浅水调谐液体阻尼器阻尼力的模拟研究  

Simulation of Damping Force of Tuned Liquid Damper with Shallow Water

作　　者：董胜[1] 陈更[1] 

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2017年第12期110-117,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(51479183)资助~~

摘　　要：调谐液体阻尼器(TLD)是有效的结构减振装置。TLD在激励作用下内部液体运动属于晃荡问题。本文建立了求解二维不可压缩Navier-Stokes方程的数值模型。数值模型采用对时间积分的分步方法求解压力项,THINC格式捕捉自由面。利用晃荡试验数据验证了模型计算结果的正确性。模拟了不同深度的浅水TLD在不同频率激励作用下内部液体的运动,计算了TLD晃荡产生的阻尼力。分析激励频率对TLD中液体运动的形态和阻尼力的影响。浅水TLD中液体运动形态主要为行波。TLD产生的阻尼力受激励频率影响,在固有频率附近产生共振现象,阻尼力大,减振效果理想。Tuned liquid damper（TLD）is an effective equipment for structural vibration control and is applied in different areas.To study and maximize the effect of TLD vibration control,the mechanics of TLD is of great significance.The reaction of liquid in TLD is a sloshing problem.Sloshing is the liquid movement in a limited space（tank）and interaction with the container.The reaction of liquid in the tank is dynamic pressure due to liquid movement.The dynamic pressure is called damping force,which is the main factor of TLD vibration control.To calculate the damping force of TLD,computational fluid dynamics model is set up.The model is based on finite difference method to solve the two-dimensional incompressible Navier-Stokes equation.The Constrained Interpolation Profile（CIP）method is used in fractional step approach to solving pressure term and Tangent Hyperbolic Interface Capture（THINC）scheme,which is accurate and needs no geometry reconstruction,is employed to determine free surface location.The numerical model is validated by sloshing simulation compared with experiment data.The result shows good agreement with experiment data and the model is efficient and could simulate pressure accurately.The damping force is calculated by liquid pressure exerted on tanks.Different cases are simulated to study the effect of water depth and the excitation frequency of TLD.The TLD is under the harmonic excitations.Three different water depths are considered and every different depth cases are tested under seven excitation frequencies from 0.8ω1 to 1.4ω1.ω1 is the natural frequency of TLD.Results show that traveling-wave is the main form of liquid moves in TLD under external excitations.Waves break when the water is shallow and excitation is near the natural frequency.The frequency of excitation has great influence on the damping effect of TLD.When the frequency is close to the natural frequency of TLD,the resonance phenomenon occurs,and the motion of the liquid is intense,the damping force is large,and the wave fron

关 键 词：调谐液体阻尼器 晃荡 CIP 数值模拟 

分 类 号：O353[理学—流体力学]