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Presented to: Committee for the Study of a Motor Vehicle Rollover Rating System May, 29 2001

Collection of NASS CDS Data Relating to Rollover. Presented to: Committee for the Study of a Motor Vehicle Rollover Rating System May, 29 2001. Robert Woodill – Veridian Engineering John Brophy – NHTSA. NASS CDS Rollover Variables.

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Presented to: Committee for the Study of a Motor Vehicle Rollover Rating System May, 29 2001

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  1. Collection of NASS CDS Data Relating to Rollover Presented to:Committee for the Study of a Motor Vehicle Rollover Rating SystemMay, 29 2001 Robert Woodill – Veridian Engineering John Brophy – NHTSA

  2. NASS CDS Rollover Variables A rollover is defined as any vehicle rotation of 90 degrees or more about any true longitudinal or lateral axis. The variables also attempt to identify: What initiated the rollover At what plane of the vehicle exterior the tripping force was applied and The direction of the initial roll.

  3. NASS CDS Rollover Variables (continued) CDS Data Collection Screen

  4. NASS CDS Rollover Variables (continued) • Rollover Data: • Type • Quarter Turns • Rollover Initiation: • Type • Location • Object Contacted Class • Object Contacted • Rollover Specifics: • Location on Vehicle Where Initial Tripping • Force Applied • Direction of Initial Roll

  5. NASS CDS Rollover Variables (continued) • Element Attributes: • Trip‑over • Flip‑over • Turn‑over (justify) • Climb‑over • Fall‑over • Bounce‑over • Collision with another vehicle • Other rollover initiation type (specify): • Unknown • End-over-end

  6. NASS CDS Rollover Variables (continued) • Element Attributes (continued) • Most Popular One is the: Cherry Turn-Over:

  7. NASS CDS Rollover Variables (continued) • Source for coding rollover variables in CDS NASS: • Researcher determined — primary sources are the scene and vehicle inspections. Secondary sources are photographs, police report, driver interviews, and other interviewees.

  8. Preroll Motion C U R B Trip-Over Example 1: Vehicle lateral motion is resisted by opposing force (curb) at wheels, inducing roll moment.

  9. Preroll Motion FLAT SURFACE Trip-Over (continued) Example 2: Vehicle lateral motion is resisted by opposing force (surface friction)at wheels, inducing roll moment. Tire side wall breaks down and rim gouges usually occur.

  10. Right Right Rear Front

  11. Preroll Motion SOFT SOIL Trip-Over (continued) Example 3: Vehicle lateral motion is resisted by opposing force (surface friction) at wheels, inducing roll moment. Wheels dig into soft soil causing trip.

  12. Preroll Motion INCLINE Trip-Over (continued) Example 4: Vehicle lateral motion is resisted by opposing force (surface friction) at wheels, inducing roll moment. Incline helps cause side wall to break down and rim to dig in causing trip.

  13. Right Right Rear Front

  14. Left Left Front Rear

  15. Flip-Over Example 1: Forward moving vehicle is vigorously rotated about its longitudinal axis by a ramp like object such as a guard rail taper.

  16. Flip-Over (continued) Example 1: Forward moving vehicle is vigorously rotated about its longitudinal axis by a ramp-like object such as a steep embankment.

  17. No Gouges, and No Right Side Rim Damage Turn-Over Centrifugal forces from a sharply turning or rotating vehicle produce a rollover moment when resisted by surface friction

  18. Turn-Over?

  19. Roof & Left Side Damage

  20. Left Side Wheel Damage

  21. Left Rear Wheel Damage

  22. Turn-Over or Trip-Over Heavier damage to right side of roof indicates that the left side was probably leading. Damage to left side wheels verifies that the left side was leading and that it is a Trip-Over rather than a turn-over.

  23. Climb-Over Vehicle climbs up and over a fixed object such as a barrier or guardrail

  24. Fall-Over Vehicle is tipped by slope so that its center of gravity is outboard of its wheels.

  25. Fall-Over?

  26. Fall-Over or Trip-Over?

  27. Left Side Wheel Damage

  28. Close-up LF Wheel Damage

  29. Fall-Over or Trip-Over? Note left side wheel damage Indicates that the left side was leading Verifies that this is a trip-over rather than a fall-over

  30. Bounce-Over Vehicle rebounds off fixed object (such as a guardrail), and overturns as a consequence

  31. However, If Instead of rebounding, the vehicle climbs over the fixed object (such as a guardrail), and overturns on the opposite side It becomes a? Climb-Over

  32. Impact With Another Vehicle Rollover is the immediate result of an impact with another vehicle. Momentum from the impact causes vehicle to turn-over, no tripping is involved

  33. Vehicle Impact or Trip-Over

  34. Right RightRear Front

  35. Left Side Roll Damage

  36. Roll and LR Wheel Damage

  37. Roll and LF Wheel Damage

  38. Left Front Left Rear

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