Lever $—$ Mechanical actuation of a valve

The Lever component describes a mechanical actuation of a valve. This model is based on the PreLoad example (in MapleSim, click the Help menu item, and then select Examples > Physical Domains > 1-D Mechanical).

When designing hydraulic valves, it is often necessary to hold the spool in a certain position as long as an external force is below a threshold value. If this force exceeds the threshold value, a linear relation between the force and the position is desired.

There are designs that need only one spring to accomplish this task. Using the ElastoGap component this design can be easily modeled.

Drawing of spool.

Spool position $s$ as a function of working force $f$.

The input port of this model connects to components from the 1-D Mechanical $\to$ Translational library.

The output of this component is of type Real.

Variables

 Name Value Units Description Modelica ID $\mathrm{InnerContactA}$ InnerContactA $\mathrm{InnerContactB}$ InnerContactB $\mathrm{Spool}$ Spool $\mathrm{FixedLe}$ FixedLe $\mathrm{SpringPlateA}$ SpringPlateA $\mathrm{SpringPlateB}$ SpringPlateB $\mathrm{Spring}$ Spring $\mathrm{OuterContactA}$ OuterContactA $\mathrm{OuterContactB}$ OuterContactB ${\mathrm{Rod}}_{1}$ Rod1 $\mathrm{Friction}$ Friction $\mathrm{Housing}$ Housing ${\mathrm{Rod}}_{3}$ Rod3 ${\mathrm{Rod}}_{4}$ Rod4 ${\mathrm{Rod}}_{2}$ Rod2 ${\mathrm{PositionSensor}}_{1}$ PositionSensor1 ${\mathrm{Limiter}}_{1}$ Limiter1 ${\mathrm{Rod}}_{5}$ Rod5 ${\mathrm{Gain}}_{1}$ Gain1

Connections

 Name Description Modelica ID ${\mathrm{flange}}_{a}$ flange_a $y$ y

Parameters

 Name Default Units Description Modelica ID ${\ell }_{\mathrm{housing}}$ $0.0305$ $m$ Length of housing HousingLength ${s}_{\mathrm{rel0}\left(\mathrm{spring}\right)}$ $0.025$ $m$ s_rel0 of main spring Spring_s_rel0 ${c}_{\mathrm{spring}}$ $2.·{10}^{4}$ Stiffness of main spring spring_c ${\ell }_{\mathrm{Rod1}}$ $0.007$ $m$ Length of rod 1 Rod1_Length ${\ell }_{\mathrm{Rod2}}$ $0.007$ $m$ Length of rod 2 Rod2_Length ${\ell }_{\mathrm{Rod3}}$ $0.00575$ $m$ Length of rod 3 Rod3_Length ${\ell }_{\mathrm{Rod4}}$ $0.00575$ $m$ Length of rod 4 Rod4_Length ${\ell }_{\mathrm{Rod5}}$ $0.0802$ $m$ Offset for position measuring sensor Rod5_Length amplifier gain $160$ Gain of amplifier for position sensor Amplifier_Gain ${u}_{\mathrm{max}}$ $1$ Maximum value of spool position uMax ${u}_{\mathrm{min}}$ $-1$ Minimum value of spool position uMin