7GADDOUNA B O. Fault diagnosis in a hydraulic process using unknown input observers[C]//Proceedings of the IEEE International Conference on Control Applications,Hartford, CT, 1997(1): 490-495.
8LINARIC D, KOROMAN V. Fault diagnosis of a hydraulic actuator using neural network[C]//IEEE International Conference on Industrial Technology, Maribor,Slovenia, 2003(1): 108-111.
9AN L, SEPEHRI N. Hydraulic actuator circuit fault detection using extended kalman filter[C]//Proceedings of the American Control Conference, Denver, Colorado,2003(5): 4 261-4 266.