| The tank sloshing is an important and serious problem for liquefied natural gas(LNG)ships,oil-combination vessels(OBO),bulk carriers and liquid transport systems such as offshore tankers and liquid launch vehicles.Liquid sloshing is related to a variety of practical applications and engineering problems,such as the movement of the bridge Tank,the movement of liquid fuel on the aircraft during flight,and the response of large liquid tanks under earthquake.If the external excitation cycle is close to or equal to the natural cycle of the tank movement,the liquid in the tank is highly amplified,the free surface of the games in the solid structure of the important load,large liquid sloshing will lead to high local pressure and large total force,may be the direct cause of structural instability,Even the entire system has a fatal rupture,even the threat of life,at the same time,the research on the sloshing characteristics of tanks contributes to the structural design.The rectangular tank with baffle at the bottom is a common structure of loading liquid,and it is of great practical significance to study the problem of the rectangular liquid cabin sloshing with clapboard at the bottom.Based on the theory of linear potential flow,this paper studies the problem of liquid sloshing of two-dimensional rectangular tanks with baffles under external excitation.Dividing the rectangular tank basin into various sub basins,by using the method of separating variables to solve the Laplace control equation,the unique solution of the velocity potential of each sub basin is obtained,and the equations are set up according to the linear free surface condition,the normal velocity continuity and the pressure continuity to solves the unknown in an expression.By analyzing the identity of the method,we verify the correctness of the analytical solution process.In this paper,the results of the calculated tank motion are compared with those of other scholars,the similarities and differences are analyzed,and the correctness and reliability of the analytic method are also verified.The baffle in chapter II of this paper is fixed in the middle of the bottom of the tank,the rectangular tank is on the micro-amplitude reciprocating translation,focusing on the relationship between the height of the baffle,the position of the tank and the liquid resonant frequency in the tank,the influence of the external excitation frequency on the wave type,and the mechanism of inhibiting the elevation of free liquid surface by changing the height of the baffle.The third chapter,on the basis of the second chapter of the study,forced the baffle to be slightly oscillating,by changing the initial phase angle of forced motion of the baffle to restrain the wave surface elevation.In the fourth chapter,the baffle is free to swing,and based on Newton's third law,the angular velocity of the free motion of the baffle is solved,the motion response of the free oscillation is calculated,and the effect of free movement of baffle on tank-sloshing is studied. |
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