抄録
The present study aims to optimize vibration characteristics of the fibrous composite plate with curvilinear fibers. Curvilinear fiber shapes are defined by the projections of contour lines for the surface which is expressed by multi-spline function. The curved surface of spline interpolation is defined by 25 data points, and their heights (z coordinates) are used as the design variables. The plate is limited to symmetric and balanced layup. Fundamental frequencies of the plate are calculated by an originally developed finite element code with iso-parametric 8-node elements. The optimization is carried out by applying a simple genetic algorithm with the maximum curvature constraint employed as the practicality index in the manufacturing process. Five different sets of boundary conditions are used in numerical experiments. Optimization results show that the curvilinear fiber shapes result in different shapes and higher fundamental frequencies for all boundary conditions, as they are compared to previous results where cubic polynomials are used to define for fiber shapes.
