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Performing Linear Dynamic Analysis

To perform modal time history analysis:

  1. Create a linear dynamic study. Right-click the top icon in the Simulation study tree and select Study . You can define a solid, shell, or mixed mesh study. Beams are not supported. Select Linear Dynamic, and under Options, click Modal Time History . Define the frequency and dynamic properties of the study.

You can create a linear dynamic study from an existing frequency study. Right-click the frequency study icon and select Copy to New Dynamic Study.

  1. Define material for each solid and shell. To define a material for a solid or shell right-click its icon in the Simulation study tree and select Apply/Edit Material.

  2. Define restraints. Right-click the Fixtures icon in the Simulation study tree and select from the options. You can also apply spring-damper connectors.

  3. Define damping. Right-click the Damping folder in the Simulation study tree and select Edit/Define. You can define modal, composite modal or Rayleigh damping.

  4. Define loads. You can define time-dependent force, and pressure loads, uniform and selected base excitations, and initial conditions.

  5. Define Result Options. Right-click the Result Options folder in the Simulation study tree and select Edit/Define.

  6. Mesh the model and run the study. First the program calculates the natural frequencies (if not available), and then it proceeds to the modal time history solution.

You can request to run the study only for frequencies. Right-click the study icon and select Run frequency.

  1. View the results:

    • Double-click an icon in the Results folder to display the associated plot.

    • To define a new plot, right-click the Results folder and select the desired option. You can plot displacements, accelerations, velocities, stresses, strains, and deformations for a specified solution step or extreme values across all solution steps.

    • To define a time history plot at a specified node, right-click the Results folder and select Define Response Graph.

    • To list results, right-click the Results folder, and select the desired option. You can list , natural frequencies, mass participation factors, stresses, displacements, accelerations, velocities, strains, and reaction forces.

Click here for more result viewing options.

To perform harmonic analysis:

  1. Create a linear dynamic study. Right-click the top icon in the Simulation study tree and select Study . You can define a solid, shell, or mixed mesh study. Select Linear Dynamic, and under Options, click Harmonic . Define the frequency and dynamic properties of the study.

  1. Define material for each solid and shell. To define a material for a solid or shell right-click its icon in the Simulation study tree and select Apply/Edit Material.

  2. Define restraints. Right-click the Fixtures icon in the Simulation study tree and select from the options. You can also apply spring connectors.

  3. Define damping. Right-click the Damping folder in the Simulation study tree and select Edit/Define. You can define modal, composite modal or Rayleigh damping.

  4. Define loads. You can define frequency -dependent  force, and pressure loads, uniform and selected base excitations.

  5. Define Result Options. Right-click the Result Options folder in the Simulation study tree and select Edit/Define.

  6. Mesh the model and run the study.

  1. View the results:

    • Double-click an icon in the Results folder to display the associated plot.

    • To define a new plot, right-click the Result folder  and select the desired option. You can plot displacements, accelerations, velocities, stresses, strains, and deformations for a specified solution step or extreme values across all solution steps.

    • To define a frequency response plot at a specified node, right-click the Results folder and select Define Response Graph. You can plot stresses, displacements, velocities, and accelerations.

    • To list results, right-click the Results folder and select the desired option. You can list , natural frequencies, mass participation factors, stresses, displacements, accelerations, velocities, strains, and reaction forces.

Click here for more result viewing options.

To perform random vibration analysis

  1. Create a linear dynamic study. Right-click the top icon in the Simulation study tree and select Study . You can define a solid, shell, or mixed mesh study. Select Linear Dynamic, and under Options, click Random Vibration . Define the frequency and dynamic properties of the study.

  1. Define material for each solid and shell. To define a material for a solid or shell right-click its icon in the Simulation study tree and select Apply/Edit Material.

  2. Define restraints. Right-click the Fixtures icon in the Simulation study tree and select from the options. You can also apply spring connectors to link components.

  3. Define damping. Right-click the Damping folder in the Simulation study tree and select Edit/Define. You can define modal, composite modal or Rayleigh damping.

  4. Define loads. You can define psd curves of force, pressure, uniform and selected base excitations.

  5. Define Result Options. Right-click the Result Options folder in the Simulation study tree and select Edit/Define.

  6. Mesh the model and run the study.

  1. View the results:

    • Double-click an icon in the Results folder to display the associated plot.

    • To define a new plot, right-click the Results folder  and select the desired option. You can plot psd of displacements, accelerations, velocities, stresses, strains, and deformations for a specified solution step or extreme values across all solution steps.

    • To define a psd response plot at a specified node, right-click the Results folder and select Define Response Graph. You can plot psd of stresses, displacements, velocities, and accelerations.

    • To list results, right-click the Results folder and select the desired option. You can list , natural frequencies, mass participation factors, stresses, displacements, accelerations, velocities, strains, and reaction forces.

Click here for more result viewing options.



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