Papers by Elisane Briao Zanela
Seminário de Iniciação Científica, Seminário Integrado de Ensino, Pesquisa e Extensão e Mostra Universitária, Sep 8, 2015
Lecture notes in mechanical engineering, Jul 19, 2018
Dynamic modeling of cables in three-dimensional space is a problem with great difficulty and comp... more Dynamic modeling of cables in three-dimensional space is a problem with great difficulty and complexity. This article discusses a new dynamic modeling formalism, including applications in the underwater environment. It is assumed that the cable is formed by rigid links connected by elastic fictitious joints, allowing elevation, azimuth and torsion movements. Algorithms have been developed to automatically generate the dynamic model for any number of links selected for the discrete approximation of the flexible structure. Three practical situations are tested: cable out of the water with free terminal load; underwater considering dynamics with or without ocean current; with terminal load fixed to the seabed. Constraint forces obtained through proportional and derivative control were applied to the terminal load to fix it to the seabed. The algorithms were determined from the Euler-Lagrange formalism, and in all situations the simulations showed physically consistent results.
Ocean Engineering, Jul 1, 2016
Abstract A new theory for the dynamic modeling of cables is presented in this paper, focusing on ... more Abstract A new theory for the dynamic modeling of cables is presented in this paper, focusing on underwater applications. The main idea is to approximate the continuous flexibility of the cable by several rigid links connected by fictitious elastic joints, allowing three movements: elevation, azimuth and torsion. The Lagrangian of the system is written in a compact form and can be generated for any number of links chosen to represent the structural dynamics. The application of Euler–Lagrange equations allows to obtain the dynamic model, which in this article was developed analytically for the cases of 2, 3 and 4 links. The dynamic model's equations grow significantly with the growth of the number of links and a detailed analysis of this growth enabled the proposition of generic algorithms for the automatic generation of the vectors and matrices elements, for whatever number of considered links. This theory was proposed considering a cable fixed at one end and free at the other, containing a terminal load. However, it can be easily adapted to flexible structures fixed at both ends and for applications underwater or out of water. The generic algorithms proposed in this article allow fast and automatic retrieval of dynamic models of cables, considering a large number of links to represent the structural flexibility, that would be unfeasible to obtain manually.
Muito se discute sobre a importância dos processos de reciclagem e reutilizacao como uma das melh... more Muito se discute sobre a importância dos processos de reciclagem e reutilizacao como uma das melhores formas de preservar o meio ambiente. Qual seria o destino correto de tantos materiais descartados, muitas vezes, de maneira desapropriada? Em vista disso, objetivou-se, com a presente pesquisa, analisar diferentes materiais que possam ser reciclados e reutilizados na construcao civil. Realizou-se uma pesquisa de custos na utilizacao desses materiais, bem como o levantamento de dados sobre as diferentes regioes que investem na construcao sustentavel. O trabalho foi desenvolvido a partir de uma revisao bibliografica sobre o assunto proposto, isto e, o uso de diversas formas de materiais em construcoes do tipo sustentaveis. A historia do mundo mostra que a construcao civil sempre existiu para atender as necessidades basicas e imediatas do homem sem preocupacao com a tecnica aprimorada em primeiro momento. A construcao civil e uma atividade tendencialmente consumidora de recursos e, em ...
Uploads
Papers by Elisane Briao Zanela