WOLFRAM SYSTEMMODELER

Hydraulic

Hydraulic library developed by Wolfram MathCore AB

Package Contents

Examples

Package with example models of hydraulic systems

Valves

Package with different types of valves

Cylinders

Package with models of different types of cylinders

PumpsAndMotors

Package with pump and motor models for hydraulic liquids

LiquidContainers

Package with tanks and volumes

Restrictions

Package with laminar and turbulent restriction models

Filters

Package with filter models

Sensors

Package with pressure and flow sensors

Media

Package with media properties

Interfaces

Package with connectors and partial models

Utilities

Package with spools and friction that are used in the other models

Types

Package with Hydraulic specific type specifications

Icons

Package with a collection of icons used in hydraulic components

Information

This hydraulic library contains components for modeling hydraulic systems. Some of the components could be connected to other components in other Modelica libraries. The pumps and motors can be connected to rotational mechanical components from the Modelica Standard Library. The cylinders can be connected to translational mechanical components from the Modelica Standard Library. Many other models, for example the proportional valves, can be connected to blocks from the Modelica Standard Library. The component icons are painted according to the DIN ISO 1219 standard.

Package structure

For a quick overview of the different packages in this library, go to the top.

Most of the components in this library have lumped volumes to make it possible to connect them arbitrarily. They are referred to as dynamic components. A dynamic component is normally built up using static components and volumes. The static components are normally modeled inside the dynamic components since they should not be used outside the component. The added advantage is that a dynamic component can be connected almost arbitrarily. Note however that some combinations and circuits are not physically relevant and should therefore be avoided.

All the static models have a dotted frame to make it easy to identify them. The figures below show the icons for the dynamic and static version of a valve.


The dotted frame is used for the static models

Ports

The connectors in this library are defined in the Interfaces package. The ports have a pressure variable p in [Pa] and a flow variable mdot in [kg/s], defined positive into the component. There are two types of ports in this library, Port_a and Port_b. The only difference between them is the icons.
The connectors

Limitations

No cavitation and temperature effects have been modeled. Bulk modulus is assumed to be constant when fluid compressibility is modeled.

Examples

In the Examples package, there are examples of how to use the components in the library to build hydraulic systems.

References

  • K. Gieck and R. Gieck, Engineering Formulas, 7th ed., Germering, Germany: Gieck Publishing, 1997.
  • C. Nordling and J. Österman, Physics Handbook for Science and Engineering, 7th ed., Lund, Sweden: Studentlitteratur, 2004.
  • W. Borutzky, B. Barnard, and J. Thoma, "An Orifice Flow Model for Laminar and Turbulent Conditions", Simulation Modelling Practice and Theory, 10(3-4), 2002 pp. 141-152. doi: 10.1016/S1569-190 X (02) 00092-8.
  • F. Young, R. Munson, H. Okiishi, and W. Huebsch, A Brief Introduction to Fluid Mechanics, 4th ed., Hoboken, NJ: Wiley, 2007.
  • J. Nikuradse, "Gesetzmässigkeiten der turbulenten Stromung in glatten Rohren", Forschung auf dem Gebiet des Ingenieurwesens A, 4(1), 1933 p. 44. doi: 10.1007/BF02716946.
  • J. Nikuradse, "Strömungsgesetze in rauhen Rohren", in Forschungsheft, Vol. 361, Berlin: VDI Verlag, 1933.
  • Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008.