Research On Positioning Control Simulation Experiment Of Mooring System

Based on the semi-submersible platform positioning control, the paper aimed to design ofmooring control system, that is, which could keep the position of platform in safety region bywrapping of anchor chain. Considering the difficulty of mooring system test in realenvironment and expensive cost of equipment, so the paper combined the semi-physicalsimulation technology with mooring control system as experimental equipment. According toproject requirement and the actual situation, we need to test the mooring control system effectand experimental data, when platform is in different levels of sea condition.According to the mooring control system theory, this paper is mainly divided into four parts.1、the implementation plan of mooring control system is put forward. Learning about Theplatform positioning control technology in details is necessary to compare the advantages anddisadvantages of two different position control technology; based on the mooring positioningcontrol principle, the semi-submersible platform mooring control process is put forward.2、putting forward to experiment scheme of mooring system with semi-physical simulation.Considering the cost saving and some physical equipment can’t be taken in experiment, so thispaper combined the semi-physical simulation technology with mooring control system as atest equipment, we can use mathematical model instead of some equipment which could berepresent with mathematical model, then these mathematical model could realize themovement of the response in the industrial computer simulation equipment.3、a mathematical model is put forward. After access information about test and learn aboutactual situation, environment disturbance model about platform is gotten, such as thedisturbing force and disturbance torque model of South China Sea wind, wave and flow.Given platform several direction motion model in low frequency band. Given anchor motionmodel. Given force value calculation model of anchor chain. Combined with thecharacteristics of the platform response curve, given the fuzzy-controller design principle andcontrol process, finally realizing the mooring system accurate position; In order to reduce theconsumption of mooring system, using genetic algorithm to optimize the force-value of chainto ensure platform position can be controlled stability, accurately.4、Mooring system connection and experiment. After given all the simulation module ofmathematical model and physical device, the mathematical model and controller according tothe computer simulation technology is required to program and forming a digital controlsystem; In order to facilitate the operation of the staff, according to the man-machine interfacedesign requirements, a man-machine interface for monitoring is designed with VC language; Then through the serial port connection to realize human-machine interface, mathematicssimulation control system and the physical equipment connection, form a real-time simulationof the mooring system; Given the South China Sea disturbance in a year or ten years seacondition, and semi-submersible platform trajectory and data is gotten, in the end we make anconclusion about the mooring control simulation system design.Upon the simulation results, according to the platform motion curves and data adjust themodification controller and mooring control simulation system design scheme, keep theplatform positing more accurate, stable and rapid positioning of the target.