An Improved FMEA Method Based on Performance Degradation Analysis for Offshore Wind Turbine Blade Trailing Edge

Abstract

There are lots of performance degradation failure modes in offshore wind turbine blade trailing edge, such as stiffness degradation, strength reduction, et al. The occurrence and severity of such failure modes can't be easily determined, and the traditional failure mode and effect analysis (FMEA) method is difficult to be applied. Considering the fact, an improved FMEA method based on performance degradation analysis is proposed for wind turbine blade trailing edge, in which the RPNs are calculated by new methods. Specifically, a performance parameter degradation model is established based on random processes, then the occurrence of each failure mode of that is assessed; The Pearson correlation coefficient of each failure mode and each performance parameter is calculated, then the calculation method of severity is given; Here the detection method of each performance degradation failure mode is assumed to be mature, thus the detections are considered equal. This research can provide reliability analysis methods for complex systems with performance degradation failure modes.