All Outputs (9)

A robotic test rig for performance assessment of prosthetic joints (2022)
Journal Article
Etoundi, A. C., Dobner, A., Agrawal, S., Semasinghe, C. L., Georgilas, I., & Jafari, A. (2022). A robotic test rig for performance assessment of prosthetic joints. Frontiers in Robotics and AI, 8, Article 613579. https://doi.org/10.3389/frobt.2021.613579

Movement within the human body is made possible by joints connecting two or more elements of the musculoskeletal system. Losing one or more of these connections can seriously limit mobility, which in turn can lead to depression and other mental issue... Read More about A robotic test rig for performance assessment of prosthetic joints.

Virtual inertia as an energy dissipation element for haptic interfaces (2022)
Journal Article
Choi, H., Kim, N. G., Jafari, A., Singh, H., & Ryu, J. H. (2022). Virtual inertia as an energy dissipation element for haptic interfaces. IEEE Robotics and Automation Letters, 7(2), 2708-2715. https://doi.org/10.1109/LRA.2022.3144492

Adding virtual damping to dissipate energy has been a major tool for designing stable haptic interfaces in most passivity-based approaches. However, virtual damping is known to dissipate a limited amount of energy. It even generates energy during hig... Read More about Virtual inertia as an energy dissipation element for haptic interfaces.

Bio-inspired knee joint: Trends in the hardware systems development (2021)
Journal Article
Etoundi, A. C., Semasinghe, C. L., Agrawal, S., Dobner, A., & Jafari, A. (2021). Bio-inspired knee joint: Trends in the hardware systems development. Frontiers in Robotics and AI, 8, https://doi.org/10.3389/frobt.2021.613574

The knee joint is a complex structure that plays a significant role in the human lower limb for locomotion activities in daily living. However, we are still not quite there yet where we can replicate the functions of the knee bones and the attached l... Read More about Bio-inspired knee joint: Trends in the hardware systems development.

Multilateral teleoperation over communication time delay using the time-domain passivity approach (2019)
Journal Article
Ryu, J., Ha-Van, Q., & Jafari, A. (2020). Multilateral teleoperation over communication time delay using the time-domain passivity approach. IEEE Transactions on Control Systems Technology, 28(6), 2705 - 2712. https://doi.org/10.1109/TCST.2019.2948126

A general framework to stabilize multilateral teleoperation system over a communication time delay based on the well-known time-domain passivity approach (TDPA) is proposed. The uniqueness of this framework is that it is independent of the amount of... Read More about Multilateral teleoperation over communication time delay using the time-domain passivity approach.

Enhancing the rate-hardness of haptic interaction: Successive force augmentation approach (2019)
Journal Article
Singh, H., Janetzko, D., Jafari, A., Weber, B., Lee, C. I., & Ryu, J. H. (2020). Enhancing the rate-hardness of haptic interaction: Successive force augmentation approach. IEEE Transactions on Industrial Electronics, 67(1), 809-819. https://doi.org/10.1109/TIE.2019.2918500

© 1982-2012 IEEE. There have been numerous approaches that have been proposed to enlarge the impedance range of haptic interaction while maintaining stability. However, enhancing the rate-hardness of haptic interaction while maintaining stability is... Read More about Enhancing the rate-hardness of haptic interaction: Successive force augmentation approach.

The Input-to-State Stable (ISS) approach for stabilizing haptic interaction with virtual environments (2017)
Journal Article
Jafari, A., Nabeel, M., & Ryu, J. H. (2017). The Input-to-State Stable (ISS) approach for stabilizing haptic interaction with virtual environments. IEEE Transactions on Robotics, 33(4), 948-963. https://doi.org/10.1109/TRO.2017.2676127

© 2004-2012 IEEE. Passivity has been a major criterion for designing a stable haptic interface due to its numerous advantages. However, passivity-based controllers have suffered from the design conservatism of the passivity criterion, particularly wh... Read More about The Input-to-State Stable (ISS) approach for stabilizing haptic interaction with virtual environments.

Independent force and position control for cooperating manipulators handling an unknown object and interacting with an unknown environment (2016)
Journal Article
Ryu, J. H., Jafari, A., & Jee-Hwan, R. (2016). Independent force and position control for cooperating manipulators handling an unknown object and interacting with an unknown environment. Journal of The Franklin Institute, 353(4), 857-875. https://doi.org/10.1016/j.jfranklin.2015.12.010

© 2016 The Franklin Institute. Published by Elsevier Ltd. All rights reserved. This paper presents a unified framework for system design and control in cooperative robotic systems. It introduces a highly generalized cooperative system configuration t... Read More about Independent force and position control for cooperating manipulators handling an unknown object and interacting with an unknown environment.

Stable admittance type haptic interaction based on time domain passivity approach (2015)
Journal Article
Jafari, A., Totorkulov, K., & Ryu, J. (2015). Stable admittance type haptic interaction based on time domain passivity approach

In this paper, we propose a stable and high transparent admittance haptic display even in free space haptic rendering. Because considering admittance haptic rendering as a one-port network is not enough to detect the active energy, new representation... Read More about Stable admittance type haptic interaction based on time domain passivity approach.

6-DOF extension of memory-based passivation approach for stable haptic interaction (2014)
Journal Article
Jafari, A., & Ryu, J. H. (2015). 6-DOF extension of memory-based passivation approach for stable haptic interaction. Intelligent Service Robotics, 8(1), 23-34. https://doi.org/10.1007/s11370-014-0161-y

© 2014, Springer-Verlag Berlin Heidelberg. This paper extends previously proposed memory-based passivity approach (MBPA) to 6 degrees-of-freedom (DOF) haptic interactions. By introducing 6-DOF virtual proxy and virtual object, connected with haptic i... Read More about 6-DOF extension of memory-based passivation approach for stable haptic interaction.