基于磁致伸縮作動器的拉索振動控制理論與實驗研究
[Abstract]:The cable of cable-stayed bridge has the characteristics of light weight, large flexibility, low natural frequency and low damping. Under the action of external load, cable can easily produce many kinds of harmful vibration and stability to the cable-stayed bridge. The comfortableness and safety are very unfavorable. It is a feasible method to use magnetostrictive actuator to control the cable vibration by applying axial control force to the cable. This paper comes from the project of National Natural Science Foundation of China, "Theory and Experimental study of active Control of stay cables based on Magnetostrictive Actuator (51078142)", aiming at the mechanical model of Magnetostrictive Actuator. The vibration control theory and experiment of cable magnetostrictive actuator are studied. The main research work includes: (1) the development of cable-stayed bridge and four common vibration forms of cable are introduced, and the vibration control method of cable is expounded. The research and application of magnetostrictive actuator are introduced. (2) the physical characteristics and mechanical properties of the giant magnetostrictive actuator are introduced. In this paper, the experiment of magnetostrictive actuator under the cable model is designed, and the magnetostrictive actuator's magnetostrictive actuator coupling relationship model under the cable model is obtained. (3) the cable vibration control theory is introduced. The control state equation of cable is established, and the solution strategy of bilinear control state equation of cable is put forward. (4) the model of cable control experiment is established by using matlab software. The method of active LQR control and semi-active Bang-Bang control is used to simulate and analyze the experiment, and good damping effect is obtained. (5) the experimental model and real-time control system of cable are established, and the experimental scheme of cable vibration control is designed. The control experiments of cable under free vibration, simple harmonic vibration and random vibration are completed, and good damping effect is obtained.
【學位授予單位】:湖南科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U448.27
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