Taking foamed bitumen preparation equipment as the research object, aiming at the shortcomings and shortcomings of traditional failure mode and effect analysis (FMEA) method, this paper proposes a method to improve FMEA based on intuitionistic fuzzy. This method converts N expert language variables into corresponding intuitionistic fuzzy numbers to represent the failure mode and risk factor weight evaluation information. Combined with intuitionistic fuzzy weighted geometric operators and improved Hamming distance, the traditional FMEA method is improved to determine the bubble Risk order of failure mode of asphalt preparation plant. The results show that: asphalt pipe blockage, asphalt tank cracking and tapered rod end fracture are the three highest failure modes for foamed asphalt preparation equipment.
The FMEA method is a bottom-up method, and the FTA method is a top-down method. This paper proposes to combine the two methods, using the complementarity of the FMEA method and the FTA method, and targeting the innovative product- The six subsystems of the bubble device perform fault analysis, grasp the key parts of the fault, and propose corresponding solutions based on a comprehensive analysis of the fault. The analysis results show that the failures of the asphalt foaming device mainly occur before and during the asphalt foaming. The FMEA table reflects that the RPN value of the two failure factors of the blockage of the asphalt pipeline and the blockage of the water nozzle is the largest. The three failure factors with the highest severity level (SER) are heater damage, motor damage and PLC control device failure.
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