Determining the Residual Life of Automotive Units Based on Vibroacoustic Analysis

It is noted that in practice, the determination of the residual service life of units is performed either subjectively, or this indicator is not assessed at all due to the lack of necessary methods and means, while a large number of units are written off or sent for labor-intensive repairs with a significant portion of unused service life. The objective of this study was to develop a method for assessing the residual service life of an individual unit using the values of structural parameters associated with the measured diagnostic parameters by vibroacoustic methods, as well as assessing the total residual service life of a group of similar units. Based on the examination of a batch of engines, a method for assessing the residual service life of automotive units is proposed, which includes: the selection of the main structural parameter of the unit under study, a description of the variational series of predicted values of the total service life of individual units with the determination of the probability density of its distribution, the total service life, the probability density of the distribution of the residual service life, and the total residual service life. It has been established that the probability density function of the total service life obeys the Weibull law, while the residual service life obeys the exponential law. It has been shown that the loss of the total service life of units before their decommissioning, write-off, or sending them for labor-intensive repairs amounts to 20–40% on an industry or enterprise scale. The obtained data allows us to provide an economic assessment of the conservation of the remaining service life of operating units. If repair work is scheduled using preliminary diagnostic studies, the range of replaceable parts included in connections whose condition is close to the ultimate limit will be determined.

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