Your Reliability Engineering Professional Development Site
Find all articles across all article series listed in reverse chronological order.
Last time we discussed Alarms in the Opportunities for Maintenance and Reliability series. This week we will be discussing event rates. What is an event rate? Watch George break it down!
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Concurrent or simultaneous failures can happen with redundant or spared systems. This means that both spared equipment can fail at the same time leaving the operator with no production output. For example, we have two alternating pumps operating in a parallel configuration. Each one acts as a spare and at any one time can take over if the other one fails. This article is based on a question I was asked during a recent industry presentation. I thought the example was interesting and informative enough to share with the Maintenance and Reliability community.
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Let’s say we have a set of numbers, {2.3, 4.2, 7.1, 7.6, 8.2, 8.4, 8.7, 8.9, 9.0, 9.1} and that is all we have at the moment.
How many ways could you analyze this set of numbers? We could plot it a few different ways, from a dot plot, stem-and-leaf plot, histogram, probability density plot, and probably a few other ways as well. We could calculate a few statistics about the dataset, such as mean, median, standard deviation, skewness, kurtosis, and so on. [Read more…]
A short introduction to accelerated life testing or ALT. It is a method used to enhance product reliability by subjecting prototypes to stress levels significantly higher than those encountered in actual use. The idea is to rapidly induce failures which is equivalent to speeding up time.
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The world needs plant and equipment that are reliable and fault-free for decades. Yet Maintenance can only keep machinery working by replacing broken and at risk parts. Even industrial asset management only aims to lower the cost of plant and equipment ownership. Neither methodology has the capability to deliver what mankind needs in future. Before the end of this century both disciplines will die-out because intelligent production machines will be made that are completely reliable and maintenance-free for their entire lifetimes.
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Effective leaders provide their employees with a heartfelt portrayal of the WHY, a deep-rooted purpose, before defining the WHAT, the product or service, and then finally, the freedom on the HOW, which is the process.
First, understand the WHY of your solution. This gives you the line of thinking needed to decide HOW you can provide this solution in a way that is better than your competitors and more efficient for your customer.
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This is the second part of our two videos on Weibull Distribution. In this video, Hemant Urdhwareshe discusses few more concepts of Weibull Distribution, such as characteristic life, three-parameter Weibull and B10 life for Weibull Distribution. The concepts are explained with an application case study to calculate reliability using the Weibull Reliability function. The video would be useful to all those who want to learn applicability of Weibull Distribution to estimate reliability and to those who wish to take ASQ CRE, CQE, Six Sigma Black Belt and CMBB certification exams. In Weibull Distribution Part-1, Hemant had explained various basic concepts in Weibull Distribution with brief discussion on mathematical relationships.
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In this video, we use RCM principles to decide if I should accept the consequences of failure or visit the dentist to eliminate the Failure Mode.
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In this episode, we will demonstrate a free tool that can be used to help with bad actor analysis. ITUS Digital offers a free (limited version) tool to help get started with determining opportunities for equipment improvement. www.assetriskanalyzer.com
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Technically trained professionals often get wrapped up in things like visualization, which distracts us from our mission. Our mission is to provide information to decision makers, and technical professionals are trusted advisors. So, most of our graphics, visuals, and videos should be informational. The I in FINESSE stands for Illustrate. Illustrate includes all the visuals, graphics, videos, and other media used in technical reports and presentations. These three tips and a short video provide focused examples.
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As regular readers know, MTBF by itself is misleading. It can also be deceptive when representing actual data. Just because you have a high MTBF value doesn’t mean it is reliable.
In a previous article, 10 Reasons to Avoid MTBF, I mentioned that it is possible to have a relatively high MTBF value when the actual reliability is low. Ashley sent me the following note:
Hi Fred, i love reading your articles they are very informative. I have a question about something you said in a comment which i am hoping you will be able to clarify for me. You said products with higher MTBF can actually be less reliable than products with a lower MTBF
I have tried to find information on how this is possible online, and tried to do the maths myself to make this happen but i have to admit i am struggling.
No worries, Ashley, let’s work out an example to illustrate what I meant. [Read more…]
Anybody who did some hardware test in they life, eventually will face the question of sample size.
Probably it will be a tradeoff between the test duration and amount of samples to test.
So how much is enough? One, three, ten?
Equipment and machinery reliability grows as machines are made more accurately and components kept in more perfect condition. Finesse and refinement practised on equipment parts extends equipment life by months, sometimes many months. Once you reach superb precision and work quality control your reliability growth bounds forward by years at a time. Conversely, when assembly accuracy is poor or parts’ environments are degraded you lose reliability at a rate of years at a time. In fact, the rate at which you lose reliability when component health is lost is as if you threw your machine from a cliff. Many industrial companies blindly commit industrial suicide daily by leaping off ‘reliability cliffs’.
“Time and tide wait for no man”. King Canute demonstrated that the ebb and flow of the tide are inevitable and even a king has no control over them. Time, perhaps our most precious resource, is also no exception. Who hasn’t regretted not doing something because there wasn’t enough time, or time ran out as we wasted too much time deciding to do something and the opportunity slipped through our fingers?
On the other hand, how often do we regret having made a hurried decision and have had to live with dire consequences which, in hindsight could well have been avoided if we’d had more time or rather, made better use of the time available.
[Read more…]It isn’t about the words you say. It’s about the energetic message you send. Pete Carroll [Read more…]
