Theory and computation of the reference dependence and residual service life of a machine

The diagnostic parameter-time dependence, usually used for prediction of the residual service time, is given here its theoretical grounding. The relationships involved are derived on the basis of the machine's heat balance for two time approaches-short-term (starting time) and-long-term (service time). The diagnostic parameter considered is the temperature change rate during the running-in period of the machine. The reference dependence obtained from theoretical values of the diagnostic parameter is compared against its counterpart by the traditional empirical method. The residual service life calculated by these two approaches is also analyzed. It is shown that the theoretical consideration is valid and can be applied in reliable machine diagnostics.