In this paper, a non-linear stable control scheme is developed for performing a cooperative task by hydraulic manipulators. The goal is to design it controller that allows two or more hydraulic robots to coordinately regulate an object's position orientation while maintaining specified load sharing between the manipulators as well as desired internal forces on the object. First the complete dynamic model of the whole system is described. Then. a controller is designed, augmented by an on-line updating law to eliminate the steady-state error, due to lack of knowledge about the payload. Extended Lyapunov's second method is used for stability analysis of the control system. The stability of the system is guaranteed by constructing a smooth Lyapunov function, Simulations are performed to substantiate the controller developed in this paper.
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