Quantitative analysis method for ship construction quality

FU Senzong1，WANG Hongdong2，3，YI Hong2，3 1 Shanghai Military Representative Department，Naval Armament Department of PLAN，Shanghai 201206，China 2 State Key Laboratory of Ocean Engineering，Shanghai Jiao Tong University，Shanghai 200240，China 3 Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration，Shanghai 200240，China

Abstract：The excellent performance of a ship is assured by the accurate evaluation of its construction quality. For a long time, research into the construction quality of ships has mainly focused on qualitative analysis due to a shortage of process data, which results from limited samples, varied process types and non-standardized processes. Aiming at predicting and controlling the influence of the construction process on the construction quality of ships, this article proposes a reliability quantitative analysis flow path for the ship construction process and fuzzy calculation method. Based on the process-quality factor model proposed by the Function-Oriented Quality Control (FOQC) method, we combine fuzzy mathematics with the expert grading method to deduce formulations calculating the fuzzy process reliability of the ordinal connection model, series connection model and mixed connection model. The quantitative analysis method is applied in analyzing the process reliability of a ship's shaft gear box installation, which proves the applicability and effectiveness of the method. The analysis results can be a useful reference for setting key quality inspection points and optimizing key processes. Key words：ship reliability；ship quality assessment；quantitative evaluation；process reliability；fuzzy cal⁃ culation