| 摘要 |
A structural cellular component (12) for a noise attenuation panel (10) comprises walls which provide bounding surfaces for an array of cells (15) and which terminate at opposite faces of the component. The walls forming the cells (15) extend to at least one of the faces of the component at an angle or angles inclined to the normal to that face. The noise attenuation panel (10) is formed from the cellular component (12), a backing component part (11) which extends across the rear face of the cellular component (12) and a facing component (13, 14) which extends across the front face of the cellular component (12). The facing component part (13, 14) comprises or includes an outer facing sheet (14) which is made of a porous permeable thermoplastics material. The panel is intended for use in an aero engine at a surface subjected to the passage across it of gaseous flow and is so positioned that its front face forms the surface subjected to passage of gaseous flow across it. |
