Research On The Optimization Of Cabin Layout Of Offshore Support Platform Based On Accessibility Evaluation

Under the situation of rapid development of offshore oil and gas exploitation technology and continuous deepening of exploration scope,as a living and dwelling place for personnel working on the auxiliary drilling platform,the deepwater semi-submersible support platform,a type of offshore building,has been proposed and developed rapidly.In recent years,marine safety accidents have occurred frequently,the safety level and flow efficiency of personnel on the offshore platform have become the focus of designers.At present,there are few studies on the optimization of cabin layout of support platform considering accessibility factors,and there is a lack of systematic accessibility evaluation and layout optimization method.Starting from the optimization of cabin layout of deepwater semi-submersible support platform,this paper constructs an optimization method of cabin layout based on accessibility from the aspects of accessibility evaluation,personnel flow simulation and multi-objective optimization.Based on the analysis and summary of the functional requirements,design requirements and structural characteristics of the deepwater semi-submersible support platform,the definition of the accessibility of the support platform is put forward.The research object and the influencing factors of the accessibility are discussed,and it also designs the accessibility evaluation index system applicable to the support platform from the three levels of evaluation condition,function group and performance index,and constructs the accessibility evaluation method.For the process of personnel dynamic flow,based on the idea of dynamic network flow,the general arrangement drawing is abstracted into a dynamic network flow model.Through the introduction of network flow parameters,shortest path algorithm and the relation function of personnel speed and density,the personnel flow simulation algorithm based on discrete dynamic network flow is established,the personnel flow state parameters are output,and the feasibility and validity of the personnel flow simulation algorithm are verified by simulating the flow of double deck personnel.According to the state parameters of personnel flow and the function of cabin proximity,an optimization model of two-objective cabin layout is constructed.The general layout framework based on the channel and bulkhead is extracted,the characteristics of the general layout of the support platform are analyzed in depth,the chromosome coding,decoding and verification methods are designed based on the NSGA-? algorithm,and the improved genetic operations such as selection,crossover and inversion are also designed,and finally the optimized method of cabin layout based on accessibility is established.Taking a deepwater semi-submersible support platform as an example,the optimal layout scheme based on accessibility is solved.The accessibility scores of two schemes finally are obtained then compare and analyze them after modeling simulation and data-statistic for the original layout scheme and optimized layout scheme through the Maritime EXODUS software by calculating the performance index scores,functional group scores and evaluation condition scores with the reference of accessibility evaluation methods.The results confirm that the optimized method of cabin layout based on accessibility is effective and feasible.