Research On Dynamic Positioning Control System Based On Failure Mode And Effects Analysis

With the continuous development of the dynamic postioning vessel applied in various fields, for example, deep-sea mining, cabling, piping, drilling and so on, dynamic positioning technology has been used more and more widely. Subject to various factors,.dynamic positioning vessels which working in deep-sea with high risks, so its capabilities of the security operation has been growing more and more attention.International Maritime Organization (IMO) provides that:Any class2 and more than class2 dynamic positioning vessel have to be failure mode and effect analysis (FMEA). Through FMEA, people can analysis all the possible failures of the dynamic positioning control system which can evaluate the operation of the ship,crew and the safety degree of environment impact,it also may impact on the system and the components.The system and equipments can be improved its reliability, extended the life of equipment, while enhance the level of security of the dynamic positioning vessel.In this paper, an improved method is presented for the FMEA research after carry out the analysis and study of the FMEA theory. This thesis take the Arrow vessel DP2 dynamic positioning control system and the marine salvage vessel DPI dynamic positioning control system developed by the Harbin Engineering University as the research object, analysis all the possible failure modes and effects of the system various components and its modules, list the possible failure modes, determine the level of fault and make proposed measures. The results demonstrate that the FMEA method for DP1 vessel as effective as for the DP2 vessel. On the basis of the conclusions and date produced by FMEA, fault tree analysis is used in the these two dynamic positioning control system which can automatically create a complete fault tree and do the qualitative analysis of the fault tree though its minimum cut set. By the calculation of the probability of the top event of the fault tree and the critical importance of the bottom event, we can diagnose the fault of the equipments and guide the maintenance activities.This thesis introduce the methods of Analytic Hierarchy Process and Fuzzy Comprehensive Evaluation.Comprehensive considerate all kinds of factors, this paper construct these two dynamic positioning control system model of fuzzy comprehesive evaluation and make the evaluation of state running of the dynamic positioning control system of each subsystems by empirical date analysis, in order to prevent failure better.This software integrates several modules such as program of FMEA analysis, fault tree analysis and system operation evaluation procedures, shows analysis results as result forms.