Modal steady-state dynamic analysis (Abaqus)

The Steady-State Modal Dynamic analysis in the Abaqus environment calculates a system's linearized steady-state response to harmonic excitation. In a modal steady-state dynamic analysis, the response is based on modal superposition techniques.

The software first extracts the modes using the eigenfrequency extraction procedure. The modes include eigenmodes and residual modes, if activated in a eigenfrequency extraction step. The number of modes extracted must be enough to model the dynamic response of the system.

Defining frequency

Use the options in the Steady-State Modal Dynamic Step Parameters tab of the Solution Step dialog box to specify the frequency ranges of interest and the number of frequencies (points) at which results are required in each range. You also specify the bounding frequencies of the range and the type of frequency spacing to use, either linear or logarithmic.

You can select to space the frequency points for which you want results either:

• Equally along the frequency axis on a linear or a logarithmic scale.

• Biased toward the ends of the user-defined frequency range by specifying a bias value.

Defining base motion frequency history

Use a Base Motion - Frequency modeling object to define the motion of the nodes. You can define the motion as displacement, velocity, or acceleration history. You specify the modeling object in the Other Step Parameters tab of the Solution Step dialog box.

Boundary conditions

Supported boundary conditions

Loads

Loads are not supported in a Steady-State Modal Dynamic analysis.

Associated Abaqus keywords

• The Steady-State Modal Dynamic analysis corresponds to the Abaqus *STEADY-STATE DYNAMICS keyword.For more information, see Direct-solution steady-state dynamic analysis in the Abaqus Analysis User's Guide.

• The Base Motion - Frequency modeling object corresponds to the Abaqus *BASE MOTION keyword. For more information, see:Base Motion - Frequency dialog box (Abaqus)Base motion in the Mode-based steady-state dynamic analysis article of the Abaqus Analysis User's Guide.

Where do I find it?

Steady-State Modal Dynamic analysis

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partAbaqus as the specified solverStructural as the specified analysis typeGeneral Analysis as the specified solution typeSteady-State Modal Dynamic as the specified step

Base Motion - Frequency modeling object

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partAbaqus as the specified solver Structural as the specified analysis typeGeneral Analysis as the specified solution typeSteady-State Modal Dynamic as the specified step
Simulation Navigator	Right-click Modeling Objects
Location in dialog box	Type list→Base Motion - Frequency

Learn more

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Modeling abstractions (Abaqus)

User-defined progressive failure analysis (Abaqus)

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Modal steady-state dynamic analysis (Abaqus), Simcenter 3D 2021.1 Series

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