Analytical method for Fault Detection & Isolation in Electro-Hydrostatic Actuator using Bond graph modeling

This paper dealt with an analytical approach for fault detection with robust isolation in modern power-by-wire Electro-hydrostatic actuator. The complex and multi domain nature of EHA always requires consistent health monitoring for Failure-safe operation. The mathematical model of EHA using a bond graph methodology is presented in this paper to directly derive the structural analytical redundancy relation (ARR) for fault detection and robust threshold in the presence of measurement uncertainties for fault isolation. Simulations show the successful detection & isolation of internal leakage fault in EHA using the proposed methodology.