Response of Two-Degree-ofFreedom Rotating Machinery System With Quadratic Nonlinearity

A. Ertas, G. Anlas

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A two-degree-of-freedom model of a rotating machine with nonlinear springs of quadratic type is studied. The multiple scales method is used to investigate the nonlinear oscillations of the forced system where the forcing is due to the eccentricity e of the rotor about its center of mass. The behavior of the system for the primary resonances Ω=Ω1, Ω=Ω2 and internal resonance Ω2=21 is analyzed. Other features, such as amplitude jump and saturation phenomenon, have been observed. The amplitudes versus detuning parameters for both cases are plotted. The critical values of mass ratios and spring ratios for the presence of an internal resonance are studied and interpreted for this particular application.

Original languageEnglish
Pages (from-to)103-113
Number of pages11
JournalJournal of Energy Resources Technology, Transactions of the ASME
Issue number2
StatePublished - Jun 1990


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