Experimental Investigations of Damage Identification for Aluminum Foam Sandwich Beams Using Two-Step Method

<table class="table-group" id="tab8"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Case</td><td class="align_center" colspan="3">Modal order</td></tr><tr class="thead"><td class="align_center">1</td><td class="align_center">2</td><td class="align_center">3</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">1.5 times the noise</td><td class="align_center">54.47</td><td class="align_center">377.79</td><td class="align_center">929.93</td></tr><tr><td class="align_left">4 times the noise</td><td class="align_center">55.41</td><td class="align_center">376.95</td><td class="align_center">929.10</td></tr><tr><td class="align_left">9 times the noise</td><td class="align_center">54.38</td><td class="align_center">377.60</td><td class="align_center">929.33</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Natural frequencies under different levels of noise interference (Hz).</div>

Material Design & Processing Communications

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Table 8

Table 8: Experimental Investigations of Damage Identification for Aluminum Foam Sandwich Beams Using Two-Step Method 