MAC Contribution

Use the MAC Contribution command to determine which sensor is problematic in the active sensor set for a specific mode pair. It helps you determine which sensors to remove from the sensor set to meet specified modal assurance criteria (MAC) target. The values of the MAC of each removed DOF are plotted on the bar chart.

MAC contribution bar chart shows the most sensitive sensors

The MAC contribution is the difference in the MAC value computed using all degrees of freedom (DOFs) in the active sensor set, and the MAC value, excluding the selected DOF in the active sensor set:

MC_i=MAC-MAC_i

where:

• MC_i is a MAC contribution for DOFi.

• MAC is the MAC value computed using all DOFs in the active sensor set. For more information, see Modal Assurance Criteria (MAC).

• MAC_i is the MAC value computed using all active DOFs except DOFi.

After computing MAC contribution for all selected active sensor set DOFs, the software finds the DOF that gives the maximum increase to the MAC value. This DOF is removed from the sensor set and the process starts again to find the DOF that gives the maximum increase to the MAC value. DOF removal continues until no more DOFs can be removed or the MAC value reaches the specified MAC target.

Where do I find it?

Application	Pre/Post
Prerequisite	2D matrix plot displayed in the graphic window
Command Finder	Probing Mode
Location in dialog box	Right-click a cell in a MAC matrix→MAC Contribution

How do I

Display correlation metrics as 2D matrix plots

Edit 2D matrix plot display

Export correlation metric results

Display COMAC results in Post Processing

Plot mode shapes of the work and reference solutions

Display the MAC Contribution results

Display overlay FRFs at specified stretch parameter

Learn more

Correlation metrics

MODMAC Evolution

FRF pair XY plots

FRAC plots

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

MAC Contribution, Simcenter 3D 2021.1 Series

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