Real time adaptive nonlinear model inversion control of a twin rotor MIMO system using neural networks

Authors:
A. Rahideh;A. H. Bajodah;M. H. Shaheed
Affiliations:
School of Electrical and Electronic Engineering, Shiraz University of Technology, Shiraz, Iran and School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK;King Abdulaziz University, Jeddah, Saudi Arabia;School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
Venue:
Engineering Applications of Artificial Intelligence
Year:
2012

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Abstract

This paper investigates the development and experimental implementation of an adaptive dynamic nonlinear model inversion control law for a Twin Rotor MIMO System (TRMS) using artificial neural networks. The TRMS is a highly nonlinear aerodynamic test rig with complex cross-coupled dynamics and therefore represents the control challenges of modern air vehicles. A highly nonlinear 1DOF mathematical model of the TRMS is considered in this study and a nonlinear inverse model is developed for the pitch channel of the system. An adaptive neural network element is integrated thereafter with the feedback control system to compensate for model inversion errors. The proposed on-line learning algorithm updates the weights and biases of the neural network using the error between the set-point and the real output. The real-time response of the method shows a satisfactory tracking performance in the presence of inversion errors caused by model uncertainty. The approach is therefore deemed to be suitable to apply real-time to other nonlinear systems with necessary modifications.