WOLFRAM SYSTEM MODELER

DCVM43FloatingCenter

Mechanically actuated proportional valve with four ports and three states

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Valves.DirectionalControl.MechanicalActuation.DCVM43FloatingCenter"]
Out[1]:=

Information

This is a model of a control valve with four ports and three states. The valve has a tank port t, a pressure port p, and two load ports a and b. The insignal, u, to the spool is the force on the mechanical flange. The valve is controlled by a mechanical spool with dynamics; see SpoolM.

This valve is similar to DCVM43ClosedCenter; the only difference is the middle state. In this model, ports T-A-B are connected in the middle state. In the figure below, u is the force.
Control valve with four ports and three states

Implementation

This valve basically consists of orifices controlled by a spool.

Parameters (10)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

V

Value: 0.0001

Type: Volume (m³)

Description: Volume of control valve

Gleak

Value: 1e-020

Type: PressureDependentLeakage (m³/(s⋅Pa))

Description: Leakage between orifices

overlap

Value: 0

Type: Length (m)

Description: Spool overlap, a number between -1 and 1; 0 if no overlap

AMax

Value: 0.001

Type: Area (m²)

Description: Maximum opening area

Cd

Value: 0.62

Type: Real

Description: Coefficient of discharge for the opening

L

Value: 2

Type: Length (m)

Description: Valve length

x0

Value: -1

Type: Position (m)

Description: Minimum valve position

f

Value: 80

Type: Frequency (Hz)

Description: Spool resonance frequency

d

Value: 0.9

Type: Damping (s⁻¹)

Description: Spool damping

Connectors (5)

port_p

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

port_t

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

port_b

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

port_a

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

flange

Type: Flange_a

Description: One-dimensional translational flange (left, flange axis directed INTO cut plane)

Components (12)

medium

Type: Medium

Description: Medium in the component

volume_a

Type: Volume

Description: Fixed volume with fluid storage

volume_b

Type: Volume

Description: Fixed volume with fluid storage

volume_t

Type: Volume

Description: Fixed volume with fluid storage

volume_p

Type: Volume

Description: Fixed volume with fluid storage

rightState

Type: CrossOver4Port

Description: Basic building block for directional control valves

leftState

Type: Straight4Port

Description: Basic building block for directional control valves

middleState

Type: Floating4Port

Description: Basic building block for directional control valves

abs1

Type: Abs

Description: Output the absolute value of the input

add1

Type: Add

Description: Output the sum of the two inputs

const

Type: Constant

Description: Generate constant signal of type Real

spoolWM

Type: SpoolM

Description: Model of a mechanic spool