ACOUSTIC COVERING

摘要

acoustics; ship building, transport, and other industries for reducing noise and vibration levels. SUBSTANCE: acoustic covering has body of highly flexible material in the form of plate with air perforations sealed on external side with structural material layer. Perforations are made in the form of axially symmetrical ducts uniformly arranged on plate area. Sealing layer is made of rubber and has hollows in some portions through its thickness. Diameter of hollows equals 0.1 to 1.0 of sealing layer thickness. Thickness of this layer is between 0.02 and 02 of total thickness of acoustic covering. EFFECT: enhanced acoustic effectiveness and stabilization at low audio frequencies. 2 dwg