An Experimental Study on the Vibration Characteristics of Kevlar/Ep Sandwich Plate with Unsymmetrical Faces and Aluminum Honeycomb Core Sandwich Structure

摘要

In the design of high-speed vessel, the weight saving is considered as the most important area. The sandwich structure has been known as having an excellent strength with a relatively low density ratio. Since the sandwich type has higher bending rigidity for the same cross section over to other types, it can have longer frame distances. Therefore, the sandwich structure can reduce the weight significantly. In this study, three different types of plate vibration characteristics are compared. First part of this study is an experiment for aluminum honeycomb core sandwich plates that have different face thickness and cell sizes with all clamped boundary condition. The experimental data are compared with analytical solution and the simulation data obtained from NISA (Numerical Integration Elements for System Analysis, Finite Element Method Package Program). Second part of the study is an structural experiment for Kevlar/Ep FRP sandwich that have unsymmetrical faces. The experimental data are used for analytical solution. In this thesis, the Reissner-Mindlin's plate theory shear deformation and rotary inertia were considered is studied from Hamilton's principle and rectangular sandwich model is applied to the plate theory. This thesis is that the results of the equation of motion given by Hamilton's principle compared with that of Rayleigh-Ritz method given by energy relationships. Third part of the study is an experiment for stiffened plate which have equivalent mass to aluminum honeycomb core sandwich plates. The experimental data are compared with that of aluminum honeycomb core sandwich plates. The result can show that aluminum honeycomb core sandwich plate is more stiff than stiffened plate in the equivalent mass condition. Fourth part of the study is an experiment for idealized midship section of high-speed vessel which is composed of aluminum honeycomb core sandwich plate, and then compare experimental data with the NISA (Numerical Integration Elements for System Analysis, Finite Element Method Package Program) simulation data. This study will illustrate the vibration aspects of sandwich structure and also provide the designer with a general guideline for vibration characteristics of aluminum honeycomb core sand-wich(AHCS) structure and anti-vibration design criteria.