1. IWG-DPPS Investigation of Test Condition in Overshoot Duration

2. Schematic of Bonnet Activation
Overshoot Duration
Need to be considered
Steady (convergence) State
Static Test
Actuator Activating state
Dynamic Test
Bonnnet Lift
Intended Height
Lift of actuator
Lift of Bonnet
*It is assumed that lift of bonnet is greater than that of actuator since actuator has lock system
TRT
Time
HIT
HIT
HIT
Items to be considered:
Difference of HIC value between dynamic and static test condition at the start timing of overshoot (worst case)

3. HIC Difference between Dynamic and Static Condition
Car model and simulation conditions
Schematic of this investigation
Car model and detailed simulation condition
Car model: with active bonnet (static test is available in all of headform test area)
Actuator location: Below the bonnet hinge (only lifted in rear of the bonnet)
Actuator lift speed: maximum considering production variation
Impact Point: On center line, at the point where HIT is approximately 35ms larger than TRT (enough for static test)
Impactor: Child 50 degree
Bonnet Lift speed: 2.1m/s
Time
Bonnnet Lift
Intended Height
TRT
Lift of actuator
Lift of Bonnet
Actual HIT for this condition
Virtually confirmed timing
Image of Impact Location
HIC difference between dynamic and static condition at the start timing of overshoot was virtually confirmed

4. HIC Difference between Dynamic and Static Condition
Results
Comparison bet. Dynamic and static condition at 35km/h
Dynamic
Static
Condition
HIC
Dynamic
661.4
Static
639.4
In current virtual condition, HIC difference between dynamic and static condition is approximately 3%