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Show existing measures of potential failures in FMEA table

medini_1024169437

Jiawei recently asked a question regarding extra columns in the FMEA table.

Jiawei, please describe what you are seeking for.

Happy Scripting

Jan

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medini_1025559273

Dear Jan,

The potential failure in FMEA table also can link with some measures/ safety machenisms,

which I want to make these visible in the FMEA table also.

Could you help to provide a script to profilling a new column to derive measures of the potential failures in FMEA?

medini_1024169437

Hi Jiawei,

just to understand, have you already disabled the option "Hide measure groups" in FMEA front page

and checked the new columns appearing in the table?

Isn't hat what you are looking for?

Jan

medini_1025559273

Hi, Jan,

in the standard FMEA, the measure group is aimed to failure causes, but this measure group is not my need.

I am looking for the measure linked with the potential failure of FMEA:

the potential failure of current FMEA may be failure cause in the upper level FMEA, that there may be measures derived.

am I clear?

medini_1024169437

Crystal clear now :-)

Jan

medini_1025559273

Dear Jan,

Is there any progress for this topic?

medini_1024169437

Sorry Jiawei,

I totally forgot to post the answer. Well, I think that should be very simple.

Just add a derived property to "Failure Entry" and the script should look like:

self.element.allSafetyMechanisms

That adds a column to the failure:

Note that the script should be the same for OCL and JS.

Jan

medini_1025559273

Dear Jan,

Do you mean "Failure(derived FMEA only)"? because I did not find a "Failure Entry" in FMEA Worksheet.

In my added column, nothing showed:

medini_1024169437

Yes, I meant this type ("Failure(derived FMEA only)").

Hm, maybe I missed the point. Let me check... I'll come back soon.

Jan

medini_1024169437

Well, I mixed FMEA and FMEDA, sorry. So that should be then:

self.element.oclAsType(safetyModel::FailureMode).measureGroups.detectionMeasures

Note that I used OCL here because now its much easier to access list of lists.

Jan

medini_1025559273

Can I show both detectionMeasures and preventionMeasures together?

medini_1024169437

For that purpose, OCL has a nice "union" function to combine two collections, so please try:

self.element.oclAsType(safetyModel::FailureMode).measureGroups.detectionMeasures->union(
	self.element.oclAsType(safetyModel::FailureMode).measureGroups.preventionMeasures)

Happy Scripting

Jan

medini_1025559273

Hi, Jan,

sometimes the potential failure is a "FailureMode", and sometimes it is a "Malfunction".

How to update the script to show both's Measures?

"Union" function seems not work in this situation:

self.element.oclAsType(safetyModel::FailureMode).measureGroups.preventionMeasures->union(
self.element.oclAsType(safetyModel::FailureMode).measureGroups.detectionMeasures)->union(
self.element.oclAsType(safetyModel::Malfunction).measureGroups.preventionMeasures)->union(
self.element.oclAsType(safetyModel::Malfunction).measureGroups.detectionMeasures)

medini_1025559273

Hello, Jan,

Is it because of (Failure Mode & Malfunction) are two different element types?

Should "if else" be used in the script?

medini_1024169437

Hi Jiawei,

yes, its because they are of different type. Luckily they have the same base class AND the "measureGroup" is defined there, not in FailureMode.

So please rewrite to:

self.element.oclAsType(safetyModel::Failure).measureGroups.detectionMeasures->union(
 self.element.oclAsType(safetyModel::Failure).measureGroups.preventionMeasures)

Jan

medini_1025559273

Hi, Jan,

Thank you for your nice scripts, it works!

I think I need to be more faimilar with medini metal model and OCL,

do you have some user guide or recommand website for OCL learning?

Jiawei

medini_1024169437

Hi Jiawei, glad it works.

or OCL I will create a separate article with links and docs.

Please mark as "answered" later here.

Jan

medini_1023641097

I used this topic as inspiration to create a Profile Property to be used in MSR FMEA or maybe any other FMEA in which it is required to define Measures not only for Causes, but also Failures and Effects.

The below snippet reads out a unique list of

all Measures linked to the Failure Mode and
all Measures linked to all Effects of that Failure Mode

the below snippet works for a Profile Property of "Failure (derived FMEA)"

self.element.oclAsType(safetyModel::Failure).measureGroups.detectionMeasures->union(
 self.element.oclAsType(safetyModel::Failure).measureGroups.preventionMeasures)->asSet()->union(
 self.element.oclAsType(safetyModel::Failure).causedBy.measureGroups.detectionMeasures)->asSet()->union(
 self.element.oclAsType(safetyModel::Failure).causedBy.measureGroups.preventionMeasures)->asSet()

medini_1024169437

Nice, thanks Nino for sharing.

Others may notice the need to convert some OCL results into a set to get it working. Reason is that each collection construct in OCL (Set, Bag, Sequence)

has its own definition of union() which only works with collections of the *same* type. The last call to asSet() is to eliminate duplicates.

Happy Scripting

Jan