Design of a new bidirectional attenuation seat for manned spacecraft.

The multi-direction impact loads imposed on the crewman maybe exceed the head-pelvis acceleration limit. According to the vertical attenuation seat, a new directional attenuation seat system is designed for absorbing the horizontal and vertical landing impact energy. A dynamic model of this buffer system is presented via the Lagrange equations. Numerical simulations of the analytic model are consistent with that of the Adams software. The effects of reducing impact loads between the vertical attenuation seat and the bidirectional one are compared. And the response characteristics of the head and the turn center are also presented. Numerical results show that the bidirectional attenuation seat reduces the head-pelvis acceleration markedly, and has little influence on vertical attenuation pole and chest-back acceleration. [ABSTRACT FROM AUTHOR]