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You are here: Home / Archives for Fred Schenkelberg

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 Leave a Comment

Creating Meaningful Reliability Predictions

Creating Meaningful Reliability Predictions

Creating Meaningful Reliability Predictions

Early and often during product development, the team needs to know the expected reliability performance of the current design. The values provide information to make decisions.

We can create meaningful estimates. Or not.

ᐅ Play Episode

by Fred Schenkelberg 4 Comments

How to Read an OC curve

How to Read an OC curve

The operating characteristic curve, OC curve, visualizes a sampling plan.

At times, we select a sample from a group of items and evaluate them. Does this lot of widgets meet the specifications? Does this batch measure up? [Read more…]

Filed Under: Articles, CRE Preparation Notes, Probability and Statistics for Reliability, Reliability Testing Tagged With: Sample size

by Fred Schenkelberg Leave a Comment

Three Elements of Sample Size Concerning Decision Making

Three Elements of Sample Size Concerning Decision Making

The trite answer is just as many samples as you need and not one more.

A better answer is enough samples to make the right decision. The realistic answer is you will not enough samples.

“How many samples?” is an oft-asked question when planning for quality or reliability testing. [Read more…]

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

by Fred Schenkelberg Leave a Comment

Management Role Concerning Safety, Quality, and Reliability

Management Role Concerning Safety, Quality, and Reliability

Every product and process has built into it elements that impact the safety, quality and reliability performance.

These features will always be present whether deliberately crafted or not. [Read more…]

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

by Fred Schenkelberg Leave a Comment

Announcing Reliability.fm: A Podcast Network

Announcing Reliability.fm:  A Podcast Network

A break from the normal format.

Reliability.fm

A Reliability Engineering Podcast Network

Reliability.fm.logo_300x300Reliability.fm is a podcast network focused on reliability engineering topics.

Starting with three shows. Speaking of Reliability and Dare to Know described below, along with recorded Accendo Reliability webinars. [Read more…]

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

by Fred Schenkelberg 5 Comments

Reliability and the Development Phase Gate Process

Reliability and the Development Phase Gate Process

My first major product design review was much less than I thought it would be. This was a new inkjet printer platform and the checkpoint review assessed the teams work and readiness to move to the next stage of development. A team of over 200 engineers and managers meet for 4 hours. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Management

by Fred Schenkelberg 2 Comments

Use a Delta Program to Minimize Early Field Failures

Use a Delta Program to Minimize Early Field Failures

Failures happen. Sometimes product failures happen quickly.

You just bought a new feature rich computer and discover it doesn’t work. Right out of the box, it will not power up. Conversations with the tech support and it’s a trip back to the store.

The failures that occur early the in the life of a product tend —

this ‘tend’ really is just a vague ‘in general’

…tend to occur because of manufacturing errors or shipping/installation damage.

Not always, though. [Read more…]

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

by Fred Schenkelberg 1 Comment

Standby Redundancy, Equal Failure Rates, Imperfect Switching

Standby Redundancy, Equal Failure Rates, Imperfect Switching

First off, switches are not perfect, so this situation includes the reliability of the switch. Switch reliability may be a factor of storage time, probability of actually working when called on to work, or number of switching cycles. Each switch technology may be slightly different. For this equation, you need the reliability or probability of success given the primary unit has failed. Although we are assume the switch reliability is independent of the primary unit reliability and subsequent failure.
[Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Modeling and Predictions Tagged With: Reliability Block Diagram (RBD)

by Fred Schenkelberg Leave a Comment

Asking a Vendor for Reliability Data

Asking a Vendor for Reliability Data

Asking a Vendor for Reliability Data

Selecting as a supplier for components or subsystems involves 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 relies on the supplier’s knowledge of their own design and manufacturing processes as it relates to reliability performance.

ᐅ Play Episode

by Fred Schenkelberg 4 Comments

Tolerance Intervals for Normal Distribution Based Set of Data

Tolerance Intervals for Normal Distribution Based Set of Data

This is not the same as a confidence interval. For a mean or standard deviation, we can calculate the likelihood that the true parameter is within a range of values — confidence interval concerning a parameter.

A tolerance interval applies to the individual readings, not the statistics. The interval contains a certain proportion of the values within the distribution of individual data points. The endpoints are tolerance limits. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability in Design and Development Tagged With: Tolerance analysis

by Fred Schenkelberg 2 Comments

Reliability Benefits of Alpha and Beta Testing

Reliability Benefits of Alpha and Beta Testing

Your customers are your best testers for your next product. They will explore the features. Expose the product to use conditions in unconscious ways. And, they will let you what they consider failures without needing the specification document.

During the development process, you and team may work to understand what customer may want or expect for the new product. You may even conduct focus groups or review past product field failures and call center records. [Read more…]

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

by Fred Schenkelberg 13 Comments

Standby Redundancy with Equal Failure Rates and Perfect Switching

Standby Redundancy with Equal Failure Rates and Perfect Switching

First off, switches are not perfect, so this situation is hypothetical. Yet, when you are exploring adding standby redundancy and haven’t sorted out the switching mechanism, you may be purely curious about the benefits of the redundancy. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Reliability Modeling and Predictions Tagged With: Reliability Block Diagram (RBD)

by Fred Schenkelberg 2 Comments

Mechanical Systems Reliability Testing

Mechanical Systems Reliability Testing

Mechanical systems wear out and fail eventually. The ability of a structure to support a load, move through the specified range of motion, or spin degrades with use and time. Even our joints eventually wear out.

Accelerated life testing (ALT) has plenty of literature concerning the failure mechanisms unique to electronic components and materials. This is partially due to the limited number of unique electronic components compared to the often custom mechanical designs. ALT also has value as it provides information about a system’s reliability performance in the future.

Let’s explore an example of mechanical reliability testing (an ALT)  in order to outline a basic approach to ALT design and analysis. [Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics, on Product Reliability Tagged With: Life testing and accelerated life testing (ALT)

by Fred Schenkelberg 3 Comments

Interpolation within Distribution Tables

Interpolation within Distribution Tables

EDITED BY JOHN HEALY

Most statistics books and the CRE Primer have tables that permit you to avoid calculating the probability for common distributions. The normal distribution requires numerical methods to conduct the calculations and would not be feasible during the CRE exam. [Read more…]

Filed Under: Articles, CRE Preparation Notes, Probability and Statistics for Reliability Tagged With: Statistics distributions and functions

by Fred Schenkelberg Leave a Comment

Life Estimates Based on Supplier Data

Life Estimates Based on Supplier Data

Suppliers often include reliability information along with performance specifications.

We look for reliability statements as one part of the selection process to ascertain if the component is likely to have sufficient reliability.

When the vendor’s data is clearly stated and meaningful, that information saves us from potentially having to conduct our own reliability evaluations. [Read more…]

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

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