Richard Freeman

About

Richard Freeman is a robotics and mechanical systems researcher whose work has made significant contributions to the fields of robotic manipulation, force control, and cooperative robotic systems. His research spans several interconnected areas, including overconstrained mechanisms, multi-robot coordination, fault-tolerant control, and stiffness modeling — with much of his most influential output emerging from a remarkably productive period in the early 2000s. Freeman's most cited work (49 citations) introduced a novel open-loop stiffness control framework for overconstrained robotic linkages, demonstrating how internal preloads in redundantly actuated systems can be harnessed to engineer desired task-space stiffness characteristics. Complementing this, his studies on internal object loading and dynamic task distribution for cooperating manipulators (40 and 37 citations, respectively) provided foundational insights into how multiple robotic arms can intelligently share forces and moments during collaborative manipulation tasks. His contributions to geometric stability in force control (32 citations) addressed longstanding instability challenges that had plagued earlier implementations, while his fault-tolerant robotics research tackled actuator saturation and torque redistribution under failure conditions — practically vital concerns for real-world deployment. With earlier work dating back to 1982 on generalized coordinate selection for complex mechanical systems, Freeman's career reflects a sustained and rigorous engagement with the theoretical underpinnings of robotic and mechanical system dynamics.

Research Focus

Key Achievements

Top Papers

1. 1
   Open-loop stiffness control of overconstrained mechanisms/robotic linkage systems

   49 citations · 2003
2. 2
   Internal object loading for multiple cooperating robot manipulators

   40 citations · 2003
3. 3
   Dynamic task distribution for multiple cooperating robot manipulators

   37 citations · 2003
4. 4
   Geometric stability in force control

   32 citations · 2002
5. 5
   The Generalized Coordinate Selection for the Dynamics of Complex Planar Mechanical Systems

   21 citations · 1982
6. 6
   The dynamic and stiffness modeling of general robotic manipulator systems with antagonistic actuation

   20 citations · 2003
7. 7
   Actuator saturation avoidance for fault-tolerant robots

   19 citations · 2002
8. 8
   Torque redistribution method for fault recovery in redundant serial manipulators

   11 citations · 2002
9. 9
   Open-loop stability of overconstrained parallel robotic systems

   5 citations · 2002
10. 10
    Evaluation of loop constraints for kinematic and dynamic modeling of general closed-chain robotic systems

    4 citations · 1994

Key Collaborators

Contact & Links