Nonlinear Coupled Dynamic Behavior of Liquid and Thin-Walled Structure in a Low Gravity Condition

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Nonlinear coupled dynamic behavior of a thin-walled structure attached with liquid in a low gravity condition has been investigated. The problem was subdivided into two subjects.I. Free vibration analysis of a partially constrained liquid dropTheoretical analysis has been conducted for a spherical liquid drop partially constrained. And using a water drop, corresponding experimental studies have been carried out. Comparing both results, qualitative agreement was obtained.II. Experimental study on dynamic behavior of flexural flame structure attached with liquidTest structures were constructed with plastic beams and hanged from the ceiling with spring and rubber band, which modeled as structure in space. Attached liquid was modeled by "spring-mass" or "beam-mass". Test structure was harmonically excited by electro-magnetic exciter to measure the harmonic response. Three-axis acceleration pick-up was used and vibration mode was observed by three dimensional motion analysis system.