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

Flexible structures may experience excessive levels of vibration under the action of wind , adversely affecting serviceability and occupant comfort. To ensure the functional performance of a structure, various design modifications are possible, ranging from alternative structural systems to the utilization of passive and active control devices. This paper presents an overview of state-of-the-art measures that reduce the structural response of buildings, including a summary of recent work in aerodynamic tailoring and a discussion of auxiliary damping devices for mitigating the wind-induced motion of structures. In addition, some discussion of the application of such devices to improve structural resistance to seismic events is also presented, concluding with detailed examples of the application of auxiliary damping devices in Australia, Canada, China, Japan, and the United States.

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Mitigation of motions of tall buildings with specific examples of recent applications

Recent Advances in Liquid Sloshing Dynamics

The dynamic characteristics and effectiveness of multiple mass dampers (MMDs), a collection of several mass dampers with distributed natural frequencies, under random loading are investigated in this paper. The MMD attached in a parallel configuration modifies the transfer function of the damper-building system by flattening the peaks observed in a typical single tuned mass damper-building transfer function. The MMD parameters considered here include the frequency range of MMDs, damping ratio of individual dampers, and the number of dampers. Uniform and variable frequency increments in a specified frequency range and mass variation alone, and in combination, are considered. The secondary inertial effect can be represented by conventional mass dampers or liquid sloshing or oscillating liquid column dampers. A parameter study is conducted to delineate the influence of several parameters on the effectiveness and robustness of MMDs in comparison with a single tuned mass damper (TMD). The random loads considered here include wind and seismic excitations. It is demonstrated that the MMD configuration is more effective in controlling the motion of the primary system. It offers the advantages of portability and ease of installation (because of the reduced size of an individual damper) which makes it attractive not only for new installation, but also for temporary use during construction or for retrofitting existing structures.

W.-J. Sun

Papers

Stochastic response of structures with fluid-containing appendages