Authors

Abstract

Aiming at the traditional FMECA (Failure Modes, Effect and Criticality Analysis) results of the threshing and cleaning system, which are strongly influenced by subjective factors, imprecise and easy to repeat, the fuzzy comprehensive evaluation method is introduced to quantify the results of the expert evaluation and reduce the subjective influence. Analytic Hierarchy Process (AHP) is used to assign weights to each influencing factor, and by calculating the comprehensive hazard level index, the hazard ranking of each failure mode is carried out, from which the critical failure modes are identified as the focus of improvement, so as to improve the reliability of the system. Comparison shows that the improved method effectively makes up for the shortcomings of the traditional FMECA analysis method, and it is easier to find out the critical failure modes, which provides a theoretical basis for practical application.

Abstract in Chinese

针对脱粒清选系统传统FMECA分析结果受主观因素影响强烈、取值不精确且易重复等问题，引入模糊综合评判方法，量化专家评价的结果，降低主观影响；采用层次分析法（AHP）对各个影响因素进行权重分配，使各个影响因素间的相对重要性得以彰显，提高了分析结果的科学性与合理性；通过计算综合危害度等级指数，对各个故障模式进行危害度排序，从中找出关键故障模式作为改进的重点，以此来提高系统的可靠性。