Análise do comportamento dinâmico de eixos de material composto em máquinas rotativas

Abstract

Various applications of composite materials have been prominent in recent years, given their many advantages over the equivalent conventional engineering materials counterparts. Following this tendency, researches on the dynamics of rotating machine are demonstrated interesting in replace metallic by composite shafts, resulting in greater operation speeds, lower overall weight, and optimal structural efficiency, among other aspects. In this sense, some models have been proposed for the computational modeling of rotating machines with composite shafts. A comparison between simplified beam models for composite shafts is presented in this contribution. Also, a detailed experimental analyses and validation of the implemented models is carried out in terms of the frequency response functions for the free-free condition of the system. Regarding the studied rotating machine, the critical speeds, vibration amplitudes, transient motion, and instability thresholds were numerically determined. The obtained results demonstrated the advantages in applying shafts of composite material in rotating machines, as well as the need for more detailed investigations about the analyzed system.