Hull Construction Accuracy Control Of Key Technologies

Application of overall accuracy control technology is the milestone of realization of modem shipbuilding industry. If we start from hull components material nesting and replace margin by compensation amount, this will simplify the process of shipbuilding construction, great amount of man-hours and materials will be saved, thus the shipbuilding speed will be increased significantly. According to investigation, during the hull construction process, only one-sixth of the overall manhours are for assembly, but half of the overall man-hours are used for adjustment while one-third of the overall man-hours are for cleaning-up. So the goal of application of hull construction accuracy control method in the shipyards is to abolish adjustment and reduce cleaning up amount to the maximum level, extensive amount of man-hours, materials and energy will be saved. In conclusion, the study of ship construction accuracy control is of great importance.This paper mainly studied the following key technologies:(1) Key issues to be resolved in application of accuracy control technology of hull curved sections construction. Accuracy control technology of hull curved sections construction process is one of the issues in hull construction, the fundamental solution is how to define the accuracy control compensation amount of the outer shell of hull curved sections and how to correctly establish the model of accuracy compensation amount of outer shell of hull curved sections. This paper points out that there are tow main parts in accuracy compensation of curved hull section, one is processing compensation amount during hot processing of the curved outer shell and the other one is the assembly compensation amount during welding applied on the curved outer shell. Based on the application of the developed area shrinking amount calculation system of the processing of curved outer shell, this paper has pointed out the method of establishment of test samples of processing compensation amount of the curved outer shell through statistic experiments and forwarded method of selection of practical model of processing compensation amount of the curved outer shell; at the same time, it introduced the inspection method of assembly compensation amount of the curved outer shell; and developed relevant data base based on the above. Through calculation and analysis, this paper raised the research method in establishment of practical model of assembly compensation amount of the curved outer shell.(2) The control method of weight and centre of gravity of offshore structures and floaters, which provides assistance in the study of accuracy control technology of weight and centre of gravity of shipbuilding. Weight and centre of gravity control of offshore structures and floaters is one the key aspects in the project management of offshore engineering. Its aim is to control the weight and centre of gravity control of offshore structures and floaters during construction process and the. variable load will satisfy the requirement of the specification and working condition at sea. The client has very demanding requirement in weight and centre of gravity accuracy control of offshore structures and floaters during construction. This requirement will be reiterated in the tendering documents, construction contract and specification. This paper mainly studied the key technology of weight and centre of gravity accuracy control of offshore structures and floaters, developed structural design of weight and centre of gravity data base and realized its main function by using VB and ACESS. And the tolerance distribution calculation formula of weight and centre of gravity of offshore structures and floaters was worked out by utilizing dimension chain principle. The dynamic adjustment and control method of weight and centre of gravity tolerance during construction was raised. Some of the results of this paper has been applied in the shipyard.