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

Table 2

Characteristic parameters of the baseline and optimized models for optimal design at 1400 Hz.

Model	Θ2 (deg)	STLa (dB)	f0 (Hz)	STLo (dB)
Baseline	[55.00, 55.00, 55.00, 55.00, 55.00]	39.37	83.72	39.67
Optimized gradient DNPR	[45.98, 46.53, 46.53, 49.00, 51.03]	49.09	83.99	40.24
Optimized gradient INPR	[64.91, 64.91, 56.90, 54.96, 45.09]	55.61	95.27	37.68