Sensor selection configuration

Use the Sensor Configurations commands to create or edit the sensor configuration that specifies the algorithm used to select optimum sensors and the settings for the sensor selection algorithm.

Sensor definitions

When creating a sensor configuration, you can select the following sensor types:

• A uniaxial sensor has one active translational DOF.

• A triaxial sensor has three active translational DOFs.

A node can have one triaxial sensor or up to three uniaxial sensors.

Algorithms for sensor selection

For a sensor configuration, you can choose one of the following algorithms:

• The Min-MAC algorithm minimizes the values of the off-diagonal elements in the MAC matrix by adding specified numbers of uniaxial and/or triaxial sensors from a candidate set of DOFs to the required set of DOFs. For more information, see Min-MAC algorithm.

• The MODMAC algorithm reduces the values of the off-diagonal elements in the MAC matrix to a specified MAC value limit or until the maximum number of DOFs is reached by adding a maximum number of candidate DOFs to an optional, initial set of DOFs. You can specify uniaxial or triaxial sensors. For more information, see MODMAC algorithm.

The Min-Mac algorithm uses mode weights for sensor selection, but the MODMAC algorithm does not consider them.

Criteria for using the algorithms

When you define the number of uniaxial and triaxial sensors for your configuration, certain conditions must be met for the Min-MAC or MODMAC algorithms:

• For the Min-MAC algorithm the number of uniaxial sensors you set, must be more than three times the number of triaxial sensors and greater or equal to the number of required DOFs. The number of triaxial sensors you set, must be less than or equal to the number of nodes that have all three translational DOFs in the candidate, or required DOF sets.

• For the MODMAC algorithm, at least one candidate node must have all translational DOFs defined, when you choose a triaxial sensor type.

Detail information on sensor configurations

You can create multiple sensor selection configurations for a pre-test solution process and then solve all them at the same time or only solve the active configuration.

In the Simulation Navigator, under the Configurations [#] node, all the sensor configuration nodes are listed. If the sensor configuration is undefined or outdated, an update icon appears.

Pre-Test 1	Active
Solution 1 Results
Modes [30]	Ready
Sensor Selection
Candidate DOF [885]
Required DOF [42]
Configurations [3]
Min-MAC 1
MODMAC 1
Min-MAC 2
Exciter Selection

When you select the Configurations [#] node in the Simulation Navigator, the Correlation Details View subpanel displays the following for each sensor configuration:

• The number of uniaxial sensors, triaxial sensors, and DOFs.

• The result status which can be undefined, outdated, or up-to-date.

• The MAC error, which is the largest off-diagonal value of the Auto-MAC matrix.

When you select a specific sensor configuration node in the Simulation Navigator, the Correlation Details View subpanel displays the following for each sensor:

• The axiality

• The node ID

• The active translational DOFs

• The extraction order

For more information, see Correlation Details View subpanel (pre-test solution process).

When you select a specific sensor configuration node in the Simulation Navigator, the graphics window displays the sensor locations.

Where do I find it?

Application	Pre/Post
Prerequisite	An active pre-test solution process
Command Finder	New Sensor Configuration or Edit Active Sensor Configuration or Solve Active Sensor Configuration or Solve All Sensor Configurations
Simulation Navigator	(Create configuration) Sensor Selection node → right-click the Configurations [#] node → New (Edit configuration) Sensor Selection node → Configurations [#] node → right-click a Min-MAC or MODMAC node → Edit (Solve configuration) Sensor Selection node → Configurations [#] node → right-click a Min-MAC or MODMAC node → Solve (Solve all configurations) Sensor Selection node → right-click the Configurations [#] node → Solve All

How do I

Create a new sensor selection configuration

Edit the active sensor selection configuration

Solve sensor selection configurations

Display Pre-Test Auto-MAC results

Generate a DOF set that matches the sensor location

Export a test analysis reference solution

Quick links

Command reference

Pre/Post video examples

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Sensor selection configuration, Simcenter 3D 2021.1 Series

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