34 Modal Test of Six-Meter Hypersonic Inflatable Aerodynamic Decelerator 405 Fig. 34.6 Top view of the accelerometer assembly locations Fig. 34.7 Shaker setup 34.3.1 Predicted vs. Experimental Results Results from the experimental tests and its comparison with the predicted values are tabulated in Table 34.2. It was observed that the percentage difference between the frequencies of the first two modes was less than 4 % but between the third and fourth mode was 33–35 %. Data is currently being analyzed to determine the cause for this difference to obtain an accurate finite element model.
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