An approach for fusion decision and its application to diagnose down-hole conditions of beam pump unit

Multi-source decision is considered to be useful to make completed results. In this paper, D-S evidence theory is used to do multi-source decision fusion, and the conflict between evidences is thought to be caused by the uncertainty of mass function. In many traditional researches, evidence´s own characteristics are seldom considered when fusing different mass functions. To solve this problem, the certain mass function is transformed into interval value using interval-valued intuitionistic fuzzy set theory. The weights of all evidences are determined by the calculation of grey relation degree between evidences. Then the mass function is modified and fused according to the D-S rule. An example for diagnosis of down-hole conditions of beam pump unit shows that the proposed method can receive satisfactory results.