Investigation on vibration characteristics of moving sandwich plate floating on water

This research presents theoretical investigation to analyze vibration of axially moving sandwich plate floating on fluid. This plate is composed of balsa wood core and two nanocomposite face sheets where the three layers vibrated as an integrated sandwich. The fluid structure interaction (FSI) effects on the stability of moving plate are considered for ideal fluid. Halpin–Tsai model is utilized to determine the material properties of two-phase composite consist of uniformly distributed and randomly oriented CNTs through the PmPV matrix. The governing equations are derived based on sinusoidal shear deformation plate theory (SSDT) which is accurate than the conventional theories, and significantly, it does not require a shear correction factor. Employing Hamilton’s principle, the equations of motion are obtained and solved by semi-analytical method. Results indicate that dimensionless frequencies of moving sandwich plate decrease rapidly with increasing the water level and they are almost independent of fluid level when it is higher than 50% of the plate length. In addition, it is approved that when the plate is floated in denser fluid, the fundamentalnatural frequency of the plate takes lower values. The results of this investigation can be used in design and manufacturing of marine vessels and aircrafts.

Keywords:

Fluid structure interaction , Axially moving plate , Halpin- Tsai theory , Sandwich plate.