Abstract:

An optimization strategy was proposed based on the airbag parameters optimization for outof-
position (OOP) children. According to SAEJ1980-2008 regulation by Society of Automotive Engineers,
MADYMO (mathematical dynamic Model) was used to establish a Multi-body and Finite Element (FE) model for
two OOP children aged 3 and 6 years old. The combined injury probability (Pcomb) of occupants was considered
as object function in reference to the US-NCAP regulation, and variables were optimized by LS-OPT (Least
Squares + Design Optimization and Probabilistic Analysis) software. The optimization was performed using
hybrid simulated annealing algorithm to minimize the value of Pcomb, with space-filling sampling method. The
results show that the optimal object value meet the regulation requirement basically; protection effect of dualstage
inflator is better than single-stage inflator significantly in 54 km/h frontal test.

Key words: vehicle passive safety, children occupants, out-of-position (OOP), airbag, combined injury
probability, LS-OPT optimization