FIELD: physics.
SUBSTANCE: acoustic substrate includes essentially open inner and outer lining layers. The inner layer consists of a plurality of open cells that extend between the facing layers. The cells can have multiple configurations, including cells. The facing layers in some embodiments may be non-woven or woven glass canvases. A multi-layered acoustic structure is proposed, which in one non-limiting embodiment consists of two inner layers with outer lining layers and an intermediate layer between the inner layers.
EFFECT: invention provides for the creation of improved acoustic substrates that are lightweight and have a high noise reduction factor.
25 cl, 8 dwg
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