Dynamic positioning system design for 7 500 t floating cranes

Pertaining to the 7 500 t 'Blue Whale' floating crane,a mathematical model of high-and low-frequency motional and environmental loadings is established for floating crane ships.Compared with traditional ships,the horizontal motions of floating cranes,which are resulted from the rotary-loading inertial forces,are quite different.By analyzing the dynamic responses to floating cranes under complicated sea conditions,an approach integrating the rotary-loading inertial force with dynamic positioning system is proposed based on the Kalman filtering and Mamdani fuzzy inference methods.Furthermore,a simulation experiment is applied to keep the floating crane in the working area.Therein,this approach sets a reference to future research and manufacturing on the dynamic positioning system of giant-scale floating cranes.