多电飞机功率电传作动器研究

发布时间：2017-12-28 07:26

本文关键词：多电飞机功率电传作动器研究　出处：《南京航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：近年以来,在飞机设计领域,多电飞机(More Electric Aircraft,MEA)的研究受到了世界各国科研人员越来越多的重视。功率电传作动技术(Power by Wire,PBW)作为MEA的核心技术,成为现今飞机传动领域的研究热点。电静液作动器(Electro-Hydrostatic Actuator,EHA)是PWB的重要实现形式,本文对其工作原理和控制方法进行了研究并且分别建立EHA的线性化模型和非线性模型。本文首先建立了EHA的线性化数学模型。EHA的线性化数学模型包含了电机模型,液压泵模型,液压缸模型和负载模型。在推导出了EHA系统的传递函数的基础上,利用MATLAB/Simulink进行了模型设计和仿真实验,控制方案采用了经典PID控制。无刷直流电机(Brushless DC Motor,BLDCM)在EHA系统实现了电能到机械能的转换,也是EHA的动力输入来源。本文对无刷直流电机进行了精细建模,设计了电流滞环和转速闭环控制的双闭环调速方案。为了避免数学模型不能涵盖模型的液压元件的部分非线性因素的影响,使用MATLAB/Simulink液压工具箱与机械工具箱等进行物理建模和仿真实验。考虑到EHA工作时系统的非线性摩擦力的影响,建立了EHA的非线性模型,并且根据计算机控制的需要,对模型进行了离散化处理。然后,将连续系统中的滑模变结构控制(Sliding Mode Control,SMC)理论应用到离散型系统中,设计了滑模面和控制器,进行了仿真实验。通过与传统的线性模型的仿真结果进行了对比,表明了滑模变结构控制方法更适合于EHA系统的控制。通过对EHA的结构和工作原理研究,本文建立了EHA的多种状态下的数学模型,实现了滑模变结构控制方法在EHA控制领域的应用。解决了EHA系统响应时间过长,工作频宽较窄的问题。
[Abstract]:In recent years, in the field of aircraft design, the research of More Electric Aircraft (MEA) has been paid more and more attention by researchers all over the world. Power by Wire (PBW), as the core technology of MEA, has become a hot research topic in the field of aircraft transmission. Electro-Hydrostatic Actuator (EHA) is an important realization form of PWB. In this paper, its working principle and control method are studied, and EHA's linearization model and nonlinear model are established respectively. In this paper, the linearized mathematical model of EHA is first set up. The linear mathematical model of EHA includes the motor model, the hydraulic pump model, the hydraulic cylinder model and the load model. On the basis of the derivation of the transfer function of the EHA system, the model design and simulation experiment are carried out with MATLAB/Simulink, and the control scheme adopts the classical PID control. Brushless DC Motor (BLDCM) realizes the conversion of electrical energy to mechanical energy in EHA system, and is also the source of dynamic input of EHA. This paper makes a fine modeling of Brushless DC motor, and designs a double closed loop speed control scheme of current hysteresis loop and speed closed loop control. In order to avoid that mathematical models can not cover the influence of some nonlinear factors of the hydraulic components of the model, physical modeling and simulation experiments are carried out by using MATLAB/Simulink hydraulic toolbox and mechanical toolbox. Considering the influence of nonlinear friction of EHA system, a nonlinear model of EHA is established, and the model is discretized according to the need of computer control. Then, the Sliding Mode Control (SMC) theory is applied to the discrete system, and the sliding surface and controller are designed, and the simulation experiments are carried out. The comparison of the simulation results with the traditional linear model shows that the sliding mode variable structure control method is more suitable for the control of the EHA system. By studying the structure and working principle of EHA, a mathematical model of EHA under various conditions is established, and the application of sliding mode variable structure control in the field of EHA control is realized. It solves the problem that the response time of EHA system is too long and the working frequency is narrow.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V242

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