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A cursory review was made of some of the experimental techniques used for the study of fatigue properties of acoustically excited airframe structures with particular emphasis placed on laboratory equipment and apparatus being used. Discrete-frequency excitation devices are most generally used for much of the test work because of the considerable expense involved in operating the more desirable random-noise sources such as the turbojet engine. Proof testing with an engine facility is still regarded as a necessary step in the ultimate test of structural designs. Careful attention to experimental procedures is of paramount importance; otherwise, considerable error in test data and conclusions can easily occur. Much work remains to be done to improve techniques with the aim of getting better simulation of service environments. This will also involve the development of improved random-noise sources.
Forney, D. M.
Chief, United States Air Force, Davton, Ohio