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Development and Redevelopment of a More Realistic Sailing Dinghy Simulator

Development and Redevelopment of a More Realistic Sailing Dinghy Simulator

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Development and Redevelopment of a More Realistic Sailing Dinghy Simulator

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  1. Development and Redevelopment of a More Realistic Sailing Dinghy Simulator Jonathan R. Binns, Australian Maritime College, Frank W. Bethwaite, Bethwaite Design Pty Ltd, Norman R. Saunders, University of Melbourne, Mark Habgood, University of Melbourne

  2. Development of the Simulator • Began as a “marine treadmill”, studying athletes’ performance • University of Tasmania developed a system • Virtual Sailing redesigned and rebuilt the hardware • VS1 • Virtual Sailing and the Australian Maritime College rewrote the software • VS2 • VS and AMC redesigned hardware • VS-C1

  3. The old software and hardware VS1

  4. The New SoftwareVS2

  5. New Software and HardwareVS-C1

  6. New hardware eliminated this What is the Simulator? • A “human-in-the-loop” sailing simulation

  7. OLD Simulator Hardware VS1, VS2 • Boat in a roll frame • Pneumatic rams and pressure regulators • Transducers • Data acquisition

  8. NEW Simulator Hardware !! VS-C1 • Cockpit/boat in a roll swing • Pneumatic ram and pressure regulators • Encoders • Data acquisition

  9. New to old software • Cost ~$60k • Modular design allows for program to be changed • Strict separation of program elements allows development of program without secondary influences • Revisions can be backwardly compatible

  10. New to old hardware • >$10k saving, >100 kg weight saving, <0.5 x size • Faster data rates (9.6k bps -> 33k bps, still very low) • All three transducers are the same, none require calibration ever • Lost ability to provide programmable tiller feedback

  11. The Old Simulator VS1

  12. The New Simulator VS-C1

  13. Some Simulator Uses • Entry level training • Higher level fitness and skill evaluation and sports’ specific exercise programs • Training during poor weather • Fun • “Try-before-you-buy” programs for potential buyers, leading to happier clients and selling more boats

  14. Skills required to make a simulator • Programming – high level of efficient graphics and easy simulation • Data acquisition and control – large cost savings and speed advances possible • Mechanical design – simple tough mechanisms used throughout • Simulation – efficient and quick algorithms to provide correct dynamic feel

  15. THE Force and Moment Balance • Essentially 4 degree of freedom (surge, sway, heel and yaw) • Done in time domain, results in F=ma, M=I, simple explicit Euler step used • Dynamics are assumed Eulerian (but should be Lagrangian!!!) • Simple force/moment decomposition with 3D vectors makes for realistic feel

  16. Some Problems with the Old Software • Righting moment had a few bugs & did virtually nothing • No transverse force balance • Yaw moment balance had no real physical link • Rendering was quite clumsy • All drag elements were too high • meant all boat speeds were very slow

  17. Upright Drag

  18. Sail Lift

  19. Sail Drag

  20. Centreboard Lift

  21. Centreboard Drag

  22. Polar Comparison, Old to New program

  23. Basic Sim Data

  24. Extra Sim Data

  25. The New Boats, the Optimist

  26. The New Boats, the Byte

  27. The New Boats, the Laser, 3 sail options

  28. The MegaByte, and The Liberty (a two sail boat!!)

  29. Polar Comparison, New Boats

  30. Conclusions from Upgrades • Steady state performance prediction greatly improved • Dynamic performance prediction greatly improved • Modular coding allows for many different upgrade possibilities • Hardware refinements have saved 30% off cost price and made better machine • Sailing industry has an alternative

  31. Conclusions from Engineer’s Perspective • A yacht designer has to do everything • MUST consider technologies/methods outside naval architecture • Approximations can be massive, but usefulness of predictions can still be high • Little can be achieved with non-scientific basis

  32. Future developments • More training tools • More multiple sail dinghies • Better dynamic prediction for apparent wind sailing

  33. Simulator can be used by anyone

  34. Exercise • Alter simulation parameters to make dinghy as fast as possible in 12 knots TWS • Teach someone to sail • See which boat is fastest, and think why?

  35. Sailing = Glamourtake advantage, don’t get fooled