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1دورية أكاديمية
المؤلفون: Rene Alejandro Canceco de la Cruz, Caleb Carreño Gallardo, Alberto Diaz Diaz, Luis Adrian Zuñiga Aviles, Gabriel Plascencia Barrera, Jose Martin Herrera Ramirez
المصدر: Fibers, Vol 12, Iss 5, p 38 (2024)
مصطلحات موضوعية: Kevlar®, polymer composite, mechanical properties, quasi-static tensile test, Chemicals: Manufacture, use, etc., TP200-248, Textile bleaching, dyeing, printing, etc., TP890-933, Biology (General), QH301-705.5, Physics, QC1-999
الوصف: Polymer-based composites are widely used in the automotive, security, aeronautical and space industries, to mention a few. This is because of their good mechanical properties, which are similar to those of metals but with the attraction of being lightweight. Kevlar® is extensively used as a reinforcement in the security industry owing to its good ballistic properties. This investigation presents a mechanical characterization based on in-plane quasi-static tensile testing of Kevlar® 29/phenolic resin with a polyvinyl butyral composite using a universal testing system. The methodology developed for the preparation of the coupons is based on pressure, temperature and time. As a result of this work, elastic moduli (EL and ET), Poisson’s ratio (νLT), shear modulus (GLT) and strengths (XT, YT, S) were obtained. It is worth mentioning that there is scarce or no characterization of this material in the literature, and those studies that do characterize it do not present the coupons’ thermoforming conditions or the reasons for the coupons’ dimensions (width, length and thickness).
وصف الملف: electronic resource
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2دورية أكاديمية
المؤلفون: Efren Gorrostieta, Juvenal Rodriguez Resendiz, Emilio Vargas Soto, Luis Adrian Zuñiga Aviles, Saul Tovar Arriaga
المصدر: Ingeniería e Investigación, Vol 35, Iss 3, Pp 107-114 (2015)
مصطلحات موضوعية: Methodology, mechatronic, education, robotics., Engineering (General). Civil engineering (General), TA1-2040
الوصف: This article presents a methodology to teach students to develop mechatronic projects. It was taught in higher education schools, in different universities in Mexico, in courses such as: Robotics, Control Systems, Mechatronic Systems, Artificial Intelligence, etc. The intention of this methodology is not only to achieve the integration of different subjects but also to accomplish synergy between them so that the final result may be the best possible in quality, time and robustness. Since its introduction into the educational area, this methodology was evaluated and modified for approximately five years, were substantial characteristics were adopted. For the next ten years, only minor alterations were carried out. Fifteen years of experience have proven that the methodology is useful not only for training but also for real projects. In this article, we first explain the methodology and its main characteristics, as well as a brief history of its teaching in different educational programs. Then, we present two cases were the methodology was successfully applied. The first project consisted in the design, construction and evaluation of a mobile robotic manipulator which aims to be used as an explosives ordnance device. In the second case, we document the results of a project assignment for robotics tasks carried out by students which were formerly taught with the methodology.
وصف الملف: electronic resource
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3دورية أكاديمية
المصدر: International Journal of Advanced Robotic Systems, Vol 9 (2012)
مصطلحات موضوعية: Electronics, TK7800-8360, Electronic computers. Computer science, QA75.5-76.95
الوصف: This paper describes an experimental study of a novel methodology for the positioning of a multi-articulated wheeled mobile manipulator with 12 degrees of freedom used for handling tasks with explosive devices. The approach is based on an extension of a homogenous transformation graph (HTG), which is adapted to be used in the kinematic modelling of manipulators as well as mobile manipulators. The positioning of a mobile manipulator is desirable when: ( 1 ) the manipulation task requires the orientation of the whole system towards the objective; ( 2 ) the tracking trajectories are performed upon approaching the explosive device's location on the horizontal and inclined planes; ( 3 ) the application requires the manipulation of the explosive device; ( 4 ) the system requires the extension of its vertical scope; and ( 5 ) the system is required to climb stairs using its front arms. All of the aforementioned desirable features are analysed using the HTG, which establishes the appropriate transformations and interaction parameters of the coupled system. The methodology is tested with simulations and real experiments of the system where the error RMS average of the positioning task is 7. 91 mm, which is an acceptable parameter for performance of the mobile manipulator.
وصف الملف: electronic resource
Relation: https://doaj.org/toc/1729-8814
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4دورية أكاديمية
المؤلفون: Luis Adrian Zuñiga Aviles, Tadeusz Szkodny, Jesus Carlos Pedraza Ortega, Efren Gorrostieta Hurtado
المصدر: International Journal of Advanced Robotic Systems, Vol 7 (2010)
مصطلحات موضوعية: Electronics, TK7800-8360, Electronic computers. Computer science, QA75.5-76.95
الوصف: In the field of modeling and simulation of mechatronics designs of high complexity, is presented a systematic analysis of an IEDD unit [1] (improvised explosive device disposal) based in a new methodology for modeling and simulation divided into 6 stages in order to increase the accuracy of validation of whole system, this mechatronic unit is a Non-holonomic Unmanned wheeled mobile manipulator, MU-NH-WMM, formed by a Differential Traction and a manipulator arm with 4 degrees of freedom mounted on wheeled mobile base, hence the contribution of this work is a novel methodology based on a practice proposal of philosophy of mechatronics design, which establishes the suitable kinematics to coupled wheeled mobile manipulator, where the motion equations and kinematics transformations are the base of the specific stages in order to obtain the dynamic of coupled system, validating the behavior and the trajectories tracking, in order to achieve the complex tasks of approaching to work area and the appropiatehandling of explosive device, this work is focused in the first of them; such that the errors in the model can be detected and later confined by proposed control.
وصف الملف: electronic resource
Relation: https://doaj.org/toc/1729-8814
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