Preface Introduction 1. Fluid field equations and modal analysis in rigid containers 2. Linear forced sloshing 3. Viscous damping and sloshing suppression devices 4. Weakly nonlinear lateral sloshing 5. Equivalent mechanical models 6. Parametric sloshing (Faraday's waves) 7. Dynamics of liquid sloshing impact 8. Linear interaction of liquid sloshing with elastic containers 9. Nonlinear interaction under external and parametric excitations 10. Interactions with support structures and tuned sloshing absorbers 11. Dynamics of rotating fluids 12. Microgravity sloshing dynamics Bibliography Index.

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Liquid Sloshing Dynamics

Passive Energy Dissipation Systems for Structural Design and Retrofit

Research developments in vibration control of structures using passive tuned mass dampers

An investigation is made of the possible application of tuned liquid column dampers and tuned liquid column/mass dampers in reducing the along-wind response of wind-sensitive structures. The structure is modeled as a lumped mass multi-degree-of-freedom system taking into account both bending and shear. The wind turbulence is modeled as a stochastic process that is stationary in time and nonhomogeneous in space. A random vibration analysis utilizing transfer matrix formulation is carried out to obtain response statistics. The nonlinear damping term in the fundamental equation of the tuned liquid damper is treated by an equivalent linearization technique. Numerical examples show that tuned liquid dampers, which have significant practical advantages, are as effective as the traditional tuned mass dampers if the parameters of the liquid dampers are properly selected. However, excessive liquid motion in a tuned liquid column/mass damper may reduce the effectiveness of this damper. It is also shown that the wind-induced force- and acceleration-type responses of the structure with a damper, which is usually tuned to the fundamental frequency of the structure, should involve more than one vibration mode as higher-mode responses may become as large or even larger than the controlled-mode response.

Control of Along-Wind Response of Structures by Mass and Liquid Dampers

http://www.ce.nchu.edu.tw/Pic/Writings/114_Seismic%20response%20reduction%20of%20irregular%20buildings.pdf

Seismic response reduction of irregular buildings using passive tuned mass dampers

The Sydney Tower, the tallest building in Australia, is 820ft (250m) high and with the base of the structure anchored on the roof of a 15 storey building, it stands 1000ft (305m) above street level The tower is one of the first buildings with the installation of a large scale tuned mass damper (TMD) The doughnut-shaped water tank near the top of the turret, which normally serves as the tower’s water and fire protection supply, was incorporated into the design of the TMD to reduce wind-induced motions Energy associated with relative movements between the tower and the water tank is dissipated by 8 shock-absorbers installed tangentially to the tank and anchored to the floor of the turret A secondary TMD of similar design was later installed on the intermediate anchorage ring to further increase the damping level, particularly in the second mode Full scale measurements were taken to determine the natural frequencies of vibration and damping Dampings of the tower were determined for different damper configurations The natural frequencies of vibration were found to be 010 Hz and 050 Hz for the first mode and second mode respectively Significant increases in damping levels, particularly in second mode, are produced by the water tank tuned mass damper and the secondary damper

Kenney C. S. Kwok

Papers

Damping Increase in Building with Tuned Mass Damper