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The Role of Motion Cues in Simulation Testing
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  1. The Role of Motion Cues in Simulation Testing Gregory Davis FHWA Office of Safety RD&T

  2. FHWA Highway Driving Simulator • Saturn SL1 Car Cab • 240 Degree Cylindrical Projection Screen • 3-DOF Electrical Servo Motion Base

  3. HDS Upgrade • Current Upgrade of System Hardware and Software is in Progress • SGI Onyx Infinite Reality has been replaced with Dell PCs • One ElectroHome Projector replaced with 3 Barco Projectors • Complete upgrade will total 5 Barcos for 240 Degree Field of View (’05)

  4. Computer Hardware • 5 Dell workstations will be used to drive each projector • Dell PCs use Quadro NVIDIA FX 3000G Graphics Cards • Low Cost with High Frame Rate

  5. Projectors • 3 Barco 909 Projectors now in place • Mounted above Car Cab on Circular Gantry Frame • Ability to deliver 2048 x 1536 Resolution

  6. Motion Base • 3 Electrical Servo Motors • Capable of Pitch, Roll, and Heave • +/- 8 degrees for Pitch and Roll each, 5 degrees combined • Heave 2.5 inches at about 2-3 hz

  7. Crossbow Inertia Gyroscope

  8. Vehicle Dynamics Model • 6 DOF Equations (although capable of only 3) • Simplified model of 4 speed Auto Transmission • Tire Skid Limits on side force and braking force • Steering wheel disturbances (force feedback) • Motion Base Control • Roadway Surface Conditions

  9. Issues and Questions? Which types of experiments require motion based cues? • Studies on Braking? Reaction Time=maybe not. Brake force=yes. • Studies on lane keeping-speed = yes • Studies on roadway design or sign comprehension = maybe, depends on experimental design

  10. …And More Questions? • If motion cues are required, how much motion is needed to achieve the desired effect? • Which method of motion is more conducive to achieving accurate and reliable results in a simulator, the traditional method or the vector substitution method? (e.g. tilting the car cab down {traditional} or up {vector substitution} during vehicle braking • Does the appropriate motion contribute to or mitigate motion sickness?

  11. Finally Do we need standards for motion cues?

  12. Acknowledgements Special Thanks to: Jason Williams (AAI Eng.) John Molino (SAIC)