Repositório Colecção:https://hdl.handle.net/1822/120452024-03-29T12:23:43Z2024-03-29T12:23:43ZCellular materials: structural behaviour, modelling and characterisationPeixinho, NunoDuarte, IsabelCampos, A. AndradeValente, Robertthttps://hdl.handle.net/1822/543792019-11-14T14:35:37Z2018-04-17T12:51:47ZTítulo: Cellular materials: structural behaviour, modelling and characterisation
Autor: Peixinho, Nuno; Duarte, Isabel; Campos, A. Andrade; Valente, Robertt
Editor: Peixinho, Nuno; Duarte, Isabel; Campos, A. Andrade; Valente, Robertt
<b>Tipo</b>: book2018-04-17T12:51:47ZA systematized approach to obtain dependable controller specifications for hybrid plantsSeabra, EuricoMachado, Joséhttps://hdl.handle.net/1822/369992019-07-10T13:44:48Z2015-09-09T22:12:16ZTítulo: A systematized approach to obtain dependable controller specifications for hybrid plants
Autor: Seabra, Eurico; Machado, José
Resumo: This chapter focuses on the problem that a designer of an automation system controller
must solve related with the correct synchronization between different parts of the controller
specification when this specification obeys a previously defined structure. If this
synchronization is not done according to some rules, and taking some aspects into
consideration, some dependability aspects concerning the desired behaviour for the system
may not be accomplished. More specifically, this chapter will demonstrate a systematized
approach that consists of using the GEMMA (Guide d`Etude des Modes de Marches et
d`Arrêts) (Agence Nationale pour le Developpement de la Production Automatisée)
[ADEPA], 1992) and the SFC (Sequential Function Chart) (International Electrotechnical
Commission [IEC], 2002) formalisms for the structure and specification of all the system
behaviour, considering all the stop states and functioning modes of the system. The
synchronization of the models, corresponding to the controller functioning modes and the
controller stop states, is shown in detail and a systematized approach for this
synchronization is presented. For this the advantages and disadvantages of the vertical
coordination and horizontal coordination proposed by the GEMMA formalism are
discussed and a case study is presented to explain the proposed systematic approach. A
complete safe controller specification is developed to control a hybrid plant. Also this
chapter presents and discusses a case study that applies a global approach for considering
all the automation systems emergency stop requirements. The definition of all the
functioning modes and all the stop states of the automation system is also presented
according the EN 418 (European Standard [EN], 1992) and EN 60204-1 (EN, 1997) standards.
All the aspects related to the emergency stop are focused in a particular way. The proposed
approach defines and guarantees the safety aspects of an automation system controller
related to the emergency stop. For the controller structure the GEMMA methodology is
used; for the controller entire specification the SFC is used and for the controller behaviour
simulation the Automation Studio software (FAMIC, 2003) is used.
<b>Tipo</b>: bookPart2015-09-09T22:12:16ZAn advanced 3D multi-body system model for the human lumbar spineSousa, Amélia Sofia Moreira Neto Mendes deClaro, José Carlos Pimentahttps://hdl.handle.net/1822/346382021-03-29T09:22:31Z2015-03-31T10:14:54ZTítulo: An advanced 3D multi-body system model for the human lumbar spine
Autor: Sousa, Amélia Sofia Moreira Neto Mendes de; Claro, José Carlos Pimenta
Editor: Flores, Paulo; Viadero, Fernando
Resumo: A novel 3D multi-body system model of the human lumbar spine is presented, allowing the dynamic study of the all set but also to access mechanical demands, characteristics and performance under work of the individual intervertebral discs. An advanced FEM analysis was used for the most precise characterization of the disc 6DOF mechanical behavior, in order to build up a tool capable of predicting and assist in the design of disc recovery strategies – namely in the development of replace-ment materials for the degenerated disc nucleus – as well as in the analysis of variations in the me-chanical properties (disorders) at disc level or kinematic structure (e.g. interbody fusion, pedicle fixa-tion, etc.), and its influence in the overall spine dynamics and at motion segments individual level. Preliminary results of the model, at different levels of its development, are presented.
Descrição: Series : Mechanisms and machine science, ISSN 2211-0984, vol. 24
<b>Tipo</b>: conferencePaper2015-03-31T10:14:54ZBiomechanical experimental data curation: an example for main lumbar spine ligaments characterization for a MBS spine modelLourenço, Carina Patrícia AraújoClaro, José Carlos Pimentahttps://hdl.handle.net/1822/346312021-03-29T09:22:30Z2015-03-31T09:19:30ZTítulo: Biomechanical experimental data curation: an example for main lumbar spine ligaments characterization for a MBS spine model
Autor: Lourenço, Carina Patrícia Araújo; Claro, José Carlos Pimenta
Editor: Flores, Paulo; Viadero, Fernando
Resumo: This work overviews an extensive analysis in the context of mechanical characterization of human biomaterials, carried out over a broad set of published experimental data. Focused on main lumbar spine ligaments, several test procedures are exhaustively analyzed, in order to identify possible causes for divergences that have been found in some results. Moreover, guidelines are proposed for da-ta filtering and selection. The main objective of the task was to retrieve trustworthy inputs to a hybrid Finite Element Analysis / Multibody System dynamic simulation model of the human intervertebral disc, which can be used on the prediction of nucleus prosthetics working performance.
Descrição: Series : Mechanisms and machine science, ISSN 2211-0984, vol. 24
<b>Tipo</b>: conferencePaper2015-03-31T09:19:30ZOn the experimental intradiscal pressure measurement techniques : a reviewAraújo, Ângelo Rafael GomesPeixinho, NunoPinho, A. C. Marques deClaro, José Carlos Pimentahttps://hdl.handle.net/1822/346292021-03-29T09:22:31Z2015-03-31T09:03:12ZTítulo: On the experimental intradiscal pressure measurement techniques : a review
Autor: Araújo, Ângelo Rafael Gomes; Peixinho, Nuno; Pinho, A. C. Marques de; Claro, José Carlos Pimenta
Editor: Flores, Paulo; Viadero, Fernando
Resumo: The intradiscal pressure has been essential for prevent the spinal complaints by forming a basis for clinical advice to promote the correct sitting postures. As a consequence, it is evident the need of an accurate method for measure the intradiscal pressure, to better understand the disc response to hydorstatic pressure fluctuations. Numerous reviews regarding disc mechanics are available, including intradiscal pressure benchmarks; however, an analysis on the techniques of intradiscal pressure measurement is needed. Therefore, this review will remain focused on the methodologies adopted for measure the intradiscal pressure in several conditions: for different daily activities, under external loads and for values where occurs annulus fibrosus disruption. The importance of the intradiscal pressure on disc function will be discussed as well as the some guidelines for design new measurement techniques will be defined.
Descrição: Series : Mechanisms and machine science, ISSN 2211-0984, vol. 24
<b>Tipo</b>: conferencePaper2015-03-31T09:03:12Z