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George Murphy Baseball Bat Engineering

This project focuses on developing a composite baseball bat that meets specific design objectives, including a shell moment of inertia (MOI) of 2200 and a final MOI of 4200. The bat's mass center is configured for lengths of 28.5, 29.5, or 30.5 inches, using a maximum of 5 ounces of resin. The model incorporates factors such as braid angle, fiber density, and resin specifications, achieving a 34% error in predictions. The final project enhances density modeling by incorporating variables like fiber velocity and packing distance for improved accuracy.

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George Murphy Baseball Bat Engineering

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Presentation Transcript

  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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