I have designed a control system for a based on the paddle displacement and I have been asked whether the controller would cause overshoot of force. I'm not sure whether it is possible to get the overshoot of force from the model because both the input and output of the system are displacement (x) rather than force (f). Any idea?
Hi Dr. Wang Kei Ma,
It's been 3 years since you last posted the question about the Fuzzy PID Control.
If you have designed & implemented the controller, and there is no external disturbance, then the answer is most likely a "Yes". Your controller caused the overshoot. Your input signal is probably the desired displacement.
The controller compares the input signal and the output signal to determine the error, which will be used to compute/produce the force that is needed to drive this error to zero. If you want to eliminate the overshoot, then you should design a controller that makes the closed-loop system behaves like a slightly over-damped system.
Overshoot is dependent on the control input which means the more the control input the more control effort is needed.
Why not make the input of your system Force rather than displacement. This can be done simply by designing a first, or second order ODE system. Then you have a control on the force value. If you use an Optimal Control approach then you can define also some lower and upper boundaries for your input (in this case force).
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