Pysanets O. Dynamical diagnostics improvement of structurally-heterogeneous details of road-transport means.

The dissertation presents new methods of calculation of dynamic characteristics of strained-deformed state of non-heterogeneous expansible bodies with a complex structure. The following dissertation demonstrates experimental methods of indentor percus-sive pressing used for for determination of the whole complex of mechanical characteris-tics of technologically homogeneous parts. Special programmed provision was developed on its basis to make the calculation of dynamic contact straines more precise during the work of technologically non-homogeneous parts of cylinder-piston groups of internal - combustion engines. There were also worked out some certain numerically - experimental methods of acoustic diagnostics of the quality of over - surface layers of non - homogeneous parts of machines. The method of analysis of non - stationary signals distinguished by their high per-missive capacity to keep enough quantity of frequency permission in the course of time is proposed for consideration in this thesis as well. The analysis is characterized by distinctive particularity to be used independently upon changes of amplitude characteristics of signals. It gives possibility to use this method for control over the first changes on their initial stage. The analysis of frequencies of amplitude maximums of defected and of nondefected piston pins correlation shows that the defect represented as a longitudinal crack can be re-vealed in reducing of frequency not only of natural but constrained vibration as well with-out considerable enery re - distribution among separate parts of vibratory process.