Application of adaptive square root cubature Kalman filter in turbofan engine gas path performance monitoring

[摘要] Kalman filters are very popular in turbofan engine community for health monitoring purposes. In this study, in order to get better performance in terms of filtering accuracy and noise adaptability, an Adaptive Square Root Cubature Kalman Filter (ASRCKF) was proposed to estimate health parameters of the turbofan engine gas path components. In the ASRCKF algorithm, the mean value and covariance of the engine nonlinear function were calculated by cubature rule-based numerical integration method and used as a substitute for nonlinear model in nonlinear Kalman filter. The latest information of measurement parameters in the recursion and filtering process was used to estimate and self-adjust the noises cross-covariance by removable window method to get higher filtering accuracy. Compared with the Extended Kalman Filter (EKF) and Square Root Cubature Kalman Filter (SRCKF), the simulation results in the gradual and rapid deterioration process of turbofan engine gas path components indicate that the higher accuracy and faster convergence can be obtained through ASRUKF, which can be used in health parameters estimation and condition monitoring of turbofan engine gas path.1

[发布机构] Xi'An High-Tech Institute, Shaanxi; 710025, China^1

[效力级别] 生态环境科学 [学科分类] 环境科学（综合）

[关键词] Deterioration process;Filtering accuracies;Gas path components;Measurement parameters;Nonlinear Kalman filter;Numerical integration methods;Performance monitoring;Square-root cubature kalman filters