# Is it possible to reverse the operation, i.e., convert the mechanical force to the pressure and flow rate of the fluid using SimHydraulics 1.11 (R2012b)?

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If I want to reverse the operation, i.e., convert the mechanical force to the pressure and flow rate of the fluid, can this be modeled with SimHydraulics blocks ?
If I take “Double-Acting Hydraulic Cylinder” block as an example, port A,B can be used to control the movement of R.
But if I want to model such that there is a force on R, then to measure the flow rate and pressure on A and B, how can I do it with SimHydraulics blocks ?

MathWorks Support Team on 26 Feb 2015
With respect to your question about measuring Flow Rate and Pressure, when applying a force to the Hydraulic Cylinder, I have edited one of our DEMO models to demonstrate that it is possible.
As in hydraulics, whether the driving force is the change in pressure or the force to the piston, the hydraulic cylinder will move, similarly in SimHydraulics models, it does not matter whether the hydraulic circuit is driven by 'change of pressure' or 'force to the piston'.
I have used the following example from the Documentation :
Double-Acting Hydraulic Cylinder with Flexible Clamping
I edited the model (attached), and have removed the pressure sources. Also in the 'sh_cylinder_da_flexible_clamping_Edited/ForceSensor' subsystem have an Ideal force input (set to 400 N). The force sensor output has been commented. With this Ideal force as the only source of input, you will notice the change in flow rates across the two parts of the cylinder.
Hence, as mentioned above, it is possible to have drive the cylinder using a mechanical force and measure the flow rates/ pressure across the cylinders.
Peter Jesson on 14 Jan 2015
Hi, where can I find the attachment?
Kind Regards, Peter

Sriram Narayanan on 26 Feb 2015
Hi Peter, The article has been updated. Please find the attachment linked to the article.
Thanks,
Sriram

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