FIELD: aircraft, ship construction and other industries, particularly laminated sound-absorbing panels provided with light-weight filler of corrugated sheet material.
SUBSTANCE: sound-absorbing panel comprises upper and lower coverings and zigzag filler arranged in-between. The coverings and filler are formed of composite material including phenol binding agent and fabric filler. Binding material content in upper covering is 5-20% by weight and in lower covering is 30-50% by weight. Zigzag filler includes Z-shaped corrugations with teeth inclined at 40-50° angles to sound propagation direction.
EFFECT: increased sound absorption in wide frequency range and decreased labor inputs for panel production.
2 cl, 1 tbl, 1 dwg
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