Abstract
For nondestructive evaluation of fatigue cracks the passive-active low-frequency acoustical method of forced oscillations is used. In the case when natural frequencies of tested details are unknown but natural frequency range is known the use of vibroacoustical nonstationary excitation with variable (in natural frequency range) frequency is proposed. The new model of mentioned excitation is proposed and developed. New analytical expressions of current correlation function and spectral density are received and investigated.
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