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针对典型的吸气式乘波体构型高超声速飞行器,研究了结构弹性对纵向静态特性和飞行动力学特性的影响.使用当地流活塞理论给出了高超声速非定常气动力模型,并结合简化的超燃冲压发动机模型及弹性机体结构模型,建立了考虑气动/结构/推进耦合的飞行器非线性纵向动力学模型.基于该模型分析了机体弯曲刚度变化对飞行器定常平飞配平参数、飞行包线以及动力学系统开环零极点的影响.结果表明:机体结构刚度降低将使配平升阻比减小,动稳定性变差,并且当其低于某一临界值时,升降舵配平特性将由正操纵变为反操纵.
The effect of structural elasticity on longitudinal static characteristics and aerodynamic characteristics is investigated for a typical aspirated booster hypersonic vehicle.The hypersonic unsteady aerodynamic model is given using the local flow piston theory and combined with simplified The model of the scramjet and the structure model of the elastic body are established and the nonlinear longitudinal dynamics model of the aircraft considering the aerodynamic / structural / propulsive coupling is established. Based on the model, And the effect of the open-loop zero-pole of the dynamical system.The results show that the decrease of the stiffness of the body structure will reduce the drag-and-drag ratio and the dynamic stability will be worse, and when it falls below a certain critical value, Become anti-manipulation.