Updated Version of GTR9-1-07r1. March 28-29, 2012 Japan Automobile Standards Internationalization Center (JASIC) 1

Transcription

1 Informal Group on GTR9 Phase2 (IG GTR9-PH2) 2 nd Meeting Technical Discussion Benefit Updated Version of GTR9-1-07r1 March 28-29, 2012 Japan Automobile Standards Internationalization Center (JASIC) 1

2 Outline 1. Anticipated Factors for Enhanced Injury Mitigation 2. Estimation of Reduction due to Tibia Fracture Mitigation 3. Summary 2

3 1. Anticipated Factors for Enhanced Component Level Injury Mitigation - Improved Biofidelity - Tibia 4. Comparison of Component Responses Moment (Nm) Flex-GT (test 1) Flex-GT (test 2) PMHS Corridor (upper) PMHS Corridor (lower) TRL(calculated value) - Tibia Bending - TEG Flex-GT (test 1) Flex-GT (test 2) 550 PMHS Corridor (upper) 500 PMHS Corridor (lower) TRL (from corridor) 450 Knee GTR9-1-07r1 4. Comparison of Component Responses - Knee Bending - Moment (Nm) TEG Deflection (mm) Flex-PLI tibia response characteristics are much closer to those of human compared to TRL legform Tibia Knee angle (deg.) Flex-PLI knee joint is stiffer than that of human Flex-PLI stiffness is much more comparable to human stiffness than TRL legform Knee (ACL) Assembly Level 5. Correlation of Assembly Impact Responses el /s 2 ) TRL Legform Mode Upper Tibia Accel. (m/ CAE Correlation Study - Correlation of Tibia Injury Measures TRL Legform Flex-PLI y = x R = Human Model Tibia Bending Moment (Nm) Konosu et al. (2009) (Nm) Flex-PLI Model Tibia Bending Moment TEG-096 (Flex-PLI) y = 1.259x R = Human Model Tibia Bending Moment (Nm) No correlation between TRL legform upper tibia acceleration and human tibia bending moment Good correlation between Flex-PLI and human tibia bending moment Reference : Konosu, A. et al., Evaluation of the Validity of the Tibia Fracture Assessment Using the Upper Tibia Acceleration Employed in the TRL Legform Impactor, IRCOBI Conference (2009) 5. Correlation of Assembly Impact Responses - CAE Correlation Study - Correlation of ACL Injury Measures m) TRL Legform Model Knee Shear Displacement (mm TRL Legform y = x R = 0.13 Flex-PLI Model ACL Elongation (mm) Flex-PLI y = x R = Human Model ACL Elongation (mm) Human Model ACL Elongation (mm) No correlation between TRL legform knee shear displacement and human ACL elongation Good correlation between Flex-PLI and human ACL elongation

4 1. Anticipated Factors for Enhanced TRL Legform Injury Criterion Upper Tibia Acceleration Injury Mitigation - Enhanced Injury Assessment Capabilities - Knee center 64 mm Tibia Flex-PLI Injury Criteria Femur-3 BM Femur-2 BM Femur-1 BM 217 mm 137 mm 297 mm Upper end of tibia Individual Measurement Bending Angle Knee GTR9-1-07r1 Injury Criteria Femur-3 BM Femur-2 BM Femur-1 LCL MCL BM Knee-ACL PCL ACL EL Knee-PCL Disp. EL Shearing force Bending force + Knee-MCL EL Shear Tibia-1 BM 134 mm Tibia-1 BM No instrumentation Tibia-2 BM Tibia-3 BM Tibia-4 BM 214 mm 294 mm 374 mm Tibia-2 BM Tibia-3 BM Tibia-4 BM Combination BM: Bending Moment EL: Elongation Wider coverage of tibia fracture Use of bending moment that best describes human tibia fracture Flex-PLI ligaments elongate due to combined knee loading Use of ligament elongation provides better correlation with human injuries 4

