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Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege

Engineering 25. Tutorial: PolyFit 1 st ,2 nd , 3 rd , 4 th. Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege.edu. PolyFit for PolyMers. In ENGR45 you will learn that the production of PolyMers (Plastics) requires Chemical Reactions The polymer rcns maybe

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Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege

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  1. Engineering 25 Tutorial:PolyFit1st,2nd, 3rd, 4th Bruce Mayer, PE Licensed Electrical & Mechanical EngineerBMayer@ChabotCollege.edu

  2. PolyFit for PolyMers • In ENGR45 you will learn that the production of PolyMers (Plastics) requires Chemical Reactions • The polymer rcns maybe • Single ReAgent • Multiple ReAgent

  3. MultiReagent Reaction • The Curing Time, t, for a Batch of certain Polymer varies the amount of Reagent, R, as shown in the Data-Table (T-Table) Below • For this Data SetFind • 1st thru 4th degreepolynomials thatbest fit the data • Determine theall the polynomial’s goodness of fit byfinding J, S, and r2

  4. MultiReagent Reaction • Plot Each polynomialand the actual Dataon the Same Graph • Use the Low-r2polynomials to estimate the Amountof ReAgent that willMinimize the CuringTime

  5. The Plots • Use 2X2 SubPlot

  6. The Results The J values for polynomial degrees 1-4: 1.0e+05 * 2.1442 0.0676 0.0647 0.0621 The S value for this data set: 2.2477e+05 The r-sqd values for polynomial degrees 1-4: 0.0461 0.9699 0.9712 0.9724 The Best r-sqd value is for degree = 4 The amount of R (in kg) for minimum cure-time 4.8400 The minimum cure-time in seconds 897.5275

  7. The MATLAB File-1

  8. The MATLAB File-2

  9. Digital Data Table

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