MULTI-CRITERIA SELECTION OF OPERATING MODES OF MAIN PIPELINE UNITS DURING OIL TRANSPORTATION WITH FUZZY INFORMATION

Abstract

The relevance of the research is justified by the fact that when managing oil transportation through trunk pipelines, it becomes necessary to determine and select the optimal operating modes of the pipeline units, taking into account the vagueness of some part of the initial information. In this regard, the formulation and solution of the problems of multi-criteria selection of effective operating modes of technological objects of the oil pipeline system, which are often described in a fuzzy information environment based on the mathematical apparatus of fuzzy sets, is an urgent scientific and practical task. The main aim of the research is to formulate the problem statements of the multi-criteria selection of operating modes of technological objects with fuzzy initial information based on the adaptation of various principles of optimality and develop heuristic methods for their solution, which are based on attracting a decision maker in solving the problem. Implement the proposed fuzzy approach to solving the problem of selecting the optimal operating mode for the oil heating station of the Uzen–Samara trunk oil pipeline in Atyrau. Objects: technological units of the main oil pipeline, which are characterized by multi-criteria and unclear certain restrictions. Methods: methods of theories of fuzzy sets, methods of multicriteria choice, heuristic methods, methods of fuzzy mathematical programming. Results. The authors have stated the problems of multi-criteria selection of operating modes of technological units of main oil pipelines in the conditions of fuzziness of some part of the initial information and developed the heuristic methods for their solution. The proposed heuristic methods of multi-criteria selection in a fuzzy environment are developed based on the application of experience and knowledge of the decision maker and modification of various optimality principles for working in a fuzzy environment. To ensure that the decision maker can choose a more convenient method of solving the choice problem depending on the availability and accessibility of the source information, the current situation, a set of statement of the choice problem is proposed by applying various principles of optimality (compromise decision-making schemes) and their combination. The proposed approach was implemented in formulating and solving the problem of multi-criteria selection of operating modes of the pipeline with the aim of optimally controlling the process of pumping oil through the Uzen–Atyrau–Samara trunk pipeline (Kulsary–Atyrau section) with the involvement of a person, i. e. applying fuzzy information in the form of his/her experience, knowledge and intuition. The obtained results confirmed the effectiveness of the proposed approach to solving the tasks.