D. Ma et Hm. Lankarani, A MULTIBODY FINITE ELEMENT ANALYSIS APPROACH FOR MODELING OF CRASH DYNAMIC-RESPONSES/, Journal of mechnical design, 119(3), 1997, pp. 382-387
Computer models of the human body are robust tools for gaining insight
into the gross motion of ground vehicle or aircraft occupants and eva
luating the loads and deformations of their critical parts. The knowle
dge of occupant responses will help in the determination of the type a
nd probable causes of injuries that may be sustained during a crash. A
n important aspect in crash analysis is how the large motion of the re
latively rigid segments of an occupant, such as the limbs, and the sma
ll deformations of flexible segments, such as the spine column, are in
terrelated. To this end a general methodology for kineto-static analys
is of multibody systems with flexible structures undergoing large moti
on and structural deformations is developed Rigid multibody dynamics i
s used to predict the gross motions and displacements at the boundarie
s between the relatively bulky (rigid) bodies and relatively flexible
ones. A mired boundary-condition finite-element analysis is formulated
and solved at every numerical integration rime to determine the corre
sponding reaction forces and moments at the boundaries and also the st
ructural deformations. Based on this methodology, a multibody model of
the occupant with a nonlinear finite element model of the lumbar spin
e is developed for a Hybrid Il anthropomorphic crash test dummy. The a
nalytical results obtained are compared with the experimental results
from the impact sled tests. Comparison of the results has shown better
correlation between the analyses and the experiments compared with ea
rlier studies.