update on nhtsa's oblique research programsae international current research objective ......
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UPDATE ON NHTSA'S OBLIQUE RESEARCH PROGRAM
James SaundersDan ParentNational Highway Traffic Safety Administration
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AGENDA
• BACKGROUNDNHTSA Oblique RMDB ProcedureIIHS Small Overlap Procedure
• FINDINGS TO DATE• CURRENT RESEARCH
ObjectiveAdditional Vehicle TestsNew Methodologies
• RESULTSVehicle ResponseOccupant Response
• CONCLUSIONS• NEXT STEPS
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BACKGROUND – NHTSA OBLIQUE RMDB
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RMDB Speed 56 mph (90 kph)
Overlap 35 percent
Impact Angle 15 degrees (PDOF = 345)
Occupants Near-side(Driver)
THOR Mod Kit 50th Male
Far-side(Passenger)
THOR Mod Kit 50th Male
Research Moving Deformable Barrier (RMDB)
Near-Side Occupant
Far-Side Occupant
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BACKGROUND – IIHS SMALL OVERLAP
• IIHS TOP SAFETY PICK+ RATING CRITERIA
Top Safety Pick andOverall rating of “Good” or “Acceptable” in IIHS Small Overlap ImpactNew for 2014 Top Safety Pick+: vehicle must have basic, advanced or superior rating for front crash prevention
• IIHS SMALL OVERLAP IMPACT RATING CRITERIA
OverallStructuralHead/NeckChestKnee/ThighLeg/FootKinematics
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40 mph
25% Overlap
Rigid Barrier
150 mmRadius
HIII 50th
Male
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NHTSA OBLIQUE FINDINGS TO DATE
• OBLIQUE RMDB TESTS18 vehicle tests to date, two occupants in each vehicle
• 2012 SAE WORLD CONGRESSOblique test procedure representative of vehicle-to-vehicle crash test
• 2013 SAE WORLD CONGRESSOblique test procedure is repeatable
• 2013 ESVNewer, high sales volume vehicles show similar injury risk trends to previous test vehiclesFar-side occupant response demonstrated high head rotational velocity with high brain injury risk (BrIC)
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CURRENT RESEARCH OBJECTIVE
• QUESTIONWould vehicles that perform well in the IIHS Small Overlap test procedure require additional countermeasures to perform well in the NHTSA Oblique RMDB test procedure?
• APPROACHTest five vehicles that achieved an IIHS Top Safety Pick+ designation in the NHTSA Oblique RMDB test procedure
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NHTSA TEST # YEAR MAKE MODEL
TEST WEIGHT (KG) VEHICLE CLASS
8477 2013 Honda Civic 1544 Small PC8089 2013 Hyundai Elantra 1590 Small PC8476 2013 Dodge Dart 1738 Small PC8488 2012 Volvo S60 N/A Midsize PC8478 2014 Subaru Forester 1803 Small SUV8475 2013 Volvo XC60 2153 Midsize SUV
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UPDATES TO OCCUPANT RESPONSE METHODOLOGY
• TEST DEVICESBoth THOR ATDs updated to newest Mod Kit design level including w/SD-3 shoulder
• INJURY CRITERIAUpdated BrIC methodology applied
• Takhounts, 2013 StappUpdated thoracic injury criterion applied
• See G105 Biomechanics, “4-Point Thoracic Injury Criteria for THOR”
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Group Name TSP+ Non-TSP+Description Vehicles that achieved an IIHS
Top Safety Pick+ designation for their given model year
Vehicles that did not achieve aIIHS Top Safety Pick+designation for their given model year
* Note that several vehicle model years were tested before TSP+ designation was developed
Number of Vehicles 5 14Number of Near-sideOccupants
5 14
Number of Far-sideOccupants
5 8
RESULTS: METHODOLOGY
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RESULTS: VEHICLE RESPONSE
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RESULTS: NEAR-SIDE OCCUPANT RESPONSE
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RESULTS: FAR-SIDE OCCUPANT RESPONSE
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EXAMPLE CHART
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0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
160.00
180.00
200.00
TSP+(N=5)
NOT TSP+(N=14)
Varia
ble
Variable
TTest (<.05 StatisticallySignificantDifference)
MeanMean S.D.
Mean + S.D.
