How can I simulate a Hydropnuematic suspension using simulink if the piston has a fixed orifice???

My exact requirement is to predict the deformation of the suspension for various loads.. The suspension which i am considering consists of gas and hydraulic oil. The piston has a fixed orifice through which the hydraulic oil flows under application of force. Due to the small orifice area flow, the cylinder can withstand huge amount of load and allows for a perfect piston movement.. Now I want to simulate the behavior of the fixed orifice by finding out the flow and pressure drop across it for various force or pressure input on the hydraulic damper..

Most of the simulink model i checked has a spring and dashpot, but in my case fixed orifice comes in place of dashpot and gas in place of spring. The concept is same but the situation is different. Is there any model in simulink which could be used to simulate the fixed orifice, suspension gas and finally finding out the deformation, pressure drop, and force due to fixed orifice????

Answer 1

[Yifeng Tang]

Something like this should work. Parameters and initial conditions will also be critical for the model to generate reasonable results.

The double-acting actuator block requires Simscape Fluids. You may also assemble one using two translational mechanical converter blocks. Here is an example: https://www.mathworks.com/help/releases/R2022a/physmod/simscape/ug/hydraulic-actuator-with-analog-position-controller-il.html