Human Electric Trike Thesis

Design of an electrically assisted human powered trike

Swing Arm Stress Analysis – Updated

Posted by Bob Dold on Monday, October 2, 2006 10:57 PM

After checking my intitial analysis I found some errors that caused the arm to see 4X the loadin it should have, here are the corrected results:

 

I analyzed the swing arm with a 3G vertical load, 2G aft load, and 1G lateral load, with G being equal to 140# which is the loaded weight on the rear wheel. I used a mixed shell and solid mesh in CosmosWorks 2006 as shown below:

 Von-Mises stress plot and displacement are shown below:

 

Max stress at this extreme condition is 17ksi, which is well below the 42ksi ultimate and 35ksi yield for 6061-T6 aluminum tube (Mil Hndbk 5)

Displacement is accptable at about an 1/8 of an inch at the dropouts.

 

– Updated 10-8-06

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