Análise dinâmica de rolamentos de esfera / Dynamic analysis of ball bearing
AUTOR(ES)
Rafael Vischi Carvalho
FONTE
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
13/08/2010
RESUMO
Ball bearings are simple machine elements but largely used in several applications involving high velocities, high temperatures and different loads. The load model is fundamental for the ball bearing s dynamic and for this reason it is necessary to define with accuracy the mechanisms performance using analytical methods. The objective of this thesis is to analyze the ball bearings using, firstly, the most relevant books and papers from several authors as reference and then initiate the modeling and simulation to analyze the influences from the gyroscopic moment and from the velocities created due to the bearing s components and also to the load. Based on a basic bearing, a numeric simulation s test methodology was applied modifying the main critical factors from the bearing and considering the kinematical, dynamical and statical behaviors. The conclusion is that the rotation and the contact angle have influence at the friction forces that resist to the gyroscopic moment and to the velocities that are created at the contact zones between balls and inner and outer raceways. Under high rotations, as higher its value is, higher is the influence at the precession and nutation angles, causing sliding. It was also verified the nutation angle in which the normal velocity at contact is zero, validating the outer raceway control. The model presented itself very consistent with the approximation for the velocities and accelerations presented at rolling element, factors that are highly related to the lubrication condition from the ball bearings
ASSUNTO(S)
rolamentos de esfera dinâmica cinemática mecânica do contato ball bearings dynamic kinematics mechanical contact
