Free vibration (or eigenvalue analysis) is a prerequisite for aeroelastic analysis.\nFor divergence analysis, slope influence coefficients (rotation at point i due to unit load at point j) are\ncalculated using free vibration mode shapes and corresponding frequencies. The lowest eigenvalue is\nof interest and gives the divergence speed. The present paper considers the maximization problem of\neigenfrequencies for composite panels. The influence of boundary conditions and constant or variable\nstiffnesses on optimization results are investigated herein. A new convenient set of design variables\nis employed in the analysis. The computations are carried out with the use of the Rayleighâ??Ritz\nmethod and Finite Element analysis (2D quadrilateral and 3D solid elements).
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