Jim Chapel

Martin Marietta Materials (United States)

Papers

Total Citations

H-Index

About

Jim Chapel’s research career has centered on the frontiers of robotic manipulation, with a particular focus on ensuring safe, stable physical interaction between robots and their environments. His most cited work, "Coupled stability characteristics of nearly passive robots" (2003, 11 citations), makes a foundational contribution to control theory by addressing a critical challenge: how to design manipulator control laws that guarantee stability during contact tasks. Chapel introduces a novel metric that quantifies the "distance" between a robot’s achieved, potentially nonpassive response and an ideal passive target, providing engineers with a practical design tool for creating nearly passive systems that are both robust and high-performing. Earlier, in "Issues, concerns, and initial implementation results for space based telerobotic control" (1987, 2 citations), he tackled the unique difficulties of controlling robots in orbit, arguing that traditional force-reflection teleoperation is ill-suited for space assembly and servicing. By highlighting the need for computer-based compliance control—a concept still central to modern space robotics—Chapel helped lay the groundwork for autonomous and teleoperated systems used on the International Space Station and beyond. Though his citation counts reflect a niche but deeply influential audience, his work remains a touchstone for researchers in passive and interactive robot control.