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《Periodical of Ocean University of China》 2017-12
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Simulation of Damping Force of Tuned Liquid Damper with Shallow Water

DONG Sheng;CHEN Geng;College of Engineering,Ocean University of China;  
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 front is broken.Kinetic energy is dissipated violently,which enhance the effectiveness of structural vibration control.The shallow internal liquid depth of TLD has an impact on vibration control,in which liquid movement is intense and dissipate more kinetic energy.
【Fund】: 国家自然科学基金项目(51479183)资助~~
【CateGory Index】: TB535
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