Response Dynamics workflow

The following steps summarize the overall process you should follow to analyze the response of a structure to an excitation.

Step	Summary	Detailed help topic
1. Build the finite element (FE) model.	In the Pre/Post application, define the geometry, material properties, mesh, and constraints, as you would for other structural solution types. For Response Dynamics, you must also specify the locations of your excitations as well as any static and dynamic loads.	FE model and boundary conditionsSpecify excitation locations
2. Or create an assembly FEM.	You can also combine finite element models in an assembly FEM. The assembly FEM can also contain FEMs defined by a Mode Set.	Alternate representation (component FEM file)
3. Create the Simcenter Nastran solution.	Create a Simcenter Nastran SOL 103 – Response Dynamics solution. In the Dynamics subcase, specify your output result types (such as stress, displacements, and so on) and other result options for the Simcenter Nastran solution, such as the number of modes. You can also use an SOL 103 Real Eigenvalues solution, but it generates only the normal modes and does not consider loads.	Defining the Simcenter Nastran solutionDefine rigid-body mode tolerance for Simcenter NastranDefine Response Dynamics result typesDefine the frequency range and number of modes to solve
4. Solve the model.	Simcenter Nastran generates normal modes, constraint modes, attachment modes, and other modal information.	Solve for the modal model
5. Create the solution process.	After solving the model, create the Response Dynamics solution process.	Create a Response Dynamics solution process
6. Review the mode shapes.	Review the mode shapes in the Post Processing Navigator or in the Response Dynamics Details View subpanel in the Simulation Navigator.By default, all modes generated during the solve are considered “active” for use in your solution process. If your solution contains a large number of modes, you can exclude the insignificant modes to make the solution process complete faster.	Check validity of mode shapesSelect or remove modes to analyze in Response Dynamics
7. Define the damping values for each mode.	In the Response Dynamics Details View subpanel, you can adjust the effectiveness of individual normal modes by adding viscous and hysteretic modal damping. If your Simcenter Nastran solution contains physical damping, such as damper elements, you can include that damping in your solution process as well.	Define modal dampingDefine physical damping
8. Create an event.	An event defines the type of solution process you will perform (transient, quasi-static, frequency, random, response spectrum, or DDAM). It combines the modal model and your excitation functions. When you create the event, you specify the data recovery method, which is the software method for recovering the dynamic physical responses of a model from its modal response.	EventsData recoveryCreate an event
9. Create excitation functions.	Excitations define the loading for the solution process, such as a vehicle's tires following a bump's profile. You can apply nodal force, enforced motion, distributed load, velocity impact, or static excitations. Excitations must be applied on the excitation locations you specified in your model prior to solving the Simcenter Nastran solution.	Excitation loads
10. Analyze the model's dynamic responses to the excitations.	Depending on the type of response you are evaluating, the software calculates and stores the results in one of these formats. Response functions each contain one response (for example, stress at one node) as a function of time or frequency. You can plot these function records in the graphics window. Response results sets each contain responses for multiple nodes or elements in the model for one time step or frequency. You can view response results sets as contour plots on the Post Processing Navigator.	Response functions

How do I

Create a Response Dynamics solution process

Clone a Response Dynamics solution process

Check validity of mode shapes

Select or remove modes to analyze in Response Dynamics

Clear the obsolete status of a Response Dynamics solution process

Learn more

Simcenter 3D Response Dynamics

Simulation Navigator for Response Dynamics

Post processing response results after clearing the obsolete status

CBUSH element force in Response Dynamics

Random Base Excitation

Response Dynamics Function Toolkit

Look up more details

Response Dynamics Details View subpanel (Simulation Navigator)

Response Dynamics status labels

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

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Related Topics

Deactivate modes by mass limit in Response Dynamics

Response Dynamics workflow, Simcenter 3D 2021.1 Series

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