item classification (Prediction vs FMEA)

[mlabella]

Dear Sirs,

We bought a copy of the software Windchill Quality Solutions 10.0 (Prediction MIL-HDBK-217, FMEA and FTA modules).

We have a problem regarding the items classification when we have a project that must be analyzed by means of all the three modules.

In order to get the Reliability Prediction of our system, we import the system Parts List and the Part Classification of the components must be set to General to compute their failure rate for the MIL-HDBK-217 model.

Then, we need to perform the system FMEA and we create our own components Failure Modes Library and we must specify the Failure Modes for all the components categories. In the Part Definition Pane, we must define the components Classifications and, since we have classified them as General in the Prediction module, we must use the same classification. Unfortunately, in the Failure Mode Library file, we can only specify the Failure Modes for the subcategory but not for the component type. for example, we can define the Failure Modes for the Subcategory Diode, but not for the Diode Type Switching or Zener. (On the contrary, we can define the Failure Modes for the resistors or capacitors type because are included as subcategory)

Since, for our applications is important to define the Failure Modes for the different types of diodes, how can we do this?

Other classifications in the Failure Modes Library File allow us to insert the Failure Modes for all the Diode Types, but the software does not apply these classifications because our components have been classified as General in the Prediction Module.

Anyone has suggestions?

Thank you in advance for your help!

[JasonA.Marzina]

The software does not go down to the type level for modes in the library. The reason that it does not do this is because there is no standard that does this. You can submit a suggestion via ourideas page: https://www.ptc.com/appserver/cs/misc/PTC_Product_Ideas.jsp.

[VladimirN]

The Ideas for Windchill can be create here: http://communities.ptc.com/community/windchill?view=idea

[DuaneL.Huffman]

Mattia,

For Diodes, you can use the Fault Equivalence file to bring in the failure modes for each type of diode. If you search for "Fault Equivalence" in Help it will provide details for how to create the file, define key fields, etc. In short it will work like this. You will define a field in the FMEA at the Item level called "Type". This will be the key field in the fault equivalence file. You will define Failure Mode and Mode % (if you are using that) as FMEA Tault Equivalence Data fields. In the fault equivalence file you will define the type and then enter the modes and percentages that you need in the FMEA. When you have a diode in the system that requires analysis you will enter the diode type in that field in the FMEA worksheet and it will pull in the failure modes and mode percentages that you define in the fault equivalence file. I have used this approach many times while performing FMEAs.

Duane