| 摘要 |
PCT No. PCT/GB92/00119 Sec. 371 Date Apr. 13, 1993 Sec. 102(e) Date Apr. 13, 1993 PCT Filed Jan. 21, 1992 PCT Pub. No. WO92/12855 PCT Pub. Date Aug. 6, 1992.A noise attenuation panel 10 for an aero engine environment comprises a first cellular component part 121 which has wall portions which extend from the front face to the rear face and which provide bounding surfaces for an array of cells 15 and a second cellular component part 122 in the form of an open-celled structure having a multiplicity of the intercommunicating cells obtained by aggregation of particulate material or by the displacement of material by a dispersion or like technique. A backing component part 11 is secured to the rear face of the second cellular component part 121, the front face of which is secured to the rear face of the first cellular component part and a facing component part 14 is secured to the front face of the first cellular component part. In an alternative form, the positions of the cellular component parts 121, 122 are interchanged. |
