There are 3 gasses (LNG, NCC, H2) and these will be mixed in a mixing vessel. But first, there will be looked at the pressure change when there is a disruption placed somewhere in the system. There is an initial pressure of 25 bar, through a valve with a response time of 15 seconds (determine transfer function and tau), then through a pipe with a length of 10 meter and 6 inch diameter (determine transfer function and tau), this is for every gas separately, and the 3 gasses will go into 1 mixing vessel (determine transfer function and tau) and the output of this vessel is 1 pipe (determine transfer function and tau) to the scope with a pressure sensor (determine transfer function and tau) before that.
To summarize: For every gas an initial pressure, a valve with response time of 15 seconds, pipe with length and diameter. 3 gasses going into the mixing vessel, output 1 pipe with a length and diameter, and a pressure sensor. How is this made in Simulink and how are the transfer functions and tau values determined for every block? It would be nice to have references too to how the transfer functions and tau are determined.
When everything is known, the PI(D) blocks will be used to regulate the pressure in the system, using the Ziegler & Nichols method.
This is what I have made to far, the gain function of 0.4 0.4 0.2 is for how much percentage a valve is opened. The main problem is how to determine the transfer functions and tau values for every block.
After this, I also have to make the same system in Simscape (Simulink). To validate the models against each other.
