4,004 research outputs found
The eel-like robot
International audienceThe aim of this project is to design, study and build an ``eel-like robot'' prototype able to swim in three dimensions. The study is based on the analysis of eel swimming and results in the realization of a prototype with 12 vertebrae, a skin and a head with two fins. To reach these objectives, a multidisciplinary group of teams and laboratories has been formed in the framework of two French projects
Multi-variable Constrained Control Approach for a Three-Dimensional Eel-like Robot
International audienceIn this paper, a multi-variable feedback design for the 3D movement of an eel-like robot is presented. Such a robot is under construction in the context of a national French robotic project. The proposed feedback enables the tracking of a desired 3D position of the eel's head as well as the stabilization of the rolling angle. The control design is based on a recently developed reduced model that have been validated using a 3D complete continuous model. Several scenarios are proposed to assess the efficiency of the proposed feedback law
Macro-continuous computed torque algorithm for a three-dimensional eel-like robot
International audienceThis paper presents the dynamic modeling of a continuous three-dimensional swimming eel-like robot. The modeling approach is based on the "geometrically exact beam theory" and on that of Newton-Euler, as it is well known within the robotics community. The proposed algorithm allows us to compute the robot's Galilean movement and the control torques as a function of the expected internal deformation of the eel's body
Poincaré-Cosserat equations for Lighthill three-dimensional dynamic model of a self propelled eel devoted to Robotics
International audienceIn this article, we propose a dynamic model of the three-dimensional eel swim. This model is analytical and suited to the on-line control of eel-like robots. The proposed solution is based on the Large Amplitude Elongated Body Theory of Lighthill and a working frame recently proposed in [1] for the dynamic modeling of hyper-redundant robots. This working frame was named "macro-continuous" since at this macroscopic scale, the robot (or the animal) is considered as a Cosserat beam internally (and continuously) actuated. This article proposes new results in two directions. Firstly, it achieves an extension of the Lighthill theory to the case of a self propelled body swimming in three dimensions, while including a model of the internal control torque. Secondly, this generalization of the Lighthill model is achieved due to a new set of equations which is also derived in this article. These equations generalize the Poincaré equations of a Cosserat beam to the case of an open system containing a fluid stratified around the slender beam
What are you or who are you? The emergence of social interaction between dog and Unidentified Moving Object (UMO)
Robots offer new possibilities for investigating animal social behaviour. This method enhances controllability and
reproducibility of experimental techniques, and it allows also the experimental separation of the effects of bodily
appearance (embodiment) and behaviour. In the present study we examined dogs’ interactive behaviour in a problem
solving task (in which the dog has no access to the food) with three different social partners, two of which were robots and
the third a human behaving in a robot-like manner. The Mechanical UMO (Unidentified Moving Object) and the Mechanical
Human differed only in their embodiment, but showed similar behaviour toward the dog. In contrast, the Social UMO was
interactive, showed contingent responsiveness and goal-directed behaviour and moved along varied routes. The dogs
showed shorter looking and touching duration, but increased gaze alternation toward the Mechanical Human than to the
Mechanical UMO. This suggests that dogs’ interactive behaviour may have been affected by previous experience with typical
humans. We found that dogs also looked longer and showed more gaze alternations between the food and the Social UMO
compared to the Mechanical UMO. These results suggest that dogs form expectations about an unfamiliar moving object
within a short period of time and they recognise some social aspects of UMOs’ behaviour. This is the first evidence that
interactive behaviour of a robot is important for evoking dogs’ social responsiveness
Analysis of underwater snake robot locomotion based on a control-oriented model
This paper presents an analysis of planar underwater snake robot locomotion in the presence of ocean currents. The robot is assumed to be neutrally buoyant and move fully submerged with a planar sinusoidal gait and limited link angles. As a basis for the analysis, an existing, controloriented model is further simplified and extended to general sinusoidal gaits. Averaging theory is then employed to derive the averaged velocity dynamics of the underwater snake robot from that model. It is proven that the averaged velocity converges exponentially to an equilibrium, and an analytical expression for calculating the forward velocity of the robot in steady state is derived. A simulation study that validates both the proposed modelling approach and the theoretical results is presented.Prepint - (c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works
Landsat Satellite Image Segmentation Using the Fuzzy ARTMAP Neural Network
This application illustrates how the fuzzy ARTMAP neural network can be used to monitor environmental changes. A benchmark problem seeks to classify regions of a Landsat image into six soil and crop classes based on images from four spectral sensors. Simulations show that fuzzy ARTMAP outperforms fourteen other neural network and machine learning algorithms. Only the k-Nearest-Neighbor algorithm shows better performance (91% vs. 89%) but without any code compression, while fuzzy ARTMAP achieves a code compression ratio of 6:1. Even with a code compression ratio of 50:1 fuzzy ARTMAP still maintains good performance (83%). This example shows how fuzzy ARTMAP can combine accuracy and code compression in real-world applications.Office of Naval Research (N00014-92-J-401J, N00014-91-J-4100, N00014-92-J-4015); National Science Foundation (IRI 90-00530
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