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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...


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...


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...


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...


Formulation for planar multibody dynamics

Flores, Paulo; Lankarani, H. M.


Lubricated revolute joints in rigid multibody systems

Flores, Paulo; Ambrósio, Jorge; Claro, José Carlos Pimenta; Lankarani, H. M.; Koshy, C. S.

The main purpose of this work is to present a general methodology for modeling lubricated revolute joints in constrained rigid multibody systems. In the dynamic analysis of journal-bearings, the hydrodynamic forces, which include both squeeze and wedge effects, generated by the lubricant fluid, oppose the journal motion. The hydrodynamic forces are obtained by integrating the pressure distribution evaluated wit...


Translational joints with clearance in rigid multibody systems

Flores, Paulo; Ambrósio, Jorge; Claro, José Carlos Pimenta; Lankarani, H. M.

A computational methodology for dynamic description of rigid multibody systems with translational clearance joints is presented and discussed in this work. Over the last years, extensive work has been done to study the dynamic effect of the revolute joints with clearance in multibody systems, in contrast with the little work devoted to model translational joints with clearance. In a joint with translation clear...


Dynamic behaviour of planar rigid multi-body systems including revolute joints ...

Flores, Paulo; Ambrósio, Jorge; Claro, José Carlos Pimenta; Lankarani, H. M.

This paper deals with a general methodology to assess the influence of the clearance size and the friction coefficient on the dynamic response of planar rigid multi-body systems including revolute joints with clearance. When there is a clearance in a revolute joint, impacts between the journal and the bearing can occur, and consequently, local deformations take place. The impact is internal and the response of ...


A study on dynamics of mechanical systems including joints with clearance and l...

Flores, Paulo; Ambrósio, Jorge; Claro, José Carlos Pimenta; Lankarani, H. M.; Koshy, C. S.

In this work a methodology for the dynamical analysis of mechanical systems considering realistic joint characteristics, namely, joints with clearance and lubrication is presented. For the case of the joints with clearance modelled as a contact pair with dry contact, a technique using a continuous approach for the evaluation of the contact force is applied, in which the energy dissipation in form of hysteresis ...


Influence of the contact–impact force model on the dynamic response of multi-bo...

Flores, Paulo; Ambrósio, Jorge; Claro, José Carlos Pimenta; Lankarani, H. M.

This work deals with contact–impact force models for both spherical and cylindrical contact surfaces. The incorporation of the friction phenomenon, based on the Coulomb friction law, is also discussed together with an effective computational strategy, which includes the automatic step size selection procedure. Impacts within a revolute clearance joint in a basic slider–crank mechanism are used as an example to ...


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Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia