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The Structures and Materials Research Center of the National Aerospace Laboratory of Japan (NAL) conducted a vertical drop test of a fuselage section from a NAMC YS-11 transport airplane in December2001. This test program is a part of research activities in NAL on the structural crashworthiness of transport aircraft. In addition a cooperative research related to this test program was carried out between NAL and Kawasaki Heavy Industries, Ltd.(KHI). The main objective of this program is to develop optimal numerical models for crash simulation of aircraft fuselage and to obtain background data by drop tests of small-scale structural models and a full-scale fuselage section. Prior to the drop test of a full-scale fuselage structure, a trial numerical simulation on the crash behavior of a small-scale sub-floor structure was conducted by NAL using the explicit, nonlinear dynamic analysis code, LS-DYNA3D.

For ensuring occupant's survivability in case of aircraft crash accident, it is necessary to alleviate the impact load to an allowable level of the human body. This research aims to develop the analytical models for simulation of impact characteristics of aircraft fuselage structure. The numerical analysis on the sub-floor structures was executed by using nonlinear dynamic analysis code LS-DYNA3D, and the results of analytical models are evaluated using the results of crash tests of structural models.