Fig. 1

Model of a sandwich plate with the corrugation and auxetic honeycomb mixed core"

Fig. 2

Equivalent model of the corrugation and auxetic honeycomb hybrid core layer"

Fig. 3

Plane sound wave incident on the sandwich plate"

Fig. 4

(a) Present theoretical and COMSOL simulation results of STL. (b) STL convergence (color online)"

Table 1

Natural frequencies of the sandwich plate with the corrugation and auxetic honeycomb hybrid core"

Fig. 5

Vibration modes of the sandwich plate under the excited sound pressure (color online)"

Fig. 6

Vibration modes for the free vibration of the sandwich plate (color online)"

Fig. 7

Effects of the core thicknesses hc on the STL (color online)"

Fig. 8

Effects of the honeycomb wall thicknesses th on the STL (color online)"

Fig. 9

Effects of tc on the STL (color online)"

Fig. 10

Optimized results of the core thickness at multiple frequencies (color online)"

Fig. 11

Optimized results of the aspect ratio (color online)"

Fig. 12

Dual-parameter optimized results of the core thickness-to-aspect ratio (color online)"

Fig. 13

Multi-parameter comprehensive optimized results as η=0.2 (color online)"

Fig. 14

Multi-parameter comprehensive optimization results as η=0.01 (color online)"