Publication Details

Publication Nr. 15
15Marco Muenchhof and Rolf Isermann: Fault Detection and Diagnosis of a Linear Hydraulic Servo Axis. Proceedings of the 16th IFAC Symposium on Automatic Control in Aerospace (ACA), International Federation of Automatic Control, 2004. Language: Englisch
Process model based methods to detect faults in a hydraulic linear servo axis by measurement of up to five variables are presented. The faults that are detected include gas enclosures in the hydraulic fluid, such as air, vapour and foam. The control edges and the valve spool are also monitored in order to detect faults such as erosion of the control edges and grooving of the valve spool. Furthermore, the leakage flow between the cylinder chambers and to the surroundings are monitored, which allows to detect damages of the sealing between the cylinder chambers and between the cylinder and the pushrod. The external mechanical load and the valve spool dynamics are also included in the fault detection and diagnosis approach.
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