modelServovalve
Servo valve built from bond graph technology
Information
The servo valve model described here has a signal input, the position of the tongue, x, and two bondgraphic outputs: the two load flows, qL1 and qL2. The bondgraphic interface is designed such that the servo valve can be directly connected to the hydraulic motor without either a set of bonds or a set of junctions in between.The two chambers of the servo valve are at the pressures p1 and p2, respectively.
The four valve flows, q1, q2, q3, and q4, are assumed to be turbulent flows. The valve flows are modulated by the tongue position. The modulation of the four hydraulic conductors representing the turbulent flows is computed by the Modulator block.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.SIunits.VolumeFlowRate | k | 1 | Hydraulic valve flow constant |
| Real | x0 | 0 | Percentage of mechanical valve underlap |
| Modelica.SIunits.Pressure | ps | 1 | System pressure |
| Modelica.SIunits.Pressure | p0 | 0 | Environmental pressure |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | x | ||
| Interfaces.BondCon | BondCon1 | ||
| Interfaces.BondCon | BondCon2 |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modulator | M1 | ||
| Bonds.eBond | B6 | ||
| Junctions.J0p3 | J0p3_1 | ||
| Bonds.eBond | B2 | ||
| Junctions.J1p3 | J1p3_1 | ||
| Bonds.fBond | B3 | ||
| Junctions.J0p3 | J0p3_2 | ||
| Bonds.fBond | B4 | ||
| Junctions.J1p3 | J1p3_2 | ||
| Bonds.eBond | B5 | ||
| Bonds.fBond | B1 | ||
| Junctions.J0p3 | J0p3_3 | ||
| Bonds.fBond | B7 | ||
| Bonds.fBond | B8 | ||
| Bonds.fBond | B9 | ||
| Sources.Se | PS | ||
| Passive.HydromG | mG1 | ||
| Passive.HydromG | mG4 | ||
| Bonds.fBond | B15 | ||
| Junctions.J1p3 | J1p3_3 | ||
| Bonds.fBond | B12 | ||
| Passive.HydromG | mG2 | ||
| Bonds.eBond | B11 | ||
| Junctions.J0p3 | J0p3_4 | ||
| Bonds.eBond | B10 | ||
| Sources.Se | P0 | ||
| Bonds.eBond | B13 | ||
| Junctions.J1p3 | J1p3_4 | ||
| Bonds.fBond | B14 | ||
| Passive.HydromG | mG3 | ||
| Bonds.fBond | B16 |