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Abstract Gas turbine engine companies often employ home-grown or internally developed computer programs for rotor dynamics design-analysis. Developing, and maturing these sometimes over decades to support day-to-day design execution and some of the more specialized problems in Rotor Dynamics. As some problems now require higher fidelity modeling or visualization, along with the incorporation of more physics-based capabilities, the employment of commercially available, general use software becomes attractive to predict general engine dynamic behavior with these additional features. These are found to be important in predicting rotor dynamic system behavior accurately. Three case studies are presented in this paper, namely (1) squeeze film dampers with inertia terms in addition to conventional stiffness and damping, (2) speed/thrust dependent bearing stiffness in transient analysis and (3) the explanation of side-banding in the response utilizing transient analysis solutions. The approach described in this paper seeks to make use of already proven general finite-element nonlinear analysis (transient and harmonic analyses) which are available in the market. This process of integration will allow us to include system nonlinearities (particularly at the damper for case #1 and bearings stiffness for case # 2 and 3) appears to be necessary if analytical predictions are to be realistic. The work is applied to Nelson-McVaugh model to validate for squeeze file damper element for harmonic analysis and other two cases for transient analysis. This paper will be useful for the end user for implementing and enhancing the capability in house as well as commercial software where user defined element is possible.
Mathuria et al. (Mon,) studied this question.
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