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Compliant contact force models in multibody dynamics : evolution of the Hertz c...
Machado, Margarida F.; Moreira, Pedro; Flores, Paulo; Lankarani, H. M.Over the last decades, several compliant contact force models have been proposed. However, no complete and systematic comparison has been done on these models, which provides information on their range of application and accuracy for use in different contact scenarios. Thus, the selection of an appropriate model for a given contact problem is still an important and challenging issue to be addressed. The Hertzia...
The effect of the lubricated revolute joint parameters and hydrodynamic force m...
Machado, Margarida F.; Costa, João; Seabra, Eurico; Flores, PauloIn this work a comprehensive methodology for dynamic modeling and analysis of planar multibody systems with lubricated revolute joints is presented. In general, this type of mechanical systems includes journal-bearings in which the load varies in both magnitude and direction. The fundamental issues associated with the theory of lubrication for dynamically loaded journal-bearings are revisited that allow for the...
On dynamic analysis of contact problems with freeform surfaces : a knee joint 3...
Machado, Margarida F.; Flores, Paulo; Lopes, Daniel S.; Ambrósio, JorgeOne of the biomechanical roles of the knee joint is to withstand high loading forces. Thus, this articulation is quite susceptible to injuries and diseases, which may cause anomalous contact loads, asymmetrical gait patterns and local pain that, ultimately, leads to a knee replacement. In view of that, identifying and quantifying the loads placed on the human knee is critical for understanding realistic joint m...
Development of a planar multi-body model of the human knee joint
Machado, Margarida F.; Flores, Paulo; Claro, José Carlos Pimenta; Ambrósio, Jorge; Silva, Miguel; Completo, António; Lankarani, Hamid M.The aim of this work is to develop a dynamic model for the biological human knee joint. The model is formulated in the framework of multibody systems methodologies, as a system of two bodies, the femur and the tibia. For the purpose of describing the formulation, the relative motion of the tibia with respect to the femur is considered. Due to their higher stiffness compared to that of the articular cartilages, ...
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