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I want to tune a PID controller for a heater with limit cycle. Supposed transfer function of the controlled object is not known. As it is
known, the describing function of the limit cycle is N=4h/¦Ð*a, where h is the height of limit cycle, and a is the swing of first order harmonic wave of the input of limit cycle. How to get the ¡®a¡¯? How to calculate the output of controller? How could I do the auto tuning experiment? Could you give me the experiment detail?
Thanks!
known, the describing function of the limit cycle is N=4h/¦Ð*a, where h is the height of limit cycle, and a is the swing of first order harmonic wave of the input of limit cycle. How to get the ¡®a¡¯? How to calculate the output of controller? How could I do the auto tuning experiment? Could you give me the experiment detail?
Thanks!