Abstract
For nondestructive testing and evaluation of fatigue cracks the acoustical forced oscillation method with nonstationary excitation is used. The testing object model as a nonlinear oscillator is considered. The nonlinear forced oscillations of the testing object model are investigated. The new decision method (‘‘equivalent frequency’’ method) of nonlinear differential equations which describe the object forced oscillations is proposed and investigated. Comparison of the proposed method with the classical decision method is given.
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