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MS Thesis

Robust Control Algorithms for Twin Rotor System

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This thesis deals with robust control strategies from linear and nonlinear techniques for helicopter system. This system is prone to highly disturbing interstate cross-couplings and perturbations in center of gravity that affects smooth flights. The presented controllers offer solutions for smooth tracking in presence of strong cross-couplings and disturbing torques caused by perturbation in center of gravity. The H controller employed from linear robust control theory involves traditional and Hadamard weights in controller synthesis process. However the designed controller works for linear range only and robustness is achieved at the cost of performance or vice versa. The second attempt involves the sliding mode controllers from nonlinear theory. This technique delivers solution against cross-couplings and disturbing torques caused by variation in center of gravity is solved by using 2-sliding mode controller. These nonlinear controllers control the system in nonlinear range. Meanwhile an attempt to design sliding surface from Linear Matrix inequalities algorithms delivers the solution which is not suitable for practical implementation. The designed controllers are validated by implementing on helicopter model, after successful numerical simulations.   

 

Gadget Videos

H-Infinity based Robust control of 2-DOF Helicopter

MS thesis Implementation Results

Stewart Platform Dynamical Analysis

Pro-Engineer based simulation for Stewart platform Dynamical Analysis (Presented at IFAC, WC 2008)

My Publications

Robust Decoupling Control Design for Twin Rotor System using Hadamard Weights

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Presentation @ Conference of Control Applications, MSC 2009, St. Petersburg, Russia

Nonlinear Robust Decoupling Control Design for Twin Rotor System

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Presentation @ Asian Control Conference (ASCC'09), Hong Kong

LMI Based Sliding Mode Control Design for Twin Rotor System

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Presentation @ SIAM Conference on Control and Its Applications 2009, Colorado, USA.

Determination of Realistic Uncertainty Bounds for the Stewart Platform with Payload Dynamics

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Presentation @ International Fedration of Automatic Control, World Congress 2008, Seoul, Korea.

Dynamic Analysis and Robust Control Design for Stewart Platform with Moving Payloads

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Presentation @ Conference of Control Applications, MSC 2008, Texas, USA

Exploring LEGO Robotics to Deliver Insights into Control Systems

Obstacle avoiding robot

Presentation @ Robotics Educators Conference 2008Carnegie Mellon University Robotics Academy