A new reliability allocation method for mechanical systems considering parts recycling and performance stability

Abstract

A reliability allocation method for mechanical system is proposed in this paper, which considers the parts recycling and the performance stability of system. First, taking the meta-action of the mechanical system as the analysis object, and six influencing factors are comprehensively considered, including the maturity of unit technology, environmental severity, parts recycling and reuse, unit structural complexity, unit maintenance coefficient, and performance impact. The maturity of unit technology, environmental severity and parts recycling and reuse as the qualitative evaluation indexes; The complex of unit structure, coefficient of unit maintenance and performance impact as the quantitative evaluation indexes. Then, the qualitative data and quantitative data are comprehensively analyzed by TOPSIS method to obtain the reliability distribution coefficient of each unit, and the reliability of the mechanical system is allocated reasonably. Compared with the traditional method, the reliability allocation process of mechanical system is analyzed from the perspective of the lifecycle cost and the perspective of mechanical system performance stability. The boundary of influence factors is clear and the rationality results is more reasonable. The reliability allocation of NC rotary table system is analyzed by using the proposed method, and the allocation results is compared with the traditional method to verify the effectiveness of this method.