Perforated skin for acoustic unit, has perforations arranged in form of equilateral triangle without interrupting fibers of respective plys that are disposed such that fibers are parallel to respective sides of triangle

摘要

The skin has perforations (P1-P3) that are arranged in the form of an equilateral triangle without interrupting fibers (F1-F3) of respective plys (N1-N3). The plys are disposed such that the fibers are parallel to respective sides of the triangle. The perforations have a diameter of 1.55 millimeter, and the sides of the triangle have a length of 2.53 millimeter. The perforations occupy 30 to 40 percent of the skin. Independent claims are also included for the following: (A) an acoustic unit comprising a perforated skin (B) a skin fabrication method.