The Rule Amelioration Research Of DP System Based On A Platform Supply Vessel

Dynamic positioning system(DPS)has been widely used in the shipping and platform engineering fields,as it can ensure the ship remain in a relatively fixed position of the sea while in deep sea operation and is not affected by the sea environment.It has become the necessary key equipment in the PSV and other special purpose engineering ships,deep water oil drilling platforms,drilling ships,FPSOs and so on.The related literature research focused on the automatic control system,thrust allocation system,position reference system and sensor system level,and a lot of achievements has been made.But in the field of marine equipment,the rule on dynamic positioning system update is not timely,and some key technical requirements are not clear.In order to do a better job on technical support work and play the classification leading role in the industry,in this paper,the theory and experiment of dynamic positioning system is studied based on an offshore platform supply vessel.Suggestion for improvement of DP system is put forward according to the simulation and experimental results.This research has practical significance for guiding the further development of Ocean Engineering.This paper firstly systematically analysed and compared the DP technical requirements between IMO and the main classification of the world,introduced the notation、definition、configuration and equipment composition in CCS rule,and identified a number of deficiencies of the rule.The existing DP system control model is studied based on control engineer and ship power kinematical theory.The traditional control model、DP-PID control model and DP-Fuzzy model were set up and their core technology were compared.The simulation design and simulation analysis were made tightly combining the title vessel and its data.The simulation adopt the main sea state and sea area data of this type of vessel.The control efficiency of four control models—mooring control,DP-PID,DP-Fuzzy(Fuzzy,one of Fuzzy-Cur and Fuzzy-wave)were compared.The simulation research results indicated the fuzzy control model is more suitable for DP system of this kind of offshore platform.The paper further analyzed the title vessel’s DP component and arrangement and studied the vessel’s DP-3 rule conformance.The experiment design covers 15 items considering the performance need and manoeuvring model.It demonstrated that the DP system based on DP-Fuzzy has better positioning efficiency,through vessel trial and FEMA verification.Finally,several advices raised for CCS rule including control accuracy,trial environment,control model select and thrust optimizing based on simulation,trial,existing rule,、the inadequacy of existing rule especially.