Patent ID: 7540354
Filing Date: 2009-06-02
Classification: F02C,F02K,F05D,G10K,Y02T,Y10T

Abstract:
1. A method of fabricating a noise attenuating liner comprising the steps of: a) supporting a cellular structure on a support backing; b) covering the cellular structure with a perforated face sheet, where the perforated face sheet includes a plurality of openings for communicating acoustic energy to the cellular structure; d) determining a range of percent open areas of the perforated face sheet based on selected upper and lower limits of a non-linearity factor and a resistance value; e) determining an opening size for each of the plurality of openings based on the selected upper and tower limits of the non-linearity factor and the resistance value that is no greater than ¼ f) generating a design range of percent open areas and hole diameters based on the determined range of percent open area and opening size; and g) forming the plurality of openings within the perforated sheet that includes openings with an opening size and percent open area within the generated design range.