THE EFFECTS OF TANK DEPTH ON THE NONLINEAR BEHAVIORS OF FLUID-MEMBRANE INTERACTION IN RECTANGULAR TANK

Focusing on the aerospace, the fluid and rubberlike membrane interaction forming as the rubber bag in the solid container which has been used for the 3 axis control satellite. In this study, the rubberlike membrane together with nonlinear sloshing-like behavior was used as the bladder tank container for interaction investigation. To overcome the moving boundary problem from the large deformation, an arbitrary Lagrangian-Eulerian (ALE) description was used to support the moving boundaries. The analytic model of rubberlike membrane and fluid interaction was evaluated by ALE with finite element using Newmark-beta and Newton Raphson method. This method based on the fluid-structure interaction equation. As well, the effects of tank depth on the nonlinear behaviors of fluid-membrane interaction in rectangular tank under the horizontal vibration were examined. The fluid-membrane interactions between under low excitation of 0.01 m/s(2) and high excitation 0.1 m/s(2) with the variation of tank depth were observed and compared by sloshing model. Effects of tank depth influencing on natural frequency, time history response and displacement of membrane were discussed. Successfully, the results confirmed that the nonlinearity of fluid was important in the larger amplitude excitation causing by low tank depth.