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George Murphy Baseball Bat Engineering

George Murphy Baseball Bat Engineering. Personal Bat. Design Objective Create a composite baseball bat that will meet certain MOIs (rotational inertia). TARGET SHELL MOI 2200. TARGET FINAL MOI 4200. Mass Center of Mass 30.5, 29.5, or 28.5 inches long. Only 5 total ounces of resin.

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George Murphy Baseball Bat Engineering

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  1. George MurphyBaseball Bat Engineering

  2. Personal Bat • Design Objective • Create a composite baseball bat that will meet certain MOIs (rotational inertia) TARGET SHELL MOI 2200 TARGET FINAL MOI 4200

  3. Mass Center of Mass 30.5, 29.5, or 28.5 inches long. Only 5 total ounces of resin Design Parameters/Limitations Photo from: http://www.kettering.edu/~drussell/bats-new/bat-moi.html

  4. Introduction to Model • Based on braid angle of composite fibers. • Linear density • Thickness model • Assumptions and Givens • 8 fluid ounces of resin is spread equally. • Densities • Resin .63 oz/in3 • Fibers 1.1 oz/in3

  5. Results and Analysis My model was successful at predicting the range of results .34 % error SHELL MOI 2208 Final MOI 4017 SPECIFICATIONS 4.35% error Final Weight: 18.15 oz Cap Weight: 2.25 oz Knob weight: 2.75 oz CM: 16.5 in from Barrel Length: 29.5

  6. Group Project Introduction • Project #2 • Develop a method for determining density at any point based on certain variables. PROGRESSION OF VARIABLES Simplest Final Target Braid Angle Packing Distance Amount of Fibers Present Translational Velocity Rotational Velocity Radius of Mandrill rresin+rfiber=rbat

  7. Angle of the Fiber • Angle determines the amount of fiber present, resin seepage, and fiber movement. • Directly related to density

  8. Data Analysis • Note: 32 is in the denominator because at any there are 32 fibers braiding in each direction

  9. Closing Comments • The final project has a working density model, using the same principles as the previous model. • Incorporates velocities and radii, allowing for more accurate packing distance calculations, thickness modeling… the core of density analysis. • The braid angles/speeds are what we most control, effective to model.

  10. Q & A

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