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Contents of Headform Test Procedure

This study outlines the headform test procedure for various vehicle shapes, including sedans, SUVs, and one-box types. It discusses classification, determination criteria, and computer simulation parameters. The analysis covers effective head mass at impact, head impact speed ratios, impact angles for adults and children, and relief ratios of boundary line methods. The study compares vehicle shapes from Australia, the USA, and Europe, highlighting differences in dimensions and classifications.

jeffreyhayes
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Contents of Headform Test Procedure

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  1. Contents of Headform Test Procedure • Vehicle Shape • Vehicle Shape Classification • Vehicle Shape Determination • Parameters for Computer Simulation • Effective Head Mass at Impact • Head Impact Speed Ratio for Bonnet • Head Impact Speed Ratio for Windshield • Bonnet Impact Angle for Adult & Child • Windshield Impact Angle for Adult & Child • Relief Ratio of Boundary LineMethod Comparing with Overlap Method

  2. 1. Vehicle Shape • Two sedans (HOLDEN COMMODORE, FORD FALCON) provided from Australia, and four sedans and three SUVs provided from USA are not included in this table.

  3. 1-1. Vehicle Shape （Small & 1Liter Car） Ref. : PS152,153,155.

  4. 1-2. Vehicle Shape (Sedan ＆ Wagon) Ref. : PS152,153,155.

  5. 1-3. Vehicle Shape (SUV) Ref. : PS152,153,155.

  6. 1-4. Vehicle Shape (Sport Type) Ref. : PS152,153,155.

  7. 1-5. Vehicle Shape (One Box) Ref. : PS152,153,155.

  8. 1-6. Vehicle Shape Provided By US < IHRA PS153-2 >

  9. 1-7. Vehicle Shape Provided By EU < IHRA PS153 > Sedan + Light vehicle + Sport type

  10. KA FOCUS 1-8. Vehicle Shape Provided By EU < IHRA PS153 > Sedan + Light vehicle + Sport type PUMA MONDEO

  11. FIESTA PEUGEOT 306 COUGAR PEUGEOT 406 COUPE PEUGEOT 607 1-9. Vehicle Shape Provided By EU Sedan + Light vehicle + Sport type < IHRA PS153 >

  12. CITOEN XSARA PEUGEOT 106 PEUGEOT 406 CITROEN XANTIA CITOEN XSARA PICASSO CITROEN SAXO 1-10. Vehicle Shape Provided By EU Sedan + Light vehicle + Sport type < IHRA PS153 >

  13. 1-11. Vehicle Shape Provided By Australia Sedan + Light vehicle + Sport type < IHRA PS155 > 3 0 0 0 a. HOLDEN COMMODORE b. FORD FALCON 2 0 0 0 Height (mm) 1 0 0 0 b a 0 0 1 0 0 0 2 0 0 0 3 0 0 0 4 0 0 0 5 0 0 0 L e n g t h ( m m )

  14. 2. Vehicle Shape Classification < IHRA PS152 > Boundary of LEH :835mm (839mm+832mm) / 2 Whole shape is different. Keep the IHRA computer simulation results as it is.

  15. 3. Vehicle Shape Determination • Order of determination 1st. Bonnet angle > 30°→Category Z (≒ One Box) 2nd. BLE height > 835mm →Category Y (≒ SUV) BLE height < 835mm →Category X (≒ Sedan) (835mm: Boundary of BLE height)

  16. 4. Parameters for Computer Simulation < IHRA PS215 > ○WP1-ST1 ●WP1-ST2 △WP2-ST1 ▲WP2-ST2 □WP3-ST1 ■WP3-ST2

  17. 5. Effective Head Mass at Impact <IHRA/PS167> Effective head mass varies significantly according to the impact conditions such as vehicle shape, stiffness, walking stance and so on. Average effective head mass ≒ Head mass Adult head: 4.5 kg (Ref. IHRA/PS150, ISO/N354) Child head: 3.5 kg (Ref. IHRA/PS178, SAE973317) <IHRA/PS178, SAE973317> * 3-Year Child Head Mass = 2.7 kg 　　 * 6-Year Child Head Mass = 3.5 kg 　　 * 5th % Adult Female Head Mass = 3.6 kg

  18. 6. Head Impact Speed Ratio for Bonnet Round number = 0.8 for all vehicle shape < IHRA PS237 >

  19. 7. Head Impact Speed Ratio for Windshield < IHRA PS237 > Round number = 0.8 for all vehicle shape

  20. 8-1. Bonnet Impact Angle for Adult & Child < IHRA PS237 > Windshield Impact Angle is used. 65° 50° 90° Average the values of bonnet contact and BLE/Grille Contact 65° 60° 25°

  21. 8-2. Bonnet Impact Angle for Child for 1BOX < IHRA PS237 > Child-6YO - Bonnet Contact - - BLE/Grille Contact - Average the values Child Head Bonnet Impact Angle = 25°

  22. 9. Windshield Impact Angle for Adult & Child < IHRA PS237 > 40° 40° 50° 40° 40° 50° Sedan SUV 1BOX Adult 40° 40° 50° Child 40° 40° 50°

  23. 10. Relief Ratio of Boundary LineMethod Comparing with Overlap Method <IHRA PS209> • Overlap method and boundary line method differ not significantly • Difference to the theoretical maximum of relief ratio is less than 5%

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