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Simscape Isothermal fluid simulation retunrs error on the cylinder component

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Flávio Luiz
Flávio Luiz 2024-5-28
评论： Yifeng Tang 2024-6-3
Hi All,
This is (should be) a simple hydraulic simulation of a circuit simulating a hydraulic pump, a block valve and 2 hydraulic cylinders in paralel.
When I add the cylinders to the simulation, the following error return:
An error occurred while running the simulation and the simulation was terminated
Caused by:
['Hitch_Backup/Solver Configuration']: Initial conditions solve failed to converge.
Nonlinear solver: Linear Algebra error. Failed to solve using iteration matrix.
all components and nodal across variables involved
Cannot solve for one or more variables, including dynamic variable derivatives:
Time derivative of 'CylLeft.p_I' (Pressure of liquid volume)
Time derivative of 'Ideal_Translational_Motion_Sensor.x' (Position)
Time derivative of 'Translational_Hard_Stop1.x' (Position)
'CylLeft.R.v' (Velocity)
'CylLeft.mdot_A' (Mass flow rate into port A)
'CylRight.R.v' (Velocity)
'CylRight.mdot_A' (Mass flow rate into port A)
'Ideal_Translational_Motion_Sensor.R.v' (Velocity)
'Ideal_Translational_Motion_Sensor.V' (V)
'Translational_Hard_Stop1.R.v' (Velocity)
'Translational_Hard_Stop1.v' (Velocity)
Not sure how to fix it. Any guess?
  1 个评论
Yifeng Tang
Yifeng Tang 2024-6-3
Haven't actually opened the model, but upon visual inspection, the piston end has no mass attached. F=m*a with m=0 usually won't work. Add a mass and give it a try?

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