【作者】 王伟；

【导师】 王传礼；

【作者基本信息】 安徽理工大学 ， 机械电子工程， 2012， 硕士

【摘要】 超磁致伸缩材料(Giant Magnetostrictive Material,简称GMM)是一种新型的功能材料,在室温下的形变量和输出力大,并且对信号输入能快速响应,现已成为物理学、材料科学、电磁学、控制工程和机械工程等诸多领域的研究热点,其应用价值已逐步显现。本文基于GMM的众多优点,设计了一种伺服阀用转换器(Giant Magnetostrictive Actuator,简称GMA),并对其进行了静动态理论分析,建立数学模型进行动态仿真分析,仿真结果显示GMA阶跃上升时间Tr为0.8ms,稳态输出力F可达1832N,表明GMA具有响应速度快、输出力大等显著特点。同时基于该GMA转换器,设计了一种新型结构的直动式高频电液伺服阀,并通过理论分析和计算、数学建模和动态仿真分析、电磁场有限元分析等,对其关键技术进行了系统的研究,得出如下结论：对GMM直动式高频伺服阀而言,其相位裕度可达γ=84°,幅值裕量Kg＝17dB,幅频宽ε=499Hz,幅值穿越频率ωgc=403Hz,相位穿越频率ωpc=5780Hz,可见基于GMM的直动式高频伺服阀的响应速度快、精度高、稳定性好；转换器GMA的阻尼系数、线圈匝数、阀体结构等对伺服阀动态特性的影响较大,增大GMA的阻尼系数可以提高伺服阀的高频特性,增加线圈匝数可以增大伺服阀的流量,减少伺服阀的构件数量可以提高伺服阀的响应速度。本文的研究可为基于GMM的直动式高频伺服阀的设计提供了理论基础,为直动式高频伺服阀的研究注入了新的活力,同时为进一步优化该伺服阀的结构提供了重要依据。更多还原

【Abstract】 Giant Magnetostrietive Material (GMM) is a new type of functional material. Its excellent performance as giant strain and large output force. It can respond quickly when the signal input. It has become a hot spot of research in the field of physics, materials science, electromagnetics, control engineering and mechanical engineering, the value of its application has been gradually revealed.In this paper, based on the merits of GMM, the structure of a new Giant Magnetostrictive Actuator(GMA), used in servo valve is designed, as well as its static and dynamic theory analysis worked. The mathmatical models are built for simulation analysis, the results of which show that the step rise timeTr and the steady state output force F of GMA are respectively0.8ms and1832N. This means GMA has notable features of high response and large output force. And based on the merits of GMA, a new structure of high-frequency direct-acting hydraulic servo valve is designed. Through theoretical analysis and computation, mathematical modeling and dynamic simulation analysis, electromagnetic finite element analysis, carried out a systematic study of its key technologies.Reached the following conclusions:For GMM direct-acting high-frequency servo valve, the phase margin γ=84°,gain margin Kg=17dB, amplitude wide ωb=499Hz, the amplitude across the frequency=403Hz, the phase crossover frequency=5780Hz. It is visible that GMM direct-acting high-freqency servo valve has features of fast response speed, high precision and better stability.The coil turns and damping of GMA convert and body structure of valve have a greater impact on the dynamic characteristics of the servo valve. Increasing the GMA damping can improve the high frequency characteristics of the servo valve. Increaseing the coil turns can increase the flow of the servo valve. Reducing the number of components of the servo valve can improve the response speed of the servo valve.This study Provides a theoretical basis for the design of direct-acting high-frequency servo valve based on GMM and injects new vitality to the studying of direct-acting high-frequency servo valve and provides an important basis for further optimization of the structure of the servo valve.更多还原