本文選題：粘滯阻尼器 + FLUENT數(shù)值模擬　； 參考：《哈爾濱工業(yè)大學》2017年碩士論文

【摘要】：隨著經(jīng)濟的發(fā)展,各種超高層建筑物、跨海大橋大量涌現(xiàn),為了提高這些結構的抗震(振)性能,行業(yè)內對這些結構的隔震與耗能減振的要求越來越高。粘滯阻尼器作為一種減震(振)裝置,早在20世紀70年代便已經(jīng)出現(xiàn)。隨著近幾十年的發(fā)展,粘滯阻尼器產(chǎn)品的力學性能日趨完善,也被越來越多的結構所應用。粘滯阻尼器是一種速度相關型阻尼器,通過外部結構的振動帶動活塞桿的運動,使內部粘滯流體流動,通過粘滯流體與阻尼孔的摩擦達到耗能減震的目的。它對結構振動的控制屬于被動控制,即不需要額外的能量驅動。論文采用有限元軟件FLUENT,對不同活塞孔結構形式、不同動力粘度的粘滯流體阻尼器出力進行數(shù)值模擬,研究它們的力學性能及其參數(shù)影響規(guī)律。開展的工作及取得的成果如下所示:(1)對已進行力學性能試驗的原型粘滯阻尼器進行數(shù)值模擬,并與試驗結果進行對比分析,驗證了采用FLUENT軟件數(shù)值分析粘滯阻尼器的可行性和模型的正確性。同時通過流場圖獲得了其內部流場特征。(2)基于所建立的阻尼器有限元模型,數(shù)值模擬研究了直孔型孔隙式粘滯阻尼器各結構參數(shù)及粘滯流體動力粘度系數(shù)對粘滯阻尼器力學性能的影響規(guī)律。通過對各種曲線孔、孔隙—間隙混合型活塞孔及薄壁小孔結構形式的粘滯阻尼器的數(shù)值模擬,研究了開孔形式對阻尼器力學性能的影響特點。硅油運動粘度是粘滯阻尼器速度指數(shù)的主要影響因素,增大活塞過流斷面面積能有效地降低速度指數(shù)。(3)對射流孔阻尼器進行了數(shù)值模擬,研究了射流孔各結構參數(shù)及粘滯流體動力粘度系數(shù)對其力學性能的影響。增大能量交換室尺寸能夠有效地降低射流孔粘滯阻尼器的速度指數(shù)。
[Abstract]:With the development of the economy, a variety of super high-rise buildings and sea crossing bridges have springing up. In order to improve the seismic performance of these structures, the requirements for the isolation and energy dissipation of these structures are becoming higher and higher in the industry. As a kind of shock absorber (vibration) device, viscous dampers have appeared in 1970s. The mechanical properties of the viscous dampers are becoming more and more perfect and are also used by more and more structures. Viscous dampers are speed related dampers, which drive the movement of the piston rod through the vibration of the external structure, and make the viscous fluid flow and dissipate energy through the friction between the viscous fluid and the damped hole. The dynamic control is passive control, that is, no extra energy is needed. The finite element software FLUENT is used to simulate the force of viscous fluid dampers with different piston holes and different dynamic viscosity. The mechanical properties and the parameters influence rules are studied. The work and results obtained are as follows: (1) The numerical simulation of the prototype viscous dampers which have been tested on the mechanical properties has been carried out and compared with the test results. The feasibility of using the FLUENT software to analyze the viscous dampers and the correctness of the model are verified. At the same time, the characteristics of the internal flow field are obtained through the flow field diagram. (2) based on the finite element model of the dampers, the number of the finite element models is established. The influence of the structural parameters of the pore type viscous dampers and the viscous fluid dynamic viscosity coefficient on the mechanical properties of the viscous dampers is studied by the numerical simulation. Through the numerical simulation of the viscous dampers with various curvilinear holes, pore gap mixed type piston holes and thin-walled small pore structure, the open hole form on the damper is studied. The influence of mechanical properties. The kinematic viscosity of silicone oil is the main factor affecting the velocity index of viscous dampers. Increasing the cross section area of the piston can effectively reduce the velocity index. (3) the numerical simulation of the jet hole damper is carried out, and the influence of the structure parameters of the jet hole and the dynamic viscosity coefficient of the viscous fluid on its mechanical properties is studied. Increasing the size of the energy exchange chamber can effectively reduce the velocity index of the viscous damper in the jet hole.

【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】：2017
【分類號】：TU352.1

【參考文獻】

相關期刊論文 前9條

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本文編號：1783551