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  本文關(guān)鍵詞： 斜拉索 拉索振動控制 超磁致伸縮作動器 LQR控制 Clipped-LQR控制 Bang-Bang控制　出處：《湖南科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：斜拉橋拉索具有質(zhì)量輕、柔度大、阻尼小、固有頻率低等特點，在外部荷載作用下，拉索很容易產(chǎn)生多種形式的有害振動。本文采用磁致伸縮作動器對拉索振動開展主動、半主動控制研究。超磁致伸縮作動器是以超磁致伸縮材料為驅(qū)動元件的作動器，具有結(jié)構(gòu)緊湊、出力大、輸出功率大、反應(yīng)迅速等特點。本文課題來源于國家自然科學基金項目--“基于磁致伸縮作動器的斜拉索主動控制理論與試驗研究（51078142）”，針對磁致伸縮作動器力-磁模型、拉索磁致伸縮作動器主動、半主動控制實驗開展研究，主要的研究工作包括： （1）介紹了拉索主動、半主動控制理論，論述了結(jié)構(gòu)振動控制理論，建立了拉索的主動控制運動方程，并用經(jīng)典線性最優(yōu)控制算法求解；分析了LQR控制、Clipped-LQR控制和Bang-Bang控制的原理，并根據(jù)不同的控制算法進行了拉索控制方程的求解，為振動實驗提供了理論依據(jù)。 （2）介紹了超磁致伸縮作動器的主要性能研究，分析了自制的作動器的構(gòu)造與預壓力偏置磁場的設(shè)計；對超磁化改善后超磁致伸縮作動器分別進行了有無偏置磁場條件下的力學性能測試，得出磁致伸縮作動器的力-磁耦合關(guān)系函數(shù)。 （3）采用Matlab軟件對實驗模型拉索進行數(shù)值仿真分析。應(yīng)用三種不同控制策略（LQR控制、Clipped-LQR控制和Bang-Bang控制），在三種不同的荷載工況（自由振動，，簡諧激勵，隨機激勵）下，對實驗拉索進行了振動控制仿真分析，證實了其可行性。 （4）設(shè)計了拉索振動控制實驗模型系統(tǒng)，介紹了實驗所需的主要實驗儀器，介紹了實驗的原理與控制程序，對不同荷載條件下的拉索進行主動、半主動控制，評估對應(yīng)控制算法下的拉索控制系統(tǒng)的減振效果。
[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.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.27

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