FixedDisplacementPump
Partial Pump
Library
HydraulicsByFluidon/Components/Pumps
Description
Model of a pump with fixed displacement volume and losses.
The main parameters of the pump are its maximum Displacement volume and the Rotational moment of inertia.
The losses are parameterised by providing volumetric and mechanical efficiencies Volumetric efficiency and Mechanical efficiency for a given operating point. The operating point is characterised by a reference pressure difference Reference pressure difference and a corresponding shaft speed Reference speed. Based on the entered values, the parameters of a laminar throttle (volumetric losses) and a linear damper (representing the mechanical losses) are determined automatically. Unlike the efficiencies, the parameters of these two elements typically do not vary significantly with the operating conditions.
The parameter Ratio external Leakage / total Leakage allows to split the leakage between internal and external leakage. A gear pump e. g. typically has no external leakage, Ratio external Leakage / total Leakage has to be set to 0. In contrast, a piston pump has a significant external leakage (0.5 < Ratio external Leakage / total Leakage <= 1).
minSuctionPressure takes into account that a pump requires a minimaum suction pressure for full flow. Below this pressure, the flow rate is reduced. In this model, the reduction is assumed to be simplified as a linear function of suction pressure in relation to minSuctionPressure.
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_dispVolume | dispVolume | Displacement volume | Scalar | |
mo_minSuctionPressure | minSuctionPressure | Pressure limit at suction port below which flow is reduced | Scalar | |
mo_Jrot | Jrot | Rotational moment of inertia | Scalar | |
mo_deadVolume | deadVolume | Dead volume at ports | Scalar | |
mo_nominalVolumeFlow | nominalVolumeFlow | Scalar | ||
mo_volumeFlowLoss | volumeFlowLoss | Scalar | ||
mo_dvisc | dvisc | Scalar | ||
mo_etaVol | etaVol | Volumetric efficiency @ nRef, dpRef | Scalar | |
mo_leakageReferenceDensity | leakageReferenceDensity | Reference density for volumetric efficiency | Scalar | |
mo_ratioLeakageExtern | ratioLeakageExtern | Ratio external Leakage / total Leakage | Scalar | |
mo_useLeakagePort | useLeakagePort | Enable leakage port, otherwise implicitly connected with tank | Number | 0 |
mo_etaHm | etaHm | Mechanical efficiency @ nRef, dpRef | Scalar | |
mo_nRef | nRef | Reference speed (1/min) | Scalar | |
mo_dpRef | dpRef | Reference pressure difference | Scalar | |
mo_pA | pA | pA | Structure | |
mo_pA/fixed | fixed | Cell of scalars | true | |
mo_pA/start | start | Cell of scalars | ||
mo_pB | pB | pB | Structure | |
mo_pB/fixed | fixed | Cell of scalars | true | |
mo_pB/start | start | Cell of scalars |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_stateSelect | stateSelect | Priority to use phi and w as states | Structure | |
mo_stateSelect/choice1 | StateSelect.never | Number | 0 | |
mo_stateSelect/choice2 | StateSelect.avoid | Number | 0 | |
mo_stateSelect/choice3 | StateSelect.default | Number | 0 | |
mo_stateSelect/choice4 | StateSelect.prefer | Number | 0 | |
mo_stateSelect/choice5 | StateSelect.always | Number | 0 |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_forwardFluidProperties | forwardFluidProperties | Forward fluid properties between ports | Scalar | true |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo__nmodifiers | Number of Modifiers | Specifies the number of modifiers | Number | |
mo__modifiers | Modifiers | Add new modifier | Structure | |
mo__modifiers/varname | Variable name | Cell of strings | 'volumeFlowA' | |
mo__modifiers/attribute | Attribute | Cell of strings | 'start' | |
mo__modifiers/value | Value |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
fluidPortA | implicit | Hydraulic port A | input | 1 |
fluidPortB | implicit | Hydraulic port B | input | 2 |
flange_a | implicit | input | 3 | |
flange_b | implicit | output | 1 | |
Port 5 | implicit | Hydraulic port Leakage | input | mo_useLeakagePort |