Effective Head Mass at ImpactIHRA/PS/167Page *
Vehicle Shape
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 Line Method Comparing with Overlap Method
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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.
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Ref. : PS152,153,155.
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Ref. : PS152,153,155.
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Ref. : PS152,153,155.
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Ref. : PS152,153,155.
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< IHRA PS153-2 >
486
490
450
461
435
516
656
829
648
690
565
839
908.3457980824
1029.133584723
899.72494396
922.0174712259
794.0618192843
1116.0178914992
1299.7005299362
1414.2218626118
1299.0474374397
1284.6367105736
1279.0496098563
1759.0207324672
Lower
Middle
Upper
BL
(mm)
105
135
239
BCH
(mm)
460
486
497
LEH
(mm)
648
656
829
486
490
450
461
435
516
656
829
648
690
565
839
908.3457980824
1029.133584723
899.72494396
922.0174712259
794.0618192843
1116.0178914992
1299.7005299362
1414.2218626118
1299.0474374397
1284.6367105736
1279.0496098563
1759.0207324672
Charts
Charts
0
0
0
0
0
0
135
239
105
115
127
127
1038.4188387399
1112.4653732495
1145.0714218689
1206.1040935887
1304.9349230523
979.2067224502
1888.8963010254
1705.1484742678
2041.5576215402
2059.9978675763
2179.455845041
1745.070513543
PL
PT
JR
486
490
450
461
435
516
656
829
648
690
565
839
908.3457980824
1029.133584723
899.72494396
922.0174712259
794.0618192843
1116.0178914992
1299.7005299362
1414.2218626118
1299.0474374397
1284.6367105736
1279.0496098563
1759.0207324672
Lower
Middle
Upper
BL
(mm)
105
135
239
BCH
(mm)
460
486
497
LEH
(mm)
648
656
829
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< IHRA PS153 >
7.bin
8.bin
9.bin
10.bin
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MONDEO
PUMA
KA
FOCUS
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< IHRA PS153 >
FIESTA
COUGAR
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< IHRA PS153 >
PEUGEOT 106
PEUGEOT 406
CITROEN XANTIA
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0
1
0
0
0
2
0
0
0
3
0
0
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
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< IHRA PS152 >
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2nd. BLE height > 835mm → Category Y ( SUV)
BLE height < 835mm → Category X ( Sedan)
(835mm: Boundary of BLE height)
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< IHRA PS215 >
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<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>
* 5th % Adult Female Head Mass = 3.6 kg
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< IHRA PS237 >
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< IHRA PS237 >
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65°
90°
65°
60°
50°
25°
< IHRA PS237 >
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Child Head Bonnet Impact Angle = 25°
- Bonnet Contact -
- BLE/Grille Contact -
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Sedan SUV 1BOX
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INF GR / PS / 58
10. Relief Ratio of Boundary Line Method 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%
MPV + SUV + Truck
0.00
1000.00
2000.00
0.001000.002000.003000.00
Lower
Middle
Upper
BL
(mm)
127
127
127
BCH
(mm)
435
475.5
516
LEH
(mm)
565
702
839