DevelopmentofanAutomaticLoadMoment ControlSystemforaFloatingDock

Abstract

A floating dock will be built, the manufacturer and owner is Baku Shipyard. POSS is the dock designer. TTS is installing a trolley transfer system so that vessels can be transferred into and out of the shipyard. HoppeMarineis in charge of the dock control and monitoring during the transfer operation. The goal of the project is to create an automatic control system which will plan, execute and monitor constantly the following: • Launching • Docking • Transfer Shore/Dock • Transfer Dock/Shore

Detailed static analysis has already been carried out to evaluate the transfer system operation. Using a maximum ship displacement of 5000 t, the moment curve and the loading sequence behaviour per meter advanced were determined. Preliminary results show that the variables controlling the process are the space between trestles, the load per trestle, the pump volumetricfloworRPMandthetrolleyspeed. Additionally,analysishasproventhattheballast system compensating the moment generated by the transferring ship cannot follow the trolleys at nominal speed for the first 40-50 meters. As a consequence, the trolley speed cannot be a constant value and must be reduced considerably at the beginning of the transfer. As many existing floating docks, gravity based filling was proposed, but the implementation of reversible pumps was preferred due to the low flexibility and time response of gravity based filling. The aim of this thesis, is a detailed description of the Dock Operation Control System and a Matlab simulation of the transfer from shore to dock. The concept of simulation is that it will be able to determine all the variables controlling the process by itself. Creating an algorithm defining the simulation requires constant consideration of factors such as which data is necessary, which data is optional and which restrictions to arise during the whole process. The simulation is intended to be used as a basis for the remaining transfer/docking processes and to generate on-board simulation software.