Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

By Paulo Flores, Hamid M. Lankarani. 2010

167 citations recorded by the source corpus.

The dynamic modeling and simulation of spatial rigid-multibody systems with lubricated spherical joints is the main purpose of the present work. This issue is of paramount importance in the analysis and design of realistic multibody mechanical systems undergoing spatial motion. When the spherical clearance joint is modeled as dry contact; i.e., when there is no lubricant between the mechanical elements which constitute the joint, a body-to-body (typically metal-to-metal) contact takes place. The joint reaction forces in this case are evaluated through a Hertzian-based contact law. A hysteretic damping factor is included in the dry contact force model to account for the energy dissipation during the contact process. The presence of a fluid lubricant avoids the direct metal-to-metal contact. In this situation, the squeeze film action, due to the relative approaching motion between the mechanical joint elements, is considered utilizing the lubrication theory associated with the spherical bearings. In both cases, the intra-joint reaction forces are evaluated as functions of the geometrical, kinematical, and physical characteristics of the spherical joint. These forces are then incorporated into a standard formulation of the system’s governing equations of motion as generalized external forces. A spatial four bar mechanism that includes a spherical clearance joint is considered here as an example. The computational simulations are carried out with and without the fluid lubricant, and the results are compared with those obtained when the system is modeled with perfect joints only. From the general results, it is observed that the system’s performance with lubricant effect presents fewer peaks in the kinematic and dynamic outputs, when compared with those from the dry contact joint model.

Subfields: Control and Systems Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/470996aae42d2b2e55ca07ac4a871befc9561934

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In Mechanics of Materials

Citations in the corpus

Application of the nonsmooth dynamics approach to model and analysis of the contact-impact events in cam-follower systems (2012, background): “These effects are due to the nonsmooth characteristics such as clearances, impacts, intermittent contacts, dry friction, or a combination of these effects [15–20].”
Study of the effect of contact force model on the dynamic response of mechanical systems with dry clearance joints: computational and experimental approaches (2013, background): “Introduction The problem of modeling joints with clearance in the context of multibody dynamics has been the subject of many investigations over the last few decades [1-20].”
A comparative study of the viscoelastic constitutive models for frictionless contact interfaces in solids (2015, background): “There is no doubt that contact-impact events are ubiquitous in engineering and research activities, such as in railway dynamics [21-23], crashworthiness [24-26], robotics [27-29], biomechanics [30-32], mechanisms [33-35], and sound waves [36], to mention a few.”
A new model for dry and lubricated cylindrical joints with clearance in spatial flexible multibody systems (2011, background): “ture [21, 22, 26, 39, 77].”