This paper presents formulation and application of a strategy for control of two six degree-of-freedom robots carrying a common object in a cooperative mode. The paper focuses on control of internal forces that are generated when two or more robots carry an object in coordination. A combined position-force control scheme based on fuzzy logic is proposed. The controller scheme developed has been implemented successfully on two six degree-of-freedom ABB industrial robots. The simulations and the experiments performed demonstrate that the proposed control strategy is able to considerably decrease the internal forces.

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