5 1. Anticipated Factors for Enhanced Injury Mitigation - Otte et al. (2007) - GTR9-1-07r GIDAS data 143 pedestrians with leg fractures (tibia/fibula) documented by X-rays Reference: Otte, D., Haasper, C., Characteristics on Fractures of Tibia and Fibula in Car Impacts to Pedestrians Influences of Car Bumper Height and Shape, IRCOBI Conference (2007) 5

6 1. Anticipated Factors for Enhanced Injury Mitigation - Otte et al. (2007) - GTR9-1-07r1 Fracture location was identical to the bumper height only in 17.5 % of the cases 82.5% of fractures are presumed to be due to indirect loading Reference: Otte, D., Haasper, C., Characteristics on Fractures of Tibia and Fibula in Car Impacts to Pedestrians Influences of Car Bumper Height and Shape, IRCOBI Conference (2007) 6

7 1. Anticipated Factors for Enhanced Ankle/Foot Injury 6% Injury Mitigation - Japanese In-depth Accident Data (ITARDA) - Bumper Load Femur Fracture 8% Patella Fracture 2% Leg Fracture at Bumper 14% Knee Ligament Damage 6% Knee Bending Angle GTR9-1-07r1 TRL Legform Knee Shear Disp. Upper Tibia Accel. Bending Leg Fracture Away from Bumper 65% Knee Ligament Elongation Flex-PLI References: (1) FY2005 ITARDA Report : Investigation of Vehicle Safety Measures by Accident Reconstruction, ITARDA (2006) (in Japanese) (2) Otte et al., Characteristics on Fractures on Tibia and Fibula in Car Impacts to Pedestrians Influence of Car Bumper Height and Shape, IRCOBI (2007) Tibia Bending Moment Most significant improvement is with leg fracture mitigation 7 Tibia-1 Tibia-2 Tibia-3 Tibia-4

8 Pedestrians Sustaining Tibia Fracture by MAIS Fatality Ratio by MAIS GTR9-1-07r1 - Estimated Reduction in Annual Medical (US, JPN) - MAIS Total PCDS, age > 15 with Tibia Fracture without Tibia Fracture Fatality MAIS Ratio 2 1.0% 3 5.3% % % % Reference : Goertz A., Accident Statistical Distributions from NAS CDS, SAE Paper # (2010) Percentage of Tibia Fracture by Injury Severity With Tibia Fracture (%) Without Tibia Fracture (%) Fatal 32.7% 67.3% Severe 22.6% 77.4% Minor 0.0% 100.0% 8

9 GTR9-1-07r1 - Estimated Reduction in Annual Medical (US, JPN) - Percentage of Tibia Fracture by Injury Severity With Tibia Fracture (%) Without Tibia Fracture (%) Fatal 32.7% 67.3% Severe 22.6% 77.4% Minor 0.0% 100.0% Annual Medical due to Tibia Fracture Country US $ 171,901,940 JPN $ 88,010,679 Pedestrians by Injury 16YO and older 0-15YO Severity US JPN US JPN Fatal Severe Minor US Fatal : FARS US Non-fatal : NASS-PCDS (Weighed) JPN : ITARDA Average Medical per Case Tibia count AIS Weighed For Tibia Fracture = $44,684 ($1 = \80) (coverage increase) (Protection Level) Annual Medical Reduction from Country US $ 99,273,370 JPN $ 50,826,167 9

10 - Overview of Estimation Procedure - Pedestrians Sustaining Tibia Fracture by MAIS Percentage of Tibia Fracture by Pedestrians with Tibia Fracture by per Case In-depth accident data Multiply Fatality Ratio by MAIS Pedestrians by National accident statistics Annual due to Tibia Fracture Multiply Coverage Increase by Introducing FlexPLI Protection Level Annual Reduction from Annual Reduction from by Introducing FlexPLI 10

11 - Overview of Estimation Procedure - Pedestrians Sustaining Tibia Fracture by MAIS Percentage of Tibia Fracture by Pedestrians with Tibia Fracture by per Case In-depth accident data Multiply Fatality Ratio by MAIS Pedestrians by National accident statistics Annual due to Tibia Fracture Multiply Coverage Increase by Introducing FlexPLI Protection Level Annual Reduction from Annual Reduction from by Introducing FlexPLI 11

