Abstract:

Structure improvement was made for a rear-facing child seat. Models of frontal impact sled test for
the original and the improved child seats were built and then simulated using Lsdyna-Madymo coupling method
referring to the Regulation No. 44 by the Economic Commission for Europe. A front impact sled test was made
with a sample of the improved child seat. The results show that the peak of the resultant head acceleration
reduces 15 g, the time in which the resultant chest acceleration exceeds 55 g is cut in 2ms, and the time in
which the chest acceleration vertical component exceeds 30 g is 2.4ms when using the improved child seat.
The test results are in accordance with the simulation results. The time in which the resultant chest acceleration
exceeds 55 g is cut in 1.7ms, and the time in which the vertical component of the chest acceleration exceeds 30 g
is 2.85ms, without obvious structure damage during the sled test.

Key words: motor vehicle, passive safety, child seat, structure improvement, Lsdyna-Madymo coupling method