Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Dynamics of a System with Dry-Friction and Electromechanical Coupling
Submission Author:
Roberta Lima , RJ , Brazil
Co-Authors:
Roberta Lima, Rubens Sampaio
Presenter: Roberta Lima
doi://10.26678/ABCM.COBEM2019.COB2019-1671
Abstract
This work analyzes the nonlinear dynamics of a coupled system with dry-friction. The system has a mechanical part and an electromagnetic part. It is composed of a cart, whose motion is excited by a DC motor. The coupling between the motor and the cart is made by a mechanism called scotch yoke, so that the motor rotational motion is transformed in horizontal cart motion in a rail. It is considered the existence of dry-friction between the cart and the rail. The friction is modeled as Coulomb friction. The resulting motion of the motor can be characterized by two qualitatively different and alternate modes, the stick- and slip-modes, with a non-smooth transition between them. The focus of the work is to find the stick- and slip-mode parts of the trajectory for different values of the system parameters.
Keywords
Coupled systems, dry friction, stick-slip oscillations, stick duration
