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by Dianna Deeney Leave a Comment

QDD 078 What do We do with FMEA Early in Design Concept?

What do We do with FMEA Early in Design Concept?

I’ve mentioned in previous episodes that it’s best to do FMEA early in the design concept phases of development.

Well, if we do FMEA early, then what can with do with it?

We explore a bit how to study any risk analyses (system risks, FMEA, hazard analysis) to help design-out problems, set-up design inputs, and help us figure out test methods. We also talk a bit about why a team is a necessary part of risk analyses.

 

View the Episode Transcript

Our risk analysis with our team is like a thought experiment about our product, design, or its use. We don’t want to just shelve it – we want to use the results of it to help us make decisions!

Here are just a few of the design decisions that can be made with a risk analysis done early for a concept design:

  • Re-design – Eliminate causes and their failures by changing the design, preventing it from happening in the first place. Do we understand the root cause, or do we need to do further analysis? Do we change the design to reduce the chance of failure/causes? Or can we change the design to be able to detect causes before the failure happens?
  • Design inputs – Use the results to help define design requirements and other design inputs.
  • Test Methods – Design testing to be able to confirm the failure/cause combination, or to explore what else causes the failures. Test to check the occurrence rates of important items against the team’s estimation.

We also talk about the benefits of using a team with varied backgrounds, experience, and knowledge.

 

Citations:

If you like this episode, here are other episodes with related topics:

Use FMEA to Design for In-Process Testing

Use FMEA to Choose Critical Design Features

Choosing a Confidence Level for Test using FMEA

 

Episode Transcript

So we’ve reached the end of a preliminary FMEA or hazard analysis. We worked with our team. We developed a list of risks or failure modes, and we rated it with severity, occurrence and maybe detection, too. What do we do with this now? Let’s talk more about it after this brief introduction. Hello and welcome to Quality during Design, the place to use quality thinking to create products, others love for less. My name is Dianna. I’m a senior level quality, professional, and engineer with over 20 years of experience in manufacturing and design. Listen in and then join the conversation at qualityduringdesign.com.

We did a thought experiment with our team, talking about potential stuff that could go wrong, potential failure modes, potential risks besides being in a negative space, this is also a very useful exercise for a team to do. But now that we have it, what do we do with it? We have severity ratings that our team agreed to, and we have occurrence ratings that are based on qualitative data or our best guesses. Maybe we look to other programs or other projects and what was the occurrence or failure rate in those product designs? Or we, we may actually have some field data and complaint information from competitive products. We may have also gotten our users involved in generating all of this, but now that we have it, what do we do with it? Well, now we need to step back and study it. We can think of this as a starting point to explore the product design more, to learn more about it and change it if we need to.

Let’s step back and study this FMEA or risk analysis and look at what’s important. What has a high severity, meaning that it’s really bad if it happens. What has a high detection rating, meaning we can’t detect it at all, and what seems to happen a lot. What has a high occurrence rating?

The first thing to think about is the prevention controls. What can we do to prevent this from happening? If we do this risk analysis early in concept development, we might have some pretty obvious answers. There could be redesigns to our product that we could do to change the cause or eliminate a failure mode, or even change the design to be able to detect it and improve the detection rating. We want to look first to how we can prevent causes and failure modes from happening. We can even look at things like, Do we understand the root cause of this problem? Or do we need to explore this more in a lower level FMEA or another analysis? And what keeps getting repeated? What cause keeps getting repeated to lead to different failure modes? These are all things that we can look at for prevention controls, changes to our design that we can make to just get rid of these problems. Our prevention can also be a requirement for our design. We could be developing our design inputs.

If you have more problems than you can realistically handle, then that’s where you can start ranking them in order either by picking the highest severity, making sure all the high occurrence ratings are down, and the detection ratings are at least a five, for example. And you can prioritize stains based off that risk priority number, which is the product of the severity, occurrence and detection. These are just ways for your team to prioritize it, but it still needs to be explored within the context of the whole analysis and the whole product.

Looking at the big picture will also tell us what to test. We want to look at the failure mode and the cause combination. Does this cause really create this failure mode, or what else causes this failure mode? We can also look to test to bolster or get more specific about our occurrence rating. How often do we think this failure mode could happen because of this cause? Using an FMEA or risk analysis, we can get more specific about what it is we want to get out of a test, and that helps us with test design. Again, we’re exploring the product design more to learn more about it and change it if we need to. We have these team based risk analyses and we have actual testing that we can do, and our risk analyses can inform us with what kind of tests need to be performed.

Now, what about those things that aren’t important? What if they really are important? If we learn something new through our testing or through subsequent iterations of our design, we’re going to analyze it. We need to put it back into our risk analysis and meet with our team and have a discussion about it. And this is also why we use the team of people when we’re creating risk analysis. We’re casting a net over people with different backgrounds, experiences, and knowledge to analyze and discuss our product design, our system, our user’s process. This is what helps us capture the things that are important versus what’s not important. We need to give our teammates space to be honest about their input. We want to get team consensus, and we don’t want anybody to be bullied into group think.

What’s today’s insight to action? Those risk analyses that we do with our team, the FMEAs and the hazard analyses: these are ways that we can use as a starting off or kicking off point toward other design activities. We don’t want to do the analysis and just put it on a shelf. We want to step back and take a look at the big picture so we can make design decisions.

So, a preliminary FMEA is just that: it’s preliminary. It’s a starting point for our team to take the next step to decide what needs to be redesigned, what feature needs to be eliminated, what new feature we might need, and what do we want to test, how do we want to test it, and what do we wanna get out of it? We need to take these risk analyses past just doing them and getting them done to using them for design.

If you like the content in this episode, visit quality during design.com where you can subscribe to the weekly newsletter to keep in touch. This has been a production of Deeney Enterprises. Thanks for listening.

 

Filed Under: Quality during Design

About Dianna Deeney

Dianna is a senior-level Quality Professional and an experienced engineer. She has worked over 20 years in product manufacturing and design and is active in learning about the latest techniques in business.

Dianna promotes strategic use of quality tools and techniques throughout the design process.

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Tips for using quality tools and methods to help you design products others love, for less.


by Dianna Deeney
Quality during Design,
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