基于磁致伸缩作动器的拉索主动、半主动控制仿真与实验研究

发布时间：2018-02-07 17:09

本文关键词： 斜拉索拉索振动控制超磁致伸缩作动器 LQR控制 Clipped-LQR控制 Bang-Bang控制　出处：《湖南科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：斜拉桥拉索具有质量轻、柔度大、阻尼小、固有频率低等特点，在外部荷载作用下，拉索很容易产生多种形式的有害振动。本文采用磁致伸缩作动器对拉索振动开展主动、半主动控制研究。超磁致伸缩作动器是以超磁致伸缩材料为驱动元件的作动器，具有结构紧凑、出力大、输出功率大、反应迅速等特点。本文课题来源于国家自然科学基金项目--“基于磁致伸缩作动器的斜拉索主动控制理论与试验研究（51078142）”，针对磁致伸缩作动器力-磁模型、拉索磁致伸缩作动器主动、半主动控制实验开展研究，主要的研究工作包括：（1）介绍了拉索主动、半主动控制理论，论述了结构振动控制理论，建立了拉索的主动控制运动方程，并用经典线性最优控制算法求解；分析了LQR控制、Clipped-LQR控制和Bang-Bang控制的原理，并根据不同的控制算法进行了拉索控制方程的求解，为振动实验提供了理论依据。（2）介绍了超磁致伸缩作动器的主要性能研究，分析了自制的作动器的构造与预压力偏置磁场的设计；对超磁化改善后超磁致伸缩作动器分别进行了有无偏置磁场条件下的力学性能测试，得出磁致伸缩作动器的力-磁耦合关系函数。（3）采用Matlab软件对实验模型拉索进行数值仿真分析。应用三种不同控制策略（LQR控制、Clipped-LQR控制和Bang-Bang控制），在三种不同的荷载工况（自由振动，，简谐激励，随机激励）下，对实验拉索进行了振动控制仿真分析，证实了其可行性。（4）设计了拉索振动控制实验模型系统，介绍了实验所需的主要实验仪器，介绍了实验的原理与控制程序，对不同荷载条件下的拉索进行主动、半主动控制，评估对应控制算法下的拉索控制系统的减振效果。
[Abstract]:The cable of cable-stayed bridge has the characteristics of light weight, large flexibility, low damping and low natural frequency. Under external load, the cable can easily produce many kinds of harmful vibration. In this paper, the magnetostrictive actuator is used to initiate the vibration of the cable. Research on semi-active control. Giant Magnetostrictive Actuator is an actuator with giant magnetostrictive material as its driving element. It has compact structure, large output force and large output power. This paper comes from the project of National Natural Science Foundation, "active Control of stay cables based on Magnetostrictive Actuator" (51078142), aiming at the magnetostrictive actuator force-magnetic model. The active and semi-active control experiments of cable magnetostrictive actuator are carried out. The main research work includes:. 1) the active and semi-active control theory of cable is introduced, the theory of structural vibration control is discussed, the motion equation of active control of cable is established and solved by classical linear optimal control algorithm, the principle of LQR control Clipped-LQR control and Bang-Bang control is analyzed. According to different control algorithms, the cable control equation is solved, which provides a theoretical basis for vibration experiment. The main properties of giant magnetostrictive actuator are introduced. The construction of self-made actuator and the design of prepressure bias magnetic field are analyzed. The mechanical properties of the giant magnetostrictive actuator with or without bias magnetic field were tested after the improvement of supermagnetization, and the force magnetic coupling function of the magnetostrictive actuator was obtained. Three different control strategies are used to control Clipped-LQR control and Bang-Bang control under three different load conditions (free vibration, simple harmonic excitation, random excitation). The vibration control simulation analysis of the experimental cable is carried out, and the feasibility is verified. 4) designed the cable vibration control experimental model system, introduced the main experimental instruments needed for the experiment, introduced the principle and control program of the experiment, carried on the active and semi-active control to the cable under different load conditions. The vibration reduction effect of cable control system based on corresponding control algorithm is evaluated.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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