Additive Manufacturing of Silencers with Microperforates

<div>Sound pressure distribution in Cremer silencers. Acoustic excitation on the left hand side. Top: local reaction with 6 cavities, each 15 mm long; max. TL 30 dB at 2900 Hz. Bottom: extended reaction with one cavity 90 mm long; max. TL 8.5 dB at 3550 Hz.</div>

Advances in Acoustics and Vibration

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Figure 2

Figure 2: Additive Manufacturing of Silencers with Microperforates 