12 - Estimation of Percentage of Tibia Fracture by - Pedestrians Sustaining Tibia FX by MAIS MAIS with Tibia FX 1 0 n 1 without Tibia FX FX: fracture Pedestrians Sustaining Tibia FX by with Tibia FX without Tibia FX MAIS Fatal Severe Minor Fatal Severe Minor 2 N 2 n n 1 3 N 3 n 3 2 N 2 xr 2 N 2 x(1-r 2 ) 0 n 2 xr 2 n 2 x(1-r 2 ) 0 4 N 4 n 4 5 N 5 n 5 3 N xr 3 3 N x(1-r ) n xr 3 3 n x(1-r ) N 6 n 6 4 N 4 xr 4 N 4 x(1-r 4 ) 0 n 4 xr 4 n 4 x(1-r 4 ) 0 5 N 5 xr 5 N 5 x(1-r 5 ) 0 n 5 xr 5 n 5 x(1-r 5 ) 0 Fatality Ratio 6 N 6 xr 6 N 6 x(1-r 6 ) 0 n 6 xr 6 n 6 x(1-r 6 ) 0 by MAIS MAIS Ratio SUM N f N s N m n f n s n m 1 R 1 2 R 2 3 R 3 4 R 4 5 R 5 6 R 6 Percentage of Tibia Fracture by with Tibia Fracture without Tibia Fracture Fatal N f /(N f + n f ) n f /(N f + n f ) Severe N s / (N s + n s ) n s / (N s + n s ) Minor N m / (N m + n m ) n m / (N m + n m ) 12

13 Pedestrians Sustaining Tibia Fracture by MAIS MAIS total US (NASS-PCDS) JPN (ITARDA) US (NASS-PCDS) Numbers Numbers age>15 with Tibia FX without Tibia FX total with Tibia FX without Tibia FX Fatality Ratio by MAIS JPN (ITARDA) age>15, collision with passenger car or wagon FX: fracture Reference : Goertz A., Accident Statistical Distributions from NAS CDS, SAE Paper # (2010) MAIS Non-fatal Fatal Fatality Ratio Raw Weighted Raw Weighted Raw Weighted % 0.1%-> 0.0% % 1.0% % 5.3% % 22.5% % 47.6% % 99.0% 13

14 - Estimated Percentage of Tibia Fracture by - Pedestrians Sustaining Tibia Fracture by MAIS US (NASS-PCDS) JPN (ITARDA) age > 15 with without with without MAIS Total Tibia Tibia Total Tibia Tibia Fracture Fracture Fracture Fracture Fatality Ratio by MAIS Fatality MAIS Ratio 2 1.0% 3 5.3% % % % Reference : Goertz A., Accident Statistical Distributions from NAS CDS, SAE Paper # (2010) Percentage of Tibia Fracture by US JPN Injury Severity With Tibia Fracture (%) Without Tibia Fracture (%) With Tibia Fracture (%) Without Tibia Fracture (%) Fatal 32.7% 67.3% 12.9% 87.1% Severe 22.6% 77.4% 19.4% 80.6% Minor 0.0% 100.0% 0.0% 100.0% 14

15 - Overview of Estimation Procedure - Pedestrians Sustaining Tibia Fracture by MAIS Percentage of Tibia Fracture by Pedestrians with Tibia Fracture by per Case In-depth accident data Multiply Fatality Ratio by MAIS Pedestrians by National accident statistics Annual due to Tibia Fracture Multiply Coverage Increase by Introducing FlexPLI Protection Level Annual Reduction from Annual Reduction from by Introducing FlexPLI 15

