Health assessment and life prediction model of hydraulic support

In order to solve the urgent need of health assessment and life prediction of hydraulic support in fully-mechanized mining face, a hierarchical fuzzy comprehensive evaluation method for hydraulic support is proposed. The method uses the improved fuzzy analytic hierarchy process based on the three-scale method to calculate the weight vector of the health state parameters. The concept of coefficient of variation and trapezoidal fuzzy number is introduced to de-differentiate the evaluation results, which improves the consistency and effectiveness of the comprehensive evaluation results. The hydraulic support health index and comprehensive health level can be obtained on the basis of comprehensive evaluation. At the same time, based on this, a life prediction model of hydraulic support based on health index was established, and the comprehensive health management of hydraulic support was realized.Taking the hydraulic support used in No.152313 working face of Gushuyuan Mine of Jincheng Coal Group as an example, the health status assessment and life prediction are analyzed.The results show that health assessment and failure time prediction of hydraulic support is 13.45 month by the method,this is bascically consisitent with the expected ovevhaul time of 13 months,and verifies the rationality and effectiveness of the above model.