MapleSim Hydraulics Library from Modelon
Two Orifices — Two orifices in series, one with variable the other with fixed flow area
The Two Orifices component describes two orifices that are connected in series without a lumped volume between them. This component can help to avoid a stiff system if the lumped volume between the two orifices is very small and its time constant negligible compared with the system dynamics. The mathematical models are taken from Metering Ori and Orifice. The diameter of the variable orifice is given by the value at the signal connector as commandedDiameter m and the diameter of the fixed orifice is set with the d parameter (found under the Properties tab (
) in the Parameters section). The mass and flow forces are not included.
Lam Res No States
Resistance with laminar flow.
Var Lam Res No States
Resistance with laminar flow and externally commanded conductance.
Orifice No States
The component, based on the loss coefficient K, describes both flow regimes: laminar for very small Reynolds numbers and turbulent for higher Reynolds numbers (default model).
Ori Poly No States
The component describes both flow regimes, using an interpolation polynomial.
Ori Cav No States
Orifice component checking for cavitation.
Sim Ori No States
Simple textbook component, using a constant discharge coefficient. It is valid for turbulent flow only; severe numerical problems for laminar flow.
Metering Ori No States
Metering Orifice (that is, model Orifice No States with variable diameter).
Same as Orifice No States, but with the equations rearranged to compute dp for given q.
Differences between basic models are shown by a figure.
Flow rate flowing into port_A
Limited gauge pressure
Upstream kinematic viscosity
Absolute pressure pA
Absolute pressure pB
Pressure at port A
Pressure at port B
Gas saturation pressure
Layout of port where oil flows into an element (0<mflow, pB<pA means 0<Δp)
Hydraulic port where oil leaves the component (mflow<0, pB<pA means 0<Δp)
Temperature offset from system temperature
Diameter of fixed orifice
Laminar part of fixed orifice model
Turbulent part fixed orifice, k2=1Cd2
Laminar part of variable orifice model
Turbulent part variable orifice, k2=1Cd2
Initial pressure between Orifices
MapleSim Hydraulics Library from Modelon Overview
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