Abstract: This paper studies the longitudinal dynamic impact characteristics and the load transfer law of the typical aircraft seat/occupant system. With a comprehensive consideration of the pulse waveform, dummy response and seat response, the longitudinal dynamic impact process of the seat/occupant system is simulated based on the structure longitudinal dynamic crash test sled system to test and analyze the motion process and the trajectory of the dummy, the response of the internal acceleration and load of the dummy, and the acceleration and the strain of the typical part on the seat structure. The changing law of dynamic impact response of seat/occupant system is researched based on the experimental results. The results show that the dummy has significant head movement, the change trend of the dummy internal response is similar to the acceleration pulse waveform, and the pelvic acceleration and the lumbar spine load of the dummy are the largest, and the probability of the damage is the largest. Both the seat and the dummy have two load transfer paths, and the load mainly passes through the seat back leg and the dummy lumbar spine. The whole seat structure is in the elastic deformation stage, with the change trend of the typical acceleration being similar to the acceleration pulse waveform, and the seat back leg and the joint between the seat back tube and the armrest frame being subject to the greatest load and the maximum strain. The acceleration and the strain inside the seat are closely related to the Z-direction distance of the corresponding marking point.

Key words: longitudinal dynamic impact, aircraft seat, dummy, load transfer path, dynamic impact response