| In response to energy shortages and climate change,global offshore wind power is developing rapidly,and wind farms are gradually developing from offshore to far sea.As a means of offshore transportation,wind power operation and maintenance vessels are an indispensable part of offshore wind farm operation and maintenance,and whether the operation and maintenance ships can arrive at the wind farm in time is an important criterion for measuring operation and maintenance vessels.In this thesis,the arrangement of propulsion devices on small pieces is demonstrated on the basis of asymmetric catamarans,and the resistance and seakeeping performance of asymmetric catamarans are studied,and a ship type scheme with better performance is sought.Taking an asymmetric twin-hull wind power operation and maintenance ship as the parent vessel,the small piece body was demonstrated and analyzed,the ship resistance and propulsion performance of the small piece were estimated,and the profile line and main scale elements of the small piece were determined according to the selected main engine size and the cabin layout space requirements,and the hull model was established in NAPA.Taking the constructed asymmetric catamaran model as the basic ship type scheme,the first type line change of the large piece,the longitudinal position change of the small piece and the change of the ratio of the displacement volume of the large and small piece to the total displacement are carried out on the basic ship type model of the asymmetric catamaran,and the conventional catamaran and trimaran are used to verify the effectiveness of the meshing in the simulation calculation method,and the resistance simulation calculation of the asymmetric catamaran series ship type scheme is calculated by this meshing.According to the simulation results,it can be seen that the resistance of each scheme of the series ship type is improved compared with the parent ship,and the hydrostatic resistance is the most obvious when the first profile line of the large piece is changed.Referring to the relevant literature,the numerical pool calculated by CFD simulation was constructed,and the STAR-CCM+ software was used to simulate the wave resistance simulation of the resistance resistance under the design speed,the simulation analysis of the longitudinal and heaving motion of the series of ship types at the design speed,and the analysis of the roll and pitch motion of the asymmetric catamaran at the plus or minus 45°wave angle,the influence of the change of displacement volume on the wave drag increase was greater than that of the other two series of ship type schemes.The bulb-bow type boat shape scheme has an excellent influence on the pitching movement.When the ratio of wavelength to captain is small,the ratio of the displacement volume of the large and small pieces to the total displacement is better when the roll movement at the wave angle of 45° is small.The data in the numerical simulation results are used as the evaluative indicators for the selection of the ship type scheme,and a composite weight comprehensive evaluation model combining subjective level and objective level is established,and the ship type scheme with better comprehensive index is selected through the composite weight TOPSIS evaluation model.The placement and arrangement of the propulsion device in the small piece position of the asymmetric catamaran and the calculation of the resistance and seaworthiness of the asymmetric catamaran enrich the shape design of the offshore wind power operation and maintenance vessel,and provide a certain research reference for the relevant research methods and designs of asymmetric catamarans. |
