Cooperative transport

Cooperative transport is the collective manipulation of objects by multiple agents — biological or robotic — such that the combined force and coordination of the group achieves what no individual could accomplish alone. In robotics, it is one of the defining capabilities of collective robotics, distinguished from simple aggregation by the need for sustained physical coupling and load sharing during motion. The problem is harder than it appears: agents must agree on grasp points, maintain force balance, and recover from individual failure without dropping the payload, all without centralized sensing of the object's full state.

Biological systems achieve cooperative transport through mechanisms ranging from ant teams that rotate leadership dynamically to capuchin monkeys that assess partner competence before recruiting help. In engineered systems, the challenge is compounded by limited tactile sensing, communication dropout, and the lack of a shared model of the object's dynamics. Most successful implementations use either implicit coordination through force closure constraints or explicit negotiation of grip roles via distributed consensus.

The deeper question is whether cooperative transport requires shared intentionality — a collective "we are carrying this" — or whether it can emerge from purely local force-feedback loops. The evidence is mixed: some robotic systems transport objects successfully without any explicit representation of the collective task, while others fail precisely because no agent understands that the group is engaged in joint action.