Simscape fluids error cylinder area parametrization

Hello i am a university student and i am trying to build a hydraulic system for a crane miniature. My hydraulic system has the my defined values but i am getting the error:

Error:An error occurred during simulation and the simulation was terminated

Caused by:

['test_hydraulics/Solver Configuration1']: At time 0.498629, one or more assertions are triggered. See causes for specific information.

Liquid volume must be greater than minimum physical volume. The assertion comes from:

Block path: test_hydraulics/Double-Acting Actuator (IL)1

Assert location:

o In between line: 242, column: 5 and line: 242, column: 11 in file: foundation.isothermal_liquid.elements.translational_mechanical_converter

o In between line: 386, column: 17 and line: 395, column: 39 in file: fluids.isothermal_liquid.actuators.double_actuator

I dont know what to do i tried editing the parameters and i noticed that when i change my actuator area paramters from m^2 to cm^2 it works.

I have not used a relief valve.

Thanks in advance!

[Dyuman Joshi]

It would be helpful if you could share more details, particularly the P&ID diagram and related parameters.

[Walter Roberson]

It sounds as if your system is somehow running dry.

[Walter Roberson]

When you change your actuator area parameters from m^2 to cm^2 are you multiplying the corresponding constant value by 100?

,,, I do not see any actuator area parameter in what you have shown, unless it is the Cross-sectional area parameter ??

[Apostolos]

no i just change the unit

[Yifeng Tang]

Most likely a parametrization error or it's the way you actuates the cylinder (e.g. prescribing a motion). The error message says the rod (R end) has moved in the negative direction (towards C) so much that it now beyond the minimum point, leading to an unphysical volume. This usually happens when the hydraulic pressure isn't building up to support the external load, or the external load is prescribed in an unphysical way, e.g. as a velocity sources. It's hard to tell without seeing the model.