Abstract:

Sonic fatigue is a phenomenon whereby noise forces structure to vibrate and develop cracks. Many kinds of the typical structural specimens of aircraft are calculated in this paper by use of a quick analysis method. The main characteristics of the method are: Various noise spectrum shapes can be accommodated. Structural response frequency expressions for different structural configurations define the response in the acoustic spectrum and sonic fatigue damage accumulation rate. Unit stress response expressions for different structural configurations define panel stress response for unit loading. A DSR (Detail Sonic Rating) system is used to define structural sonic fatigue quality. The anti-acoustic fatigue design of aircraft structure discussed in the paper.

Key words: sonic fatigue, damage accumulation rate, detail sonic rating, structural re- sponse frequency, sonic fatigue quality