Overall Design And Hydrodynamic Performance Analysis Of Modular Floating Docks

As an important component of ocean engineering,floating docks are widely used in port terminals,offshore wind power,marine oil and gas,and other fields.The hydrodynamic performance of floating docks is a critical factor affecting their safety and stability.Their motion response is not only affected by environmental loads such as waves,tides,and winds but also involves the coupling effect between multiple-module floating bodies and mooring systems,which has complex force characteristics.This paper proposes a design scheme for a multi-module connected floating dock and analyzes its hydrodynamic performance using a typical island reef area in the South China Sea as an example to provide reference for the practical application of this floating dock scheme.The main research content of this paper includes:(1)Based on the design of a floating platform,two different floating platform configurations were proposed.The two configurations have different floating bodies,with one using a transverse cylindrical float and the other using a longitudinal cylindrical float.Due to the significant impact of the float configuration on its hydrodynamic performance,two configurations with the same displacement were designed for better comparison.Based on the overall layout of the proposed multi-module floating platform,a Y-shaped mooring system and an articulated connection scheme were designed.Taking a typical island reef sea area in the South China Sea as an example,design examples of the two multi-module floating platform configurations were provided.(2)Based on potential flow theory,a frequency domain and time domain analysis method for the hydrodynamic performance of the transverse cylindrical float configuration in the design example was established.According to the frequency domain analysis method,results including added mass,radiation damping,first-order wave excitation force,steady drift force,and motion response amplitude operator were calculated.Based on the time domain analysis method and considering the wind,wave,and current environmental conditions,a coupled analysis of the multi-module floating platform,mooring system,and connection structure was carried out,and the time domain motion response,mooring tension,and connection structure load under different environmental loads were calculated.The results showed that the motion response amplitude and mooring tension values of the transverse cylindrical float configuration were within a reasonable range.(3)According to the hydrodynamic analysis method of the floating platform,a comprehensive analysis of the frequency domain and time domain hydrodynamic performance of the longitudinal cylindrical float configuration in the design example was carried out.The results showed that the motion response amplitude of the longitudinal cylindrical float configuration was within a reasonable range,with the most severe roll motion occurring in the wave direction of 90 degrees.The maximum mooring tension value in different wave directions appeared at the Y-shaped mooring cable of the middle module,with a safety factor greater than 1.67,which met the design requirements.(4)A comparative analysis of the hydrodynamic responses of the two floating platform configurations was carried out for typical working conditions.Under the wave directions of90 degrees and 45 degrees,the motion response of each degree of freedom of the transverse cylindrical float configuration was superior to that of the longitudinal cylindrical float configuration.Moreover,the maximum mooring tension value and maximum connection structure load of the transverse cylindrical float configuration were smaller than those of the longitudinal cylindrical float configuration.However,the transverse cylindrical float configuration did not show an advantage in motion response and mooring tension under the wave direction of 0 degrees.In engineering applications,the hydrodynamic performance of the transverse cylindrical float configuration is better as the floating platform is mainly subjected to wave directions of 90 degrees and 45 degrees.