基于集对联系数和可变模糊集的起重机金属结构安全评价

针对起重机金属结构安全评价时确定相对隶属度的不足和最大隶属度原则不适用的问题,提出了以组合赋权法和可变模糊集理论相结合的评价方法。该方法将评价指标的评分结果转化为评价向量,依据可变模糊集理论中的相对差异度函数确定相邻两级指标的相对差异度;利用层次分析法和信息熵法分别确定起重机金属结构的主观和客观权重,运用集对联系数融合主客观权重;由组合权重和相对差异度矩阵确定综合相对隶属度,并通过变换组合参数进行综合评价,同时经计算得到评价对象的安全等级;最后,以某造船门式起重机金属结构变形缺陷的评价为例,验证了该模型的合理性和可行性。

Safety Assessment of Crane Metal Structure Based on Set Couplet Coefficient and Variable Fuzzy Sets

In view of the insufficiency of determining relative membership degree and the inapplicability of the principle of maximum membership degree in safety evaluation of crane metal structure, an evaluation method based on combination weighting method and variable fuzzy set theory is proposed. The method transforms the evaluation result of evaluation index into evaluation vector, and determines the relative difference degree of two adjacent indexes according to the relative difference function of variable fuzzy set theory. The subjective and objective weights of crane metal structure are determined by analytic hierarchy process and information entropy method, and the subjective and objective weights are fused by set couplet coefficient. The comprehensive relative membership degree is determined by the combination weight and relative difference matrix, and the comprehensive evaluation is carried out by transforming the combination parameters. At the same time, the safety grade of the evaluation object is calculated. Finally, the rationality and feasibility of the model are verified by an example of evaluating the deformation defects of metal structure of a shipbuilding gantry crane.