Create the Analysis Steps

Create analysis steps to extract the natural frequencies without and with preloading effects.

You use a frequency step to perform an eigenvalue extraction on a structure and identify the natural frequencies and corresponding mode shapes. You use a static step to perform a stress analysis by applying a static load to a structure.

In this example, you first create an initial frequency step (using the undeformed PCB as the base state) to extract the natural frequencies and mode shapes of the model without an applied load. You then create a static step to perform a stress analysis on the PCB and apply a load to the model to show the von Mises stress near the component connection points. Finally, you create another frequency step (using the deformed state of the PCB at the end of the static step as the base state) to extract the natural frequencies and mode shapes of the model with an applied static load.

This task shows you how to:

Define the Frequency Steps
Define the Structural Step

Define the Frequency Steps

From the Standard section of the action bar, confirm that Scenario is highlighted.
From the Procedures section of the action bar, click Frequency Step .
Name the frequency step Frequency_step.
Accept the default value for the Solver type.
Enter 50 for the Number of modes, and a Maximum frequency of 1500 Hz.
Click OK.
The app creates the preloading frequency.
Similarly, create a frequency step named Frequency_step_postloading that again extracts 50 eigenmodes with a maximum frequency of 1500 Hz.
The app creates the postloading frequency step.

Define the Structural Step

From the context selector, select the preloading frequency step.

The structural step will be created between the preloading and postloading frequency steps.
From the Procedures section of the action bar, click Static Step .
Name the static step Static_Step_Loading.
Enter an initial time increment of 0.11 s.
Accept the other default values, and click OK.
The app creates the static loading step.