VIBRATION OF CANTILEVERED COMPOSITE TRIANGULAR AND TRAPEZOIDAL DOUBLY-CURVED SHALLOW SHELLS

The first known vibration analysis of composite cantilevered shallow s hells having right triangular and trapezoidal planforms is conducted. Accurate frequencies are obtained using the Ritz method with algebraic polynomials. This is demonstrated by detailed convergence studies. Th e lowest six natural frequencies for these shallow shells with double curvature are listed. Effects of curvature, material orthotropy and la mination angle on the natural frequencies are investigated.