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Group 19 Hing Lawrence Lau Jonathan Lawson Bryan Urquhart Sammy Zargaran

Group 19 Hing Lawrence Lau Jonathan Lawson Bryan Urquhart Sammy Zargaran. Dr. Eric Lauga. Ph.D. in Applied Mathematics from Harvard in 2005 Assistant professor at MIT in the Mathematics department from 2006 to 2007

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Group 19 Hing Lawrence Lau Jonathan Lawson Bryan Urquhart Sammy Zargaran

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  1. Group 19 Hing Lawrence Lau Jonathan Lawson Bryan Urquhart Sammy Zargaran

  2. Dr. Eric Lauga • Ph.D. in Applied Mathematics from Harvard in 2005 • Assistant professor at MIT in the Mathematics department from 2006 to 2007 • Professor Lauga's research focuses on physical hydrodynamics, micro-fluidics, biophysics and the biomechanics of locomotion • Sammy

  3. Project Objectives • Many microorganisms move by means of flagella. The motion of the flagella propagates down the length like a sine wave. • Sammy

  4. Project Objectives • Similarity analysis can be performed to quantify flow characteristics: • - • This type of creeping flow with Re<<1 is called Stokes Flow • Sammy

  5. Project Objectives • Microorganisms live in the Stokes Flow regime • Viscosity effects dominate over momentum effects • Microorganisms move by means of flagella • These flagella have many degrees of freedom • Why isn’t there a microorganism that moves via single degree of freedom motion? • Sammy

  6. Project Description • Single Degree of Freedom • Capable of motion in Stokes flow (Re << 1) • Never witnessed in nature • A Self-contained torus, designed to move in Stokes Flow, has never been constructed • Project goal was to create a torus that can move in the Stokes Flow regime • How does it work? • Sammy

  7. How it Moves I • The surface of the torus rotates as shown which results in Torus motion. u ω ω u • Jonathan

  8. How it Moves II Flow Field • Jonathan

  9. Final Design: Overview • Features: • Two miniature geared motors to rotate surface • Controlled with model aircraft motor driver for wireless control • Jonathan

  10. Actuation System Motor Mount Dive Disk attached to Motor Assembly Motor • Lawrence

  11. Power System Battery Housing Battery Protection Circuit and Motor Drive Housing Cool Feature: snap fitting base for housings PCB • Lawrence

  12. Control System Motor Driver Motor Driver Housing Receiver Housing Transmitter • Lawrence

  13. Rotating Skin Helical Coil as support to maintain longitudinal cross-section • Lawrence

  14. Demonstration

  15. Heat Generation • Assumptions: • The skin of the torus was a perfect insulator and that no heat would be lost to the fluid • All energy consumed by components was converted into thermal energy The total increase in temperature when the system is run for 30 minutes is 35 K • Jonathan

  16. Power Consumption Theoretical Power Consumption (not loaded): Theoretical battery life is92 mins Actual Power Consumption (loaded) is3.7W while the tested battery life is52 mins • Jonathan

  17. A1 A2 ω a Fluid Simulation I • To gain some initial insight to the torus motion, a MATLAB simulation was constructed. • Approximating a section as a cylinder, shear stresses were calculated. • Integrating the shear stress with respect to area leaves a net force on the torus which is the basis of its motion. • Bryan

  18. Fluid Simulation II • Some results using current size parameters: • Velocity: • This may seem slow, but this is actually faster than the motion expected by our sponsor • Bryan

  19. Performance • The donut successfully rotates as intended around the internal components • Performance Characteristics: • Runtime – 52 minutes • Rotational Speed – 6 rpm • Bryan

  20. Conclusions / Recommendations • Different Motor Controller • Computer control • Actuation • Data Acquisition • Fluid-Torus Interface • Power • Battery Charging • External Power Button • Slip Ring(s) • Bryan

  21. Acknowledgments Tom Chalfant Dr. Nate Delson • Dr. Nathan Delson – Instructor, Mechanical Engineer • Dr. Eric Lauga – Project Sponsor, Mathematician • Chris Cassidy – Design Studio Manager, Development Engineer • AnneTatlock – Faculty Assistant • TomChalfant – Machine Shop Manager, Development Engineer • SteveRoberts – Electronics Lab Manager, Development Engineer • DamonLemmon – Teaching Assistant, UCSD Graduate Student • ShawnThomson – Application Engineer, MicroMo Electronics • Dave Lischer – Project Design Lab Manager, Development Engineer Dr. Eric Lauga Chris Cassidy Bryan Dave Lischer • Bryan

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