Experiment and Simulation Analysis on Noise Attenuation of Al/MF Cylindrical Shells

Table 3

Noise reductions as a function of thickness and surface area coverage.

Order	Noise reductions per unit thickness (dB/10 mm)			Noise reductions per unit area (dB/m^2)
	20 mm	60 mm	100 mm	20 mm	60 mm	100 mm
	3.62	1.48	1.03	1.95	2.39	2.70
	3.49	2.37	1.75	1.88	3.83	4.19
	5.51	3.02	2.24	2.97	4.30	5.02
	3.13	2.94	2.02	2.69	4.01	4.34
	2.38	2.36	1.76	2.04	3.38	3.97
SPL	3.96	1.75	1.18	2.46	2.83	3.19