Relook at Aileron to Rudder Interconnect

Keywords: Aircraft, Control law, Flight, Aileron to rudder interconnect gain, ARI, Reconfiguration


The implementation of interconnect gain from aileron to rudder surface on the majority of the aircraftis to decrease sideslip which is generated because of adverse yaw with the movement of control stick in lateral axis and also enhances the turning rate performance.The Aileron to Rudder Interconnect (ARI)involves significant part to decouple the Dutch roll oscillations from roll rate response to aileron command. ARI is feed-forward gain whichis susceptible to aircraft system uncertainty. Incorrect ARI gain can lead to side slip buildup which can cause aircraft to depart in case of fault scenarios. Four systematic ARI design methods are proposed. One of the proposed methods which use the norm of ARI transfer function at roll damping frequency is suitable for online reconfiguration of control law. The reconfiguration of ARI gain is illustratedwith the simulation responses of fault scenario case of aileron surface damage.

Author Biographies

M. Jayalakshmi, Integrated Flight Control Systems, Aeronautical Development Agency, Bengaluru - 560 017

Ms M. Jayalakshmi completed BTech Electrical and Electronics from Nagarjuna university, in 2001, ME Control Systems from PSG College of Technology, Coimbatore in 2003. Currently pursuing PhD in Engineering stream at Academy of scientific and innovative research (AcSIR), CSIR-NAL, Bangalore. She has published around 7 papers in the International Conferences. Currently working as scientist in Integrated Flight Control System (IFCS) directorate of Aeronautical Development Agency (ADA), Bangalore from 2004.

Vijay V. Patel, Integrated Flight Control Systems, Aeronautical Development Agency, Bengaluru - 560 017

Dr Vijay V. Patel received his BE from the Govt college of engineering, Pune university, and received his MTech and PhD from IIT Kharagpur in 1992 and 1995, respectively. he is currently Group Director (Flight Control Laws- LCA Airforce) and is member (since 1995) of the National Control Law Team setup for the flight control design, development and testing of Light Combat Aircraft (LCA) later named as Tejas. he has published around 70 technical papers in peer reviewed international journals and conferences. He is recipient of INSA (Indian National Science Academy) “Young Scientist Award (2001)”, INAE (Indian National Academy of engineering) “Young Engineer Award (2004)”, DRDO Scientist of the year (2013) Award” and other awards from ISCA, NAL, DRDO.

Giresk K. Singh, CSIR-National Aerospace Laboratories, Bengaluru - 560 017

Dr Giresh K. Singh received his the PhD in Electrical Engineering from IIT Kanpur in 1999 on application of Sliding Mode Controller Designs to flight control. he has been working as a Scientist in the Flight Mechanics & Control Division at National Aerospace Laboratories, Bangalore, India since 1998. his main research interests are flight dynamics, control and optimisation. He has published around 25 technical papers in peer-reviewed international journals and conferences.

How to Cite
Jayalakshmi, M., Patel, V. V., & Singh, G. (2021). Relook at Aileron to Rudder Interconnect. Defence Science Journal, 71(2), 153-161.
Aeronautical Systems