I understand that the RPN numbers are obtained by multiplying S x O x D. Is the multiplication rule in effect because we are assuming that the three rated...
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Sam Lazzara
sam@...
Jul 5, 2006 8:32 am
Dear Ram, I realize that most people multiply, but I have found that addition works better since most engineers (including myself) cannot multiply very well ...
Hi All, I'm new to this group and want to start with the following question: Is it a good idea to implement fmea for software development? At which point will...
In automotive industry, there is no reference to Software FMEA neither in QS9000 nor in VDA4.2. It is typically not required (sometimes also not recommended)...
Hi, Sorry it is typical in use at the automobile industry for software. I know some companies that use FMEA for Unit Control Software as standard development...
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Aaron Chamberlain
aaron.cham@...
Jul 24, 2006 2:31 pm
Actually, you do multiply when doing an FMEA in the automotive industry. S is the severity index (on a scale from 1 to 10), which is the relative severity of...
Sam, Thank you for your response and I can follow how your method will work well. I see the multiplication approach in most every write up I come across. I was...
I agree that Software may be considered during the System-FMAE which itself is not a Software-FMEA since it also includes other system elements (electronics,...
Hello, As Mr. Ivan wants to know if there are any FMEA softwares we are pleased to inform you that we have developed a FMEA basd software that is for the...
We are following the same method (multiplication of S, D & O for calculating RPN). However, while prioritizing the failure modes to be addressed, failure modes...
Sam, Ram, Yes the motor industry uses multiplication. When I did my FMEA training with a major motor manufacturer in the 80,s, one of the reasons given was...
I would like to know the reason for addition working 'better.' 1+1+1=3 1x1x1=1 As for most engineers not being able to multply, then how on earth did they get...
Gerry, Sam, I was able to establish from reliable sources that multiplication of SxOxD is correct because they are the three actors that affect or are affected...
... x D. ... the three rated events S, O and D are independent of each other? ... probability as well? ... While I am most familiar with the multiplication...
Dear Alan, Your last statement refers to RPN being 0 as the lowest and 1000 as the highest. I presume that "0" is a typo and should be "1" instead? Regards, ...
Dear Joanne, That is my point also! There has to be a consistent, "mathematical" approach to calculating the PRNs in FMEA. In the particular instance where the...
Hi, Is that wrong to use PFMEA on the existing manufacturing process? Thanks....
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eric-sl_phoon@...
Aug 5, 2006 8:31 pm
FMEA is a living document and reviewing the FMEA document will improve the process. So it is not wrong to use PFMEA on the existing process, and in fact it...
I also agree with the importance of a high "S" value on its own. In my experience a S value of 10 was reserved for safety issues only and any potential failure...
Not at all. I suspect that most PFMEA's are performed on existing processes as part of an overall process improvement or poke-yoke activity. Works equally well...
Hi all, We did the ISO TS audit and one of the non conformity is the ranking of the evaluation. In the Column "Current control" (for Detection) we can put...
Hi, While conducting a FMEA session, if different participants select different severity rankings, how do you decide on the "final" severity ranking? For eg....
Hello, Is is normal that you can have long discussions about the correct severity ranking. Most of the discussions are not about the higher rankings 9, 10 and...
Dear Robert, Your approach seems to be an acceptable way of resolving the issue of differing rankings. Another approach we have used rather successfully is to:...
I had adopted a system of clearly displaying the factors affecting severity, e.g. 1. Impared performance 2. loss of function, but system will run ... 5....
Hello, I fully agree with your comment not to average the figures and go for the worst case scenario. Importend is that we make clear rules, which are...
hi, I am new to these arguments. in these days I have tried to create fmea of an electronic circuit. Now I would want to add the data in order to obtain a...
Dear friends 1) Please help me in finding FMEA Examples from Telecommunication Service Provider Industry 2) Can you please suggest links where I can find...
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Twincy Nirmala
ntwincy@...
Nov 1, 2006 3:23 pm
Hi everyone, I am been assigned to do a Design FMEA of a pneumatic system used in Aircarfts. It has different levels of components . Main assembly Sub Assembly...
