This package contains connectors and partial models for hydraulic components. In particular: HyLibUnits Units for hydraulics library Port_A Layout of port (connector) where oil flows into an element Port_B Layout of port (connector) where oil leaves the element TwoPortComp Superclass of circuits with TWO hydraulic ports (q_in = q_out) TwoPortSys Superclass of circuits with TWO hydraulic ports (q_in <> q_out) OnePortCompInput Superclass of circuits with ONE hydraulic ports OnePortCompInput90 Superclass of circuits with ONE hydraulic port OnePortCompOutput Superclass of circuits with ONE hydraulic ports RotComp Component with two hydraulic ports and two flanges (q_in = q_out) RotSys Component with two hydraulic ports and two flanges (q_in <> q_out) FluidProp Definition of constants describing the fluid Release Notes: -------------- 1999 - 10 - 9: coded
HyLibLight.Interfaces.Port_A
Graphical layout of a port, where oil flows into an element. Release Notes: -------------- 1999 - 10 - 9: coded
connector Port_A "Layout of port where oil flows into an element" Modelica.SIunits.Pressure p "pressure at port"; flow Modelica.SIunits.VolumeFlowRate q "Flow rate through port"; end Port_A;
HyLibLight.Interfaces.Port_B
Graphical layout of a port, where oil leaves the element. Release Notes: -------------- 1999 - 10 - 9: coded
connector Port_B "Hydraulic port where oil leaves the component" Modelica.SIunits.Pressure p "pressure at port"; flow Modelica.SIunits.VolumeFlowRate q "Flow rate through port"; end Port_B;
HyLibLight.Interfaces.TwoPortComp
Superclass of components which have TWO hydraulic ports:
the port A (connector A) and the port B (connector B).
The flow rate at port A is identical to the flow rate at
port B, i. e. there is no storage element in this class.
Across variables:
port_A.p: pressure at the port A in [Pa].
port_B.p: pressure at the port B in [Pa].
Through variables:
port_A.q : Oil flowing from port_A.p to port_B.p in [m^3/s]
(i.e. into the port A and out of the port B).
port_B.q : Oil flowing from port_B.p to port_A.p in [m^3/s]
(i.e. into the port B and out of the port A).
The differential pressure dp is calculated by
dp = port_A.p - port_B.p
if a pressure is less than vapour pressure, the vapour
pressure is used to calculate dp.
Release Notes:
--------------
1999 - 10 - 9: coded
model TwoPortComp "Superclass of circuits with TWO hydraulic ports"
Modelica.SIunits.Pressure dp "Pressure drop";
Modelica.SIunits.VolumeFlowRate q "Flow rate through component";
Modelica.SIunits.Pressure pA_limited;
Modelica.SIunits.Pressure pB_limited;
HyLibLight.Interfaces.Port_A port_A
"Port A, were oil flows into the component (positive q, port_A.p > port_B.p means positive dp)"
;
HyLibLight.Interfaces.Port_B port_B
"Port B, were oil leaves the component (negative q, port_A.p > port_B.p means positive dp)"
;
equation
pA_limited = max(port_A.p, HyLibLight.Interfaces.FluidProp.pvapour);
pB_limited = max(port_B.p, HyLibLight.Interfaces.FluidProp.pvapour);
dp = pA_limited - pB_limited;
q = port_A.q;
port_A.q + port_B.q = 0;
end TwoPortComp;
HyLibLight.Interfaces.TwoPortSys
Superclass of components which have TWO hydraulic ports: the port A (connector A) and the port B (connector B). The flow rate at port A is in general NOT identical to the flow rate at port B, i. e. there is usually a storage element in this class, e. g. a lumped volume at each port. Across variables: port_A.p: pressure at the port A in [Pa]. port_B.p: pressure at the port B in [Pa]. Through variables: port_A.q : Oil entering at A in [m^3/s] port_B.q : Oil entering at B in [m^3/s] The differential pressure dp is calculated by dp = port_A.p - port_B.p if a pressure is less than vapour pressure, the vapour pressure is used to calculate dp. Release Notes: -------------- 1999 - 10 - 9: coded
model TwoPortSys "Superclass of circuits with TWO hydraulic ports"
Modelica.SIunits.Pressure dp "Pressure drop";
HyLibLight.Interfaces.Port_A port_A
"Layout of port where oil flows into an element";
HyLibLight.Interfaces.Port_B port_B
"Hydraulic port where oil leaves the component";
equation
dp = port_A.p - port_B.p;
end TwoPortSys;
HyLibLight.Interfaces.OnePortCompInput
Superclass of components which have ONE hydraulic port: the port A (connector A). Across variables: port_A.p: pressure at the port A in [Pa]. Through variables: port_A.q : Oil flow rate entering the component in [m^3/s] Release Notes: -------------- 1999 - 10 - 9: coded
model OnePortCompInput
"Superclass of circuits with ONE hydraulic ports"
HyLibLight.Interfaces.Port_A port_A
"hydraulic port where oil enters the component";
end OnePortCompInput;
HyLibLight.Interfaces.OnePortCompInput90
Superclass of components which have ONE hydraulic port: the port A (connector A). Across variables: port_A.p: pressure at the port A in [Pa]. Through variables: port_A.q : Oil flow rate entering the component in [m^3/s] Release Notes: -------------- 1999 - 10 - 9: coded
model OnePortCompInput90
"Superclass of circuits with ONE hydraulic port"
HyLibLight.Interfaces.Port_A port_A
"hydraulic port where oil enters the component";
end OnePortCompInput90;
HyLibLight.Interfaces.OnePortCompOutput
