Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
THE INFLUENCE OF A NON-CONSTANT INERTIA IN TORSIONAL VIBRATION OF A RECIPROCATING COMPRESSOR
Submission Author:
Nícolas da Silva Dias , DF
Co-Authors:
Nícolas da Silva Dias, Aline Souza de Paula
Presenter: Nícolas da Silva Dias
doi://10.26678/ABCM.COBEM2021.COB2021-1980
Abstract
Torsional vibrations are usually present at some level in rotating machines, as in motors and reciprocating compressors. The majority of works in the literature consider simplified linear models in the dynamical analysis of these systems, which can lead to important errors. This work considers a simplified nonlinear reciprocating compressor shaft model with variable inertia of the rod-crank-piston mechanism. The model, which consists of a compressor with only one cylinder attached to an electric motor, is evaluated in order to analyze the influence of the variable inertia in the dynamical behavior. A parametric analysis is carried out and the results show that the nonlinearities due to non-constant inertia are evident in the torsional vibration response. When considering an additional harmonic excitation, the influence of the nonlinearities is even more important and complex responses can emerge depending on the geometric dimensions and forcing frequency and amplitude of harmonic excitation. The results show the importance of considering the nonlinearities due to the variable inertia of the mechanism.
Keywords
Nonlinearities, torsional vibration, Reciprocating compressor, non-constant inertia
