Shock absorber using inward-folding composite tube and its application to a crew seat: numerical simulation

Machine-building Engineering and Machine Science

Machine science, drive systems and machinery


Na L. .1, Zhefeng Y. .2*, Yi F. 2**

1. Shanghai Aircraft Design and Research Institute Commercial Aircraft Corporation of China, Shanghai, China, 201210
2. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, China, 200240



This paper presents an innovative energy absorber consisting of an inward folding of composite tube, which is cut axially and turned into the inner of the itself. There is no excess of composite fragments after the composites destruction, and the debris will fill in the inner part of tube to increase the energy absorption. The impact energy is absorbed mainly by the fibers fractures, as well as delamination and friction between composite tube and the cylinder wall of the cap. Impact tests were performed to study the energy absorption performance. To study the shock absorber effect on the shock-resistance of the helicopter crew seat, a four-degree-of-freedom nonlinear biodynamic model corresponding to 50th-percentile male occupant was developed. The simulation results revealed a good shock-absorber shock-resistance performance.


Shock Absorber, Inward-folding, Composite, Helicopter seat, Biodynamic model


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