Simscape Isothermal fluid simulation retunrs error on the cylinder component

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?

[Yifeng Tang]

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?