Dynamic response analysis of a liquid-filled cylindrical tank with annular baffle
ABSTRACT 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.
- SourceAvailable from: ocean.kisti.re.kr[Show abstract] [Hide abstract]
ABSTRACT: An analytical method for the hydroelastic vibration of a vessel composed of an upper annular plate and a lower circular plate is developed by the Rayleigh-Ritz method. The two plates are clamped along a rigid cylindrical vessel wall. It is assumed that the fluid bounded by a rigid cylindrical vessel is incompressible and non-viscous. The wet mode shape of the plates is assumed as a combination of the dry mode shapes of the plates. The fluid motion is described by using the fluid displacement potential and determined by using the compatibility conditions along the fluid interface with the plate. Minimizing the Rayleigh quotient based on the energy conservation gives an eigenvalue problem. It is found that the theoretical results can predict well the fluid-coupled natural frequencies comparing with the finite element analysis resultTransactions of the Korean Society for Noise and Vibration Engineering. 01/2005; 15(8).
- [Show abstract] [Hide abstract]
ABSTRACT: The coupled vibration characteristics for the fluid-structure interaction systems are investigated through the finite element method. The present paper is focused on vibration characteristics of the cylindrical fluid-storage tank with a baffle. The tank is partially filled with an inviscid and irrotational fluid having a free surface. A baffle is assumed here to have the shape of a thin annular plate and a conical shell, attached to the cylindrical tank and positioned below the fluid surface. The liquid domain is limited by a rigid flat bottom. As the effect of free surface waves is taken into account in the analysis, the bulging and sloshing modes are studied. To demonstrate the validity of present results, they are compared with the published ones. The effect of positions and inner-to-outer radius ratio of annular baffle and setting angles of conical baffle on coupled vibration characteristics is investigated. 섂 ?돀??? ??? 肴?? ??? ? ?돐 ??? ??? /???? ? ?덐 ? ? ? ?돐??? ??? ??? ??? ? ?돐 ??? ??? ??? ? ?덐 ??? ? 老 ?淙?堈 ? ? ? 꼀 ? 끮?? ?? は?? ?? ? ?돐??? ??? ??? ??? ? ?돐 ??? ??? 衷?? 脂 ?덐 ??? ? ? ???堈 ? ? ?돀??? ??? 傅?? ? ?돐 炅?? ??? ??? 뤏 ?덐 ??? 렏 ? 낅?? ? 낅?? 삅?? ?? 삅?? ?腺 ?? ??? ???Transactions of the Korean Society for Noise and Vibration Engineering. 01/2005; 15(1).
- [Show abstract] [Hide abstract]
ABSTRACT: In this paper, the forced vibration problem of an Euler-Bernoulli beam that is joined with a semi-infinite field of a compressible fluid is considered as a boundary value problem (BVP). This BVP includes two partial differential equations (PDE) and some boundary conditions (BC), which are introduced comprehensively. After that, the closed-form solution of this fluid-structure interaction problem is obtained in the frequency domain. Some mathematical techniques are utilized, and two unknown functions of the BVP, including the beam displacement at each section and the fluid dynamic pressure at all points, are attained. These functions are expressed as an infinite series and evaluated quantitatively for a real example in the results section. In addition, finite element analysis is carried out for comparison.Interaction and multiscale mechanics. 01/2013; 6(4).