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Enhancing the force transparency of time domain passivity approach: Observer-based gradient controller (2019)
Presentation / Conference
Singh, H., Jafari, A., & Ryu, J. (2019, May). Enhancing the force transparency of time domain passivity approach: Observer-based gradient controller. Paper presented at The 2019 International Conference on Robotics and Automation (ICRA), Montreal, Canada

Passivity has been the most often used constraint for the stable controller design of bilateral teleoperation systems. Especially, Time Domain Passivity Approach (TDPA) has been used in many applications since it has been known as one of the least co... Read More about Enhancing the force transparency of time domain passivity approach: Observer-based gradient controller.

Design of anatomy-based 3D patient-specific knee replacement implant model from medical imaging (2018)
Presentation / Conference
Chong, J., Matthews, J., Jafari, A., & Appolinaire, E. (2018, June). Design of anatomy-based 3D patient-specific knee replacement implant model from medical imaging. Paper presented at 2018 The 2nd International Conference on Mechanical, System and Control Engineering (ICMSC 2018), Moscow, Russia

This paper focuses on the design of an anatomy-based 3D patient-specific knee replacement implant model, which is derived from medical imaging. The investigation extracted the knee profiles from MRI scans to develop a 3D model of the knee, including... Read More about Design of anatomy-based 3D patient-specific knee replacement implant model from medical imaging.

Multi degree-of-freedom successive stiffness increment approach for high stiffness haptic interaction (2016)
Presentation / Conference
Singh, H., Jafari, A., & Ryu, J. (2016, November). Multi degree-of-freedom successive stiffness increment approach for high stiffness haptic interaction. Paper presented at Asia Haptics, Kashiwanoha, Japan

In haptic interaction, stability and the object’s hardness perception are of great significance. Although numerous studies have been done for stable haptic interaction, however, most of them sacrifice the actual displayed stiffness as a cost of stabi... Read More about Multi degree-of-freedom successive stiffness increment approach for high stiffness haptic interaction.

Sliding mode hybrid impedance control of robot manipulators interacting with unknown environments using VSMRC method (2013)
Presentation / Conference
Jafari, A., Ryu, J., Rezaei, M., Monfaredi, R., Talebi, A., & Shiry Ghidary, S. (2013, October). Sliding mode hybrid impedance control of robot manipulators interacting with unknown environments using VSMRC method. Paper presented at The 44th IEEE International Symposium on Robotics (ISR 2013), Seoul, Korea

In the present paper, the objective of hybrid impedance control is specified and a robust hybrid impedance control approach is proposed. Based on the concept of hybrid control, the task space is decomposed into position and force controlled subspaces... Read More about Sliding mode hybrid impedance control of robot manipulators interacting with unknown environments using VSMRC method.

Successive stiffness increment approach for high stiffness haptic interaction
Presentation / Conference
Singh, H., Jafari, A., & Ryu, J. Successive stiffness increment approach for high stiffness haptic interaction. Paper presented at IEEE Eurohaptics 2016 Conference

This paper proposes a method to further enlarge the displayed stiffness range of the impedance-type haptic interfaces. Numerous studies have been done for a stable haptic interaction in a wide impedance range. However, most of the approaches sacrific... Read More about Successive stiffness increment approach for high stiffness haptic interaction.

Independent force and position control for cooperating manipulators handling an unknown object interacting with an unknown environment
Presentation / Conference
Jafari, A., & Ryu, J. Independent force and position control for cooperating manipulators handling an unknown object interacting with an unknown environment. Paper presented at 44th International Symposium on Robotics (ISR) 2013

In this paper, we consider two manipulators grasping a rigid object in contact with a deformable working surface, whose real physical parameters are unknown. Dynamics of the closed chain mechanism is expressed based on the objects center of mass, and... Read More about Independent force and position control for cooperating manipulators handling an unknown object interacting with an unknown environment.

An adaptive hybrid force/motion control design for robot manipulators interacting in constrained motion with unknown non-rigid environments
Presentation / Conference
Jafari, A., Ryu, J., Rezaei, M., Monfaredi, R., Talebi, A., & Ghidary, S. An adaptive hybrid force/motion control design for robot manipulators interacting in constrained motion with unknown non-rigid environments. Paper presented at IEEE ISR 2013

In the present paper, the objective of hybrid control is specified and an adaptive hybrid force/motion control approach is proposed. Based on the concept of hybrid control, the task space is decomposed into position and force controlled subspaces. An... Read More about An adaptive hybrid force/motion control design for robot manipulators interacting in constrained motion with unknown non-rigid environments.

Multi degree-of-freedom input-to- state stable approach for stable haptic interaction
Presentation / Conference
Jafari, A., Nabeel, M., & Ryu, J. Multi degree-of-freedom input-to- state stable approach for stable haptic interaction. Paper presented at IEEE World Haptics Conference (WHC 2015), Chicago

Passivity has been the most often used constraint for the controller design of haptic interfaces. However, the designed controller based on passivity constraint has been suffering from its conservatism, especially when the user wants to increase the... Read More about Multi degree-of-freedom input-to- state stable approach for stable haptic interaction.