Ian Postlethwaite

About

Ian Postlethwaite is a distinguished control systems engineer whose research has significantly advanced the fields of robust control, nonlinear control, and robotics. His work spans several interconnected areas, including adaptive neural network control, H∞ optimization, and dynamic modelling of robot manipulators, making him a versatile and impactful contributor to modern control theory. Among his most notable contributions are his investigations into nonlinear adaptive control of robot manipulators, including the challenging problem of incorporating motor dynamics into control design. His 1993 work on this topic demonstrated how complex dynamic models could be transformed into tractable forms amenable to cutting-edge control methods — a methodological advance that has informed subsequent research. His development of simple robust control schemes requiring only joint position measurements addressed a critical practical limitation, eliminating the need for velocity sensors in point-to-point motion control. Postlethwaite also pioneered applications of nonlinear H∞ control to industrial manipulators, including the Tetrabot system, bridging theoretical optimization and real-world robotics. His loop-shaping approach to robust performance further demonstrates his breadth across classical and modern control paradigms. With papers accumulating citations across nearly two decades, his research continues to serve as a valuable foundation for students and practitioners working at the intersection of control theory and robotic systems.

Research Focus

Key Achievements

Top Papers

1. 1
   Adaptive Neural Network Controller Design for Flexible Joint Robots using Singular Perturbation Technique

   30 citations · 1995
2. 2
   Nonlinear Adaptive Control of Robots Including Motor Dynamics

   29 citations · 1993
3. 3
   A Simple Robust Control Scheme for Robot Manipulators With Only Joint Position Measurements

   28 citations · 1993
4. 4
   Robust Nonlinear H ∞ /Adaptive Control of Robot Manipulator Motion

   17 citations · 1993
5. 5
   Application of non-linear H∞ control to the Tetrabot robot manipulator

   12 citations · 1998
6. 6
   Robust Non-Linear <i>H</i> _∞ /Adaptive Control of Robot Manipulator Motion

   11 citations · 1994
7. 7
   A loop-shaping approach to robust performance for SISO systems

   11 citations · 1991
8. 8
   Non-Linear Adaptive Control of Robots Including Motor Dynamics

   7 citations · 1994
9. 9
   A Simple Robust Control Scheme for Robot Manipulators with Only Joint Positon Measurements

   3 citations · 2005
10. 10
    Collective Aggregation Pattern Dynamics Control via Attractive/Repulsive Function

    2 citations · 2009

Key Collaborators

Contact & Links