【摘要】：隨著國家交通事業(yè)的發(fā)展，斜拉橋在大跨度橋梁中得到了越來越多的應用。但在工程實際運用中，拉索振動問題是大跨度斜拉橋在工程中不可避免也亟待解決的問題。 工程中，通過改變斜拉索的表面形狀或者把單索相互連接，組成具有較高頻率的索網(wǎng)，可以很好的抑制拉索的振動。但這兩種方法破壞了原斜拉橋拉索的立面美學效果，故在實際中應用較少。 在橋面和斜拉索之間設置機械阻尼器的方法已經(jīng)被廣泛應用于抑制拉索的振動。但是，由于受阻尼器安裝位置的影響，機械阻尼器的減振效率遠難達到理論值；拉索發(fā)生振動時一般是多模態(tài)的振動，機械阻尼器只能抑制某一階模態(tài)的振動。使用磁流變液阻尼器對拉索進行半主動控制，為此種問題提供了一種新的解決途徑。 本文對斜拉橋拉索的渦激振動及控制進行了研究，，主要內(nèi)容有： （1）通過對渦激振動的模型進行分析，選取適宜渦激模型運用于本文拉索渦激振動控制的研究。對所選模型進行無控條件下拉索渦激振動的模擬分析。通過分析，選取合適的工況條件，進行拉索的渦激振動控制的模擬和分析。 （2）通過拉索渦激振動的運動方程和狀態(tài)方程，對拉索渦激振動進行了被動控制的仿真。在被動控制中，分析了線性粘滯阻尼器安裝位置處的拉索的鎖緊現(xiàn)象和不同粘滯系數(shù)對斜拉橋拉索渦激振動控制效果的影響。 （3）對拉索渦激振動進行主動控制的模擬。通過分析不同參數(shù)，得到拉索渦激振動主動控制的控制效果。 （4）以斜拉索渦激振動中的主動控制的效果為目標，按照主動變阻尼算法簡單Bang-Bang控制算法對拉索進行渦激振動的半主動控制模擬分析。
[Abstract]:With the development of national transportation, cable-stayed bridges have been applied more and more in long span bridges. However, in engineering practice, cable vibration is an inevitable and urgent problem for long span cable-stayed bridges. In engineering, by changing the surface shape of the stay cable or connecting the single cable to each other to form a cable network with higher frequency, the vibration of the cable can be suppressed very well. However, these two methods destroy the facade aesthetic effect of the original cable-stayed bridge cable, so they are seldom used in practice. The method of installing mechanical dampers between the bridge deck and the cable has been widely used to suppress the vibration of the cables. However, due to the influence of the damper installation position, the damping efficiency of mechanical damper is far from the theoretical value. When cable vibration occurs, it is usually multi-modal vibration, and mechanical damper can only suppress the vibration of a certain mode. The magneto-rheological fluid damper is used to control the cable semi-actively, which provides a new way to solve the problem. In this paper, the vortex-induced vibration and control of cable-stayed bridge cables are studied. The main contents are as follows: (1) through the analysis of the model of vortex-induced vibration, the suitable vortex-induced model is selected to be applied to the control of the vortex-induced vibration of cable in this paper. The model is simulated and analyzed under uncontrolled conditions. Through the analysis, the suitable working conditions are selected to simulate and analyze the vortex-induced vibration control of the cables. (2) through the equations of motion and state of the vortex-induced vibration of the cables, the passive control simulation of the vortex-induced vibration of the cables is carried out. In the passive control, the locking phenomenon of the cable at the installation position of the linear viscous damper and the influence of different viscosity coefficients on the control effect of the vortex-induced vibration of the stayed cable of the cable-stayed bridge are analyzed. (3) the active control of the vortex-induced vibration of the cable is simulated. By analyzing different parameters, the active control effect of vortex-induced vibration of cable is obtained. (4) the effect of active control in vortex-induced vibration of stay cable is taken as the target. According to the simple Bang-Bang control algorithm of the active variable damping algorithm, the semi-active control simulation of the vortex-induced vibration of the cable is carried out.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.3;U448.27

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本文編號：2247947