Dynamic optimization design for metal structure of 7 500 t floating crane

By applying the dynamic substructure method,a dynamical model is constructed for the 7 500 t floating crane.Accordingly,the global and local levels are dynamically optimized using the multi-level optimization method.In the global level,the dimensional parameters of global plane are optimized to increase the jib inherent frequency of bending mode within the hoisting surface.In the local level,the cross-sectional parameters of key substructures are optimized to enhance the dynamic stiffness.Through the dynamic optimization design,the metal-structure dynamic properties of the 7 500 t floating crane is effectively improved so as to promote the dynamic stiffness of the major modes.