Computation and result analysis

Reference

All computations of FIDES Lab follow to the requirements of FIDES Guide 2022. This software is 100% compatible with the guide. In this help we won't describe the formulas used for the computation of component failure rate, please refer to the guide for formulas. A component family has its own set of formulas, if you don't have access to the FIDES guide you can see the formulas thanks to the info button next to the family drop down menu.

Note: It is possible to double-click on the image in order to open it in the operating system default viewer.

All failure rates are in FIT (10^-9 h10^-1)

Computation configuration panel

Computations are done in a separate window. To open the computation window click on the

The computation window is empty by default:

At the top, it contains several field that will be filled after computation:

Computed lambda: The lambda of the product. it is the sum of the lambda of all components
Computation date: when you did the last computation
Compliance: a flag that says is this document is compliant with FIDES standard, it won't be if you ie values out of scope or custom families
Up to date: checked is the model was not modified since the last computation

In the middle part, there is a button and a progress bar. once computation will be done, the button will become a Clear button.

At the bottom, there are 4 tabs related to the results :

Log: that shows the computation process
Detailed values
List values
Compliance

Here, the only thing you can do is using the , it will start FIDES computation. While the software is computing, you can see the details of the computation in the log tab

Detailed values

Once computation is done, the Detailed panel is selected and display 2 tables. The first panel on the left contains the overall result for each container or component, it is the weighted value over the full profile duration.

It contains the following columns:

Type: System, sub-system, equipment, …., component
ID: a unique ID that identifies the different containers/components is case they have the same name
Parent: the parent in the hierarchy
Name: the name of the entity
Quantity: for components, the value of the quantity parameter
Family
Mission profile
λ_{cst_unit}: the constant Lambda per unit
λ_{cst_total}: the total constant Lambda for the line (value of the previous column multiplied by the quantity)
λ_{wear_out_unit}: the Lambda wear-out per unit
λ_{wear_out_total}: the total Lambda wear-out for the line (value of the previous column multiplied by the quantity)
λ_unitary: the sum of λ_{cst_unit} and λ_{wear_out_unit}
λ_total: the sum of λ_{cst_total} and λ_{wear_out_total}

In the left table, you don't have access to the decomposition of the failure rate for a component, but once you have selected a line, the table on the right displays the details per phase and per stress for the selected component. Warning: all the failure rates in this table is weighted values. On a line the value is not the one directly computed for the phase but the value_computed_for_the_phase * duration_of_the_phase / duration_of_the profile.

Doing like this you have the part of the total lambda (for the total duration) that is due to a phase, and you can do the sum of the values per phase to have the full lambda for the total duration of the profile.

Synthesis

The synthesis tab contains all the data available in the Detail tab but in only one table. A component with a profile containing N phase will be displayed over N+1 lines, the first line for the total (over the profile duration) and then one line per phase. The table has a very large number of column since its displays all the possible λ for a component or a container.

Compliance

The compliance tab gathers all the things that are not compliant with the FIDES Guide. A top banner displays the number of deviation, and the table explains what is not compliant and must be fixed (if you want to be compliant)

Start a new computation

After any modification on your BOM or profiles, you need to restart the computation. Since the computation window handle only one result, you have to clear the previous results before starting a new computation.