Abstract: Equipment maintenance support system is a complex system and assessing its effectiveness is an important means to check maintenance support capability. On the basis of analyzing the components of equipment maintenance support system, the effectiveness evaluation index system of equipment maintenance support system is established. Considering the uncertainty of evaluation experts’ judgment on the index weight, the interval analytic hierarchy process and the three element connection number are introduced to determine the weight of evaluation indicators. Then the normal cloud model is used to improve the grey triangle whiten weight function, and a normal grey cloud effectiveness evaluation model is proposed, which integrates the advantages of the cloud model and the grey evaluation method in dealing with complex problems of fuzziness, randomness and grey. Finally, the validity of the proposed method is verified by case analysis, set pair analysis and fractal conception.

Key words: normal grey cloud, interval analytic hierarchy process, equipment maintenance support system, effectiveness evaluation