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在当代飞机设计及背景预研项目中,飞机纵向模态特性分析是必不可少的一个环节,模态特性也是影响飞机飞行操纵品质和飞行安全的因素之一,为了全面熟悉纵向周期模态特性,需要建立合理的纵向小扰动简化运动方程及相关动力学模型。给出了简化处理的线化小扰动方程,然后基于某运输机模型的气动数据以及飞行包线内的巡航状态,结合简化模型,在频域内对纵向周期模态特性进行了仿真分析。结果表明:简化模型可以准确地反映运输类飞机的纵向周期模态特性。同时,考虑了飞机发动机、操纵等结构系统对其模态特性的影响,因而提出了一些运输机设计和控制方法,为其它飞机型号设计提供工程理论指导。
In the contemporary aircraft design and background pre-research project, the analysis of aircraft longitudinal modal characteristics is an indispensable part. Modal characteristics are also one of the factors that affect the flight control quality and flight safety. In order to fully understand the longitudinal periodic modal characteristics , We need to establish a reasonable longitudinal perturbation to simplify the equations of motion and related dynamics model. Based on the aerodynamic data of a transport aircraft model and the cruise status in the flight envelope, a simplified model is presented to simulate the longitudinal periodic modal characteristics in the frequency domain. The results show that the simplified model can accurately reflect the longitudinal periodic modal characteristics of transport aircraft. At the same time, considering the influence of structural system such as aircraft engine and steering on its modal characteristics, some transport aircraft design and control methods are proposed to provide engineering theoretical guidance for other aircraft model design.