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Study of the friction-induced vibration and contact mechanics of artificial hip...
Askari, Ehsan; Flores, Paulo; Dabirrahmani, Dane; Appleyard, RichardThe main objective of this work is to study the effect of friction-induced vibration and contact mechanics on the maximum contact pressure and moment of artificial hip implants. For this purpose, a quasi-static analysis and a multibody dynamic approach are considered. It is shown that the multibody dynamic model is effective at predicting contact pressure distribution and moment of hip implants from both accura...
A kriging model for dynamics of mechanical systems with revolute joint clearances
Zhang, Zhenhua; Xu, Liang; Flores, Paulo; Lankarani, H. M.Over the past two decades, extensive work has been conducted on the dynamic effect of joint clearances in multibody mechanical systems. In contrast, little work has been devoted to optimizing the performance of these systems. In this study, the analysis of revolute joint clearance is formulated in terms of a Hertzian-based contact force model. For illustration, the classical slider-crank mechanism with a revolu...
Lançamento de projéteis
Flores, PauloApresentação de apoio à unidade curricular Integradora II do Mestrado Integrado em Engenharia Mecânica ; O presente documento serve de apoio aos alunos da unidade curricular Integradora II no estudo do tema dedicado ao lançamento de projéteis ou trajetórias aéreas.
Study of the effect of contact force model on the dynamic response of mechanica...
Koshy, C. S.; Flores, Paulo; Lankarani, H. M.The main objective of this work is to present a computational and experimental study on the contact forces developed in revolute clearance joints. For this purpose, a well-known slider-crank mechanism with a revolute clearance joint between the connecting rod and slider is utilized. The intra-joint contact forces that generated at this clearance joints are computed by considered several different elastic and di...
The role of poroelasticity on the biomechanics of the intervertebral disc : a f...
Castro, André; Flores, Paulo; Completo, António; Alves, J. L.The major goal for the present work is to evaluate a biomimetic Finite Element (FE) model of the Intervertebral Disc (IVD). Recent studies have emphasized the importance of an accurate biomechanical modeling of the IVD, which is a highly complex biphasic medium. A novel biphasic poroelastic model was implemented and coupled with Wilson’s model (2005) for biphasic osmotic swelling behavior. Numerical tests were ...
Biomechanical models for human gait analyses using inverse dynamics formulation
Moreira, Pedro; Lugrís, Urbano; Cuadrado, Javier; Flores, PauloThe main goal of this work is to present planar biomechanical multibody models, suitable to be used in inverse dynamic analyses. The proposed approach is straightforward and computationally efficient for the study of different human gait scenarios for normal and pathological. For this, a biomechanical model of the lower limb of the human body was developed. The biomechanical model consists of three bodies (thig...
Development of an experimental apparatus to determine impact response of articu...
Alves, Janete; Correia, Pedro Miguel Cerqueira; Peixinho, Nuno; Flores, PauloThe articulations are subject to static and dynamic loads during daily living. Small impact forces can cause damage on articular surfaces as a result of repetitive impact stress. This paper describes a project for a drop tower to allow dynamic impact test in cartilage tissue aiming to understand the mechanics of the cartilage response to impact and seeking to obtain dynamic properties of cartilage, that are rel...
Modeling and analysis of an ankle-foot orthosis (AFO) using multibody methodolo...
Ferreira, Philippe; Flores, F. G.; Flores, Paulo; Siebler, M.; Kecskeméthy, A.Biomechanics is the scientific domain which deals with the study of biological systems, such as the human body, using physical concepts and mechanical engineering methodologies. It allows the development of new medical devices and provides a quantitative analysis of the subject being studied. In the present work, the effect of an ankle foot orthosis (AFO) was studied on a healthy male subject. For this purpose,...
On the development of advanced methodologies to assist on the diagnosis of huma...
Leal, Ana; Silva, Filipe Samuel; Flores, Paulo; Pereira, H.; Mendes, João EspregueiraThe main purpose of this investigation is to present a preliminary study on the development of advanced methodologies to assist on the diagnosis of human articulations pathologies. In this process, a biomechanical approach is considered to characterize the patellofemoral joint. The present research work involves two distinct scientific domains, respectively, engineering and health sciences, and arises as a resu...
A computational approach for cam size optimization of disc cam-follower mechani...
Flores, PauloThe main objective of this work is to present a computational approach for design optimization of disc cam mechanisms with eccentric translating roller followers. For this purpose, the objective function defined here takes into account the three major parameters that influence the final cam size, namely the base circle radius of the cam, the radius of the roller and the offset of the follower. Furthermore, geom...
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