How can I simulate a fixed orifice? (SimMechanics)

I am doing simulation of a Oleo pnuematic suspension for a mining truck.. I want to give flow and pressure (Hydraulic fluid) as input for the fixed orifice but i dont know how.. Also I want to do the simulation in similar way for the clearance between suspension and the piston.. Please help me..

[Walter Roberson]

Are you using MATLAB directly, or Simulink ? SimMechanics possibly ?

[Sujith Sundararajan]

Hi Walter

I am using SimMechanics.. I tried using the Hydraulic pressure source and Hydraulic flow source to provide the pressure and flow parameters but i am not sure if that is the right way to do.. I am not able to provide the exact flow and pressure properties. Since this is the first time i am using simulink, i am totally confused.. Which is the simplest method to provide the pressure and flow parameters at the inlet of fixed orifice??? My exact requirement is finding out the pressure drop and flow across the fixed orifice for various forces on the Hydraulic fluid..

[Walter Roberson]

Sorry I do not have experience with SimMechanics myself.

[Sujith Sundararajan]

Thank you Walter for your help!!!

Answer 1

[Guy Rouleau]

If this is correct: "My exact requirement is finding out the pressure drop and flow across the fixed orifice for various forces on the Hydraulic fluid."

Then connect a Pressure Sensor in parallel to the orifice and a Flow Sensor in series with the orifice.

You cannot specify both pressure and flow... those are complementary. With a source, you specify one and SimHydraulics computes the other.For example with a Flow Source, Simscape ensures that the specified flow is applied by generating whatever pressure to make that happen.

[Sujith Sundararajan]

Hi Guy

I appreciate your response.. I will definitely try the method you said.. One more thing is Do you why is it necessary to use the translational spring and damper at the R port of a single acting hydraulic cylinder???.. I am not sure about this..

Thanks