SS-T: 4025 Modal Prestressed

Apply prestress conditions to modal analysis.

Prerequisites
Some features used in this tutorial are only available in SimSolid Advanced version. Please switch to Advanced to complete this tutorial.
Purpose
SimSolid performs meshless structural analysis that works on full featured parts and assemblies, is tolerant of geometric imperfections, and runs in seconds to minutes. In this tutorial, you will do the following:
  • Learn how to setup prestressed modal.
  • Compare prestressed and non-prestressed modal results.
Model Description
The following model files are needed for this tutorial:
  • Crankshaft_Prestressed.ssp

Open Project

  1. Start a new SimSolid session.
  2. On the main window toolbar, click Open Project .
  3. In the Open project file dialog, choose Crankshaft_Prestressed.ssp
  4. Click OK.

Create Modal Analysis

  1. On the main window toolbar, click the (Modal analysis) icon.
  2. In the popup Number of modes window, specify the number of modes as 9.
  3. Click OK.
    The new modal analysis appears in the Project Tree.

Create Immovable Support

  1. In the Analysis Workbench, click Immovable Support .
  2. In the dialog, verify the Faces radio button is selected.
  3. In the modeling window, select the faces shown in Figure 1.


    Figure 1.
  4. Click OK.

Create Hinge Support

  1. In the Analysis Workbench, click Hinge Support .
  2. Select the face shown in Figure 2.


    Figure 2.
  3. Click Apply, then click Close.

Create Structural Linear Analysis

On the main window toolbar, click Structural Analysis > Structural linear.
The new analysis appears in the Project Tree under Design study 1 and the Analysis Workbench opens.

Copy Supports to Analysis

  1. Under the Modal 1 analysis, right-click on Immovable 1 and select Copy to > Structural 1.
  2. Right-click on Hinge 1 and select Copy to > Structural 1.

Create Rotational Inertia

  1. From the Structural 1 Analysis Workbench, click Inertia Load > Rotational inertia.
  2. In the dialog, click the Select a cylinder radio button and select the cylinder Hinge 1 is applied to.
  3. For Angular velocity, enter 5000 and change the units to RPM.
  4. For Angular acceleration, enter 50 rad/sec^2.
  5. Click OK.

Create Modal Prestressed Analysis

  1. On the main window toolbar, click Modal > Modal prestressed icon.
  2. In the Modal prestressed setup window, select Structural 1.
  3. For Number of modes to find, enter 9.
    The new analysis (Modal 2, linked to Structural 1) appears in the Project Tree under Design study 1 and the Analysis Workbench opens.

Run Design Study

Solve all analyses in the design study.

  1. In the Project Tree, select Design study 1 branch.
  2. Click Run All Analyses .
  3. In the Solver Manager, verify all analyses are selected.
  4. Click Solve.
    SimSolid runs all analyses in the design study branch. When finished, a Results branch for each analysis appears in the Project Tree.

Compare Results

  1. Review the results for Modal 1 and Modal 2.
  2. Observe the frequencies in Modal 2, linked to Structural 1 are slightly higher due to the prestressed state.