Dynamic response analysis of the THOR-LX dummy lower extremity 2001-06-0072
Regarding THOR-50AM dummy lower extremities (hereafter referred
to as ""THOR''and ""THOR-LX'')
developed as an assembly of lower extremities for next-generation
dummies in frontal impact test, we have conducted a series of tests
as follows. HYGE sled tests with a toe-board simulating the impact
upon intrusion into the vehicle compartment around the occupant
feet, dummy dropping tests with two different postures; one is the
upright posture with the knees set straight and another is the
posture with the knees bent, in order to apply impact loads and to
measure/evaluate the impact response characteristics. The main
findings obtained through the above are as follows.
1.HYGE Sled Tests
(1)In the same impact conditions, some differences are seen by
the polarity and values of tibia moment between THOR-LX and Hybrid
III-50 AM dummy lower extremities (hereafter referred to as
""HyIII'' and "'HyIII-
(2)When the floor displacement rate and/or toe-board rotation
angle are increased, the ankles of HyIII-LX are locked up by
dorsiflexion which affects the values measured with the tibia load
gauges, whereas such an effect is absent with THOR-LX.
(3)The values measured with the tibia load gauges roughly
correspond with the floor/toe-board motion for THOR- LX,but the
values of HyIII-LX sometimes do not correspond with the toe-board
2.Dummy Dropping Tests
(1)Values of tibia axial force of THOR-LX are closer to those
obtained with the volunteers (University of Heidelberg data),while
those of HyIII-LX are greater.
(2)Due to differences in tibia-knee and tibia-ankle fitting
locations, the values of tibia moment of HyIII-LX with inclined
tibia axis become greater than those of THOR- LX with practically
vertical tibia axis.
(3)Due to differences in structures of legs, ankles and feet,
the pelvis acceleration peak timing with HyIII-LX is earlier than
that of THOR-LX in each one of the dummy postures, and the interval
from the pelvis acceleration peak timing to the tibia load peak
timing is shorter with HyIII- LX.