How to estimate transfer function of a plant when we have the outputs of step inputs?

How to estimate transfer function of a plant when we have the outputs of step inputs?

Answer 1

[Arkadiy Turevskiy]

You can use System Identification Toolbox, with tfest function.If you do not have access to this toolbox, you can try to do it (sort of) visually, if the system can be described by 1st or 2nd order transfer function - from visual inspection of step response you can get an idea of transfer function parameters.