Specify excitation locations

Specify an Enforced Motion Location

An Enforced Motion Location is required if you want to apply an enforced motion excitation (displacement, velocity, or acceleration) or a DDAM excitation in your analysis event.

Note:

To perform these steps, your model must be meshed. Also, in the Node and Element Display dialog box, you must set Node Marker to Dot or Asterisk.

1. In the Simulation Navigator, under your solution node, right-click the Constraints node and choose New Constraint → Enforced Motion Location.

2. In the Enforced Motion Location dialog box, in the Name box, type a description for this enforced motion location.

3. In the graphics window, select one or more nodes on the model where you want to be able to apply an enforced motion excitation. The number in Select Object (0) reflects the number of nodes you select.

4. Under Displacement CSYS, select the coordinate system in which to apply the enforced motion.

5. Under Degrees of Freedom, select Enforced for each direction in which you want to be able to apply the actual excitation. For example, to set up the enforced motion location to accept an excitation in the Y direction, set DOF2 to Enforced. When you solve the solution, a constraint mode is generated for each enforced DOF for each node in the location.Note: For any DOF not set to Enforced (that is, “free”), you must fix that DOF with another constraint, such as with a User Defined constraint.

6. Click OK.

Specify a Nodal Force Location

A Nodal Force Location is required if you want to apply a nodal force excitation, and you are using Mode Acceleration as the Data Recovery method in your analysis event.

Note:

To perform these steps, your model must be meshed. Also, in the Node and Element Display dialog box, you must set Node Marker to Dot or Asterisk.

1. In the Simulation Navigator, under the Dynamics subcase, right-click the Loads node and choose New Load → Nodal Force Location.

2. In the Nodal Force Location dialog box, in the Name box, type a description for this nodal force excitation location.

3. In the graphics window, select one or more nodes on the model where you want to be able to apply a nodal force excitation. The number in Select Object (0) reflects the number of nodes you select.

4. Under Degrees of Freedom, select Nodal Force for each direction in which you want to be able to apply the actual excitation. For example, to set up the Nodal Force Location to accept an excitation in the Y direction, set DOF2 to Nodal Force. When you solve the solution, for each node in the location, an attachment mode is generated for each DOF set to Nodal Force.

5. Click OK. The load is added to the Dynamics subcase.

Specify a distributed load location

To pre-define a location for a distributed-load excitation, you must add a load (any load type other than a Nodal Force Location) in the Dynamics subcase. For more information, see Define Dynamic loads for distributed-load excitations.

How do I

Define Static Offset and Stress Stiffening

Define Dynamic loads for distributed-load excitations

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FE model and boundary conditions

Enforced motion and nodal force locations

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Specify excitation locations, Simcenter 3D 2021.1 Series

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