In this study, an effective method is developed to detect the position of nonlinear components in periodic structures. The detection procedure requires exciting the nonlinear systems only once by using a sinusoidal-like input which has two frequency components. The effectiveness of this method is demonstrated by numerical studies. As the position of a nonlinear component often corresponds to the location of defect in periodic structures, this new method is of great practical significance in fault diagnosis for mechanical and structural systems.
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