CPC F02C 7/045 (2013.01) [B22F 10/14 (2021.01); B22F 10/18 (2021.01); B22F 10/25 (2021.01); B22F 10/28 (2021.01); B23P 15/008 (2013.01); B28B 1/001 (2013.01); B29C 64/10 (2017.08); B33Y 10/00 (2014.12); B33Y 80/00 (2014.12); B22F 10/12 (2021.01); B29K 2995/0002 (2013.01); B29L 2031/7504 (2013.01); F05D 2220/323 (2013.01); F05D 2230/31 (2013.01); F05D 2230/50 (2013.01); F05D 2240/14 (2013.01); F05D 2260/96 (2013.01); Y10T 29/49323 (2015.01)] | 20 Claims |
1. An acoustic core, comprising:
an array of resonant cells, wherein respective ones of the resonant cells comprise a plurality of cell walls formed of an additive-manufacturing material and a resonant space defined by the plurality of cell walls, and wherein at least some of the resonant cells comprise sound-attenuating protuberances, the sound-attenuating protuberances comprising an excess amount of the additive-manufacturing material having been intentionally introduced to the cell walls and protruding into the resonant space with a semi-random orientation and/or size.
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