You do not know the test speed or what maximum load you will need to apply to your product. So, you want to try several speeds and loads until the results look correct.
Add these variables as number inputs:
Using Expression Builder, select the number inputs appropriately for your test:
Now, in the workspace, you can simply type in different test speeds or maximum load criteria to validate your product taking a trial-and-error approach.
Using Expression Builder within Bluehill 3 should expedite your design validation process.
To learn more about the benefits of Expression Builder, this video may be helpful.