Abstract

Turbomachine design is directed at performance, accomplished with blading operating near to aeromechanics stability limits. Currently, linearized friction damper models are used to predict these stability limits. However, during engine development, these linearized solutions are often found to be inadequate. Thus, for accurate blade row stability predictions, the nonlinear effects of friction dampers must be considered. This paper is directed at investigating the effects of friction damper nonlinearities on the response of a linear system and also the applicability of linear and nonlinear aeromechanics analyses. This is accomplished utilizing both linear and nonlinear aeromechanics models to analyze a nonlinear aeromechanics system with only one nonlinearity — friction damping. The linearized friction damper results are shown to be sufficient for preliminary design and for operating conditions away from stability limits. However, nonlinear friction dampers must be considered for final design or optimization near stability limits.

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