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

[+] Author and Article Information
A. Ertas, G. Anlas

Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409

J. Energy Resour. Technol 112(2), 103-113 (Jun 01, 1990) (11 pages) doi:10.1115/1.2905716 History: Received May 25, 1989; Revised October 05, 1989; Online April 16, 2008


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 = ω 1 , Ω = ω 2 , and internal resonance ω 2 = 2ω 1 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.

Copyright © 1990 by The American Society of Mechanical Engineers
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