Abstract
The design of speed-regulating systems is discussed in relation to that of other closed-loop control systems. Frequency-response methods are found to form a common basis suitable for the analysis of all such systems. The derivation of transfer functions for linear and quasi-linear elements, together with their application to the analysis of regulating systems, is described, and a simplified gas-turbine governor is studied in greater detail. A summary of the latest work likely to be of importance to control engineers is given, together with extensive references, but it is argued that they can make the best use of the work of others in the field only when a common approach is adopted universally. It is therefore concluded that an elementary study of these methods should be included in the training of every engineering graduate.
