Determine suitable control gain for the controller
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I am curious on how to determine the suitable Proportional-Derivative gain for my control system. I am referring to a quite complicated system for attitude control which not the simple closed loop transfer function with step input. How can I related the idea for tuning the gain for a simple system to my complicated attitude control system.
Well, this is a vague question...
To tune the gain you either need a model of your system and do some calculations, or if you do not have any model you can tune it experimentally.
You can start by reading this: