3Malawi. Optimal frequency design of wind turbine blades [ J ]. Wind Engineering and Industrial Aerodynamics, 2002, 90 ( 8 ) : 961 - 986.
4Saravanos D A. A shear beam finite element for the damping anal- ysis of tubular laminated composite beams[ J]. Journal of Sound and Jrbration, 2006, 29 (3) : 802 - 823.
