The determination of control system characteristics from a transient response

Measured values of the output of a control system are used to form a characteristic equation from which the overall transfer function may be found. To use the method it is necessary to know, or assume, the form of the transfer function, and also to have a knowledge of the input form. In this manner parameters of existing systems may be found either with a view to improving the system or providing data for future designs. A worked example indicates the possible order of accuracy.