Dynamic response analysis of the installation system during hoisting and mating phases using a floating vessel. Part Ⅱ: Application

The installation of large-scale wind turbine blades is a process characterized by cumbersome operating procedures, complex dynamic responses, and limited weather window. Accurate analysis and evaluation of the responses of the installation system throughout the hoisting and mating phases are crucial for providing effective guidance in offshore operations. However, most current research focuses on individual phases rather than the entire process. Therefore, based on the analysis model of the blade installation system established in Part I of this research, a systematic investigation of the dynamic responses of the entire hoisting and mating phases is conducted. The dynamic responses of the vessel, crane, and double pendulum system are analyzed under typical cases, revealing the characteristics of response amplification and frequency coupling. Moreover, oscillations of the blade and tensions in the suspension cable are evaluated under variable environmental conditions. During the hoisting phase, changes in the length of the suspension cable may cause the modal period of the double pendulum system to approach the periods of the environmental loads and natural periods of the vessel, leading to a significant amplification of the system responses. The oscillations of the blade during installation can be reduced by shortening the length of the suspension cable.