{"title":"A Comparison of Path Planning Algorithms for Omni-Directional Robots in Dynamic Environments","authors":"Felipe Haro, M. Torres","doi":"10.1109/LARS.2006.334319","DOIUrl":"https://doi.org/10.1109/LARS.2006.334319","url":null,"abstract":"The scope of this paper is to analyze and compare three path planning methods for omni-directional robots, which are based on a) the bug algorithm, b) the potential fields algorithm, and c) the A* algorithm for minimum cost path with multiresolution grids. The approaches are compared in terms of computational costs and the resulting path lengths. Results obtained indicate that the bug algorithm is a suitable choice for this type of application as its computational cost is lower than that of the other methods. Furthermore, minor modifications of the standard bug algorithm, such as the tangent following modification, allow the path planner to handle well the situations encountered in typical multi-robot environments","PeriodicalId":129005,"journal":{"name":"2006 IEEE 3rd Latin American Robotics Symposium","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124977472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cartesian Sliding PID Control Under Jacobian Uncertainty of Robotics Hands: Executing Transition Tasks","authors":"R. García-Rodríguez, Vicente Parra‐Vega","doi":"10.1109/LARS.2006.334342","DOIUrl":"https://doi.org/10.1109/LARS.2006.334342","url":null,"abstract":"The necessity to make complex tasks have increased in many robotics systems such as cooperatives robots or robotics hands. When each robot execute free and constrained motion tasks involves change into dynamics for rigid contact. At the time of impact regime the derivative of the velocity vector is not well-defined, therefore it is difficult to design controller for transition task. The trivial approach to avoid the impact is presented commuting consistently ODE- and DAE-based controller to insure formally zero contact velocity, -at any given arbitrarily time and for any initial condition. One way to circumvent this, it is to know exactly the commuting time to guarantee zero contact velocity such that impulsive dynamics will not arise and stable transition can be obtained. The novelty of our approach is characterized in the fact that very fast decentralized Cartesian cooperative tracking is obtained without using the model of the robot nor exact knowledge of inverse Jacobian. The model-free sliding PD force controller is used to compensate nonlinear dynamics of each robot and the residual error dynamics is finally canceled by a chattering-free Cartesian sliding mode to guarantee convergence of position and force tracking errors. It is important notice that inverse kinematics are avoided by synthesized Cartesian, rather than joint error sliding surfaces, thus the commuting manifold does not depend on the Jacobian, therefore, the system is robust against Jacobian uncertainty. Simulations study of two robots manipulating a constrained object shows that system is robust under parametric uncertainty of robots","PeriodicalId":129005,"journal":{"name":"2006 IEEE 3rd Latin American Robotics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129514463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Atkinson, J. Gonzalez, C. Castro, D. Rojas, Á. Arriagada, F. Gutierrez
{"title":"UdeCans Team Description","authors":"J. Atkinson, J. Gonzalez, C. Castro, D. Rojas, Á. Arriagada, F. Gutierrez","doi":"10.1109/LARS.2006.334347","DOIUrl":"https://doi.org/10.1109/LARS.2006.334347","url":null,"abstract":"In this document, the UdeCans Robocup team and its contributions to Robocup 4-legged 2006 are introduced. The main focus of the team, the system's architecture and the main motivation are also described","PeriodicalId":129005,"journal":{"name":"2006 IEEE 3rd Latin American Robotics Symposium","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133557611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Human-inspired walking-style for a low-cost biped prototype","authors":"A. Aceves-López, A. Melendez-Calderon","doi":"10.1109/LARS.2006.334339","DOIUrl":"https://doi.org/10.1109/LARS.2006.334339","url":null,"abstract":"Many ongoing projects are being done in the field of humanoid robotics. Studies in the generation of human-like motions for humanoids based on human-motion-captured-data (HMCD) have demonstrated that this is feasible. Walking style patterns using only the ZMP concept have shown that the resulting motion of humanoids are not natural as human's motion. By combining human-motion captured-data with other techniques, it is possible to improve humanoids' walking style. On this matter, this work is intended to apply HMCD to MAYRA humanoid prototype and show its advantages versus the classic statically stable humanoid walking with semi-circular foot-trajectory. We conclude that signals obtained directly from human-walk are smoother rather than those signals obtained from mathematical foot-trajectory. This may lead to a simplification in the control system for the MAYRA biped prototype","PeriodicalId":129005,"journal":{"name":"2006 IEEE 3rd Latin American Robotics Symposium","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116167176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}