The robust control of a modern electropneumatic actuator

Describes, with the aid of both optimal regulator and sensitivity reduction methods, the design of a control scheme for an electropneumatic quarter-turn actuator which satisfies both the regulatory and the emergency slam shut/open requirements of the modern process application. The analysis begins by briefly considering the principal features which limit the performance of the commercially available actuator and suggests simple modifications to the conventional arrangement which may be employed to improve performance