基于数值模拟的粘滞阻尼器力学性能研究

发布时间：2018-04-21 18:10

本文选题：粘滞阻尼器 + FLUENT数值模拟　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：随着经济的发展,各种超高层建筑物、跨海大桥大量涌现,为了提高这些结构的抗震(振)性能,行业内对这些结构的隔震与耗能减振的要求越来越高。粘滞阻尼器作为一种减震(振)装置,早在20世纪70年代便已经出现。随着近几十年的发展,粘滞阻尼器产品的力学性能日趋完善,也被越来越多的结构所应用。粘滞阻尼器是一种速度相关型阻尼器,通过外部结构的振动带动活塞杆的运动,使内部粘滞流体流动,通过粘滞流体与阻尼孔的摩擦达到耗能减震的目的。它对结构振动的控制属于被动控制,即不需要额外的能量驱动。论文采用有限元软件FLUENT,对不同活塞孔结构形式、不同动力粘度的粘滞流体阻尼器出力进行数值模拟,研究它们的力学性能及其参数影响规律。开展的工作及取得的成果如下所示:(1)对已进行力学性能试验的原型粘滞阻尼器进行数值模拟,并与试验结果进行对比分析,验证了采用FLUENT软件数值分析粘滞阻尼器的可行性和模型的正确性。同时通过流场图获得了其内部流场特征。(2)基于所建立的阻尼器有限元模型,数值模拟研究了直孔型孔隙式粘滞阻尼器各结构参数及粘滞流体动力粘度系数对粘滞阻尼器力学性能的影响规律。通过对各种曲线孔、孔隙—间隙混合型活塞孔及薄壁小孔结构形式的粘滞阻尼器的数值模拟,研究了开孔形式对阻尼器力学性能的影响特点。硅油运动粘度是粘滞阻尼器速度指数的主要影响因素,增大活塞过流断面面积能有效地降低速度指数。(3)对射流孔阻尼器进行了数值模拟,研究了射流孔各结构参数及粘滞流体动力粘度系数对其力学性能的影响。增大能量交换室尺寸能够有效地降低射流孔粘滞阻尼器的速度指数。
[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.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.1

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