Characterization of Small Mistuning in a Rotating Bladed Disk Using Stationary Experimental Modal Analysis
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Date
2020-05
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The Ohio State University
Abstract
Bladed disks are of key importance in jet engines and most power generation facilities for exchanging energy with high pressure, high speed fow. These structures are subject to severe vibration which can cause catastrophic failure, motivating the need for accurate modeling techniques. In order to model this behavior, imperfections in components of the system must be
measured experimentally. The first part of this study introduces a novel method of stationary modal analysis that is signifcantly cheaper and faster than current rotating methods. The second part combines the measured data using the Component Mode Mistuning method (CMM) with a Parametric Reduced Order Model (PROM) to predict full system behavior. This study found a
strong correlation in measured mistuning values between the two experimental methods, validating the new method. Furthermore, the PROM demonstrated strong computational performance and good accuracy across a wide range of operating speeds. These new methods propose a significant opportunity to reduce the dependency on expensive rotating experiments and allow greatly accelerated design validation capabilities.