Additive Manufacturing of Silencers with Microperforates

Table 2

Measured impedances of the three MPP-gap options at 3500 Hz compared to optimal value.

	Measured		VA One prediction using theory in [15]
Option	Real Part	Imaginary part	Real Part	Imaginary part
A	1.03	0.73	0.46	0.08
B	0.87	0.048	0.33	0.09
C	0.43	0.18	0.10	0.028
	Optimum according to equation (2) for R=0.0174 m at 3500 Hz
	Real Part		Imaginary part
	0.31		-0.13