this paper presents the design and modeling of a lightweight tendon actuated robotic limb. the mechanical structure consists of a sequence of four semi-rigid segments realized in thermoplastic polyurethane material an...
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In this paper the dynamics equations for a mobile robot, named PatrolBot, will be developed, using new concepts in advanced mechanics, based on important scientific researches of the main author, concerning the kineti...
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ISBN:
(纸本)3908451884
In this paper the dynamics equations for a mobile robot, named PatrolBot, will be developed, using new concepts in advanced mechanics, based on important scientific researches of the main author, concerning the kinetic energy. In keeping the fact that the mathematical models of the mobile platforms are different besides the other robots types, due to nonholonomic constraints, these dynamic control functions, will be computed, according to these restrictions for robot motion.
Small sized robotic systems have operational advantages compared to large systems. they can also operate in fields of application where bigger systems would fail. this paper describes the specifications and the design...
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ISBN:
(纸本)9789897581984
Small sized robotic systems have operational advantages compared to large systems. they can also operate in fields of application where bigger systems would fail. this paper describes the specifications and the design of the autonomous underwater vehicle mu AUV(2). Technical details of the system regarding sensor setup, motorization and computing power are given. Furthermore, we present details about the system identification process and the implemented controller structure. Possible scopes of the mu AUV(2) are underwater exploration, inspection tasks, development and evaluation of algorithms, education and competitions.
this paper is devoted to the navigation of a robot in orchard headlands using embedded sensors such as lasers, Lidars or cameras. the main idea is to consider a differential robot model directly in polar coordinates a...
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ISBN:
(纸本)9789897583803
this paper is devoted to the navigation of a robot in orchard headlands using embedded sensors such as lasers, Lidars or cameras. the main idea is to consider a differential robot model directly in polar coordinates and not in Cartesian coordinates which makes it possible to obtain simpler expressions of the outputs. then two nonlinear output state feedback controllers are proposed to track two shapes based on spirals allowing to go from one row of fruit trees to another. these controllers are based on an input to output linearization and proved to be very efficient on simulations.
this paper proposes a new approach for feature importance of neural networks and subsequently a methodology using the novel feature importance to determine useful sensor information in high performance controllers, us...
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ISBN:
(纸本)9789897584428
this paper proposes a new approach for feature importance of neural networks and subsequently a methodology using the novel feature importance to determine useful sensor information in high performance controllers, using a trained neural network that predicts the quasi-optimal gain in real time. the neural network is trained using the Covariance Matrix Adaptation Evolution Strategy (CMA-ES) algorithm, in order to lower a given objective function. the important sensor information for robotic control are determined using the described methodology. then a proposed improvement to the tested control law is given, and compared withthe neural network's gain prediction method for real time gain tuning. As a results, crucial information about the importance of a given sensory information for robotic control is determined, and shown to improve the performance of existing controllers.
In this work the application of six-axis robots for robot-based industrial X-ray computed tomography (CT) imaging is investigated. In contrast to classical Cartesian manipulators with a turntable used in industrial co...
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ISBN:
(纸本)9789897583803
In this work the application of six-axis robots for robot-based industrial X-ray computed tomography (CT) imaging is investigated. In contrast to classical Cartesian manipulators with a turntable used in industrial cone-beam CT, robots offer increased flexibility regarding scanning trajectories. the increased flexibility with respect to scanning trajectories helps to gather highly informative content from alternative ray paths for a high-quality 3D reconstruction of the object to be scanned. Using numerical simulations we show that this additional informations increase the image quality of a CT scan of a multi-material measuring object, consisting of tantalum spheres and a carbon structure.
Domain Specific Languages (DSL) are being used in several fields of industry. this paper shows how a DSL can be used in the wood industry, automizing some tasks through the use of robots. In this paper we also impleme...
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ISBN:
(纸本)9789897583049
Domain Specific Languages (DSL) are being used in several fields of industry. this paper shows how a DSL can be used in the wood industry, automizing some tasks through the use of robots. In this paper we also implement a syntax to define robot instructions inside a high-level abstraction layer to simplify these instructions and to develop a reliable tool for developers in order to avoid errors and allow for faster development. this paper also covers considerations on how to choose the kind of DSL that best fulfills our requirements and provides an example described in detail.
the classical optimal path following problem considers the problem of moving optimally along a predefined geometric path under technological restrictions. In contrast to optimal path following, optimal tube following ...
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ISBN:
(纸本)9789897581984
the classical optimal path following problem considers the problem of moving optimally along a predefined geometric path under technological restrictions. In contrast to optimal path following, optimal tube following allows deviations from the initial path within a predefined tube to reduce cost even more. the present paper proposes a modern approach that treats this non-convex problem in task space. this novel method also provides a simple way to derive optimal trajectories within a tube described in terms of polygonal lines. Numerical examples are presented that allow to compare the proposed method to existing joint space approaches.
the main contribution of this paper is a method for optimizing the layout of workcells taking into consideration boththe reachability of the robot as well as the expected cycle time. To analyse the reachability for s...
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ISBN:
(纸本)9789897583049
the main contribution of this paper is a method for optimizing the layout of workcells taking into consideration boththe reachability of the robot as well as the expected cycle time. To analyse the reachability for systems using sensors to pose estimate objects, the method uses a combination of discrete samples over the space in which objects are located and a manipulability measure based on the determinant of the manipulator Jacobian. To compute the expected cycle time for the robot, the method includes a simulated controller, which is optimized to estimate the performance of the physical robot. For the optimization of the workcell layout the proposed method based on applying Gaussian penalties in local minima is compared to three existing methods for global optimization. For the optimization of the simulated controller three different local methods are compared along with one global.
this article describes the development of a methodology for the learning of visual and reactive behaviours using reinforcement learning. Withthe use of artificial vision the environment is perceived in 3D, and it is ...
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ISBN:
(纸本)9789728865832
this article describes the development of a methodology for the learning of visual and reactive behaviours using reinforcement learning. Withthe use of artificial vision the environment is perceived in 3D, and it is possible to avoid obstacles that are invisible to other sensors that are more common in mobile robotics. Reinforcement learning reduces the need for intervention in behaviour design, and simplifies its adjustment to the environment, the robot and the task. the designed methodology is intended to be general;thus, in order to change the desired behaviour, only the reinforcement and the filtering of the image need to be changed. For the definition of the reinforcement a laser sensor is used, and for the definition of the states a fixed 3x3 grid is used. the behaviours learned were wall following, object following, corridor following and platform following. Results are presented with a Pioneer 2 AT. A Gazebo 3D simulator was used for the Learning and testing phase, and a test of the wall following behaviour was carried out in a real environment.
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