1. Japan Automobile Standards Internationalization Center (JASIC)
Study of Application of Upper Legform to TRT/Lower Threshold Deployment Impactor Test
- Update draft -
IWG-DPPS
4th meeting, Mar. 2019
Japan Automobile Standards Internationalization Center (JASIC)

2. Objective
To clarify whether upper legform impactor can be used for the deployment test at the lower threshold velocity
Approach
Clarify Impact speed at which HTD at the lower threshold velocity of deployment can be represented by upper legform impactor

3. Methodology
HBM impact simulation
Upper legform impact simulation
Impact speed: varied from 10 to 30km/h
HBM: C6Y, AF05, AM50, AM95
Impact speed: varied from 2.5 to 30km/h
Identify HTD from the peak of sensing parameter for each of impact speeds considering variation of lower threshold
Identify relationship between peak of sensing parameter and impact speed
Peak of sensing parameter
Impact speed
Equivalent impact speed of upper legform is estimated from the peak value in HBM and relationship between peak value and impact speed of upper legform

4. Simulation Condition HBM: 6YO, 5th Female, 50th male and 95th male
Car: Three real car models representing a sedan, minivan and SUV
Impact speed to HBM: 10, 15, 20, 25, 30 km/h
Impact location of HBM: lateral position of knee joint is located to the car center
Mass of upper legform: 9.5 kg (same as UN R-127)
Impact speed of upper legform: 2.5, 5, 10, 15, 20, 25, 30 km/h
Impact direction of upper legform: longitudinal direction of car
Impact location of upper legform (lateral position): car center
Impact location of upper legform (height): center of bumper reinforcement
Sensing parameter: contact force, bumper deflection and velocity change

5. Measuring point of bumper deflection and velocity change
Simulation Model
6 YO
5th Female
50th male
95th male
Upper legform
Measuring point of bumper deflection and velocity change
(surface of bumper, car center and center height of bumper reinforcement)

6. Car Models
Small Sedan
Minivan
SUV

7. Contact Force – Small Sedan
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
C6Y
4.4 15
6.8 20
9.2 25
11.2 30
13.6

8. Contact Force – Minivan
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
AF05
6.6 15
9.5 20
15.4 25
C6Y
20.2 30
22.2

9. Impact speed to HBM [km/h] Equivalent speed of upper legform [km/h]
Contact Force – SUV
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
C6Y
6.1 15
10.2 20
AF05
16.7 25
18.9 30
20.4

10. Bumper Deflection – Small Sedan
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
AF05
2.4 15
C6Y
4.7 20
7.5 25
10.3 30
14.5

11. Bumper Deflection – Minivan
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
AF05
5.2 15
8.5 20
9.2 25
12.5 30
15.1

12. Bumper Deflection – SUV
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
AF05
7.0 15
10.7 20
13.6 25
17.8 30
20.5

13. Velocity Change – Small Sedan
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
C6Y
6.3 15
10.1 20
13.6 25
17.9 30
AF05
20.8

14. Velocity Change – Minivan
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
AF05
6.9 15
10.0 20
15.0 25
18.9 30
23.0

15. Impact speed to HBM [km/h] Equivalent speed of upper legform [km/h]
Velocity Change – SUV
Impact speed to HBM [km/h]
HTD
Equivalent speed of upper legform [km/h] 10
AF05
8.2 15
AM50
12.6 20
16.7 25
AM95
22.5 30
28.3

16. Upper Legform Impact Speed to Represent HTD
Small Sedan
Car velocity [km/h]
Bumper Deflection
Contact Force
Velocity Change
HTD
Equivalent speed of upper legform [km/h] 10
AF05
2.4
C6Y
4.4
6.3 15
4.7
6.8
10.1 20
7.5
9.2
13.6 25
10.3
11.2
17.9 30
14.5
20.8

17. Upper Legform Impact Speed to Represent HTD
Minivan
Car velocity [km/h]
Bumper Deflection
Contact Force
Velocity Change
HTD
Equivalent speed of upper legform [km/h] 10
AF05
5.2
6.6
6.9 15
8.5
9.5
10.0 20
9.2
15.4
15.0 25
12.5
C6Y
20.2
18.9 30
15.1
22.2
23.0

18. Upper Legform Impact Speed to Represent HTD
SUV
Car velocity [km/h]
Bumper Deflection
Contact Force
Velocity Change
HTD
Equivalent speed of upper legform [km/h] 10
AF05
7.0
C6Y
6.1
8.2 15
10.7
10.2
AM50
12.6 20
13.6
16.7 25
17.8
18.9
AM95
22.5 30
20.5
20.4
28.3

19. Next Steps
Consider the reduction of mass of upper legform to adjust the difference of effective mass between HTD and upper legform (e.g. use of the 7.4kg upper legform impactor used in Euro NCAP)
Clarify range of lower threshold of DPPS
Clarify impact speed capability for upper legform impactor in test labs