title: Robust stability of teleoperation systems with time delay: a new approach.
abstract: In this paper, we propose an approach to the control of linear teleoperation systems under time delays. Unlike traditional delay-robust control systems that guarantee passive communication channel through the transmission of wave variables, the new approach uses the concept of absolute stability for the physically expressive Lawrence's four-channel structure for transmitting the standard power variables, i.e., force and position. By incorporating kinesthetic performance requirements, we derive an absolutely stable four-channel controller that is transparent when time delay is negligible. Experimentally, the study evaluates and compares the performance of the proposed controller with that of a benchmark wave variable-based controller. The results indicate contact stability for large delays, a lack of position drift, and improved position and force tracking in both the free motion and rigid contact regimes for small delays.
authors.forename: A
authors.initials: A
authors.lastname: Haddadi
authors.forename: K
authors.initials: K
authors.lastname: Hashtrudi-Zaad
mesh_terms: D006801:Humans; D008962:Models, Theoretical; D012371:Robotics / Q000295:instrumentation / Q000379:methods / Q000592:standards; D013997:Time Factors; D014110:Touch; D014584:User-Computer Interface