Robustness tools used to do the pre-work of the FMEA

R

ridakalo

#1
Hello All,

I an trying to generate an interface matrix but anywhere I found this tool always the instruction is:

"You need to evaluate negative values"

But How?
How Can I make the evaluation of the matrix?

Should I have to ADD all negatives,????

Please can somebody help me?

Thank you
 

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E

EEJen

#2
Can you add the matrix for review?

Jeannette

Hello All,

I an trying to generate an interface matrix but anywhere I found this tool always the instruction is:

"You need to evaluate negative values"

But How?
How Can I make the evaluation of the matrix?

Should I have to ADD all negatives,????

Please can somebody help me?

Thank you
 

Miner

Forum Moderator
Staff member
Admin
#4
The interface matrix is typically used to prepare for a Design FMEA. All of the interfaces regardless of value should be included in the Design FMEA.

While positive values are good from an engineering perspective, failure modes are still possible. Negative values require additional engineering work to either change them to zero, a positive value, or otherwise overcome. It may require use of tools such as axiomatic design, TRIZ or basic systems engineering.
 

Chennaiite

Never-say-die
Trusted Information Resource
#5
The interface matrix is typically used to prepare for a Design FMEA. All of the interfaces regardless of value should be included in the Design FMEA.

While positive values are good from an engineering perspective, failure modes are still possible. Negative values require additional engineering work to either change them to zero, a positive value, or otherwise overcome. It may require use of tools such as axiomatic design, TRIZ or basic systems engineering.
I wonder as to how negative values could be changed to positive. Example, Exhaust gas should not transfer heat energy to Fuel piping, lets say. The interface matrix will say negative value for energy interface between Fuel Piping system and exhaust system. Now, the designer's responsibility is to ensure that Fuel pipes are located safely away from the exhaust system or the Fuel Pipe material is designed to withstand Heat generated from Exhaust system or so. That doesn't mean that the interface value turns Positive. It's only that some design controls have been ensured by identifying potential failure modes through interface matrix.

For OP, the values in the matrix are not for some arithmetic calculation (since you questioned about 'addition'). Only that, they give some food for thought when it comes to Potential failure mode in the DFMEA Worksheet.
 

Miner

Forum Moderator
Staff member
Admin
#6
I wonder as to how negative values could be changed to positive. Example, Exhaust gas should not transfer heat energy to Fuel piping, lets say. The interface matrix will say negative value for energy interface between Fuel Piping system and exhaust system. Now, the designer's responsibility is to ensure that Fuel pipes are located safely away from the exhaust system or the Fuel Pipe material is designed to withstand Heat generated from Exhaust system or so. That doesn't mean that the interface value turns Positive. It's only that some design controls have been ensured by identifying potential failure modes through interface matrix.
True, not all can be changed to positive, but a -2 (Must be prevented to achieve functionality) must be changed to at least a -1 (Causes negative effects but does not prevent functionality).
 
R

ridakalo

#7
So,, That mean that this matrix doesn´t needs to evaluates, it is used only as a reference to identify the interactions where I need to be focus on depending what we are looking for????

for example I need to be focus on negatives in order to avoid failures and on the other hands I need to be focus on the positive in order to get the functionality that I want to get from the interaction of the components of the systems.

Am I ok?

Thanks,
 

Miner

Forum Moderator
Staff member
Admin
#8
It depends on your definition of the word evaluate.

Evaluate:

  1. To determine or fix the value of.
  2. To determine the significance, worth or condition of usually by careful appraisal and study.
It does not mean the first definition as in a mathematical calculation. However, it does mean the second definition as noted in the previous posts.
 
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