how to control speed or velocity displacement hydraulic motor in simulink?

i have hydraulic system. i have problem how to make velocity displacement hydraulic motor to constant. because in my system, velocity is fluctuative like sine wave.

[Christiaan]

Dear Muhammad,

Please provide more information:

• Which simscape block are you using? (there is no "velocity displacement hydraulic motor" block)
• Is the application open or closed loop? (when closed loop then you can use a controller)
• Can you send us your model in the attachment (or at least a picture of it)

Kind regards, Christiaan