Semi-Markovian models of the process of technical state changes of technical objects

The most important problem of operation of all technical objects (devices) is the problemof rational (optimum) decision control of the process of technical state changes of theobjects. Such control can be realized when a model of the process of technical state chan-ges is applied. In view of this, a formal description of the operational process of technicalobjects was presented in this paper, as well as it was justified that the model of the processmay be a semi-Markovian process of finite set of states. Examples of 4-and 3-state semi--Markovian process were given as a model of the above mentioned process of state chan-ges of any device. Difficulties associated with forming such model, which arise from application of thetheory of semi-Markovian processes, were indicated. Therefore the proposed model is the semi-Markovian process whose values are technical states occurring in the phase of operation of many technical objects ofpractical importance (e.g. combustion piston engines, turbines, displacement and rotary compressors,impeller pumps etc)