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Normal Distribution and Z Score

Normal Distribution and Z Score

Normal distribution is one of the foundation concepts in statistics and every quality and reliability professional must understand and able to apply this concept. There are already may videos on this subject, but Hemant Urdhwareshe has tried to make the concept as simple as possible in this video. Hemant has explained the history and basics of normal distribution and its properties. Hemant has further explained the concept of standard normal distribution and how to apply it to solve some typical problems using tables of standard normal distribution. You can download the tables from www.world-class-quality.com.

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Communicating PFAS (Forever Chemicals)

Communicating PFAS (Forever Chemicals)

The United States Conference of Mayors created a PFAS Toolkit. The information and resources included provides insights into several key aspects that local governments and businesses should be aware of in relation to PFAS (forever chemicals). Key parts of the PFAS Toolkit are presented here.

PFOA and PFOS in Drinking Water: Overview

Per- and polyfluoroalkyl substances (PFAS) are a group of chemicals developed in the 1940s that have been used in a variety of consumer products like semiconductors, cellphones, textiles, renewable energy, and medical devices. Two chemicals, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) are no longer produced today, but they were once used in a wide variety of industries. Today, trace levels of PFOA and PFOS can be measured in water, air, soil, animals, humans, and some consumer products globally. PFOA/PFOS are persistent in the environment, and some studies suggest that long-term exposure at increased doses may lead to negative health impacts. [Read more…]

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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

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Too Much Risk Management Can Hurt the Organization

Too Much Risk Management Can Hurt the Organization

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

Organisations that promote formalised and standardised risk management practices can create a risk culture where their employees view risk management as a compliance and tick-the-box exercise.

In comparison, organisations that intentionally promote a more informal environment where risk discussions and information sharing naturally occur as part of the broader organisational culture when making decisions can experience a positive risk culture.

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What Price Kaplan-Meier Reliability?

What Price Kaplan-Meier Reliability?

The Kaplan-Meier estimator is the maximum likelihood, nonparametric reliability estimator for censored, grouped lifetime data. It’s traditional. It’s in statistical software. Greenwood’s variance formula is well known. Could Kaplan-Meier be improved: smaller variance, better actuarial forecasts, seasonality, separate cohort variability from reliability? Could you estimate reliability without life data and preserve privacy?

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Student Questions from My Root Cause Analysis Class, Part 3

Student Questions from My Root Cause Analysis Class, Part 3

In this third and final installment in this series showcasing the most thought-provoking questions I’ve received from students of my online Root Cause Analysis class over the past five years, you will see a question each about the cause-and-effect diagram, capability analysis, and team building. This diverse set of questions, like the questions presented in the first two installments of this series, point plainly to the diversity of skills needed to become an effective quality or reliability professional.

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Reliability Growth

Reliability Growth

Concepts, Strategy, Duane Model and Application Case Study

We are happy to release this video on Reliability Growth which is a very important strategy to assure reliability of new products. In this video, Hemant Urdhwareshe has explained the basic concepts and strategy of reliability growth, the related mathematical relationships, and the Duane Model with an application case study of introduction of new model of Diesel engine. Hemant is a Fellow of ASQ and is ASQ CRE, CMBB, CSSBB, CQE and CMQ/OE. We are sure that viewers will find it useful. If you like the video, do not forget to click the like button.

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Evaluating Equipment Redundancy using RAM Models

Evaluating Equipment Redundancy using RAM Models

The Concept of Equipment Redundancy

Adding equipment redundancy to a system can improve uptime and reliability leading to increased output. When adding new equipment, it is cheaper to evaluate the benefits, or lack of thereof, on paper before implementing the change. Typically done as part of the design phase. However it can also happen after commissioning but its is more expensive. In other words, its better to get it right before “shovels go in the ground”.  

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Why and How to Merge Agile with Waterfall Methodologies

Why and How to Merge Agile with Waterfall Methodologies

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

This article focuses on the task level of a project which is the key to merging the different methodologies. There is a lot of articles on line that explain what the merger will look like and the pros and cons of it but I found nothing to explain HOW TO DO IT?  This article goes into quite a bit of detail but I felt I had no choice to convey to the reader how to merge the two methodologies with examples.

Agile was created for software development projects. Some of the key benefits of this methodology are flexibility, speed, high quality, and continuous improvement. These features are implemented at the Scrum level. One major problem with Agile is that it does not scale up to large projects due to lack of structure, changing requirements and scope, and lack of a baseline to measure project performance.  In my opinion, it works well for small software and IT projects that are less than a year in duration and less than $1M in value

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How ACE 3T Precision for Standard Operating Procedures Was Discovered

How ACE 3T Precision for Standard Operating Procedures Was Discovered

How the 3T’s of Human Error Prevention and Mistake Proofing – Target, Tolerance, Test – were Discovered

Human errors and mistakes cause 80 percent of industrial equipment failures. That humans cause most problems has long been known. It has been difficult to find reliable ways to prevent human error, but an Arab craftsman taught me the 3Ts of error prevention and mistake proofing work.

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Hazard Plotting Approach and Case Study

Hazard Plotting Approach and Case Study

to analyze failure data of shock absorbers

In this video, Hemant Urdhwareshe explains how to use Hazard Plotting to estimate parameters of Weibull Distribution using Excel with an application case study. Hemant also explains related mathematical concepts in Hazard plotting. Hemant is a Fellow of ASQ, and is certified by ASQ as CRE, CMBB, CSSBB, CQE and CMQ/OE. Viewers may like to watch our previous video on Weibull Probability Plotting.

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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!

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