Investigation On Dynamic Response Of Multiple Body System In Waves

With the exploration of the marine field in various countries,the multi-floating system has attracted extensive attention in the field of ships and marine engineering,such as multiple ships in offshore replenishment operations and multi-module floating bridge.Due to the coupling effect between multi-floating bodies and the interaction between waves and multi-floating bodies,the dynamic response characteristics of multi-floating bodies are significantly different from that of a single floating body.Therefore,the research on the dynamic response characteristics of multi-floating system under the action of waves is carried out in this paper.In this paper,the coupling mechanism of multi-floating systems under the action of waves is studied.Firstly,based on the three-dimensional potential flow theory,taking into account the hydrodynamic interference between floating bodies,the dynamic response characteristics of the multi-floating body system in the frequency domain were studied.Secondly,based on the idea of motion decomposition,a low-frequency time-domain motion equation for a multi-floating system under the combined action of second-order wave load,wind load,and flow load is established,which can also take into account the dynamic positioning system and collision load.Time-domain simulations of fixed-space replenishment and relied on replenishment are carried out.The motion response characteristics and collision load characteristics of the floating body in the two operations are mainly studied.It provides effective numerical calculation methods for engineering applications of deep-sea replenishment operations.Finally,for the multi-floating system with larger size and lower stiffness,the frequency domain hydroelastic method based on the discrete module idea is used,which is introduced the articulation constraint matrix to establish the kinematic equation of the multi-floating system under the action of waves.The hydroelastic response of the multi-floating system is predicted.