Research On Multi-method Integration Technology For Marine Equipment Design

As one kind of heavy equipment,Marine products are complex in structure,have long design and manufacturing cycle,and also have high degree of customization ability.Chinese maritime enterprises faces many challenges: the autonomy of design property rights,to improve innovation capacity,to improve production efficiency,to transform from shallow sea equipment to deepsea equipment and many other challenges.According to the current process and main problems of marine engineering design and manufacturing enterprises in China,this paper puts forward the improvement methods of design innovation process and the application of the main design innovation Assistant method in marine engineering products.The main contents are as follows:Firstly,analyze the design and manufacturing process of the marine equipment enterprise,draw the flowchart and analyze the key bottleneck,put forward an improved design innovation process,and introduce different design methods for the stage process activities.Secondly,the method of fuzzy Kano was used to obtain the user's requirement characteristic,classify and sort it.Based on the analysis result of Kano model,Using the intuitionistic fuzzy number IFOWG operator decision method to calculate the importance and order of the customer's demand,and combine the QFD analysis and the alpha cut set defuzzification method,the customer demand characteristics are transformed into the customer's requirement of the product design parameters,and the two level QFD decomposition is used to provide the visual and accurate customer demand information for the whole design stage.Next,the FMEA method is combined with the grey relational degree to analyze the possible failure modes and causes,and the index weight of the grey relational grade is improved based on the results of the two level QFD calculation,and the marine equipment enters trial-manufacture after obtained FMEA table.The failure problems after trial-manufacture are improved by causal chain analysis,functional model and the problemsolving theory based on TRIZ.The invalidation reason and the failure effect through FMEA and TRIZ method are combined as the failure database of the product for further design.Finally,The proposed improved design flow and method was verified through the typical marine products: pipe-laying ship and winch rope device.An example of the offshore platform of the lifting system was validated to verify the process and design methods.