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Cable-climbing robot is designed to inspect the cable-stayed bridge, releasing workers from dangerous environment. Meanwhile, the vibration of cable with a robot should be researched. The cables of bridge will be seriously damaged when large amplitude occurs. Not only that, the inertial force by acceleration should be emphasized as well. In this paper, a cable-climbing robot is introduced first. Then...
This paper presents a new type of leg-wheeled robot, which is constructed with passive wheels and the idea of reduced degrees of freedom (DOF). Even though there are variety types of mobile robots researched, some of them cannot be used practical purpose because of their high number of DOF, resulting in complex structure and complicated control system. Typical leg-wheeled robots also have a high number...
We report a swarm robots circle formation control model that is based on intra virtual viscoelastic connectivity between the neighbors. The model can dynamically form a uniform circle using only the distance estimation among the neighbors, the model is fully decentralized and scalable by which a circle can be dynamically formed whatever the number of the robots being implicated. Based on the equilibrium...
It is a critical task to teleoperate a robot in a partially known or unstructured environment without any assistance. In this paper, local implicit surface based virtual fixtures are generated real time in a point cloud augmented virtual environment for operation guidance. The point-set implicit local surface method is modified to accomplish local forbidden region virtual fixtures. The robot-centered...
With the rapid development of robotics, dual-arm robots have been more and more widely used. Compared with the traditional single manipulator, it is very challenging for a dual-arm robot in modelling, planning and control. In this paper, we propose two compliance control methods for dual arm coordination to meet different requirements of fine manipulation tasks, such as payload carrying, assembly...
Classical control approaches to robot force control have been extensively addressed by research in the last decades and are now considered a paradigm when dealing with force control for industrial robots. With this respect, the present paper exploits the capability of state-of-the-art Quadratic Programming (QP) solvers to specify a simple and intuitive constraint-based optimization strategy aiming...
In this paper a quasi-static framework for optimally controlling the contact force distribution is experimentally verified with the full-size compliant humanoid robot Walk-Man. The proposed approach is general enough to cope with multi-contact scenarios, i.e. robot-environment interactions occurring on feet and hands, up to the more general case of whole-body loco-manipulation, in which the robot...
This paper proposes a method to design low-cost robotic hands that require almost toolless assembly, and have special transmissions and joint mechanisms. The transmissions consist of active and passive gear trains manufactured by 3D printers to realize coordinated motions among joints and to transmit the driving force to underactuated joints. The joints are designed with pop-in structures to simplify...
During human-robot collaboration tasks, we may physically touch the robot at a generic location and engage an intentional exchange of forces while realizing coordinated motion of the common contact point. In order to control the relative motion and the exchanged contact forces, the latter need to be estimated without using any local force sensing device. Building upon our recent works, we generalize...
Learning sequential force interaction tasks from kinesthetic demonstrations is a promising approach to transfer human manipulation abilities to a robot. In this paper we propose a novel concept to decompose such demonstrations into a set of Movement Primitives (MPs). The decomposition is based on a probability distribution we call Directional Normal Distribution (DND). To capture the sequential properties...
This paper proposes a robotics therapeutic massage evaluation system using electroencephalogram (EEG) signal analysis approach. An anthropomorphic dual arm robot is developed in this work for massage application. Compare to other massage systems, our dual arm robot can provides diversified massage techniques through the impedance control of both Cartesian space and joint space. In order to evaluate...
In this paper we present an interactive system to enhance bilateral teleoperation through online virtual fixtures generation and task switching. This is achieved using a stereo camera system which provides accurate information of the surrounding environment of the robot and of the tasks that have to be performed in it. The use of the proposed approach aims at improving the performances of bilateral...
This paper describes the development of one DoF robotic hand that makes human laugh by tickling through rubbing underarm. Laughter is attracting research attention because it enhances health by treating or preventing mental diseases. However, laughter has not been used effectively in healthcare because the mechanism of laughter is complicated and is yet to be fully understood. The development of a...
We propose an online iterative path optimisation method to enable a Baxter humanoid robot to assist human users to dress. The robot searches for the optimal personalised dressing path using vision and force sensor information: vision information is used to recognise the human pose and model the movement space of upper-body joints; force sensor information is used for the robot to detect external force...
Due to the faster-is-slower phenomenon in emergency escape, it is desirable to regulate pedestrian flow at the exit or a bottleneck. Modification of pedestrian facilities was previously studied to increase the efficiency and safety by the transportation community. We propose a robot-assisted pedestrian regulation scheme and study passive human-robot interaction (HRI), where the robot acts as a dynamic...
Admittance control is a well-established and popular control strategy in modern robotics. However, the standard admittance controller has several limitations. First, the passivity can be guaranteed by finding a set of control parameters that makes the admittance function positive real. However, this approach cannot be applied to multi degrees-of-freedom robot because it requires transfer function...
Industrial robots are often used for the simulation of satellites during on orbit servicing. In order to cover also the docking phase, both robots are equipped with force-torque sensors, and the measured forces and torques are taken to compute the desired motion of the position controlled robots. Since the system dynamics of robots and of free floating bodies obviously differ, for each robot we distinguish...
This paper presents a novel approach for human-robot cooperation in tasks with dynamic uncertainties. The essential element of the proposed method is a multi-modal interface that provides the robot with the feedback about the human motor behaviour in real-time. The human muscle activity measurements and the arm force manipulability properties encode the information about the motion and impedance,...
In this paper, we present deformable configuration control — a fully distributed algorithm that allows multiple robots to deform their configuration to avoid various shapes of obstacles while maintaining connectivity. Robots contacted with an obstacle first estimate the width of an obstacle by sharing bumped status of individual robots, and choose an appropriate obstacle avoidance scenarios between...
We present a reactive multi-agent push system for a large set of objects. The behavior for the pushing agents consists of: 1) selecting and updating an object set to push, 2) reaching positions near the objects to start influencing, 3) pushing the objects along a path to the goal region, and 4) regrouping when needed to ensure the group is packed tightly enough. The emergent properties of the behavior...
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