Vibration and Sound Transmission Performance of Sandwich Panels with Uniform and Gradient Auxetic Double Arrowhead Honeycomb Cores

Table 3

Characteristic parameters of the baseline and optimized models for optimal design from 1000 to 1500 Hz.

Model	Θ2 (deg)	STLa (dB)	f0 (Hz)	STLo (dB)
Baseline	[55.00, 55.00, 55.00, 55.00, 55.00]	45.36	83.72	39.67
Optimized gradient DNPR	[46.71, 47.14, 47.14, 48.31, 51.53]	47.87	83.73	40.16
Optimized gradient INPR	[65.00, 65.00, 55.51, 46.78, 46.25]	50.39	92.91	38.31