Value
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INTRUSION MEASUREMENTS
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TOEPAN INTRUSIONS
14
0
20
40
60
80
100
120
140
160
180
200
TSP+(N=5)
NOT TSP+(N=14)
Toep
an A
1
0
50
100
150
200
250
TSP+(N=5)
NOT TSP+(N=14)
Toep
an B
1 *
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TOEPAN INTRUSIONS
15
0
50
100
150
200
250
TSP+(N=5)
NOT TSP+(N=14)
Toep
an C
1
0
50
100
150
200
250
TSP+(N=5)
NOT TSP+(N=14)
Toep
an D
1
*
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STEERING WHEEL (SW) Y AND Z
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-10
0
10
20
30
40
50
60
70
80
TSP+(N=5)
NOT TSP+(N=14)
SW Y
0
20
40
60
80
100
120
140
TSP+(N=5)
NOT TSP+(N=14)
SW Z
*
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LEFT AND RIGHT INSTRUMENT PANEL (IP)
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0
20
40
60
80
100
120
140
TSP+(N=5)
NOT TSP+(N=14)
Left
IP
Left IP
-10
10
30
50
70
90
110
130
TSP+(N=5)
NOT TSP+(N=14)
Rig
ht IP
Right IP
*
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0.00
0.50
1.00
1.50
2.00
2.50
3.00
Near-sideTSP+(N=5)
Near-sideNon-TSP+
(N=14)
Far-sideTSP+(N=5)
Far-sideNon-TSP+
(N=8)
Brain Injury Risk (BrIC)
0.00
0.50
1.00
1.50
2.00
Near-sideTSP+(N=5)
Near-sideNon-TSP+
(N=14)
Far-sideTSP+(N=5)
Far-sideNon-TSP+
(N=8)
Head Injury Risk (HIC15)
PRELIMINARY OCCUPANT INJURY RISK
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For the far side occupant, brain injury risk predicted using BrIC is on average higher for TSP+ vehicles than for Non-TSP+ vehicles but not statistically-significant
Mea
n IA
V /
Pro
visi
onal
IAR
V Head Injury Risk (HIC15)Provisional IARV =11% Risk of AIS 3+
Brain Injury Risk (BrIC)Provisional IARV =50% Risk of AIS 3+
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0.00
0.50
1.00
1.50
2.00
Near-sideTSP+(N=5)
Near-sideNon-TSP+
(N=14)
Far-sideTSP+(N=5)
Far-sideNon-TSP+
(N=8)
Chest Injury Risk (Peak Resultant Deflection)
PRELIMINARY OCCUPANT INJURY RISK
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No statistically-significant differences in chest injury risk between TSP+ and Non-TSP+
Mea
n IA
V /
Pro
visi
onal
IAR
V Chest Injury Risk (Peak Resultant Deflection)Provisional IARV =
50% Risk of AIS 3+ for 45-year-old
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0.00
0.50
1.00
1.50
2.00
Near-sideTSP+(N=5)
Near-sideNon-TSP+
(N=14)
Far-sideTSP+(N=5)
Far-sideNon-TSP+
(N=8)
Acetabulum Injury Risk (Peak Resultant Force)
Near-sideTSP+(N=5)
Near-sideNon-TSP+
(N=14)
Far-sideTSP+(N=5)
Far-sideNon-TSP+
(N=8)
Femur Injury Risk(Peak Axial Force)
PRELIMINARY OCCUPANT INJURY RISK
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No statistically-significant differences in acetabulum, femur, or tibia injury risk between TSP+ vehicles and Non-TSP+ vehicles
Mea
n IA
V /
Pro
visi
onal
IAR
V
Near-sideTSP+(N=5)
Near-sideNon-TSP+
(N=14)
Far-sideTSP+(N=5)
Far-sideNon-TSP+
(N=8)
Tibia Injury Risk(Revised Tibia Index)
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OBSERVATIONS
• TOP SAFETY PICK+ VEHICLES IN NHTSA OBLIQUE
Less intrusion (some statistically significant)• Average interior intrusion points were smaller for the TSP+
when compared Non-TSP+, except for SW YSimilar injury risk (none statistically significant)
• Even with interior intrusion being less for TSP+ there were no statistically-significant differences in injury risk between TSP+ and non-TSP+ groupsSome vehicles that perform well in the IIHS Small
Overlap frontal impact test may require additional countermeasures in the NHTSA Oblique test mode
• LIMITATIONSPreliminary dataRelatively small sample size (N=5 vs N=14)
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NEXT STEPS
• PUBLISH TEST DATA AND REPORTS – 2014
• NHTSA AGENCY DECISION – 2014
• LOAN AGREEMENTAn agreement is place to allow manufacturers to perform Oblique and Small Overlap testing
• RMDB only• RMDB and THOR ATD(s)
Allows manufacturers to gain experience and provide feedback on NHTSA’s Small Overlap/Oblique test proceduresContact James Saunders ([email protected])
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