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Explore TEAMS!
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Bats /
JumperInitialModelAmpDraftReportIf you have recently posted your completed assignment please email Dr. Jumper or post a dated note here, otherwise you may use this space for questions or comments. I was able to get mine up Sunday night (4/6), thanks for accepting it. -Michael Harradon April 21 - Regarding Task 5, the Second Draft Design Report, too many people are rambling on about this or that, and are not running their models. No amount of talk is going to determin your best design strategy, you have to run your model, of course you have to have a tested model that seems to be producing results similar to the two or three group bats first to know that it is believable, but assuming you have done this, then the best way forward is to run your model to develop a reasonable design. STEP #1: Find a shell design (MOI) (density and thicknesses within the 4 - 8 layers) that will put you comfortably in the middle of your EndCap (EC) add-on MOI range! (That is run your model with the low-middle EndCap and Knob weights, longest length bat, optimize for minimum density and thichness. If the shell MOI comes in too high after initial fab you can cut it and or drop EC and Knob weight (model it down first), if it's too light, you can compensate with extra EC and Knob MOI. Again, you need to model it and play with the ranges, and note that your model should be much more reliable for estimating once the MOI and other measures of the fabricated shell are known.) STEP #2: Explore changes to the above basic design strategy that will reduce mass and increase CM, go to the extremes, short and fat, long and thin, explore both, which leaves you in the best flexible (post shell MOI) position, which is least sensitive to fab errors? Taking these tests and the model and fab errors into account, make your best judgement as to whether or not to shift your starting values from step #1 above to give yourself a shot at a winning design; whatever you do, don't leave yourself too close to the edge of the EC and Knob correction range. Again, you can't design without a model, this is a model driven design effort, if you're not using a model you need to get one working, or if you have one, use it. You'll get a chance at virtually every step of the fab to adjust your model to the physical output product and then redesign for the next fab step. Your model doesn't have to be perfect to beat waving your hands. The results that count are the final 'on the mark' MOIs, low Ms & large CMs, so get focused, forget everything else, swing speed, durability, etc., just focus on the objectives. Bill Jumper |