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The impedance control of a 3-degree-of-freedom (DOF) xyθ planar parallel link mechanism (PLM) with four redundant actuators, i.e., a 3D4M PLM, is proposed. The impedance control requires forward kinematics, which gives the position and orientation of the end effector of the PLM. The notable link arrangement of the 3D4M PLM makes it easy to derive the forward kinematics, which have been difficult to...
In this paper, the problem of position and force control of a robotic manipulator in contact with the environment is considered. The Hybrid Impedance Control (HIC) methodology is employed to control the position of the end-effector in such a way that the robot exhibits a desired dynamic property and hence desired Impedance which in turn results in tracking the interaction force. It is assumed that...
We reported a novel impedance control method based on a fractional calculation inspired by the viscoelastic properties of biomaterials such as muscle. This fractional impedance controller was found to realize superior impact absorption for the purpose of flexible contact for assistive and rehabilitation robots. This paper presents a preliminary evaluation of this concept using simulations and experiments...
In this paper, the neural impedance controller is formulated to regulate the contact force with the environment. When robot uncertainties are present, the performance of the impedance controller is degraded. To compensate for uncertainties in both robot dynamics and environment, neural network is introduced at the desired trajectory. The training signal is defined to satisfy the desired goal. This...
Variable impedance actuation is characterized by the ability to independently set output force and output impedance for a robotic device. Adjusting the output impedance in real-time allows a device to better adapt to a variety of tasks, operate in human-like fashion, and support human safety. This paper focuses on a series clutch actuator based on magnetorheological fluid which allows a fast, electrical...
This paper presents a compliant control architecture for comanipulation in the medical robotics field. The kinematics and dynamics models of robots are described and its linearization by non linear feedback is implemented. The impedance control concept is introduced and representation in arbitrary frames techniques are presented. Various virtual walls restrictions to the robot end-effector are made...
Robot-assisted rehabilitation therapy has been paid a lot of attention by robot researchers and therapists for its potential ability of rehabilitation training and assess. The purpose of our study is to develop a fuzzy adaptive control strategy based on traditional impedance control for providing optimal force to stroke patients. An online identification of parameters was used to estimate impaired...
New gains tuning and impedance control method were addressed for flexible base moving manipulators. Slow and fast dynamics of robot are decoupled using singular perturbation method. Then, using sliding mode control method, an impedance control law was derived for the slow dynamics. Combined control law was proposed comprising the impedance control law and a feedback control law for the fast dynamics...
This paper proposes a force-position multilateral shared control architecture for dual-user teleoperation systems that is robust stable to uncertainties in userspsila hand dynamics, environment impedance and userspsila dominance over the task. The proposed controller is evaluated for intermittent contact for different levels of dominance of the users over the task using dynamic simulations.
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