Project/scholarship details
- Project/scholarship ID
99764
- Reference
PTDC/EME-PME/099764/2008
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
80,000.00 €
- Start date
2010-06-01
- End date
2013-05-31
Documents
On the contact detection for contact-impact analysis in multibody systems
Flores, Paulo; Ambrósio, JorgeOne of the most important and complex parts of the simulation of multibody systems with contact-impact involves the detection of the precise instant of impact. In general, the periods of contact are very small and, therefore, the selection of the time step for the integration of the time derivatives of the state variables plays a crucial role in the dynamics of multibody systems. The conservative approach is to...
A parametric study on the dynamic response of planar multibody systems with mul...
Flores, PauloA general methodology for dynamic modeling and analysis of multibody systems with multiple clearance joints is presented and discussed in this paper. The joint components that constitute a real joint are modeled as colliding bodies, being their behavior influenced by geometric and physical properties of the contacting surfaces. A continuous contact force model, based on the elastic Hertz theory together with a ...
Modeling of the condyle elements within a biomechanical knee model
Ribeiro, Ana Barros; Rasmussen, John; Flores, Paulo; Silva, Luís F.The development of a computational multibody knee model able to capture some of the fundamental properties of the human knee articulation is presented. This desideratum is reached by including the kinetics of the real knee articulation. The research question is whether an accurate modeling of the condyle contact in the knee will lead to reproduction of the complex combination of flexion/extension, abduction/add...
Application of the nonsmooth dynamics approach to model and analyze the contact...
Flores, Paulo; Leine, Remco; Glocker, ChristophThe dynamic modeling and analysis of planar rigid multibody systems that experience contact-impact events is presented and discussed throughout this work. The methodology is based on the nonsmooth dynamics approach, in which the interaction of the colliding bodies is modeled with multiple frictional unilateral constraints. Rigid multibody systems are stated as an equality of measures, which are formulated at th...
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...
Dynamic response of multibody systems with multiple clearance joints
Flores, Paulo; Lankarani, H. M.A general methodology for the dynamic modeling and analysis of planar multibody systems with multiple clearance joints is presented. The inter-connecting bodies that constitute a real physical mechanical joint are modeled as colliding components, whose dynamic behavior is influenced by the geometric, physical and mechanical properties of the contacting surfaces. A continuous contact force model, based on the el...
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...
A multibody approach to the contact dynamics: a knee joint application
Machado, Maria Margarida FernandesIn this thesis, a general approach for dynamic analysis of multibody systems with contact is presented, being a special attention given to the articular contact at the human knee joint. Two methodologies, in two- and three-dimensions, for knee contact modeling are proposed under the framework of multibody systems using generalized Cartesian coordinates. The development of the planar multibody knee model encompa...
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...
A lookup-table-based approach for spatial analysis of contact problems
Machado, Margarida F.; Flores, Paulo; Ambrósio, JorgeThe aim of this work is to present an efficient methodology to deal with general 3D-contact problems. This approach embraces three steps: geometrical definition of 3D-surfaces; detection of the candidate contact points; evaluation of the contact forces. The 3D-contact surfaces are generated and represented by using parametric functions due to their simplicity and ease to handle freeform shapes. This task is car...
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