MODERN ASPECTS OF MODELLING THE DYNAMIC BEHAVIOR OF HYDRAULIC POSITIVE DISPLACEMENT UNITS AND SYSTEMS PART I. GENERAL MODELLING APPROACH

This report reviews in general results obtained by the author during his long scientific research experience in the field of hydraulic power drive systems and control systems with marine application. With modelling the static and dynamic of the operational processes, the thermal effects are observed by taking into account the working liquid condition. The non-isothermal approach is proved to be of great importance for the proper exploitation and maintenance of the system and its elements. The author submits a patentprotected hydraulic unit, which is experimentally examined and provides a theoretical base for the implementation of frequency controlled hydraulic drives. This kind of hydraulic drives is modern and perspective alternative of the classic hydraulic drives, which incorporate a variable displacement units.