Superclass of components which have ONE hydraulic port: the port B (connector B). Across variables: port_B.p: pressure at the port B in [Pa]. Through variables: port_B.q : Oil flow rate leaving the component in [m^3/s] Release Notes: -------------- 1999 - 10 - 9: coded
model OnePortCompOutput
"Superclass of circuits with ONE hydraulic ports"
HyLibLight.Interfaces.Port_B port_B
"Port B, were oil leaves the component (negative q, port_A.p > port_B.p means positive dp)"
;
end OnePortCompOutput;
HyLibLight.Interfaces.RotComp
Superclass of components which have TWO hydraulic ports: the ports A and B and two mechanical flanges. Across variables: port_A.p: pressure at the port A in [Pa]. port_b.B: pressure at the port B in [Pa]. This class is used to model pumps and motors. Release Notes: -------------- 1999 - 10 - 9: coded
model RotComp "Component with two hydraulic ports and two flanges"
replaceable model Prop extends HyLibLight.Interfaces.FluidProp; end Prop;
extends Prop;
Modelica.SIunits.Pressure dp "Pressure drop";
Modelica.SIunits.Pressure pA_limited;
Modelica.SIunits.Pressure pB_limited;
Modelica.SIunits.VolumeFlowRate q "Flow rate through component";
Modelica.SIunits.AngularVelocity w
"Angular velocity of pump shaft";
HyLibLight.Interfaces.Port_A port_A
"Port A, were oil flows into the component (positive q, port_A.p > port_B.p means positive dp)"
;
HyLibLight.Interfaces.Port_B port_B
"Port B, were oil leaves the component (negative q, port_A.p > port_B.p means positive dp)"
;
Modelica.Mechanics.Rotational.Interfaces.Flange_a flange_a;
Modelica.Mechanics.Rotational.Interfaces.Flange_b flange_b;
equation
flange_a.phi = flange_b.phi;
pA_limited = max(port_A.p, pvapour);
pB_limited = max(port_B.p, pvapour);
dp = pA_limited - pB_limited;
q = port_A.q;
port_A.q + port_B.q = 0;
w = der(flange_a.phi);
end RotComp;
HyLibLight.Interfaces.RotSys
Superclass of components which have two mechanical flanges and two hydraulic ports, A and B, but where the entering flow rate is not identical to the leaving flow rate because of internal volumes. Release Notes: -------------- 1999 - 10 - 9: coded
model RotSys "Component with two hydraulic ports and two flanges"
replaceable model Prop extends HyLibLight.Interfaces.FluidProp; end Prop;
extends Prop;
HyLibLight.Interfaces.Port_A port_A
"Port A, were oil flows into the component (positive q, port_A.p > port_B.p means positive dp)"
;
HyLibLight.Interfaces.Port_B port_B
"Port B, were oil leaves the component (negative q, port_A.p > port_B.p means positive dp)"
;
Modelica.Mechanics.Rotational.Interfaces.Flange_a flange_a;
Modelica.Mechanics.Rotational.Interfaces.Flange_b flange_b;
end RotSys;
HyLibLight.Interfaces.HyLibProps
HylibProps defines default parameters that describe the fluid, mineral hydraulic oil: nu kinematic viscosity, default 46.e-6; m^2 / s rho mass density, default 865, kg / m^3 pvapour vapour pressure relative to atmosphere, default -0.999e5 Pa betapmax parameter for Hoffmann's model of pressure dependent bulk modulus pbeta1 parameter for Hoffmann's model of pressure dependent bulk modulus pbeta2 parameter for Hoffmann's model of pressure dependent bulk modulus VolMin minimum value of a lumped volume, default 1e-9 Release Notes: -------------- 2000 - 2 - 13: coded
model HyLibProps
constant Modelica.SIunits.Volume VolMin=1e-9 "minimal volume";
constant Modelica.SIunits.KinematicViscosity nu=46.e-6
"kinematic viscosity";
constant Modelica.SIunits.Density rho=865 "mass density";
constant Modelica.SIunits.Pressure pvapour=-0.999e5
"vapour pressure relative to atmosphere";
constant Modelica.SIunits.BulkModulus betapmax=1.8e9
"bulk modulus at maximum pressure";
constant Real pbeta1=-0.4 "parameter [ ]";
constant Real pbeta2=-2.e-7 "parameter [1/Pa]";
end HyLibProps;
HyLibLight.Interfaces.FluidProp
FluidProp defines parameters that describe the fluid. The default values are given in HyLibProps. nu kinematic viscosity, default 46.e-6; m^2 / s rho mass density, default 865, kg / m^3 pvapour vapour pressure relative to atmosphere, default -0.999e5 Pa betapmax parameter for Hoffmann's model of pressure dependent bulk modulus pbeta1 parameter for Hoffmann's model of pressure dependent bulk modulus pbeta2 parameter for Hoffmann's model of pressure dependent bulk modulus VolMin minimum value of a lumped volume, default 1e-9 To change values define a model MyProps and use the modifier: redeclare model Prop = MyProps for a single component or a complete class, e. g. . Note: If this modifier is used for a single component this information is stored in the *.mo file for that model. If the modifier is used for the library, this information is stored if the library is updated or in the TotalModelFile. Release Notes: -------------- 2000 - 2 - 13: coded
model FluidProp "Definition of constants describing the fluid." replaceable model DefaultProps extends HyLibProps; end DefaultProps; extends DefaultProps; end FluidProp;
HyLibLight.Interfaces.RotComp.Prop
replaceable model Prop extends HyLibLight.Interfaces.FluidProp;end Prop;
HyLibLight.Interfaces.RotSys.Prop
replaceable model Prop extends HyLibLight.Interfaces.FluidProp;end Prop;
HyLibLight.Interfaces.FluidProp.DefaultProps
replaceable model DefaultProps extends HyLibProps;end DefaultProps;