论文标题
使用调谐液体阻尼器（TLD）减少湍流诱导的非线性动态振动
Reduction in turbulence-induced non-linear dynamic vibration using tuned liquid damper (TLD)
论文作者
论文摘要
在本研究工作中，试图在有限体积差差（FV-FD）框架中开发一个耦合的非线性湍流结构模型。调谐液体阻尼器（TLD）与固有的结构阻尼一起用作附加阻尼系统。可以使用开发的模型对流动激发桥梁或烟囱部分的实时模拟以及使用TLD的振动减少。使用OpenFOAM瞬态PISO求解器对结构周围的湍流场进行建模，并计算时间变化的阻力。这种力使结构呈现，从而导致附着的TLD的晃动现象，并使用浅深度近似建模，阻尼结构的流动诱导的振动。带有和不带有附件TLD的结构运动是使用内部MATLAB代码的基于FD的NEWMARK-BETA方法建模的。 TLD通过低雷诺数流的涡流频率调节，发现它正在大大降低结构激发。另一方面，高雷诺数湍流表现出一种宽带激发，为此，通过调整TLD，几乎没有通过研究获得的频率，可以观察到振动的良好降低。
In the present research work, an attempt is made to develop a coupled non-linear turbulence-structure-damper model in a finite volume-finite difference (FV-FD) framework. Tuned liquid damper (TLD) is used as the additional damping system along with inherent structural damping. Real-time simulation of flow-excited bridge box girder or chimney section and the vibration reduction using TLD can be performed using the developed model. The turbulent flow field around a structure is modeled using an OpenFOAM transient PISO solver, and the time-varying drag force is calculated. This force perturbs the structure, causing the sloshing phenomena of the attached TLD, modeled using shallow depth approximation, damping the flow-induced vibration of the structure. The structural motion with and without the attached TLD is modeled involving the FD-based Newmark-Beta method using in-house MATLAB codes. The TLD is tuned with the vortex-shedding frequency of the low-Reynolds number flows, and it is found to be reducing the structural excitation significantly. On the other hand, the high-Reynolds number turbulent flow exhibits a broadband excitation, for which by tuning the TLD with few frequencies obtained through investigations, a good reduction in vibration is observed.
