关键词: 抗坠毁, 理论模型, 直升机

Abstract: Based on the study of the mechanical behavior of helicopter structures, including both experiment and FEM analysis, a simplified mechanical model for helicopter crashworthiness design, which can be used to predict the maximum impact force in the crash procedure and design some energy-absorption components, is proposed. The dynamic response of a helicopter with initial speed 10.2 m/s vertically impinged at the ground is calculated. The ratio of the dissipated energy absorbed by the landing gear to the total input energy and the kinetic energy decreasing curve of the fuselage during impact process are obtained. The comparison between the theoretical results and FEM results is reasonable agreement.

Key words: Crashworthiness, Helicopter, Theoretical model