Dynamic response analysis of a liquid-filled cylindrical tank with annular baffle
Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India Journal of Sound and Vibration
(Impact Factor: 1.81).
07/2004; 274(1-2):13-37. DOI: 10.1016/S0022-460X(03)00568-6
Baffles are generally used as damping devices in liquid storage tanks. The focus of the present paper is to study the influence of a baffle on the dynamic response of a partially liquid-filled cylindrical tank. A baffle is assumed here to have the shape of a thin annular circular plate. The natural frequencies of an inviscid and incompressible liquid are determined for varying positions and dimensions of a baffle attached normal to the tank wall. The flexibility of both the baffle and the tank are considered in studying the effects of liquid–baffle and liquid–tank interactions on the sloshing mode frequencies. Finite element codes are developed and are then used to analyze both the liquid domain and the structural domain (i.e., the tank and the baffle). The coupled vibration frequencies of the tank–baffle system are computed considering the effect of sloshing of liquid. The results obtained for a liquid-filled elastic tank without a baffle and a rigid tank with a rigid baffle are in good agreement with the available results. The slosh amplitude of liquid in a rigid tank with and without a rigid baffle is studied under translational base excitation. The effects of the tank wall and baffle flexibility on the slosh response are also investigated.
Available from: Heng Jin
- "The use of vertical baffles may not only remarkably reduce the natural frequency of liquid storage tank systems but also reduce the sloshing amplitude and dynamic impact loads acting on tank walls (Armenio and Rocca, 1996; Wu et al., 2013; Xue et al., 2012). In addition to vertical baffles, alternative structures have been incorporated into tanks, such as annular baffles and flexible baffles in cylindrical tanks (Biswal et al., 2004), horizontal baffles in cubic tanks (Akyildiz and Unal, 2005, 2006; Liu and Lin, 2009) and annular baffles in rectangular tanks (Panigrahy et al., 2009). Among these inner structures, annular baffles proved most efficient. "
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ABSTRACT: Sloshing in a liquid tank may result in ship instability or structural damage. Inner structures are often used to restrain liquid sloshing and prevent tank damage. To increase energy dissipation and reduce the forces acting on structures, a horizontal perforated plate was designed and incorporated into a rectangular liquid tank in this study. Experimental studies were conducted, and a tank with an inner submerged horizontal perforated plate was excited under different amplitudes and frequencies. The free surface elevations on the side-walls and the resonant frequencies were carefully examined. The experimental results indicate that the horizontal perforated plate can significantly restrain violent resonant sloshing in the tank under horizontal excitation.
- "baffles, have been developed to reduce sloshing impact. These devices include the fixed horizontal baffle  , the fixed vertical baffle , and the ring baffle  . One common feature of these baffles is that they are rigid (or slightly deformable) and fixed in containers. "
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ABSTRACT: The recently developed Consistent Particle Method (CPM) is improved to eliminate pressure fluctuation such that fluid–structure interaction problems can be accurately simulated with a partitioned coupling procedure. The strategy of smoothing pressure is to combine a zero-density-variation condition and a velocity-divergence-free condition to enforce fluid incompressibility. The proposed algorithm is validated by hydrostatic and free-sloshing examples, which show better pressure results with less spurious fluctuations. Using the improved CPM, water sloshing with a constrained floating baffle (CFB) is successfully simulated. The effect of CFB in sloshing mitigation is investigated. Experimental studies are conducted to partially verify the numerical algorithm.
Available from: witpress.com
- "Generally, research has been focused on the natural frequencies, while vibration mode shapes and modal damping have been overlooked (Virella et al. ). Over the last decade, a number of new studies on the dynamics of partial filled cylindrical shells have been published (Biswal et al. ). One form of non–destructive testing that may be used to obtain information on the dynamic behavior of actual structures is the experimental modal analysis. "
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ABSTRACT: The experimental study of structural vibration is often performed to determine
the modal parameters of a structure or to verify the theoretical models and
predictions. The first phase of this research involved the experimental
determination of the modal properties of a rectangular steel tank with different
levels of water. The natural frequencies obtained from the experiments were
compared to those calculated by the analytical models. In the second phase, a
finite element analysis is carried out. The numerical results are compared with
the experimental values, and a very good agreement between experimental and
numerical results was obtained.
Keywords: modal test, rectangular tank, fluid-structure interaction, finite
For several decades, the fluid-structure interaction problem has been a
continuous challenging research subject in various scientific and engineering
applications, such as stationary liquid storage tanks, dam-reservoir systems,
nuclear reactors in fluid and tower-like structures (Rebouillat and Liksonov ).
The dynamic interaction between an elastic structure and a compressible fluid
has been the subject of intensive investigations in recent years. At present, the
most common approach being adopted is that the fluid and structure are coupled
and solved as one system. This system can be solved by numerous numerical
methods, such as finite element (FEM) (Ghaemmaghami and Kianoush ),
boundary element (BEM) (Kim et al. ) and coupled boundary element-finite
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