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Update on Pendulum in Fluid

This update provides information on the settling time of a pendulum in fluid with linear drag and quadratic drag. It also discusses the use of PLA in 3D printing and its potential for use as supports. Additionally, it explores the transparency of polycarbonate and acrylic materials.

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Update on Pendulum in Fluid

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  1. Update on Pendulum in Fluid David Hann 10/09/14

  2. Differential Equation Model

  3. Settling Time (for Linear Drag)

  4. Constants Used

  5. Fluid Density > Solid Density

  6. Analytic Solution for Quadratic Drag • Allows for time response design • Linearized – no damping term • Nayef – for small damping term • Cvetićanin – allows strong damping term

  7. Steel BB in Water

  8. Large Drag Term

  9. PLA Printing • Brittle • Low Melting Point • Filament broke while printing hours into the print causing hours of repair • Possibility of Using PLA for supports • Solvent: Weak Acids, Benzene,

  10. Polycarbonate Printing • Price: $50/kg • Low Humidity Storage • Solvent: Chloroform

  11. Acrylic • Price: $20/kg • Solvent: Acetone • Possibility of an acetone vapor bath to smooth and clear

  12. Next Steps • Find Explicit Formula from Nayfeh to Settling Time • Implement Cvetićanin in MATLAB (low priority) • Test Transparency of Polycarbonate and Acrylic

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