论文部分内容阅读
飞行器的稳定性分析与建立的动力学分析模型密切相关。传统的稳定性分析方法是基于小扰动假设建立线性化模型,当飞行状态中非线性特征明显时,其结果误差会带来多大的影响是人们关心的问题。通过建立飞行动力学非线性模型和气动力非线性模型,采用时间推进方法对两类非线性问题进行了比较系统的研究。数值计算结果表明,飞行动力学非线性模型与线性模型相比,周期增大、幅值减小、衰减率增大;而非线性气动力模型对周期几乎没有影响,但对幅值有一定的影响。
The stability analysis of the aircraft is closely related to the established dynamic analysis model. The traditional method of stability analysis is based on the hypothesis of small perturbation to establish a linearized model. When the nonlinear characteristics of the flight state are obvious, how much the result error will bring is a concern. Through the establishment of flight dynamics nonlinear model and aerodynamic force nonlinear model, two kinds of nonlinear problems are systematically studied by time-propulsion method. The numerical results show that, compared with the linear model, the nonlinear dynamics model increases the period, decreases the amplitude and increases the decay rate. However, the nonlinear aerodynamic model has almost no effect on the period, but has a certain effect on the amplitude influences.