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Step response model estimation

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Saraswathi S
Saraswathi S 2021-8-16
I have set of datas by solving ODE's using ODE 45 solver. My step input varies like this: [5.7,5.9.6.1,6.3,6.5,6.7] for the entire test process.(5.7 initial condition). Everytime I change the step input, I collect the output data until steady state is reached. My input and output is inversely proportional so a negative gain is expected from the process model. But im not getting such estimates. How exactly should I import input in this case and where could the probable mistake be.
For sample:
Output:160 158 157 156 154 153 152 151
Input:5.7 5.9 5.9 5.9 5.9 5.9 5.9 5.9
Time:0 5 10 15 20 25 30 35

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