Regarding the core height, the STL in the whole frequency range basically shows a decreasing trend, and only the 3rd and 4th orders of HP show an increasing trend ( Figure 10 c), which is consistent with Figure 8 a.
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Free vibration and sound transmission properties of beetle elytron plate: structural parametric analysis.
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Secondly, with the increase of skin thickness, the STL basically shows an increasing trend in the whole frequency range ( Figure 10 b).