62 G. N. Absi and S. Mahadevan Fig. 6.1 Curved panel dimensions and strain gage locations (units: cm) Fig. 6.2 Temperature distribution in experimental setup (left) and ANSYS model (right) The acoustic load is assumed to be a uniform pressure on the plate surface, with testing magnitudes of 160, 166, 172 and 178 dB. The temperature load follows the experimental setup distribution as seen in Fig. 6.2. A laser beam centered at the center of the panel heats it for temperatures of 120 and 180 ◦F. The experimental setup is simulated using two different models: a high-fidelity time-history analysis, and a low-fidelity power spectral density analysis. Both models have the same mesh size and consider a non-linear stress-strain relationship (material non-linearity). For more details on the models physics, and for discussion regarding the non-linearity of the analysis, please refer to [25]. Two types of damping need to be calibrated: Frictional damping (FD), a type of Coulomb damping resulting from the friction on the boundary of the panel with the experimental setup, and material damping (MD) or Raleigh damping throughout the remainder of the plate. FD and MD are assumed linear functions of the temperature gradient
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