Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
ACCURACY ANALYSIS OF MULTIBODY SYSTEMS WITH JOINT CLEARANCE IN FOUR-BAR MECHANISMS
Submission Author:
Rogério Sales Gonçalves , MG , Brazil
Co-Authors:
Rogério Sales Gonçalves, Glênio Ramalho, Fabian Andres Lara-Molina, Marco Ceccarelli
Presenter: Rogério Sales Gonçalves
doi://10.26678/ABCM.COBEM2021.COB2021-0978
Abstract
A multibody system consists on a kinematic chain that is composed of links that can be rigid or flexible, interconnected by joints, in general lower pair such as revolute, prismatic and spherical joints. These joints work properly only if an adequate clearance is ensured. In general, a joint is considered in a design process as ideal i.e., with no clearence in the kinematic pair. When the clearance exists, it can affect the accuracy of the system operation. This paper aims at presenting a numerical approach to obtain the structure displacements that are produced by the stiffness of the structure and the joint clearances. Thus, the joint clearances are included within the model. The compliant displacement of the structure is obtained by a matrix structural analysis (MSA) that considers the compliance of links and joints as is superposed to displacements obtained from joint clearances to obtain the total displacements of the structure. Moreover, the uncertainties of the parameters are modeled as random variables. The compliant displacements in the presence of the uncertainties are obtained by using the Monte Carlo Simulation. The numerical results of simulations are shown for a specific symmetric four-bar linkage as an illustrative example.
Keywords
MULTIBODY SYSTEMS, stiffness, Clearance, Simulation, Uncertainties
