Finite Element Analysis on Acoustic and Mechanical Performance of Flexible Perforated Honeycomb-Corrugation Hybrid Sandwich Panel

Table 1

Geometry parameters.

Name	Value	Unit	Meanings
b1	3.6	mm	The side length of the air cavity in the honeycomb
b2	3.8	mm	The side length of the honeycomb structure
t1	1.0	mm	The thickness of MPPs in top and bottom panels
t2	1.0	mm	The thickness of the corrugations
tw	0.4	mm	The thickness of the cavity
tc	4.0	mm	The thickness of the incident air
d1	1.0	mm	The diameter of the perforation in MPPs
d2	1.0	mm	The diameter of the perforation in the corrugation
H	20	mm	Height of the honeycomb
h	1.0	mm	Height of the bottom panels
c0	343	m/s	Sound speed in air
ρ0	1.213	kg/m^3	The density of the air