Research And Application Of Weight And Barycenter Measuring System For Large-Scale Offshore Platforms

Weight distribution and Barycenter are critical parameters for installation of offshore platform. Accurate Weight and Barycenter have great influence on selection of slings and crane barge. Influenced by welding materials, partial modification and the like, there are often big difference between Design Weight and Actual Weight, and the offshore platforms are often with the characteristics of large flexibility, unsymmetrical weight distribution, large span between supports and the like. So, study on Weighting System for offshore platforms has important engineering background and practical significance.Main task of the study is modification to the old Platform Lifting System, and the key point is to improve controlling accuracy and security. Based on analysis of the old Lifting Wystem, against the deficiencies and defects, lift the offshore platforms by using hydraulic system, achieve multipoint synchronization coordinated control by using displacement sensor during weighting, achieve accurate weighting by using pressure sensor for large-scale platforms.A general design scheme for Platform Lifting and Barycenter Measuring System is made in this thesis on a basis of investigation and study, analysis of relevant materials; a design on hydraulic system used for platform lifting control is made which mainly for obtaining synchronization of Multi-cylinder and ensuring no cylinder over-pressure during lifting; a Maths Model is established which used for the Weighting System for computing weight and barycetner; a research on balance arithmetic is made, based on this arithmetic, the relevant computer monitoring procedure is wrote; the design for software and hardware for data collection system and computer monitoring system is made, and achieved; site debugging and probation of the Weighting and Barycenter Measuring System is carried out.