| Very Large Floating Structures(VLFSs)are the basic equipments aimed at protecting the national marine rights and interests and exploiting the ocean resources.Meanwhile,VLFSs are a type of huge ocean engineering equipments with a 1000-meter-level size different from the traditional 100-meter-level ships and offshore platforms.So considering its efficient and feasible productions,installations and transportations,the multi-module floating platforms are dominated in its design process,in which the adjacent floating modules are usually connected by flexible connectors.The flexible layout and assembly of the floating modules contribute to a variety of complex topological configurations for the floating platforms.The multidirectional flexible connection systems exist with the floating modules are the key to maintain the security and stability of the complex-configuration platforms.Focusing on the engineering application prospects and design demands of VLFSs,this paper investigates the connector design and dynamic characteristics of the connection systems with multidirectional layouts for typical complex-configuration platforms.Firstly,by simplifying the complex-configuration platforms as a rigid-flexible coupled multi-oscillator network system with rigid modules and flexible connectors,we establish the network dynamic model of the multi-oscillator network system based on the Network Modeling Method and the Linear Hydrodynamic Theory.For the multidirectional flexible connection system,this paper proposes a high-efficient dynamic analysis model for the face-contact connector with multi-directional layouts of the complex-configuration platforms based on PYTHON-ABAQUS co-simulation taking the material properties and fine structure into account comprehensively.In the high-efficient dynamic analysis model,the equivalent mechanical model of the face-contact connector with multidirectional layouts can cooperate with the dynamics model of floating system to carry out real-time coupled dynamics calculation and analysis,and the motion responses of modules can be selectively fed back to the real-time stress and tension analysis of the connectors.Secondly,based on the several typical complex-configuration platforms assembled by the rectangle-type and triangle-type semi-submersible-type floating modules,we study the effects on dynamic response characteristics of the key parameters of the connection systems with multidirectional layouts.Considering the loads of connectors and the displacements of floating modules,the optimal design of connector stiffness configuration is carried out for the connection system with multidirectional layouts of the several typical complex-configuration platforms.Aiming at the layout of the connection system of complex-configuration platform with multidirectional section,we investigate the influence laws of the connector layout along the connection end face on connection load,and the load-sharing mechanism of connection system with multidirectional layout is revealed.Thirdly,based on the multidirectional flexible constraints and load-bearing requirements of complex-configuration platforms and the reasonable design of the key parameters of the connection system with multidirectional layout,we design a trapezoid-type face-contact connector with the function of fast docking and separation,which is applied to the hexagon complex-configuration platform to bear multiple-dimension heavy loads such as tension,compression,bending and shearing.Through the established high-efficient dynamic analysis model,the numerical evaluation for multidirectional face-contact connection system is carried out,which reveals the excellent load-bearing performance of the face-contact connector with multidirectional layout.Based on the water tank experiment results,the effectiveness of the proposed high-efficient time-domain dynamic analysis method for the face-contact connectors with multidirectional layouts of complex-configuration platform is verified. |
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