Evaluation the performance of a typical seat belt restraint system for carrier-based aircraft during arrested landing process

摘要

In order to evaluate the differences in the restraint performance of seat belts on different percentiles dummies and compare the effects of the safe belts locking parameter on the performance of the restraint, a dynamic model of dummy-belt-seat system is established. With the acceleration curve at seat base during typical arrested landing reported in the literature as the input, numerical simulation was conducted to test the validity of the model. The head displacement, the angle between trunk and seat-back of dummies and head displacement differences under different locking parameters during arrested landing are obtained. The results show that the head displacement of 50 percentile Hybrid O dummy is the smallest, about 0.25m(forward) and 0.15m(vertical), the angle between trunk and seat-back is about 20°. And the head displacement when belt locked reduces with the locking time shorten, about 66% for 5 percentile dummy and 23% for 95 percentile dummy when the locking time change from 0.5 to 0.2s. However, for 95 percentile dummy, the head displacement after the locking device releasing when 0.2s is bigger than when 0.35s. As for the injury, dummy has a relative worse situation when the locking time is 0.35s than other conditions. The paper reaches the conclusion that this model has the best restraint performance on medium-sized body, and shorten the locking time can improve the restraint performance to a certain extent for sure but for large-sized body, the restraint performance is not good if the locking time is too short. There is a balance point to ensure the best effect combining the displacement before and after the belt releasing. As for injury, due to the small acceleration in this process, the risk of injury is relatively small and the influence of locking parameter is also small.