Slnce the mid-1970s, several studies have investigated the feasibility of using acoustic emission (AE) to monitor the lntegrtty of aircraft structural components durtng flight. These studies are completely catalogued in an annotated bibliography of acoustic emission (1.2). AE has the advantage ofbeing capable ofmonitortng large components with a single sensor, is truly a passive technique, and can be conveniently used in hard-toreach locations. Successful development of this technique will offer tremendous savings by reducing the need for major disassembly in order to inspect crtticalload-bearing components.
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