Dynamic analysis was conducted for two flexible composite structures coupled by a fluid medium. As the dynamic loading is applied to one structure, the other structure responds to the dynamic loading resulting from the load transfer through the fluid medium. To investigate such a coupled interaction between two structures, both experimental and numerical studies were conducted to supplement each other. First, a series of experiments were undertaken for two separate composite plates. In the designed test setup, water was filled between two composite plates. The water level between the two plates was varied and strain gages were attached to the composite plates. An impact load was applied to the front composite plate, and the dynamic responses of the both plates were measured using the strain gages. The cellular automata (CA) technique was also used for the numerical study. The results showed that the fluid-structure interaction (FSI) played an important role for the structural coupling depending on the water level between the plates.
An experimental study was conducted for the fluid-structure interaction (FSI) of the vibration of a flexible structure inside the channel driven cavity flow (CDCF). The structure was a thin flat plate whose one edge was clamped at the bottom of the three-dimensional CDCF system. Both aluminum and composite plates were examined. Initially the vibrational characteristics of the structures were measured without fluid flow. Subsequently, each structural vibration was measured under various flow rates through the CDCF system. The structural vibration was measured using strain gages attached to the structures as well as non-contact displacement sensors. Time histories of the strains and displacements were obtained, and their time averages and the vibrational magnitudes were computed as a function of the nominal flow rate through the channel cross-section. This set of test data is expected to be useful for validation of a computer program for analyzing a FSI problem.
Dynamic loading can be transferred from one structure to another via fluid media with fluid-structure interaction (FSI). Previous studies demonstrated that FSI played a critical role for polymer composite structures in contact with water because their material densities are very comparable to that of water. This paper studied the structural coupling effect through a fluid medium contained among the structures. This study was an extension of the previous experimental work reported in Kwon and Bowling (Multiscale Multidiscip Model Exp Des 1(1):69-82, 2018). Composite structural stiffness, spacing and the number of coupled structures were varied in the experiments to determine their effects. The experimental results showed that the effects of different parameters on the structural responses of couple structures were quite complex, and they have to be well understood for proper design of coupled structures via a fluid medium.
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