【作者】 付青涛；

【导师】 宋彦国；

【作者基本信息】 南京航空航天大学 ， 飞行器设计， 2011， 硕士

【摘要】 倾转旋翼飞行器是一种新型飞行器,其具有直升机和固定翼飞机的共同特点,既能像直升机一样垂直起降,又能实现飞机模式的高速前飞,正因为其优良的特性,导致其本身结构复杂,技术难点多等特点。建立倾转旋翼飞行器的飞行动力学模型是对倾转旋翼飞行器进行研究的重要内容,是实现直升机模式与飞机模式互相转换的基础,也是研究其控制系统的关键所在。本文针对某型无人倾转旋翼飞行器进行了机理建模以及系统辨识建模。首先采用机理方法,针对飞行器的高度非线性和复杂动力学特性建立了其机理模型,并将此模型进行了扩展,使之也可运用到直升机上;然后在所建立的非线性飞行动力学模型基础上,采用小扰动假设对模型在平衡点附近进行了线化,建立了倾转旋翼飞行器小扰动线化飞行动力学模型;而后建立了旋翼飞行器的通用仿真模型,并验证了模型的正确性;最后,以机理模型的小扰动线化模型作为待辨识模型集,进行系统辨识建模,采用了状态子空间方法获得初始模型,再采用预报误差法获得最优模型,通过仿真计算,成功地辨识得到了倾转旋翼飞行器的飞行动力学模型。更多还原

【Abstract】 The tilt-rotor aircraft is a new type of aircraft and shares the common features of helicopter and fixed wing aircraft. It can take off and land vertically like a helicopter,and can fly forward at high speed like the aircraft. Because of the excellent features, it has complex structure and lots of technical difficulties. Establishing the model of flight dynamics is an important part of the research on the tilt-rotor aircraft control system.Two methods—mechanism modeling and system identification modeling—are used to establish unmanned tilt-rotor aircraft model. Firstly, we develop a complex and nonlinear dynamic tilt-rotor aircraft model by using the mechanism modeling, and extend the model so that it can also be applied to the helicopter. Secondly, we linearize the dynamics model near the equilibrium point based on a small disturbance hypothesis. Thirdly, we verify the correctness of the modeling method by trimming the helicopter. At last, system identification was conducted the initial model is developed by using subspace identification method, and the final optimized model is constructed by prediction error method. The flight mechanics mode of the tilt-rotor aircraft is successfully identified through simulation.更多还原