Abstract
The method of thermal diagnostics of friction (TDF) has been developed in detail for radial sliding bearings with rotary motion of the shaft, which makes it possible to determine the friction force from temperature data.The possibility of determining the frictional moment by measuring the temperature is theoretically shown in the case of the swinging motion of the shaft using a two-dimensional mathematical model of the thermal process. The use of a two-dimensional model limits the use of the TDF method for solving practical problems. In this paper a three-dimensional model of the thermal process is proposed, taking into account the rotating speed of the shaft for a sliding bearing operating in a reciprocating-rotational mode. Taking into account the speed of the shaft movement leads to a significant increase in the calculation time, which is not always desirable for TDF based on solving the inverse problem of heat transfer. Determining the conditions under which it is possible to disregard the speed of the shaft in the thermal process model is an urgent problem. The method for determining the kinematic conditions for accounting for the speed of the shaft in the mathematical model of the thermal process is proposed on the basis of a numerical analysis of the unsteady three-dimensional temperature field in a radial self-lubricating sliding bearing. The results obtained can be used for TDF in real sliding bearings.
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