Exciter selection configuration

Video: Create optimum exciters for test planning

Use the Exciter Configurations commands to create, edit, and solve the exciter selection configuration. The exciter selection configuration is used to select optimum exciter locations and directions for a selected set of sensors. You specify the selection method and the settings for the exciter selection algorithm.

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

Pre-test exciters’ location in red with excited sensors in blue

Exciter selection algorithms

To determine optimal exciter locations, you can use a normal mode indicator function (NMIF) or driving point residue (DPR) algorithms.

The NMIF algorithm, for each candidate exciter DOF, computes mode indicator functions at the defined sensors and for the active modes. Using the calculated maximum NMIF values and the specified NMIF threshold value, the algorithm identifies the DOFs which excite the most modes. See Normal Mode Indicator Function (NMIF) algorithm for more information.

The DPR algorithm, for each candidate exciter DOF, computes drive point residues at the defined sensors and for the active modes. It also computes minimum, maximum, average, and weighted average residue values, which are presented in a sorted matrix format. You can determine how many exciters to display. See Driving Point Residue algorithm for more information.

The NMIF algorithm uses mode weights for exciter selection, but the DPR algorithm does not consider them.

Configurations node in the Simulation Navigator

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 If the exciter configuration is undefined or outdated, an update icon appears.

Pre-Test 1	Active
Solution 1 Results	Active
Sensor Selection
Exciter Selection
Sensor DOF [10]
Candidate DOF [885]
Configurations [2]
NMIF 1	Active
DPR 1

When you select a specific exciter configuration node in the Simulation Navigator, the graphics window displays the exciter locations in red and the sensor DOFs in blue.

Where do I find it?

Application	Pre/Post
Prerequisite	An active pre-test solution process
Command Finder	New Exciter Configuration or Edit Active Exciter Configuration or Solve Active NMIF Configuration or Solve All NMIF Configurations or Select Active DPR Exciters
Simulation Navigator	(Create configuration) Exciter Selection node → right-click the Configurations [#] node → New (Edit configuration) Exciter Selection node → Configurations [#] node → right-click the NMIF or DPR→ Edit (Solve configuration) Exciter Selection node → Configurations [#] node → right-click the NMIF→ Solve or DPR→Select Exciters(Solve NMIFconfigurations) Exciter Selection node → right-click the Configurations [#] node → Solve All NMIF

How do I

Create an exciter selection configuration

Select an exciter

Solve exciter selection configurations

Display exciter set information

Look up more details

Exciter set information

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Exciter selection configuration, Simcenter 3D 2021.1 Series

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