Eventos Anais de eventos
DINAME2019
DINAME2019
Dynamics of a parametric N-pendulum with a view on energy harvesting from the motion of a reciprocating oil pumping unit
Submission Author:
Franco Dotti , Buenos Aires , Argentina
Co-Authors:
Franco Dotti, Florencia Reguera, Sebastian Machado
Presenter: Franco Dotti
doi://10.26678/ABCM.DINAME2019.DIN2019-0020
Abstract
The nonlinear dynamics of a parametric pendulum system excited by the motion of a reciprocating oil pumping unit is explored. The final goal of this investigation is to recover energy from such machines by means of pendulum harvesters located on a walking beam. Being the parametric pendulum a potential well system, the study is concentrated in rotational responses which are the most energetic state. A pendulum with multiple concentric masses, i.e. a N-pendulum, is considered in the design. This provides versatility, since it allows the tuning of the natural frequency of the system. The nodding motion provided by the pumping unit is a planar motion, thus containing both vertical and horizontal components. Such feature has a strong influence in the dynamics of the system, as introduces an asymmetry in the governing equation. It is shown that, by virtue of this asymmetry, the pendulum system experiences a complex rotational behavior, very different to the widely studied classic parametric pendulum with a sinusoidal forcing.
Keywords
pendulum, pumpjack, four-bar linkage, energy harvesting, nonlinear dynamics
