Research Article
Vibration and Sound Transmission Performance of Sandwich Panels with Uniform and Gradient Auxetic Double Arrowhead Honeycomb Cores
Table 1
Series of the natural frequencies of the representative uniform and gradient DAH sandwich models via SEM (Hz).
| | Model | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | 10th |
| | Model 1 | 88.8 | 210.5 | 357.8 | 516.1 | 677.5 | 784.2 | 836.4 | 910.0 | 923.1 | 928.0 | | Model 2 | 86.6 | 210.6 | 364.3 | 532.4 | 706.7 | 856.6 | 881.2 | 1049.6 | 1129.2 | 1153.1 | | Model 3 | 83.7 | 207.3 | 363.5 | 536.9 | 718.7 | 885.3 | 904.1 | 1081.8 | 1255.4 | 1333.3 | | Model 4 | 80.6 | 201.9 | 357.0 | 530.6 | 713.6 | 882.0 | 902.6 | 1080.9 | 1257.4 | 1326.9 | | Model 5 | 77.8 | 194.6 | 342.3 | 503.4 | 581.2 | 615.7 | 666.1 | 667.3 | 719.9 | 816.7 | | Model 6 | 74.4 | 182.5 | 317.9 | 467.5 | 623.9 | 781.5 | 870.3 | 937.1 | 1087.5 | 1179.9 | | Model 7 | 94.5 | 230.2 | 395.0 | 565.8 | 729.2 | 823.6 | 878.1 | 969.4 | 1003.0 | 1023.0 |
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