大柔性飞机着陆撞击多质量块等效模型

 考虑飞机结构振动刚性模态和前n阶弹性模态,将飞机机体等效地转化为多质量块等效模型,给出了等效系统力学参量的计算方法,为计及机体振动影响的起落架落震试验设计,通过试验检验或确定起落架着陆载荷、功量等提供模型依据,同时也为起落架设计分析、设计计算提供了简明的等效系统。还给出了大柔性飞机着陆功量、机翼位移、剪力、弯矩计算公式。算例结果表明大柔性飞机的起落架设计有必要考虑机体结构弹性,并从全局出发,采用特殊的构造措施和优化设计技术。

An Equivalent Multi-mass System of a Flexible Airplane

For the case in which the rigid mode and the first n modes of a flexible airplane are considered,the body of the airplane is defined as a multi-mass equivalent system and the calculation formulas of the parameters of the system are derived,which presents a model for testing/verifying landing impact load,landing work etc.under the influence of fuselage vibrations and also presents a simple and clear equivalent system for landing gear design analysis.The formula for calculating the landing work,displacement at the wing tip,the shears and bending moments of the wing of a flexible airplane are also given.From an overall point of view,structure deformation of airplane must be considered and optimization design must be used in landing gear design of a flexible airplane.