Fourth-order systems may render very complex characteristic equation that are difficult for tuning. Is there any method to tune controllers for these systems easily?
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3Does your system have dominant poles? If so, you may be able to use tuning methods for second order or first order systems. – AJN Oct 31 '20 at 05:41
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What do you mean by "*accurately*" ? Usually the system may still work, even if the PI gains vary by a factor of 2. – AJN Oct 31 '20 at 09:20
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Thanks AJN... I will consider the correction... – Domino Nov 03 '20 at 08:56