Second Version of Acrobatic Bike: Changes, Iterations, and RChristopher Graff ACROBATIC BIKE Jan 28, 2004 Georgene Hilb 16.810 – IAP Second Version of Acrobatic Bike: Changes, Iterations, and Results: The changes from the first version to the second version can be summarized as adding more truss-like elements to the design. We went from a 5-member truss design to a 32-member design. Screen shots of the different models can be viewed below. Version 1 Version 2 (Iteration 12) The changes of our FEA results throughout each iteration can be seen below: s can be seen, Version 2, Iteration 12 meets the mass and displacement requirements. However llowed relaxations of requirements were given for mass and cost. We have an unlimited cost requirement now, and a 0.40 lb mass requirement (formerly 0.16 lb). Version.IterationMass (kg) Disp 1 (mm) Disp 2 (mm) Freq (Hz)No. of Members CostOrig. Req 0.07273 0.06300 0.01000 632.20 $10.141 0.06350 0.22500 0.01510 424.39 5 $6.992.2 0.09310 0.15500 0.00618 458.25 10 YTBD2.3 0.10300 0.11980 0.01050 535.62 16 YTBD2.6 0.15240 0.06530 0.00833 545.50 15 YTBD2.7 0.16770 0.06700 0.00905 555.06 14 YTBD2.8 0.18414 0.05320 0.00636 551.24 23 YTBD2.9 0.18260 0.05490 0.00733 571.99 24 YTBD2.10 0.18323 0.05410 0.00735 578.35 27 YTBD2.11 0.18200 0.05400 0.00690 586.16 32 YTBD2.12 0.17660 0.05690 0.00715 581.50 32 YTBDModified Req. 0.18182 0.06300 0.01000 632.20 UnlimitedAit falls short by 8% (or 50.70 Hz) of the minimum first mode frequency. We would like to have a relaxation of this requirement, if possible, in order for this part to have meet all the modified requirements. AFinite Element Analysis: Below are screen shots of the Finite Element Analysis completed for Version 2, Iteration 12. Displacement Analysis Frequency
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