Fuzzy matter-element model for selection of ocean trawler special refitting sites

Selection of ocean trawler refitting sites problem in wartime, is affected by a variety of technical factors and other factors such as organization, planning, management, etc. A fuzzy matter-element model is built up in view of the fuzziness and incompatibility of the indexes, combining quantitative analysis with qualitative analysis, with quantifying the qualitative indexes by linguistic variables and fuzzy numbers, and with quantitative analysis on the former. The grey relational analysis theory is used to calculate the value of index weights, to reduce the subjective randomness. The multi-objective selection problem is transformed into the single-object decision by Euclid approach degree. The example shows that the method is very practical and the result is objective.