The paper deals with principles of composing the multi-pole models of various hydraulic systems and of computing the transient responses as well as stationary characteristics in the NUT programming environment. The hydraulic system contains a number of functional elements: elements of the flow lines (tubes, local hydraulic resistances and local volume elasticities), elements of mechanical chains (elasticities, masses, dampings), hydraulic pumps, cylinders and motors, directional control valves, pressure and flow valves, proportional valves, servo-valves, etc. The four-pole mathematical models of functional elements may be presented in form G, H, Y or Z, as in electrotechnics, depending on input and output variables. Mathematical models for hydraulic pumps, cylinders and motors are represented as six-pole models. The computing system makes it possible to use the universal hydraulic and mechanical branching element for possible branching as eight-pole models. For computing the static or stationary characteristics the four-pole models of form G, H and Y are suitable. The fluid properties in dependence on pressure at each computing time step are taken into consideration. The NUT system is a programming tool, which supports declarative programming in a high-level language, automatic program synthesis and visual specification of classes. A package for hydraulic system simulation is implemented in the NUT system. Examples for the car front wheel suspension with adaptive damping system and for an electro-hydraulic servo-valve are presented.
Modeling and simulation of hydraulic systems in NUT programming environment
2001
20 Seiten, 15 Bilder, 1 Tabelle, 21 Quellen
Conference paper
English
Computer Modeling and Simulation of Hydraulic Systems
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