节点文献
碟形环翼飞行器飞行力学特性分析
Flight Mechanics Analysis of A Type Dish-shaped Rotor Aircraft
【作者】 陈帅；
【导师】 宋彦国；
【作者基本信息】 南京航空航天大学 ， 工程硕士（专业学位）， 2017， 硕士
【摘要】 碟形环翼飞行器是一种结合了垂直起降和高速前飞能力的新构型旋翼飞行器,由共轴双旋翼、环翼、涵道推力风扇、起落架和控制系统组成。本论文对该碟形环翼飞行器的飞行力学特性进行了分析。首先,建立该飞行器的飞行动力学模型。基于叶素理论建立了旋翼的非线性气动力数学模型;结合前期研究成果,利用CFD计算和风洞试验得到的数据建立碟形环翼的气动力模型;利用经验公式建立涵道推力风扇、起落架和控制系统等的气动力模型。最后将各个部件的气动模型进行综合,建立起全机的飞行动力学模型。其次,对该飞行器的特殊飞行模式进行分析。该飞行器的飞行状态分为直升机模式、过渡飞行模式和稳定自转飞行模式。分析旋翼稳定自转的影响因素和气动优势,并将旋翼稳定自转状态引入飞行过程,得出飞行器在不同飞行模式下的操纵策略。之后,计算飞行器在不同飞行模式下的飞行性能。最后根据理论模型编写计算各个气动部件力和力矩的模块程序,并在MATLAB/simulink环境下搭建仿真模型。对该飞行器进行配平计算,并分析该飞行器的操稳特性。
【Abstract】 The dish-shaped rotor aircraft is a new type of configuration rotor aircraft which combines the advantages of vertical take off and landing capabilities with the high forward speed.It consists of a coaxial rotor,ring wing,thrust ducted fan,landing gear and a control system.In this paper,flight mechanics characteristics of a type of dish-shaped rotor aircraft were analyzed.Firstly,the flight dynamics model of the aircraft was established.This dissertation built the main rotor nonlinear aerodynamic mathematical model based on the Blade-Element theory.The aerodynamic model of dish-shaped wing was obtained by CFD calculation and test data,combined with the previous research results.The aerodynamic model of ducted fan thrust,landing gear and control system were built using empirical formula.Finally,the aerodynamic model of each component was integrated to establish the flight dynamics model of the aircraft.Secondly,the special flight mode of the aircraft was analyzed.The flight state of the aircraft was divided into helicopter mode,transitional flight mode and stable rotation flight mode.In this paper,the influence factors and aerodynamic advantages of the rotor stable rotation were analyzed.The steady state of the rotor to the flight process was introduced.The maneuvering strategy of the aircraft in different flight modes was obtained.Thirdly,the flight performance of the aircraft in different flight modes was calculated.Finally,according to the theoretical model,the program for calculating the force and moment of each pneumatic component was established,and the simulation model was built in MATLAB/simulink environment.The trim of the aircraft was calculated.The handling and stability characteristics were analyzed.