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This paper describes the concept, design and realization of a novel manipulator system for a multirotor aerial robot. The proposed manipulator system consists of three robotic arms attached to a multirotor frame. To overcome the limited payload capabilities in multirotor aerial platforms, the same set of on-board manipulators are used to realize various tasks, primarily the manipulation or grasping of objects of various sizes. Furthermore, they can provide aid in complex navigation tasks by doing physical, contact-based obstacle avoidance and are able to act as adaptive landing gear in uneven terrain. The design requirements and the analysis to realize these tasks is discussed. The proposal is supported with the successful demonstration of these tasks using the aerial multi manipulator system in an outdoor environment.

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In this study, we propose a long-reach aerial manipulation system with a wire-suspended device that allows the airframe to maintain its position at the desired distance away from the target. We implemented a feedback communication between the multirotor and wire-suspended device to maintain the position of the wire-suspended device directly below the multirotor while maintaining a constant distance from the target. The multirotor communicates its velocity and relative position to the wire-suspended device to control the ducted fans, whereas the wire-suspended device transmits the attitude and distance from the ground to the multirotor to control the winch. The designed controller for the ducted fans allows the wire-suspended device to behave like a long rigid robotic arm. The performance of the designed controller was verified by navigating the multirotor over stepped surfaces while the wire-suspended device was being lowered.