Abstract
The acoustic loads to which an aircraft is subjected during its lifetime must be known for structural-fatigue analysis in aircraft design. The Sonic Load History Recorder senses, filters, smooths, and records some measure of the length of time the sound pressure has spent in a given level band. Sound-pressure-level distributions over long periods of time are calculated for a present-day aircraft from engine-operating parameters, operational characteristics of the aircraft, and from ambient atmospheric conditions. The requirements for a device which is designed to provide a useful description of acoustic loads at a point on an operational aircraft are developed on the basis of the SPL histories and fatigue criteria. [This work was supported under U. S. Air Force Contract AF 33(616)-7789.]
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