基于Fuzzy-AHP的机械设备多特征参数健康状态综合评价研究

摘要

This paper is aimed at the system evaluation problem of mechanical equipment caused by factors, such as the multiplicity of structure, close relevancy, and complex operating environment, from the viewpoint of functional hierarchy, a quantitative evaluation method of mechanical equipment multi feature parameters health state was developed on the basis of theory of fuzzy set synthesis evaluation and AHP. Considering the concept of human health and the equipment running parameters (including reliability, maintenance, technical performance, etc. ), the mechanical equipment health state and its evaluation hierarchy model were analyzed. The health value was employed to quantitatively describe the running state degree. The weight vectors of all evaluation hierarchies were discussed by using the AHP method with the experiences of experts. Applied the fuzzy set evaluation theory, a type of subjection function of positive and negative indicators was presented, and the evaluation matrix was discussed as well as fuzzy transformation algorithm operators. The valuation model for mechanical equipment's multi feature parameters health state based on fuzzy - AHP was built. The health value of subsystems can be obtained by means of "from bottom to top", then the database of health values of whole mechanical equipment will be established. Based on the database, the health state of mechanical equipment is clear, which provides theoretical guide for seeking further optimization maintenance strategy. Finally, a health state evaluation of rotary kiln used in cement industry was taken as an example to verify the effectiveness and feasibility of the proposed method.%针对机械设备结构形式多样、关联性强、运行环境复杂等因素导致系统评价困难的问题,从机械设备功能层次结构出发,运用模糊综合评价(fuzzy set)和层次分析法(AHP),提出了一种量化评价机械设备多特征参数健康状态的新方法.结合人的健康概念,综合考虑设备运行过程中各特征参数(如可靠性、维修性、技术性能等),研究了机械设备健康状态及其评价层次结构,提出用健康值来定量描述机械设备运行状态程度;利用AHP方法结合专家的经验判断,分析评价层级结构权重;运用Fuzzy set评价理论,提出一种正负指标的隶属函数构建方法,探讨了系统评价矩阵和模糊变换算子,并建立了基于Fuzzy-AHP的机械设备多特征参数健康状态评价模型,采取"自下而上"方式逐一计算出各系统的健康值,形成系统健康值数据库,以掌握机械设备健康状态.以水泥行业中的核心设备回转窑作为分析实例,验证了该方法的有效性和可行性.