16 US Injury Severity - Pedestrians by - 16 YO and older 0-15 YO Fatal was derived from FARS(2009) Fatal Severe Severe and Minor was Minor derived from NASS-GES (2009) NASS-GES data NASS-GES Variable: INJSEV 16 YO and older 0-15 YO Case Weighted case Case Weighted case No Injury (O) Possible Injury (C) Non-incapacitating Evident Injury (B) Number for Minor Injury Incapacitating Injury (A) Fatal Injury (K) Number for Severe Injury JPN Injury 16 YO and 0-15 YO All of Japanese data were derived from ITARDA (2009) Severity older Fatal: Died within 24 hours from accident Fatal Severe: Injury that requires 30 days or more for cure Severe Minor : injury that requires less than 30 days for cure Minor

17 - Overview of Estimation Procedure - Pedestrians Sustaining Tibia Fracture by MAIS Percentage of Tibia Fracture by Pedestrians with Tibia Fracture by per Case In-depth accident data Multiply Fatality Ratio by MAIS Pedestrians by National accident statistics Annual due to Tibia Fracture Multiply Coverage Increase by Introducing FlexPLI Protection Level Annual Reduction from Annual Reduction from by Introducing FlexPLI 17

18 - Pedestrians with Tibia Fracture by - Percentage of Tibia Fracture by Pedestrians by With Tibia Without Tibia Injury Injury 16YO and older 0-15YO Fracture (%) Fracture (%) Severity Severity US JPN US JPN US JPN US JPN Fatal Fatal 32.7% 12.9% 67.3% 87.1% Severe Severe 22.6% 19.4% 77.4% 80.6% Minor Minor 0.0% 0.0% 100.0% 100.0% US Fatal : FARS US Non-fatal : NASS-GES (Weighed) JPN : ITARDA Pedestrians with Tibia Fracture by Injury 16YO and older 0-15YO Severity US JPN US JPN Fatal Severe Minor

19 - Overview of Estimation Procedure - Pedestrians Sustaining Tibia Fracture by MAIS Percentage of Tibia Fracture by Pedestrians with Tibia Fracture by per Case In-depth accident data Multiply Fatality Ratio by MAIS Pedestrians by National accident statistics Annual due to Tibia Fracture Multiply Coverage Increase by Introducing FlexPLI Protection Level Annual Reduction from Annual Reduction from by Introducing FlexPLI 19

20 - per Case (US) - per case for MAIS 2 and 3 injuries 20

21 Injury Level - per Case (US) - per Case by MAIS (NHTSA,2002) Economic Human Property Company Public Agency Intangible Consequences Comprehensive MAIS 2 $47,964 $3,954 $1,953 $12,948 $91,137 $157,956 MAIS 3 $139,024 $6,799 $4,266 $36,009 $128,107 $314,205 Pedestrians Sustaining Tibia Fracture by AIS (NASS-PCDS, age>15) MAIS count Weighted per Case Economic Human Property Company Public Agency Intangible Consequences Comprehensive $126,464 $6,407 $3,947 $32,828 $123,008 $292,654 21

22 Injury Level - per Case (JPN) - Unpublished data for average human cost by MAIS Based on Japanese insurance data Human cost only per Case by MAIS Exchange rate used : $1=107.4 Economic Human Property Company Public Agency Intangible Consequences Comprehensive MAIS 2 $16,760 N/A N/A N/A N/A N/A MAIS 3 $38,175 N/A N/A N/A N/A N/A fpedestrians ti Sustaining Tibia Fracture by AIS (NASS-PCDS, age>15) MAIS count Weighted per Case Economic Human Property Company Public Agency Intangible Consequences Comprehensive $24,650 N/A N/A N/A N/A N/A 22

23 Definition - per Case Comparison - Economic Human Property Company Medical Market Productivity Household Productivity Property Damage Workplace s Public Agency Emergency Services Insurance Administration Legal s Travel Delay Intangible Consequences QALYs Comprehensive Sum of Economic and Intangible Consequence US $126,464 $6,407 $3,947 $32,828 $123,008 $292,654 JPN $24,650 N/A N/A N/A N/A N/A Breakdown of Human Medical Human Market Productivity Household Productivity US $42,237 $65,049 $19,178 JPN $24,650 QALY : Quality-Adjusted Life Years lost 23

