WORKSHOP 6 -- REAR RACK (MODAL) ANALYSIS

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Problem Description
Assume the dynamic characteristics of this bike with a 200 lb person traveling at 40 mph down a cobble stone road is: Mode 1=95 Hz, Mode 2 = 100 Hz, Mode 3 = 110 Hz, Mode 4 = 120 Hz, Mode 5 = 135 Hz.
A rear rack accessory capable of supporting 150 lbs may be attached to the frame. You are asked to analyze this rack under dynamic loading.
Perform a normal modes analysis to determine if the frequency of the bike is close to one of the natural frequencies of the rack. This is to avoid excessive vibrations and find “soft spots” (smooth, comfortable ride).
Suggested Exercise Steps
Open the existing CATIA part in the Part Design workbench.
Apply aluminum material properties to the part.
Create a Frequency analysis document (.CATAnalysis).
Pre-process initial finite element mesh.
Apply a clamp restraint.
Apply a mass equipment load.
Compute the analysis.
Visualize the analysis results.
Generate a report of the results.
Save the analysis document.