Presented to: Committee for the Study of a Motor Vehicle Rollover Rating System May, 29 2001
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Transcript of Presented to: Committee for the Study of a Motor Vehicle Rollover Rating System May, 29 2001
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Presented to:Presented to:Committee for the Study of a Motor Committee for the Study of a Motor
Vehicle Rollover Rating SystemVehicle Rollover Rating SystemMay, 29 2001May, 29 2001
Collection of NASS CDS Data Relating to Rollover
Robert Woodill – Veridian EngineeringJohn Brophy – NHTSA
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NASS CDS Rollover VariablesNASS 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.
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NASS CDS Rollover Variables NASS CDS Rollover Variables (continued)(continued)
CDS Data Collection Screen
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NASS CDS Rollover Variables NASS CDS Rollover Variables (continued)(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
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NASS CDS Rollover Variables NASS CDS Rollover Variables (continued)(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
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NASS CDS Rollover Variables NASS CDS Rollover Variables (continued)(continued)
Element Attributes (continued)
•Most Popular One is the:
Cherry Turn-Over:
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NASS CDS Rollover Variables NASS CDS Rollover Variables (continued)(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.
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Trip-OverTrip-Over
Example 1: Vehicle lateral motion is resisted by opposing force (curb) at wheels, inducing roll moment.
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Trip-Over Trip-Over (continued)(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.
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RightRight RightRight Rear Rear FrontFront
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Trip-Over Trip-Over (continued)(continued)Example 3: Vehicle lateral motion is resisted by opposing force (surface friction)at wheels, inducing roll moment. Wheelsdig into soft soil causing trip.
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Trip-Over Trip-Over (continued)(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.
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RightRight RightRight Rear Rear FrontFront
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LeftLeft Left Left FrontFront RearRear
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GuardrailTaper
Flip-OverFlip-OverExample 1: Forward moving vehicle is vigorously rotated about its longitudinal axis by a ramp like object such as a guard rail taper.
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Flip-Over Flip-Over (continued)(continued)
Example 1: Forward moving vehicle is vigorously rotated about its longitudinal axis by a ramp-like object such as a steep embankment.
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Turn-OverTurn-Over
Centrifugal forces from a sharply turning or rotating vehicle produce a rollover moment when resisted by surface friction
No Gouges, and NoRight Side Rim Damage
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Turn-OverTurn-Over ??
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Roof & Left Roof & Left Side Side
DamageDamage
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Left Side Wheel DamageLeft Side Wheel Damage
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Left Rear Wheel DamageLeft Rear Wheel Damage
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Turn-Over or Trip-OverTurn-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.
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Climb-OverClimb-Over
Vehicle climbs up and over a fixed object such as a barrier or guardrail
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Fall-OverFall-Over
Vehicle is tipped by slope so that its center of gravity is outboard of its wheels.
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Fall-Over?Fall-Over?
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Fall-Over or Trip-Over?Fall-Over or Trip-Over?
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Left Side Wheel DamageLeft Side Wheel Damage
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Close-up LF Wheel DamageClose-up LF Wheel Damage
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Fall-Over or Trip-Over?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
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Bounce-OverBounce-Over
Vehicle rebounds off fixed object (such as a guardrail), and overturns as a consequence
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Instead of rebounding, the vehicle climbs over the fixed object (such as a guardrail), and overturns on the opposite side
However, IfHowever, If
It becomes a?Climb-Over
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Impact With Another Impact With Another VehicleVehicle
Rollover is the immediate result of an impact with another vehicle.
Momentum from the impact causes vehicle to turn-over, no tripping is involved
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Vehicle Impact Vehicle Impact or or
Trip-OverTrip-Over
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RightRight Right RightRearRear Front Front
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Left Side Roll DamageLeft Side Roll Damage
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Roll and LR Wheel DamageRoll and LR Wheel Damage
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Roll and LF Wheel DamageRoll and LF Wheel Damage
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Left FrontLeft Front Left RearLeft Rear
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Vehicle Impact or Trip-OverVehicle Impact or Trip-Over
• Vehicle/vehicle impact was the impetus to send this vehicle into curb but,
• The curb impact was the initiator for the rollover and thus this is a TRIP-OVER.
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Tripped or Untripped?Tripped or Untripped?
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Left FrontLeft Front Left RearLeft Rear
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ConclusionConclusion
• Scrutiny of both scene evidence and vehicle damage -- especially the wheels is critical.
• Close-up images of the wheels are very important.
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QuestionsQuestions