Abstract
Various malfunctions may occur during the car operation. These include automatic gearbox malfunctions which reveal themselves during operation in the form of a rigid (jerky, bumpy) untimely engaging the up or down gear in an automatic gearbox. The quality criteria for automatic gearbox shifting which currently exist do not allow to give a reliable assessment of the required gear selection. In such cases, people operating the car often ask questions about the technical condition of the automatic gearbox and the quality of gear shift. The authors have studied the process of gear shifting, smoothness of it and peculiarities of automatic gearbox functioning of during car operation. The article describes the urgency of the problem of jerks and vibrations when changing gears. When assessing the smoothness of gear shifting, the method of technical state vibroacoustic diagnostics is applied. The method is based on the recorded parameters of vibration velocity, vibration acceleration, vibration movement with their further conversion (fast Fourier transform) into a spectral signal. The procedure of longitudinal vibration acceleration measurements on cars in operation is described. Comparative analysis of automatic gear change smoothness. As a result of the analysis the quantitative characteristics of different smoothness gear changes are obtained and its comparison with the permissible level is given. According to the results of the parameters registration and their comparative analysis, it was suggested that it is possible to assess the quality of the gear shift and determine the quantitative indicators of smoothness. Keywords: iron ore raw materials, quarry transport, process
Published Version
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