초록 ▼

A sound insulating lining for a gas flow path, particularly the bypass flow path in a jet engine, is made up of a succession of acoustic panels including a perforated skin bonded to a stiffening frame, and a cellular structure formed by a ribbed skin clamped with prestressing via of resilient tongue

A sound insulating lining for a gas flow path, particularly the bypass flow path in a jet engine, is made up of a succession of acoustic panels including a perforated skin bonded to a stiffening frame, and a cellular structure formed by a ribbed skin clamped with prestressing via of resilient tongues to transverse struts of the stiffening frame so that the ribs engage the perforated skin to form resonant acoustic cavities. The panels forming the lining are screwed to the casing constituting the wall of the flow path to be insulated.

대표청구항 ▼

An acoustic panel for a sound insulating lining to be applied to a wall of a gas flow path, said panel comprising an inner skin provided with a multiplicity of perforations, an elongate stiffening frame bonded to said inner skin, said frame being arcuately curved in a longitudinal direction thereof

An acoustic panel for a sound insulating lining to be applied to a wall of a gas flow path, said panel comprising an inner skin provided with a multiplicity of perforations, an elongate stiffening frame bonded to said inner skin, said frame being arcuately curved in a longitudinal direction thereof and including transverse struts across a width portion of said frame, said struts having thinned portions at predetermined positions thereon, and a cellular structure mounted on said inner skin to define a plurality of resonant acoustic cavities for which said perforations of said inner skin form acoustic vents, said cellular structure comprising a ribbed skin wherein the ribs thereof extend in said longitudinal direction and are arcuately curved with a natural radius of curvature different from that of said inner skin, said ribbed skin having at least one pair of resilient tongues which slip under said thinned portions of said transverse struts of said frame to attach said ribbed skin to said inner skin whereby said ribs engage said inner skin to form said resonant cavities.