Abstract
The work is devoted to the experimental studies of determining the magnitude of the electromotive force (EMF) that arises in the friction pairs of an internal combustion engine (ICE) and the possibility to assess its technical condition by the magnitude of the electromotive force. A research procedure was designed to carry out an experiment. The measurement of small value voltages was carried out using a control and measuring device, the principle of operation of which is based on operational amplifiers (OA). Based on the previously obtained theoretical values of the EMF, the designed millivoltmeter can make measurements in the range of the following values: from 50 μV to 1 mV and from 1 mV to 40 mV. To ensure the reliability of the readings of the measuring device, its calibration was carried out with the use of an AMPROBE 37XR-A digital multimeter. As a result of the measurements, the relationship between the EMF value and the crankshaft speed of the power plant was established. The analysis of the research results confirms the possibility of diagnostic assessment of the power machine condition by the values of the measured EMF using the proposed measuring complex.
Highlights
IntroductionDuring the operation of power machines of cars and tractors, one of the factors causing a decrease in the resource and work efficiency is a change in the parameters of the rubbing surfaces of units and coupled parts up to the peak value
During the operation of power machines of cars and tractors, one of the factors causing a decrease in the resource and work efficiency is a change in the parameters of the rubbing surfaces of units and coupled parts up to the peak value.The change in the geometric parameters of the contacting surfaces and the physicochemical properties of the materials from which they are made occurs for many reasons
The test model of the power machine includes the sources of the electromotive force (EMF) of all its friction pairs formed by different metals
Summary
During the operation of power machines of cars and tractors, one of the factors causing a decrease in the resource and work efficiency is a change in the parameters of the rubbing surfaces of units and coupled parts up to the peak value. One of the essential reasons is the process of crushing and the subsequent separation of the upper metal layer from the surface under the influence of compressive forces and the relative speeds of movement of one surface relative to the other. The third group includes the least studied process of wear under the influence of electric currents of various magnitudes arising from the friction of various units and rubbing parts in the machine. This will entail a change in the antiwear properties of materials, and, affect the service life of individual friction pairs, but the entire engine as a whole [1-3]
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