Adaptive Control for Gap Variation in Narrow Robotic Welding.

Intelligent Control of Modular Robotic Welding Cell

Although robotic machines are routinely used for welding, such machines do not normally incorporate intelligent capabilities. We are studying the general problem of formulating usable levels of intelligence into welding machines. From our perspective, an intelligent machine should: incorporate knowledge of the welding process, know if the process is operating correctly, know if the weld it is m...

Designing a Robust Control Scheme for Robotic Systems with an Adaptive Observer

This paper introduces a robust task-space control scheme for a robotic system with an adaptive observer. The proposed approach does not require the availability of the system states and an adaptive observer is developed to estimate the state variables. These estimated states are then used in the control scheme. First, the dynamic model of a robot is derived. Next, an observer-based robust contr...

Combined Temperature and Force Control for Robotic Friction Stir Welding

Nonlinear Adaptive H∞ Control for Robotic Manipulators

A new class of adaptive nonlinear H∞ control for robotic manipulators is proposed in this manuscript. Those control strategies are derived as solutions of particular nonlinear H∞ control problems, where both disturbances and estimation errors of unknown system parameters are regarded as exogenous disturbances to the processes, and the 2 gains from those uncertainties to generalized outputs are ...

Adaptive Nonlinear Control Algorithms for Robotic Manipulators

In this paper some adaptive nonlinear multivariable techniques used in the control of robotic manipulators are presented. The nonlinear control law and state feedback are used in achieving a linear inputoutput behavior for the controlled system. For the design of the adaptive nonlinear control, the exact feedback input-output linearization and the method of gradient are used. The nonlinear cont...