A hyper-redundant robotic arm is a manipulator with many degrees of freedom, capable of executing tasks in cluttered environments where robotic arms with fewer degrees of freedom are unable to operate. This paper introduces a new method for modeling those manipulators in a completely dynamic way. The proposed method enables online changes of the kinematic structure with the use of a special function; termed “meta-controlling function”. This function can be used to develop policies to reduce drastically the computational cost for a single task, and to robustly control the robotic arm, even in the event of partial damage. The direct and inverse kinematics are solved for a generic three-dimensional articulated hyperredundant arm, that can be used as a proof of concept for more specific structures. To demonstrate the robustness of our method, experimental simulation results, for a basic “meta-controlling” function, are presented.
A new robotic system named "Hyper Finger" for minimally invasive surgery in deep organs has been developed. The finger size of the latest version is 10 mm and the entire system is much smaller and lighter, and can be set up on a camera tripod. This is one of the smallest master-slave robots in medicine. Each finger has nine degrees of freedom and several unique mechanisms are employed to solve the fundamental issues of conventional wire drive manipulators. The new concept and system were verified successfully by in-vivo remote minimally invasive surgery. Further improvements of the system toward a clinical version are now underway. A tendon-driven manipulator, the CT Arm, has a specific tendon traction transmission mechanism, in which a pair of tendons for driving a joint is pulled from base actuators via pulleys mounted on the based-side joints. The mechanism makes the most of the coupled drive function of the tendon tractions and thus enables the lightweight manipulator to exhibit enormous payload capability. By this tendon-driven mechanism, a multijoint manipulator with super-redundant degrees of freedom could be realized, which is suitable to the maintenance of nuclear reactors. In this article, we introduce the CT Arm and discuss the possibility of generating a multijoint maintenance manipulator for nuclear reactors, which must have super-redundant degrees of freedom. A position-coordination approach for a hyper-redundant manipulator to carry tools or inspection equipment passing through a hole to a work location in a nuclear reactor is also proposed. Computer simulation has been used to show the validity of the hyper-redundant... This paper presents the SnakeFighter concept and describes the generic element within this concept in the form of a water hydraulic snake robot. Applications of a SnakeFighter system are presented with focus on fire intervention tasks. The development of a water hydraulic snake robot that demonstrates the concept is described. The robot is the first water hydraulic snake robot ever constructed. The paper identifies design challenges of a complete SnakeFighter system and describes future research on this concept.