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

研究了薄壁结构在低重力条件下的非线性耦合动力行为。这个问题被细分为两个主题。部分约束液滴的自由振动分析对部分约束球形液滴进行了理论分析。并利用水滴进行了相应的实验研究。比较两种结果，得到了定性一致的结果。弯曲火焰附液结构动力特性试验研究采用塑料梁搭建，用弹簧和橡皮筋将结构吊装在顶棚上，模拟空间结构。附着液体用“弹簧质量”或“梁质量”来建模。用电磁励磁器对试验结构进行谐波激励，测量其谐波响应。采用三轴加速度采集，通过三维运动分析系统观察振动模式。

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.