a Comment

System or Component Testing

System or Component Testing

Fred i was asked this question and wanted to know what your thoughts were on this. R and D asked me what was the criteria to decide if to test at a component level or at a system level , my answer was that it should depend on what is the reliability and confidence level of the component
your thoughts?


thanks
sd

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Life testing and accelerated life testing (ALT)

by Fred Schenkelberg 2 Comments

Parts Count Variation

Parts Count Variation

Just a short post to point to a paper on the accuracy of part count prediction techniques. A few years ago, I recalled seeing a paper that studied the difference between various parts count methods and actual results.

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Parts count prediction

by Fred Schenkelberg Leave a Comment

Graphical Analysis of Repair Data

Graphical Analysis of Repair Data

With the kind permission of Wayne Nelson and Robert Abernathy, we are posting an article on the analysis of repair data. As you may know, the assumptions made when using simple time-to-failure analysis of repairable systems may provide misleading results. Using the analysis method outlined by Wayne is one way to avoid those costly mistakes.

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Data analysis

by Fred Schenkelberg Leave a Comment

Fundamentals of Control Charts

Fundamentals of Control Charts

Fundamentals of Control Charts

podcast episode with speaker Fred Schenkelberg

On one of my first vendor visits, they proudly showed us the control charts behind glass near the conference room. They were nicely printed, all in perfect control, and rather odd. A control chart belongs on the production line, where the operators make the measurements. They are of little value when automatically collected and printed out once a month for display-only purposes. [Read more…]

by Fred Schenkelberg Leave a Comment

What Should We Use Instead of MTBF?

What Should We Use Instead of MTBF?

Giving a presentation last week and asked if anyone uses an 85%RH/85°C type test, and a couple indicated they did. I then asked why.

The response was – just because. We have always done it, or it’s a standard, or customers expected it. The most honest response was, ‘I don’t know’.

Why is the test being done? Who is using the information for a decision? What is the value of the test results? If ‘just because’ is the best you can say about a test, why do it?

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Metrics

by Fred Schenkelberg 1 Comment

Use the Right Fit

Use the Right Fit

I’ve often railed on and on about the inappropriate use of MTBF over Reliability. The often cited rationale is, “it is simpler”. And, I agree, making simplifications is often necessary for any engineering analysis.

It goes too far when there isn’t any reason to knowingly simply when the results are misleading, inaccurate or simply wrong. The cost of making a poor decision based on faulty analysis is inexcusable.

[Read more…]

Filed Under: Articles, NoMTBF Tagged With: Regression analysis (Weibull analysis)

by Fred Schenkelberg 1 Comment

The Language We Use Matters

The Language We Use Matters

During RAMS this year, Wayne Nelson made the point that language matters. One specific example was the substitution of ‘convincing’ for ‘statistically significant’ in an effort to clearly convey the ability of a test result to sway the reader. For example ‘the test data clearly demonstrates…’

As reliability professionals let’s say what we mean in a clear and unambiguous manner.

Thus, you may suspect, this topic is related to MTBF.

[Read more…]

Filed Under: Articles, NoMTBF

by Fred Schenkelberg Leave a Comment

Fundamentals of Safety Margins

Fundamentals of Safety Margins

Fundamentals of Safety Margins

podcast episode with speaker Fred Schenkelberg

One way to create a robust product or system is to consider all the stresses and design to withstand those stresses. We often do not know all the stresses, magnitudes, and ranges of variation. We know that many materials degrade with time, yet we do not know precisely how much or how fast. We also do not know what new stresses may arise or how stresses will change over time.

[Read more…]

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