Abstract
Due to the complexity of real-world and the subjective nature of human judgments, an uncertain Grey-AHP method is developed to evaluate the life-cycle risk for offshore platform. According to the proposed method, interval numbers are introduced to express the values evaluating loss of risk indicators and the judgments of possibilities comparison of two indicators in a pairwise comparison matrix. In this paper, a life-cycle based risk evaluation criteria system for offshore platform can be built by risk identification in each stage of life-cycle. Then the values evaluating loss of risk indicators and interval comparison matrices are obtained by experts concerned. From the former, interval grey numbers is acquired by grey clustering analysis. Simultaneously, interval weight vectors are calculated from the later. With synthetic evaluation, the grade of risk is determined by the maximal subjection grade and its near degree. In the end, a practical case is provided to illustrate the validity and practicality of the proposed method.
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