Overview: Rebuild (or reuse) the Cantilever Beam model for a modal analysis.
Discuss: What exactly is a modal analysis? What’s the equation of state? How would it be used to optimize geometry?
Next:
Set the far side surface to d=r=0, just like before, but do not add a load.
Find the first five resonant mode frequencies of the cantilever beam
Next: Let’s Post Process the results…
Animations are the most effective way to visualize the mode shape
What is unique about the displacement quantities on the fringe legend?
Discuss the qualitative vs. quantitative aspects of the results.
Next: Record the five resonant frequencies in a spreadsheet before moving on to the next step.
Next: Increase the stiffness of this part by adding a 4″ x 4″ rib down the center of the board.
Explore:
Rerun the modal, record and compare the new resonances, and determine what changed
Update the height of the rib to 8″ and rerun the analysis. Record and compare the new resonances then discuss trends.
Rerun the ribs at heights of 12″, 16″, and 20″. Discuss what is happening to the mode shapes.
Design Challenge: List three separate ways this design could be changed in order to increase the first mode frequency. Pick one of those ways and pursue it by updating the design to raise the first mode over 100hz.
Next: Let’s analyze this aluminum sheet metal bracket.
Constrain the QTY = 6, .25″ diameter mounting holes on the linked sheet metal bracket below to d=0
Use Creo Simulate to determine all resonant frequencies under 1,000 Hz
Try: Sheet metal parts use inefficient meshes due to the thin features. Create a shell model in Creo Simulate to facilitate quicker solve times without an impact to accuracy. Rerun the analysis and compare the resonances and mode shapes.
Design Challenge: Redesign this bracket (by removing material) to make it 50% lighter and increase the first mode resonance as high as possible.
