Authors
Abstract
Aerospace Launch Vehicles (ALV) are generally designed with high reliability to operate in complete security through fault avoidance practices. However, in spite of fault avoidance, fault occurring is inevitable. Hence there is a requirement for on-board fault detection and isolation (FDI) without significant degradation in the ALV performance. The robust observers are widely used in FDI due to reduction of the effect of disturbances in the FDI process. In this paper, the robust fault diagnosis observer is designed for an ALV subject to uncertainties. The linear sliding mode technique is used to design the observer for a linear time varying model of an ALV. The parameter estimation from the sliding mode scheme is compared with those generated by a nonlinear simulation and are found to provide good correlation. Then, a proposed linear sliding mode observer is employed to generate the residual as an indicator of predefined gyroscope faults.
Keywords
- Chen, J., and Patton, R. J., “Robust Model-Based Fault Diagnosis for Dynamic Systems,” Dordrecht: Kluwer Academic Publishers, 1999.
- Jia, G., Adaptive Observer and Sliding Mode Observer Based Actuator Fault Diagnoise for Civil Aircraft, (Thesis M. Sc.), Simon Frazer University, 2006.
- Charles, E., Shtessel, H. and Shtessel, B., “Sliding Mode Disturbances Observer-Based Control for Reuseable Launch Vehicle,” AIAA Guidance, Navigation, and Control Conference, San Francisco, California, 2005.
- Falcoz, A., Henry, D. and Zolghadri, A., “Robust Fault Diagnosis for Atmospheric Reentry Vehicle: Case Study,” IEEE Transaction on System, Vol. 40, No. 5, September 2010, pp. 886 - 899.
- Roshanian, J., Saleh, A. R. and Jahed-Motlagh, M. R, “On the Design of Adaptive Autopilots for a Launch Vehicle,” Procceding IMechE, Journal Systems and Control Engineering, Vol. 221, 1, Part I, 2007, pp.27-38.
- Edwards, C. and Spurgeon, S. K., “On the Development of Discontinuous Observers,” International Journal of Control, Vol. 59, No.5 1994, pp.1211-1229
- Spurgeon, S. K., “Sliding Mode Observers: a Survey,” International Journal of Systems Science, Vol. 39, No. 8, 2008, pp. 751-764.
- Edwards, C., Spurgeon, S. K. and Patton, J. “Sliding Mode Observers for Fault Detection and Isolation,” Automatica, Vol. 36, No. 36, 2000, pp. 541–553.
- Sobhani, E., “Fault Diagnosis of Nonlinear Systems Using Hybrid Approach,” Lecture Note in Control and Information Science, Springer, 2009.
- Jia, G., On Adaptive Observer and Sliding Mode Observer Based Actuator Fault Diagnosis for Civil Aircraft, (M. Sc. Thesis), 2006, p. 9.
)