A quick method for estimating closed-loop poles of control systems

Present methods for evaluating closed-loop poles of feedback-control systems are often cumbersome and laborious when the order of the system increases beyond the third. For the purpose of saving the control engineers' time to a great extent, this paper presents a very quick method for estimating the closed-loop poles of feedback-control systems of any order. The results given by the method are approximate but have acceptable accuracy for all practical purposes. The method, as demonstrated in an example, forms the basis for a new system-synthesis technique.