Developing a Reduced Order Model of Nonsynchronous Vibration in Turbomachinery Using Proper Orthogonal Decomposition Methods

Abstract

The paper develops a reducedorder model of nonsynchronous vibration (NSV) using proper orthogonal decomposition (POD) methods. The approach was successfully developed and implemented, requiring between two and six POD modes to accurately predict computational fluid dynamics (CFD) solutions that are experiencing NSV. This POD method was first developed and demonstrated for a transversely moving, twodimensional cylinder in crossflow. Later, the method was used for the prediction of CFD solutions for a twodimensional compressor blade. This research is the first to offer a POD approach to the reducedorder modeling of NSV in turbomachinery. Modeling NSV is especially challenging because NSV is caused by complicated, unsteady flow dynamics; this initial study helps researchers understand the causes of NSV, and aids in the future development of predictive tools for aeromechanical design engineers.