基于熵权法和模糊集的船舶操纵性综合评价研究

Synthesized Evaluation of Ship Maneuverability Based on the Entropy-Weight Method and Vague Value Method

采用熵权法—模糊集对船舶操纵性进行综合评价,建立船舶操纵性综合评价指标体系,阐述该方法的构造原理和操作步骤,并采用两种传统评价方法验证熵权法—模糊集在船舶操纵性综合评价中的有效性。以舵间距可调的双舵船自航模为研究对象,分别求取自航模在不同舵间距时操纵性评价指标的综合权重、模糊值以及评分函数,通过将综合评价结果与船模K′T′P′指数进行对比分析,可得到更优的排序结果。该方法中,综合权重的确定克服了主观或客观单一方面赋权的不足,操纵性综合评价实现了由单一片面评价向全面综合评价的转变。熵权法—模糊集不仅在理论上具有优越性,在实际应用中也是可靠的,更适用于对船舶操纵性开展综合评价。

The ship maneuverability is synthetically evaluated in this paper with the entropy weight meth od combined with vague value method.Particularly,an integrated evaluation index system for ship maneu verability is established,the basic principle and procedure of this system is illustrated,and the proposed method is successfully validated by a comparison with two conventional evaluation approaches.The method mainly targets at two-rudder and self-propelled ship models whose rudder spacing is adjustable,and the synthetic weight,vague value and scoring function are calculated with different rudder spacing,respective ly.The research shows that this method provides better sorted results than K ′,T ′ and P′ do,and the subjective or objective weight is coupled to the synthetic weight so that the shortcomings of single weight in put can be overcome.Generally,as the ship maneuverability evaluation is shifting from unilateral evalua tion to synthesized evaluation,the proposed method is not only theoretically valid but also practically supe rior than conventional evaluation approaches.