Author(s): Shao Min Wang; Xie Qiu Yang; Tai Ping Yuan
Keywords: Truss and plate frame hybrid structure; Mariculture ship; Hydrodynamic performance; Motion response
Abstract: In recent years, mariculture in deeper and farther waters has attracted much attention, and the optimal design and development of large-scale aquaculture facilities has become an urgent need. To study the hydrodynamic performances of a mariculture ship composed of truss structure and several floating bodies with plate and frame structures, we analyzed the hydrodynamic characteristics of the ship based on three-dimensional potential flow theory and Morison theory. Through the analysis of hydrodynamic parameters and motion responses, we get the changing trend of the main performance of mariculture ship. The results show that the added mass and radiation damping of mariculture ship are sensitive to the change of frequency, and the sensitivity is obviously different in all motion directions. The added mass and radiation damping of rotational motion are larger than those of plane motion, which are closely relate to the structural type of mariculture ship. Under the action of incident waves in different directions, the first-order wave force on mariculture ship increases at first and then decreases with the increase of frequency, and the first-order wave force curve in high frequency section tends to be stable under the action of incident waves in different directions. There is a great difference in the medium and low frequency section. Under the conditions of high frequency and low frequency, the ship motion is small, but it resonates when encountering medium and short period waves. The surge and pitch of mariculture ship are the main motion modes in head or follow wave condition, and the roll and heave are the main modes of motion in the beam wave. This study lays the theoretical basis for optimal design of subsequent mariculture ship and the safe implementation of marine aquaculture facilities afterwards.