【摘要】 基于直升机结构件的力学性能研究,根据试验和有限元分析结果,提出了进行直升机抗坠毁设计的简化力学模型。模型主要用于在垂直坠毁过程中的最大冲撞力的预测和关键抗坠毁构件的能量吸收设计。利用此简化模型,对直升机10.2m/s速度垂直撞击地面这一工况进行了计算,得到了起落架吸收的能量(塑性功)占初始动能的百分比,等效机体的动能衰减曲线等重要结果,与有限元结果对比,吻合较好。更多还原

【Abstract】 Based on the study of the mechanical behavior of helicopter structures, including both experiment and FEM analysis, a simplified mechanical model for helicopter crash-worthiness 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.更多还原