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DINAME2019
DINAME2019
Stick-slip oscillations or couple-decouple oscillations?
Submission Author:
Roberta Lima , RJ , Brazil
Co-Authors:
Roberta Lima, Rubens Sampaio
Presenter: Roberta Lima
doi://10.26678/ABCM.DINAME2019.DIN2019-0070
Abstract
This work analyzes the nonlinear dynamics of an electromechanical system with dry-friction. The system is composed of a cart, whose motion is excited by a DC motor. It is a coupled system, the mechanical and the electromagnetic subsystems interact. The coupling between the motor and the cart is made by a mechanism called scotch yoke, so that the motor rotational motion is transformed into horizontal cart motion over a rail. It is considered the existence of dry-friction friction between the cart and the rail. Due to the friction, the resulting motion of the motor can be characterized by two qualitatively different modes, the stick- and slip-modes, with a non-smooth transition between them. The focus of the work is to show that the sequence of stick- and slip-modes can be seen as a sequence of coupled- and decouple-modes between electrical and mechanical parts of the system. Thus, for the system analyzed, stick-slip oscillations could be called as couple-decouple oscillations. Another objective of the work is to find the stick- and slip-mode parts of the trajectory for different values of the system parameters.
Keywords
Electromechanical systems, dry friction, stick-slip oscillations, stick duration
