25 Experimental Modal Analysis and Operational Deflection Shape Analysis. . . 215 Fig. 25.17 The FRFs at the lower mounting bracket (green), upper mounting bracket (blue), cylinder (red), and cantilever plate (pink) for a hammer impact on the cantilever plate 25.4 Conclusion The purpose of this work was to employ experimental techniques on a cantilever plate by performing EMA and ODS analysis methods in the lab. A CAD model of the experimental setup was first introduced, followed by a simplified model of the fixedfixed cylinder with cantilever plate. The FEM and simulation setup were discussed, including mesh parameters and boundary conditions. Then, the experimental setup in the lab was introduced, including impact hammer and accelerometer equipment as well as the DIC system. The results and analysis using each experimental method were presented and compared to the FEA results. The absolute values of the percent errors between the EMA-based and FEA-based results were less than 5% for each mode’s natural frequency. The MAC between EMA-based modes and FEA-based modes were at least 0.935 on the diagonal for each mode. For the ODS method, the absolute values of the percent errors between the ODS analysis and FEA-based results were less than 11% for each natural frequency. The EMA and ODS analysis results were also compared, and there was less than a 2% difference between each corresponding natural frequency. Finally, a brief discussion on a structure mode at 608.262 Hz involving the cylinder, the upper mounting bracket, and the cantilever plate, and why it was not considered in the analysis results was provided. Acknowledgments The authors would like to thank the Siemens team for their guidance and technical support throughout the completion of this work, including Frank Poradek, Chris Sensor, Peter Schaldenbrand, Scott Beebe, Ramana Kappagantu, and Kin Hong. The authors would also like to thank Micah Simonsen and Alistair Tofts of Correlated Solutions, Inc. for their training and technical assistance with DIC testing. References 1. Wu, J., Shu, C., Zhao, N.: Numerical study of flow control via the interaction between a circular cylinder and a flexible plate. J. Fluids Struct. 49, 594–613 (2014)
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