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Template: TwoPortComponentSignalInput

The TwoPortComponentSignalInput template is a partial model of a two-port hydraulic component with a signal input.  The two hydraulic ports are A and B, the dimensionless signal input is u. A typical use for this template is to create a varying restriction, with the restriction set by the input signal.

There is no storage element in this class, that is, the mass flow into port A equals the mass flow out of port B.

The pressure differential across the component, Δp, is typically pApB, but if either pressure is less than the vapour pressure of the oil, then the vapour pressure is used to compute Δp.

Variables

Name

Value

Units

Description

Modelica ID

pA

 

Pa

pressure at port A

port_A.p

pB

 

Pa

pressure at port B

port_B.p

pAabs

pA+poilatm

Pa

absolute pressure at port A

pA_abs

pBabs

pB+poilatm

Pa

absolute pressure at port B

pB_abs

pAlim

maxpA,poilvapourpoilatm

Pa

limited gauge pressure at port A

pA_limited

pBlim

maxpB,poilvapourpoilatm

Pa

limited gauge pressure at port B

pB_limited

pAsum

pA

Pa

pressure at port A

summary_pA

pBsum

pB

Pa

pressure at port B

summary_pB

Δp

pAlimpBlim

Pa

pressure differential

dp

psat

oil.gasSaturationPressureT,oil.v_gas

Pa

gas saturation pressure

p_sat

mflowA

 

kgs

mass flow rate at port A; positive if oil is entering the component.

port_A.m_flow

mflowB

mflowA

kgs

mass flow rate at port B; positive if oil is entering the component.

port_B.m_flow

HPsum

Δpq

W

hydraulic power

summary_HP

q

mflowAρ

m3s

volume flow rate into port A

q

qsum

q

m3s

volume flow rate into port A

summary_q

ρ

ρΔp,pAabs,pBabs,T,oil

kgm3

upstream density of oil

rho

ν

νΔp,pAabs,pBabs,T,oil

m2s

upstream kinematic viscosity of oil

nu

T

Toil0+ΔTsystem

K

local temperature of oil

T

Parameters

Name

Default

Units

Description

Modelica ID

ΔTsystem

0

K

temperature offset from system temperature

dT_system

Assumptions

No storage of energy or mass in the component.

Sign Conventions

If the pressure at port A is greater than the pressure at port B, the volume flow rate at port A is positive.


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