256 R.A. Perez et al. Fig. 23.8 PSD of PSP data at panel quarter, center, and three-quarter points Fig. 23.9 PSD of panel center point response, DIC vs. ROM Table 23.3 Original and updated damping ratios for case with no shock Mode # Original damping ratio (%) Updated damping ratio (%) (1.1) 0.22 3.4 (1.3) 0.13 0.6 (2.3) 0.10 0.5 vibration on the flow was seen in the PSP data. This could be due to coupling between the structure and acoustics that leads to increased damping in the response. Use of the PSP data obtained from a rigid specimen without the shock impingement led more reasonable modal damping ratios.
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