Structural Fatigue under Combined Sinusoidal and Random Vibration

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Abstract
Structural fatigue caused by combined sinusoidal and random vibration is of concern in flight proofing of electronic equipment, since such excitation is required by many current ballistic missile equipment specifications. How to predict the fatigue under this vibratory excitation is discussed with particular reference to the relationship of combined vibration to a single sinusoidal substitute. Equations and curves for obtaining the sinusoidal substitute are presented and their application illustrated on a single resonator system.

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