This paper presents a new path planner for the exploration of previously unknown environments. The proposed algorithm uses a Next-Best-View (NBV) fashion to decide the movements ahead. A Rapidly-Exploring Random Tree ...
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ISBN:
(数字)9781728187631
ISBN:
(纸本)9781728187648
This paper presents a new path planner for the exploration of previously unknown environments. The proposed algorithm uses a Next-Best-View (NBV) fashion to decide the movements ahead. A Rapidly-Exploring Random Tree (RRT) is built and the node with the highest gain is the next configuration to execute, based on the amount of unmapped volume in the field of view (FoV) of the sensor employed. The proposed planner is able to send online a 3D occupancy map of the volume and work with a variety of different depth sensors. The performance is analyzed in various challenging simulations, such as exploration of a city street or a narrow tunnel. Moreover, real experiments indoor and outdoor were conducted to further validate the proposed approach results. In cases with large scale volumes, it can cover a wide range in affordable flight time.
The paper deals with the automated robotic assembly of complex casting molds from regular components. It addresses the issues od model decomposition and assembly sequence taking into account particularities of the glu...
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The problem of finding the shortest path for manipulators with obstacle avoidance has many solutions. The paper presents the usage of well-known methods for solving that problem using mixed reality glasses. Glasses co...
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This paper is focused on control of variable stiffness actuators (VSA). One of the new approaches in this area is based on a linear VSA model, whose main features are the directly controlled linear stiffness dynamics ...
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In this article, trajectory optimization of an inverted pendulum on a cart with machine learning tools is analyzed. Reinforcement learning and Q-learning algorithm are used for searching and optimization of trajectori...
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In this paper, the problem of controlling compliance of a robotic tensegrity structure (finding the state of the structure which produces desired stiffness) is discussed. Tensegrity structures have a number of unique ...
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ISBN:
(数字)9781728157429
ISBN:
(纸本)9781728157436
In this paper, the problem of controlling compliance of a robotic tensegrity structure (finding the state of the structure which produces desired stiffness) is discussed. Tensegrity structures have a number of unique properties: they are well suited for uncertain environments, are easily deployed, impact resistant, foldable and light-weight and thus provide a desirable component for a number of robotics applications. They are currently being studied as a structural element of robotic extraterrestrial probes, crawling robots, swimming robots and others. The compliance control problem here is solved by a convex relaxation of the original nonconvex program, which in turn is done by introducing two linear models: one for the stiffness matrix and one for the elastic forces. Solution accuracy is controlled by introducing an iterative scheme, solving the convex problem on each iteration. Proposed algorithm converges providing accuracy better than 10 -2 N/m in terms of stiffness using only 10 iterations of the algorithm, and the accuracy of force equilibrium is better than 1 N.
The paper is focused on the problem of the stiffness model estimation that could be used in combination with double encoders for the detection of the compliance errors and applied forces. Algebraic approach is propose...
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ISBN:
(数字)9781728187631
ISBN:
(纸本)9781728187648
The paper is focused on the problem of the stiffness model estimation that could be used in combination with double encoders for the detection of the compliance errors and applied forces. Algebraic approach is proposed based on knowledge of link stiffness parameters and kinematics of the robot. The application of this technique is demonstrated in the example of a 3-link manipulator.
This study is focused on the problem of robot physical interaction with environment. Physical interaction in case of collaborative industrial robots means one or more physical contact with robot and work piece, robot ...
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In this paper, a control pipeline for an industrial robot arm is presented. The robot is proposed as a test bench for machine learning experiments, where it is important to have a reliable and repeatable behavior of t...
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This paper is focused on control of variable stiffness actuators (VSA). One of the new approaches in this area is based on a linear VSA model, whose main features are the directly controlled linear stiffness dynamics ...
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ISBN:
(纸本)9781450372527
This paper is focused on control of variable stiffness actuators (VSA). One of the new approaches in this area is based on a linear VSA model, whose main features are the directly controlled linear stiffness dynamics and bilinear output torque model. The paper tackles the problem of motion planning for linear VSA. While the problem appears to be non-convex, the study demonstrates that it is possible to introduce a new parametrization of the model that produces a convex optimization formulation. It is proposed to limit the power input allowed for the controller, making sure that it does not exceed the physical capabilities of the motors implementing the trajectories. The paper shows the behavior of the planer when it reaches the limits of the allowed power input. The paper demonstrates the use of the proposed planner in planning trajectories for a lower-limb exoskeleton performing sit-to-stand transfer.
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