Modelling spherical joints in multibody systems

First Online: 14 October 2021Spherical joints are commonly utilized in many real-world scenarios. From the more simplistic to the more complex perspectives, spherical joints might be modelled considering different cases. Thus, the aim of this study is to analyze and compare the influence of different spherical joint modelling approaches, namely the ideal, dry, lubricated, and bushing models, on the dynamic response of multibody systems. Initially, the kinematic and dynamic aspects of the spherical joint models are comprehensively reviewed. In this process, several approaches are explored and studied considering the normal, tangential, lubrication and bushing forces experienced by the multibody systems in such cases of spherical joints. The application of the spherical joint models in the dynamic modeling and simulation of the spatial four bar mechanism is investigated. From the results obtained, it can be stated that the choice of the spherical joint model can significantly affect the dynamic response of mechanical multibody systems.This work has been supported by Portuguese Foundation for Sci ence and Technology, under the national support to R&D units grant, with the reference project UIDB/04436/2020 and UIDP/04436/2020, as well as through IDMEC, under LAETA, project UIDB/50022/2020

Una aproximación a las dinámicas sociales del ecosistema de emprendimiento e innovación de la zona metropolitana de Guadalajara (ZMG)

El trabajo tiene como objetivo identificar y describir en un ecosistema de emprendimiento e innovación los principales actores, los esfuerzos de colaboración, las vinculaciones entre ellos y los proyectos de innovación social de base tecnológica que se han generado a partir de esas relaciones y esfuerzos, para dar cuenta de las iniciativas transformadoras que a partir de una infraestructura de un ecosistema pueden favorecer el desarrollo social de una región. Para ello, se hizo una aproximación a partir de entrevistas y observaciones a diferentes actores del ecosistema de emprendimiento e innovación de la zona metropolitana de Guadalajara (ZMG) para dar cuenta de las dinámicas sociales (Camarinha, 2008; Kakko, 2014) que se generan y observar el papel de las personas, para el entendimiento de cómo emergen nuevos patrones de innovación. A partir de esta aproximación se encontró que la ZMG se encuentra inmersa en un ambiente donde existen instituciones de gobierno, organismos públicos, privados, universidad, centros de investigación e inversionistas y a la vez está rodeada de gente que comparte sus experiencias en las comunidades. Sin embargo, las conexiones existentes entre ellos son débiles para la Innovación Social de base Tecnológica (IST), en el sentido de que se consolidan pocos proyectos de IST. La realización del estudio permite concluir que a partir de la identificación de las organizaciones claves, los actores y las condiciones críticas del ambiente del ecosistema de emprendimiento e innovación de la ZMG, se constituye un incipiente ecosistema de innovación social. No obstante, el mapeo de los recursos del ecosistema lleva a la construcción de un marco que puede ayudar al desarrollo de una estrategia de emprendimiento e innovación social que desarrolle al ecosistema, al generar una infraestructura que vincule a los actores y sean aprovechadas las capacidades de cada uno de ellos.ITESO, A.C

The meaning of Social Innovation: A review of the literature

Social innovation has emerged as a key concept in the contemporary world, especially in the field of business and technology. This practice focuses on creating creative and sustainable solutions to social and environmental problems, and has proven to be a powerful tool for generating positive change in society. The literature on social innovation is vast and varied, including studies that explore its origins, definitions, models, success stories, and challenges. In this context, a review of the literature related to Social Innovation represents the contribution of this article to understand the different perspectives and trends in the social innovation ecosystem in Mexico.ITESO, A.C

Social Innovation: A Social Shared Competence

The article analyzes a conceptual framework to compares experiences of social innovation in Latin America, finding social innovation as a social shared competence, that crosses the borders between social and economic areas. The selected experiences are originated and guided by the satisfaction of a human need and the generation of relationships between individuals and groups of different spaces and scale. The impact of those experiences is recognized under the understanding of social innovation as a shared competence among actors. It is concluded that the different conceptualizations lead to a conceptual framework in which three key elements are proposed for their understanding: first, the orientation to social values; second, the human factor as motor, promoter and source of development; and third, alliances between different actors.ITESO, A.C

Morfologia externa dos adultos de Phthia picta (Drury, 1770) (Hemiptera: coreidae).

O objetivo deste trabalho foi descrever a morfologia externa do macho e da fêmea de Phthia picta (Drry, 1770), uma praga importante do tomateiro no Brasil