23 Nonlinear Dynamic Response Prediction of a Thin Panel in a Multi-Discipline Environment: Part II—Numerical Predictions 255 Fig. 23.6 PSD of panel center point response and displacement operational deflected shapes Fig. 23.7 PSD of panel center point response, DIC vs. ROM 23.5 Summary The results from a modeling effort of the dynamic response of a compliant panel in a supersonic wind tunnel were presented. The aero-induced loading was obtained from PSP data measured during the wind tunnel test. The response of the panel was computed using a ROM that includes geometric nonlinear effects and the ROM predictions were compared against data measured using DIC. The case considered consisted of turbulent flow over a compliant panel with no shock impingement. The response for this case was seen to be in the nonlinear regime, but the shift in the natural frequency of some of the peaks was considered to be too large to be attributed to the geometric nonlinear stiffening due to the vibration of the panel. Computation of the ODS revealed that the three peaks in the PSD of the response that shifted to higher frequencies were dominated by modes 3, 8, and 12, respectively. Modification of the linear stiffness terms corresponding to these modes led to an improvement in the ROM predicted response. Increasing the modal damping led to an excellent matching of the test data. The effect of the panel
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