Sliding mode observer-based fault detection for helicopter system

ABSTRACT

Fault detection of non-linear systems is of great importance in control systems reliability. Undetected faults could lead to irreparable damage. This paper deals with fault diagnosis of helicopter system in the presence of uncertainties and disturbances. To deal with sensor, actuator and component faults, the observer-based diagnosis scheme which employs sliding mode observer is designed. Faults are modelled as an additive and multiplicative fault which is introduced as an abrupt and intermittent fault into the system. Observer inequality constraints and gain matrices are solved using a Lyapunov-based approach. The results display the effectiveness of the designed observer and the ability to handle faults.

KEYWORDS:

• Fault diagnosis
• sliding mode observer
• sensor
• actuator and component faults
• residual generation

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability statement

The authors confirm that the data supporting the findings of this study are available within the article.

Additional information

Notes on contributors

M. Raghappriya

M. Raghappriya received her Bachelor's degree in Electronics and Instrumentation Engineering and M.E. degree in Control Systems from Anna University, Chennai. She is currently working as an Assistant Professor with the Department of Electronics and Instrumentation Engineering, Government College of Technology, Coimbatore. She has more than nine years of teaching experience. Her research areas include fault detection and diagnosis, control systems, process control and state estimation.

S. Kanthalakshmi

Dr. S. Kanthalakshmi received her Bachelor's degree in Electrical and Electronics Engineering and her Master's degree in Applied Electronics from Bharathiar University, Coimbatore and the Ph.D. degree in the Faculty of Electrical Engineering from Anna University, Chennai. She is currently working as a Professor with the Department of Electrical and Electronics Engineering, PSG College of Technology, Coimbatore. She has more than 20 years of academic experience and one year of industrial experience. Her research interests include control and drives, fault-tolerant control and embedded control.