24 - Overview of Estimation Procedure - Pedestrians Sustaining Tibia Fracture by MAIS Percentage of Tibia Fracture by Pedestrians with Tibia Fracture by per Case In-depth accident data Multiply Fatality Ratio by MAIS Pedestrians by National accident statistics Annual due to Tibia Fracture Multiply Coverage Increase by Introducing FlexPLI Protection Level Annual Reduction from Annual Reduction from by Introducing FlexPLI 24

25 - Estimated Annual due to Tibia Fracture - Pedestrians with Tibia Fracture by Injury 16 YO and older Severity US JPN Fatal Severe Minor 0 0 Country per Case Economic Intangible Consequences Comprehensive US $169,646 $123,008 $292,654 JPN $24,650 N/A N/A JPN: Economic includes Human only Annual due to Tibia Fracture Country Economic Intangible Consequences Comprehensive US $652,628,162 $473,211,776 $1,125,839,938 JPN $36,555,950 N/A N/A JPN: Economic includes Human only 25

26 - Overview of Estimation Procedure - Pedestrians Sustaining Tibia Fracture by MAIS Percentage of Tibia Fracture by Pedestrians with Tibia Fracture by per Case In-depth accident data Multiply Fatality Ratio by MAIS Pedestrians by National accident statistics Annual due to Tibia Fracture Multiply Coverage Increase by Introducing FlexPLI Protection Level Annual Reduction from Annual Reduction from by Introducing FlexPLI 26

27 - Estimated Annual Reduction - Country Protection Level Annual due to Tibia Fracture Economic Intangible Consequences Comprehensive US $652,628,162 $473,211,776 $1,125,839,938 JPN $36,555,950 N/A N/A JPN: Economic includes Human only Coverage increase relative to TRL legform Otte et al. (2007) : Tibia fracture due to indirect loading = 82.5% Coverage Increase by Introducing FlexPLI 07 Protection Level by complying with injury 0.7 thresholds that correspond to 30% injury probability Annual Reduction from by Introducing FlexPLI Country Economic Intangible Comprehensive Consequences US $376,892, $273,279, $650,172, JPN $21,111,061 N/A N/A JPN: Economic includes Human only 27

28 - Comparison with Previous Results - JPN Previous per Case # Ped Ann. w/tib Human Property Company Public Intangible Total Fx Tib Fx $44,684 N/A N/A N/A N/A $44, $88M Coeff *0.7 JPN $24,650 N/A N/A N/A N/A $24, $37M Current *0.7 US Previous US Current $44,684 Not Included Not Included Not Included Not Included $44, $172M $126,464 $6,407 $3,947 $32,828 $123,008 $292, $1,126M * *0.7 Benefit $51M $21M $99M $650M 28

29 3. Summary The Flex-PLI provides improved biofidelity of the tibia and knee at both assembly and component levels Accident data show that tibia fracture is most frequent in pedestrian severe (AIS 2+) injuries Most significant factor that would contribute to injury mitigation is enhanced biofidelity of the tibia and much wider coverage of injury measurements over the tibia Additional annual cost reduction due to tibia fracture mitigation by introducing the Flex-PLI was estimated to be approximately $377M of Economic and $650M of Comprehensive in the US, relative to the use of TRL legform Japan data could not be processed in the same way as performed with the US data due to the lack of information may require further study 29

30 References Otte, D., Haasper, C., Characteristics on Fractures of Tibia and Fibula in Car Impacts to Pedestrians Influences of Car Bumper Height and Shape, IRCOBI Conference (2007) FY2005 ITARDA Report : Investigation of Vehicle Safety Measures by Accident Reconstruction, ITARDA (2006) (in Japanese) Goertz A., Accident Statistical Distributions from NAS CDS, 2010 SAE World Congress, SAE Paper Number (2010) NHTSA, The Economic Impact of Motor Vehicle Crashes 2000, DOT HS (2002) 30

31 Thank you for your attention 31