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Model-following Neuro-adaptive approach for robust control of high performance aircrafts

Padhi, Radhakant and Narayana Rao, P and Goyal, Siddharth and Tripathi, Abha (2007) Model-following Neuro-adaptive approach for robust control of high performance aircrafts. In: International Conference on Advances in Control and Optimization of Dynamical Systems, Bangalore, India, Bangalore.

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Based on dynamic inversion, a relatively straightforward approach is presented in this paper for nonlinear flight control design of high performance aircrafts, which does not require the normal and lateral acceleration commands to be first transferred to body rates before computing the required control inputs. This leads to substantial improvement of the tracking response. Promising results are obtained from six degree-offreedom simulation studies of F-16 aircraft, which are found to be superior as compared to an existing approach (which is also based on dynamic inversion). The new approach has two potential benefits, namely reduced oscillatory response (including elimination of non-minimum phase behavior) and reduced control magnitude. Next, a model-following neuron-adaptive design is augmented the nominal design in order to assure robust performance in the presence of parameter inaccuracies in the model. Note that in the approach the model update takes place adaptively online and hence it is philosophically similar to indirect adaptive control. However, unlike a typical indirect adaptive control approach, there is no need to update the individual parameters explicitly. Instead the inaccuracy in the system output dynamics is captured directly and then used in modifying the control. This leads to faster adaptation, which helps in stabilizing the unstable plant quicker. The robustness study from a large number of simulations shows that the adaptive design has good amount of robustness with respect to the expected parameter inaccuracies in the model.

Item Type: Conference Paper
Keywords: Dynamic inversion;neuro-adaptive design;aircraft control; longitudinal maneuver;lateral maneuver;pilot command tracking;autopilot design
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 22 Oct 2011 07:27
Last Modified: 22 Oct 2011 07:27
URI: http://eprints.iisc.ac.in/id/eprint/41588

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