Abstract
The robust structural optimization algorithms of a plate whig is proposed considering the bifurcation hi higher mode flutter, which affects the robustness of an optimum design and the convergence of an optimization. To improve the critical dynamic pressure of supersonic flutter under the constant total mass, the thickness distribution of a delta whig is considered as design variables. The constraints are proposed of keeping eigenvalues between adjacent modes apart by the specified distance which is composed of the sensitivity of the distance of eigenvalues. The numerical results indicate that the robustness of the optimum design is quantitatively obtained with the constraints.
