The concept of technical condition assessment based on the analysis of the Hilbert spectrum . Detailed description of vibro-acoustic signal processing algorithms and the principle of decision-making about the serviceability of the equipment.

Keywords: Hilbert-Huang transform, empirical modal decomposition, intrinsic mode functions, correlation functions, confidence interval,vibro-acoustic signal, evaluation of technical condition, Fourier transform, wavelet transform, Hilbert spectrum

Developed the method of calculating the informative harmonic of vibroacoustic signals with using finite element modeling software ANSYS. For approbation technique experimental researches were conducted.

Keywords: Shock-acoustic method, local method of free oscillations, composite materials, technical diagnostics, nondestructive inspection, fast Fourier transform, ANSYS, vibroacoustic signals