Adaptive bilateral control of teleoperators with actuator uncertainty and quantized input

Abstract

This article addresses the control and stabilization problem of bilateral teleoperator system with input quantized by the so-called hysteresis-type quantizer, where the joint actuator model, robot dynamics, and kinematics are uncertain. In order to overcome the control issue that only discrete and finite control values can be applied to the robot dynamics, a decomposition-based technique is adopted to cope with the quantized control signals. By incorporating the Nussbaumgain function to the proposed controller, an adaptive telecontrol scheme together with the parameter updating laws is developed to achieve position and velocity tracking of teleoperator system in the presence time delays without a priori knowledge of actuator and quantizer model parameters, upon which, the robot dynamics and kinematics uncertainties are also effectively accommodated. It is proven by the Lyapunov method that the closed-loop dynamics are bounded, and the position as well as velocity tracking errors converges to zero. Simulation results verify the proposed adaptive telecontrol scheme.

Sliding Mode Observer-based Control of Teleoperation System With Uncertain Dynamics and Kinematics

“…Many remarkable results have been obtained for control of teleoperation system [8][9][10][11][12][13][14][15][16]. The passivity-based control innovatively proposed in [8] has been the cornerstone of the teleoperation system control, which is further developed in [9] to address the problem of steadystate position as well as force tracking.…”

“…Therefore, it is also imperative to exploit advanced control approaches in the work space on the end-effector. Some attempts have been made to develop the control algorithms for task-space bilateral teleoperators [12][13][14][15]. In [13], an adaptive control is designed for nonlinear teleoperators in the presence of actuator uncertainty and quantized input.…”

“…Some attempts have been made to develop the control algorithms for task-space bilateral teleoperators [12][13][14][15]. In [13], an adaptive control is designed for nonlinear teleoperators in the presence of actuator uncertainty and quantized input. In [14], a transpose Jacobian control strategy is developed by employing passivity based technique with taking communication time delays into consideration.…”