Research on extension element model in hydraulic system

After having analyzed hydraulic components and hydraulic systems, this paper presents a method of design hydraulic component and organizing hydraulic system with the matter-element in extension theory. As any hydraulic component contains three performance characteristics: input, output and nature, a hydraulic component can be described as a matter-element. Any hydraulic system is a system which inputs one kind of energy and outputs another kind of energy by interaction between hydraulic components. A hydraulic component is not only one particular type of hydraulic components, but also a part of a hydraulic system, thus this paper creates a matter-element and relation-element model of hydraulic systems, which is consisted of three parts: prototype of hydraulic component, description of hydraulic component with matter-element and relation-element, description of hydraulic system with matter-element and relation-element. Thus, a hydraulic system is organized to an extension element system that has outward input/output needs and contains components with internal function characteristic information. The extension element model in hydraulic system is obtained by integrating performance characteristics, external interface of hydraulic components, and the method of power bond graph. The study of extension element model in hydraulic system can presents a method of describing and storing hydraulic system and a dynamic model of hydraulic system, which has a vital significance for design and automation of hydraulic system.